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43 Cards in this Set

  • Front
  • Back
estimation of conditions at locale or time based on surrounding weather
creation of electrical charge in object by proximity of another previously charged object
global-scale, thermal circulation feature of trade winds carrying air from subtropical high pressure belt to ITCZ
Hadley cell
stability measure indicating probability of convective activity like storms at locale


difference in temperature of lifted air parcel and environment at 500 mb level
lifted index
fluid flow that is smooth and nonturbulent, progressing in parallel lines or sheets
laminar flow
smallest scale of atmospheric phenomena

-features of molecular size
-lifespan fraction of a second
molecular scale
synoptic or global scale oceanic circulation cell, associated with High pressure cell
positive electrical current in lightning, ground to cloud carrying main flow of electricity along the stepped leader's channel
return stroke
tropical cyclone
-winds= 20-34 knots or 23-39 mph
tropical depression
rise of sea surface along path of storm by circulating winds and low pressure at center of storm
storm surge
warning of unusual or potentially harmful weather
special weather statement
largest of atmospheric phenomena
-1000 km
global scale
turbulence caused by obstruction of wind flow by buildings, trees, mountains, and so forth
mechanical turbulence
"ordinary" - forms individually from local heating and not by fronts or orography
airmass thunderstorm
1st phase of lightning, flood of electrons travel earthward in a series of segments
stepped leader
violently rotating column of air that extends from the base of a severe thunderstorm
dark, slowly rotating cloud extending below the mesocyclone circulation in a potentially tornado-producing thunderstorm
wall cloud
visible vortex of rapidly circulating air extending downward from a severe thunderstorm
funnel cloud
any member of hurricane family whatever its location or strength

-tropical storm
tropical cyclone
a tropical cyclone of hurricane intensity in Western Pacific
ring of towering thunderstorm clouds at eye of hurricane
eye wall
severe tropical cyclone
-500 km (300 mi) diameter
-64 knots (74 mph) winds

over warm ocean in maritime tropical air
tornado occuring over water, more common and less intense than land tornado
electrical discharge within a cloud, cloud to ground, cloud to cloud, flash is stepped leader and series of return strokes
3-7 day forecast
extended forecast
48 hour forecast
short-term forecast
2-3 hour forecast
now cast
study of long-term weather patterns in a region
conditions plugged into equations of atmospheric motion or wave forms to get forecast
numerical forecasting
forecasting technique based on fiction that upper level wind flow "steers" surface patterns
forecasting strategy supposing that weather will remain unchanged
persistence forecasting
changes in weather over a 24 hour period
diurnal cycles
turbulence caused by obstruction of air flow by conductive air motions
thermal turbulence
output from several computer models blended to produce a single forecast
consensus forecast
fluid flow with complex patterns that change rapidly over time
ITCZ, or light, variable winds within ITCZ

intertropical convergence zone
convergent, rotating convection currents; hot air rises, air below swirls to replace it
dust devil
microscale turbulence at high altitudes without clouds
clear air turbulence (CAT)
synoptic scale, westward moving, wave shaped disturbance embedded in a tropical trade wind
Easterly wave
seasonal, thermal circulation caused by temperature contrasts from ocean to continent

winds inland in summer, off land in winter
global-scale band of NE or SE winds in low latitudes of 5-30 degrees
trade winds
forecasting strategy supposing fronts, etc will persist and move predictably as in the past
trend forecasting
electric spark or flow of electrically charged particles between oppositely charge objects
electric discharge