Glossay, Terms and definitions for storm spotters.
Severe weather definitions here.
NOAA Technical Memorandum NWS SR-145 Michael Branick
The information below is from NOAA's NWS Glossary and is their expertise and work that has
made this section available. It is provided here to give you accurate and professional
(I-R) Glossary (A-B) Glossary (C-H) Glossary (I-R) Glossary (S-Z)
Impulse - See upper level system.
Inflow Bands (or Feeder Bands) - Bands of low clouds, arranged parallel to the low-level
winds and moving into or toward a thunderstorm. They may indicate the strength of the
inflow of moist air into the storm, and, hence, its potential severity. Spotters should be
especially wary of inflow bands that are curved in a manner suggesting cyclonic rotation;
this pattern may indicate the presence of a mesocyclone.
Inflow Jets - Local jets of air near the ground flowing inward toward the base of a
Inflow Notch - A radar signature characterized by an indentation in the reflectivity
pattern on the inflow side of the storm. The indentation often is V-shaped, but this term
should not be confused with V-notch. Supercell thunderstorms often exhibit inflow notches,
usually in the right quadrant of a classic supercell, but sometimes in the eastern part of
an HP storm or in the rear part of a storm (rear inflow notch).
Inflow Stinger - A beaver tail cloud with a stinger-like shape.
Insolation - Incoming solar radiation. Solar heating; sunshine.
Instability - The tendency for air parcels to accelerate when they
are displaced from their original position; especially, the tendency
to accelerate upward after being lifted. Instability is a
prerequisite for severe weather - the greater the instability, the
greater the potential for severe thunderstorms.
Inversion - Generally, a departure from the usual increase or
decrease in an atmospheric property with altitude. Specifically it
almost always refers to a temperature inversion, i.e., an increase
in temperature with height, or to the layer within which such an
increase occurs. An inversion is present in the lower part of a cap.
Isentropic Lift - Lifting of air that is traveling along an upward-sloping isentropic
Isentropic lift often is referred to erroneously as overrunning, but more accurately
describes the physical process by which the lifting occurs. Situations involving
isentropic lift often are characterized by widespread stratiform clouds and precipitation,
but may include elevated convection in the form of embedded thunderstorms.
Isentropic Surface - A two-dimensional surface containing points of equal potential
Isobar - A line connecting points of equal pressure.
Isodrosotherm - A line connecting points of equal dew point temperature.
Isohyet - A line connecting points of equal precipitation amounts.
Isopleth - General term for a line connecting points of equal value of some quantity.
Isobars, isotherms, etc. all are examples of isopleths.
Isotach - A line connecting points of equal wind speed.
Isotherm - A line connecting points of equal temperature.
Jet Max (or Speed Max, Jet Streak) - a point or area of relative maximum wind speeds
within a jet stream.
Jet Streak - A local wind speed maximum within a jet stream.
Jet Stream - Relatively strong winds concentrated in a narrow stream in the atmosphere,
normally referring to horizontal, high-altitude winds. The position and orientation of jet
streams vary from day to day. General weather patterns (hot/cold, wet/dry) are related
closely to the position, strength and orientation of the jet stream (or jet streams). A
jet stream at low levels is known as a low-level jet.
Knuckles - [Slang], lumpy protrusions on the edges, and sometimes the underside, of a
thunderstorm anvil. They usually appear on the upwind side of a back-sheared anvil, and
indicate rapid expansion of the anvil due to the presence of a very strong updraft. They
are not mammatus clouds. See also cumuliform anvil, anvil rollover.
Laminar - Smooth, non-turbulent. Often used to describe cloud formations which appear to
be shaped by a smooth flow of air traveling in parallel layers or sheets.
Landspout - [Slang], a tornado that does not arise from organized storm-scale rotation and
therefore is not associated with a wall cloud (visually) or a mesocyclone (on radar).
Landspouts typically are observed beneath Cbs or towering cumulus clouds (often as no more
than a dust whirl), and essentially are the land-based equivalents of waterspouts.
Lapse Rate - The rate of change of an atmospheric variable, usually temperature, with
height. A steep lapse rate implies a rapid decrease in temperature with height (a sign of
instability) and a steepening lapse rate implies that destabilization is occurring.
Large-scale - See synoptic-scale.
Left Front Quadrant (or Left Exit Region) - The area downstream from and to the left of an
upper-level jet max (as would be viewed looking along the direction of flow). Upward
motion and severe thunderstorm potential sometimes are increased in this area relative to
the wind speed maximum. See also entrance region, right rear quadrant.
Left Mover - A thunderstorm which moves to the left relative to the steering winds, and to
other nearby thunderstorms; often the northern part of a splitting storm. See also right
LEWP - Line Echo Wave Pattern. A bulge in a thunderstorm line producing a wave-shaped
"kink" in the line. The potential for strong outflow and damaging
straight-line winds increases near the bulge, which often resembles a bow echo. Severe
weather potential also is increased with storms near the crest of a LEWP.
Lifted Index (or LI) - A common measure of atmospheric instability.
Its value is obtained by computing the temperature that air near the
ground would have if it were lifted to some higher level (around
18,000 feet, usually) and comparing that temperature to the actual
temperature at that level. Negative values indicate instability -
the more negative, the more unstable the air is, and the stronger
the updrafts are likely to be with any developing thunderstorms.
However there are no "magic numbers" or threshold LI values below
which severe weather becomes imminent.
Loaded Gun (Sounding) - [Slang], a sounding characterized by extreme
instability but containing a cap, such that explosive thunderstorm
development can be expected if the cap can be weakened or the air
below it heated sufficiently to overcome it.
Longwave Trough - A trough in the prevailing westerly flow aloft which is characterized by
large length and (usually) long duration. Generally, there are no more than about five
longwave troughs around the Northern Hemisphere at any given time. Their position and
intensity govern general weather patterns (e.g., hot/cold, wet/dry) over periods of days,
weeks, or months. Smaller disturbances (e.g., shortwave troughs) typically move more
rapidly through the broader flow of a longwave trough, producing weather changes over
shorter time periods (a day or less).
Low-level Jet (abbrev. LLJ) - A region of relatively strong winds in the lower part of the
atmosphere. Specifically, it often refers to a southerly wind maximum in the boundary
layer, common over the Plains states at night during the warm season (spring and summer).
The term also may be used to describe a narrow zone of strong winds above the boundary
layer, but in this sense the more proper term would be low-level jet stream.
LP Storm (or LP Supercell) - Low-Precipitation storm (or Low-Precipitation supercell). A
supercell thunderstorm characterized by a relative lack of visible precipitation. Visually
similar to a classic supercell, except without the heavy precipitation core. LP
storms often exhibit a striking visual appearance; the main tower often is bell-shaped,
with a corkscrew appearance suggesting rotation. They are capable of producing tornadoes
and very large hail. Radar identification often is difficult relative to other types of supercells, so visual reports are very important. LP storms almost always occur on or near
the dry line, and thus are sometimes referred to as dry line storms.
LSR - Local Storm Report. A product issued by local NWS offices to inform users of reports
of severe and/or significant weather-related events.
Mammatus Clouds - Rounded, smooth, sack-like protrusions hanging from the underside of a
cloud (usually a thunderstorm anvil). Mammatus clouds often
accompany severe thunderstorms, but do not produce severe weather;
they may accompany non-severe storms as well.
MCC - Mesoscale Convective Complex. A large MCS, generally round or oval-shaped, which
normally reaches peak intensity at night. The formal definition includes specific minimum
criteria for size, duration, and eccentricity (i.e., "roundness"), based on the
cloud shield as seen on infrared satellite photographs:
Size: Area of cloud top -32 degrees C or less: 100,000 square kilometers or more (slightly
smaller than the state of Ohio), and area of cloud top -52 degrees C or less: 50,000
square kilometers or more.
Duration: Size criteria must be met for at least 6 hours.
Eccentricity: Minor/major axis at least 0.7.
MCCs typically form during the afternoon and evening in the form of several isolated
thunderstorms, during which time the potential for severe weather is greatest. During peak
intensity, the primary threat shifts toward heavy rain and flooding.
MCS - Mesoscale Convective System. A complex of thunderstorms which becomes organized on a
scale larger than the individual thunderstorms, and normally persists for several hours or
more. MCSs may be round or linear in shape, and include systems such as tropical cyclones,
squall lines, and MCCs (among others). MCS often is used to describe a cluster of
thunderstorms that does not satisfy the size, shape, or duration criteria of an MCC.
Medium Range - In forecasting, (generally) three to seven days in advance.
Meridional Flow - Large-scale atmospheric flow in which the north-south component (i.e.,
longitudinal, or along a meridian) is pronounced. The accompanying zonal (east-west)
component often is weaker than normal. Compare with zonal flow.
*Mesocyclone - A storm-scale region of rotation, typically around 2-6 miles in diameter
and often found in the right rear flank of a supercell (or often on the eastern, or front,
flank of an HP storm). The circulation of a mesocyclone covers an area much larger than
the tornado that may develop within it.
Properly used, mesocyclone is a radar term; it is defined as a rotation signature
appearing on Doppler radar that meets specific criteria for magnitude, vertical depth, and
duration. Therefore, a mesocyclone should not be considered a visually-observable
phenomenon (although visual evidence of rotation, such as curved inflow bands, may imply
the presence of a mesocyclone).
Mesohigh - A mesoscale high pressure area, usually associated with MCSs or their remnants.
Mesolow (or Sub-synoptic Low) - A mesoscale low-pressure center. Severe weather potential
often increases in the area near and just ahead of a mesolow.
Mesolow should not be confused with mesocyclone, which is a storm-scale phenomenon.
Mesonet - A regional network of observing stations (usually surface stations) designed to
diagnose mesoscale weather features and their associated processes.
Mesoscale - Size scale referring to weather systems smaller than synoptic-scale systems
but larger than storm-scale systems. Horizontal dimensions generally range from around 50
miles to several hundred miles. Squall lines, MCCs, and MCSs are examples of mesoscale
*Microburst - A small, concentrated downburst affecting an area less than 4 kilometers
(about 2.5 miles) across. Most microbursts are rather short-lived (5 minutes or so), but
on rare occasions they have been known to last up to 6 times that long.
Mid-level Cooling - Local cooling of the air in middle levels of the atmosphere (roughly 8
to 25 thousand feet), which can lead to destabilization of the entire atmosphere if all
other factors are equal. Mid-level cooling can occur, for example, with the approach of a
mid-level cold pool.
Moderate Risk (of severe thunderstorms) - Severe thunderstorms are expected to affect
between 5 and 10 percent of the area. A moderate risk indicates the possibility of a
significant severe weather episode. See high risk, slight risk, convective outlook.
Moisture Advection - Transport of moisture by horizontal winds.
Moisture Convergence - A measure of the degree to which moist air is converging into a
given area, taking into account the effect of converging winds and moisture advection.
Areas of persistent moisture convergence are favored regions for thunderstorm development,
if other factors (e.g., instability) are favorable.
Morning Glory - An elongated cloud band, visually similar to a roll cloud, usually
appearing in the morning hours, when the atmosphere is relatively stable. Morning glories
result from perturbations related to gravitational waves in a stable boundary layer. They
are similar to ripples on a water surface; several parallel morning glories often can be
seen propagating in the same direction.
MRF - Medium-Range Forecast model; one of the operational forecast models run at NCEP. The
MRF is run once daily, with forecast output out to 240 hours (10 days).
Multi-cell(ular) Thunderstorm - A thunderstorm consisting of two or more cells, of which
most or all are often visible at a given time as distinct domes or towers in various
stages of development.
Nearly all thunderstorms (including supercells) are multi-cellular, but the term often is
used to describe a storm which does not fit the definition of a supercell.
*Multiple-vortex (or Multi-vortex) Tornado - a tornado in which two or more condensation
funnels or debris clouds are present at the same time, often rotating about a common
center or about each other. Multiple-vortex tornadoes can be especially damaging. See
Mushroom - [Slang], a thunderstorm with a well-defined anvil rollover, and thus having a
visual appearance resembling a mushroom.
NCEP - National Centers for Environmental Prediction; the modernized version of NMC.
Negative-tilt Trough - An upper level system which is tilted to the west with increasing
latitude (i.e., with an axis from southeast to northwest). A negative-tilt trough often is
a sign of a developing or intensifying system.
NEXRAD - NEXt-Generation Weather RADar. Technologically-advanced weather radar being
deployed to replace WSR-57 and WSR-74 units. NEXRAD is a high-resolution Doppler radar
with increased emphasis on automation, including use of algorithms and automated volume
scans. NEXRAD units are known as WSR-88D.
NGM - Nested Grid Model; one of the operational forecast models run at NCEP. The NGM is
run twice daily, with forecast output out to 48 hours.
NMC - National Meteorological Center, with headquarters near Washington D.C.; now known as
NOAA - National Oceanographic and Atmospheric Administration.
Nocturnal - Related to nighttime, or occurring at night.
Nowcast - A short-term weather forecast, generally out to six hours or less.
NSSFC - National Severe Storms Forecast Center, in Kansas City MO; now known as SPC.
NSSL - National Severe Storms Laboratory, in Norman OK. (Sometimes pronounced NES-sel.)
NWP - Numerical Weather Prediction.
NWS - National Weather Service.
Occluded Mesocyclone - A mesocyclone in which air from the rear-flank downdraft has
completely enveloped the circulation at low levels, cutting off the inflow of warm
unstable low-level air.
Orographic - Related to, or caused by, physical geography (such as mountains or sloping
Orographic Lift - Lifting of air caused by its passage up and over mountains or other
Orphan Anvil - [Slang], an anvil from a dissipated thunderstorm, below which no other
Outflow Boundary - A storm-scale or mesoscale boundary separating thunderstorm-cooled air
(outflow) from the surrounding air; similar in effect to a cold front, with passage marked
by a wind shift and usually a drop in temperature. Outflow boundaries may persist for 24
hours or more after the thunderstorms that generated them dissipate, and may travel
hundreds of miles from their area of origin. New thunderstorms often develop along outflow
boundaries, especially near the point of intersection with another boundary (cold front,
dry line, another outflow boundary, etc.; see triple point).
Overhang - Radar term indicating a region of high reflectivity at middle and upper levels
above an area of weak reflectivity at low levels. (The latter area is known as a weak-echo
region, or WER.) The overhang is found on the inflow side of a
thunderstorm (normally the south or southeast side).
Overrunning - A weather pattern in which a relatively warm air mass is in motion above
another air mass of greater density at the surface. Embedded thunderstorms sometimes
develop in such a pattern; severe thunderstorms (mainly with large hail) can occur, but
tornadoes are unlikely.
Overrunning often is applied to the case of warm air riding up over a retreating layer of
colder air, as along the sloping surface of a warm front. Such use of the term technically
is incorrect, but in general it refers to a pattern characterized by widespread clouds and
steady precipitation on the cool side of a front or other boundary.
*Overshooting Top (or Penetrating Top) - A dome-like protrusion above a thunderstorm
anvil, representing a very strong updraft and hence a higher potential for severe weather
with that storm. A persistent and/or large overshooting top (anvil dome) often is present
on a supercell. A short-lived overshooting top, or one that forms
and dissipates in cycles, may indicate the presence of a pulse storm
or a cyclic storm.
PDS Watch - [Slang], a tornado watch with enhanced wording (Particularly Dangerous
Pendant Echo - Radar signature generally similar to a hook echo, except that the hook
shape is not as well defined.
Penetrating Top - Same as overshooting top.
Popcorn Convection - [Slang], Showers and thunderstorms that form on a scattered basis
with little or no apparent organization, usually during the afternoon in response to
diurnal heating. Individual thunderstorms typically are of the type sometimes referred to
as air-mass thunderstorms: they are small, short-lived, very rarely severe, and they
almost always dissipate near or just after sunset.
Positive Area - The area on a sounding representing the layer in which a lifted parcel
would be warmer than the environment; thus, the area between the environmental temperature
profile and the path of the lifted parcel. Positive area is a
measure of the energy available for convection; see CAPE or our
CAPE classroom study.
Positive CG - A CG flash that delivers positive charge to the ground, as opposed to the
more common negative charge. Positive CGs have been found to occur more frequently in some
severe thunderstorms. Their occurrence is detectable by most lightning detection networks,
but visually it is not considered possible to distinguish between a positive CG and a
negative CG. (Some claim to have observed a relationship between staccato lightning and
positive CGs, but this relationship is as yet unproven.)
Positive-tilt Trough - An upper level system which is tilted to the east with increasing
latitude (i.e., from southwest to northeast). A positive-tilt trough often is a sign of a
weakening weather system, and generally is less likely to result in severe weather than a
negative-tilt trough if all other factors are equal.
Potential Temperature - The temperature a parcel of dry air would have if brought
adiabatically (i.e., without transfer of heat or mass) to a standard pressure level of
PPINE - Plan Position Indicates No Echoes, referring to the fact that a radar detects no
precipitation within its range.
Profiler - An instrument designed to measure horizontal winds directly above its location,
and thus measure the vertical wind profile. Profilers operate on the same principles as
Pseudo-Cold Front - A boundary between a supercell's inflow region and the rear-flank
downdraft (or RFD). It extends outward from the mesocyclone center, usually toward the
south or southwest (but occasionally bows outward to the east or southeast in the case of
an occluded mesocyclone), and is characterized by advancing of the downdraft air toward
the inflow region. It is a particular form of gust front. See also pseudo-warm front.
Pseudo-Warm Front - A boundary between a supercell's inflow region and the forward-flank
downdraft (or FFD). It extends outward from at or near the mesocyclone center, usually
toward the east or southeast, and normally is either nearly stationary or moves northward
or northeastward ahead of the mesocyclone. See pseudo-cold front and beaver tail.
Pulse Storm - A thunderstorm within which a brief period (pulse) of strong updraft occurs,
during and immediately after which the storm produces a short episode of severe weather.
These storms generally are not tornado producers, but often produce large hail and/or
damaging winds. See overshooting top, cyclic storm.
PVA - Positive Vorticity Advection. Advection of higher values of vorticity into an area,
which often is associated with upward motion (lifting) of the air. PVA typically is found
in advance of disturbances aloft (i.e., shortwaves), and is a property which often
enhances the potential for thunderstorm development.
RADAP II - RAdar DAta Processor II, attached to some WSR-57 and WSR-74 radar units. It
automatically controls the tilt sequence and computes several radar-derived quantities at
regular intervals, including VIL, storm tops, accumulated rainfall, etc.
Radial Velocity - Component of motion toward or away from a given location. As
"seen" by Doppler radar, it is the component of motion parallel to the radar
beam. (The component of motion perpendicular to the beam cannot be seen by the radar.
Therefore, strong winds blowing strictly from left to right or from right to left,
relative to the radar, can not be detected.)
Rain Foot - [Slang], a horizontal bulging near the surface in a precipitation shaft,
forming a foot-shaped prominence. It is a visual indication of a wet microburst.
*Rain-free Base - A dark, horizontal cloud base with no visible precipitation beneath it.
It typically marks the location of the thunderstorm updraft. Tornadoes may develop from
wall clouds attached to the rain-free base, or from the rain-free base itself - especially
when the rain-free base is on the south or southwest side of the main precipitation area.
Note that the rain-free base may not actually be rain free; hail or
large rain drops may be falling. For this reason, updraft base is
Rear Flank Downdraft (or RFD) - A region of dry air subsiding on the back side of, and
wrapping around, a mesocyclone. It often is visible as a clear slot
wrapping around the wall cloud. Scattered large precipitation
particles (rain and hail) at the interface between the clear slot
and wall cloud may show up on radar as a hook or pendant; thus the
presence of a hook or pendant may indicate the presence of an RFD.
Red Watch or Red Box - [Slang], a tornado watch.
Reflectivity - Radar term referring to the ability of a radar target to return energy;
used to derive echo intensity, and to estimate precipitation intensity and rainfall rates.
See dBZ, VIP.
Relative Humidity - A dimensionless ratio, expressed in percent, of the amount of
atmospheric moisture present relative to the amount that would be present if the air were
saturated. Since the latter amount is dependent on temperature, relative humidity is a
function of both moisture content and temperature. As such, relative humidity by itself
does not directly indicate the actual amount of atmospheric moisture present. See dew
Retrogression (or Retrograde Motion) - Movement of a weather system in a direction
opposite to that of the basic flow in which it is embedded, usually referring to a closed
low or a longwave trough which moves westward.
Return Flow - South winds on the back (west) side of an eastward-moving surface high
pressure system. Return flow over the central and eastern United States typically results
in a return of moist air from the Gulf of Mexico (or the Atlantic Ocean).
Right Entrance Region (or Right Rear Quadrant) - The area upstream from and to the right
of an upper-level jet max (as would be viewed looking along the direction of flow). Upward
motion and severe thunderstorm potential sometimes are increased in this area relative to
the wind speed maximum. See also exit region, left front quadrant.
Ridge - An elongated area of relatively high atmospheric pressure; the opposite of trough.
*Right Mover - A thunderstorm that moves appreciably to the right relative to the main
steering winds and to other nearby thunderstorms. Right movers typically are associated
with a high potential for severe weather. (Supercells often are right movers.) See left
mover, splitting storm.
Right Rear Quadrant - see Right Entrance Region.
*Roll Cloud - A low, horizontal tube-shaped arcus cloud associated with a thunderstorm
gust front (or sometimes with a cold front). Roll clouds are relatively rare; they are
completely detached from the thunderstorm base or other cloud features, thus
differentiating them from the more familiar shelf clouds. Roll clouds usually appear to be
"rolling" about a horizontal axis, but should not be confused with funnel
*Rope (or Rope Funnel) - A narrow, often contorted condensation funnel usually associated
with the decaying stage of a tornado. See rope stage.
Rope Cloud - In satellite meteorology, a narrow, rope-like band of clouds sometimes seen
on satellite images along a front or other boundary.
The term sometimes is used synonymously with rope or rope funnel.
Rope Stage - The dissipating stage of a tornado, characterized by thinning and shrinking
of the condensation funnel into a rope (or rope funnel). Damage still is possible during
RUC - Rapid Update Cycle, a numerical model run at NCEP that focuses on short-term (up to
12 h) forecasts and small-scale (mesoscale) weather features. Forecasts are prepared every
3 hours for the contiguous United States.
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