Frontal Passage - the movement of a front across an area; characterized by changes in temperature, and, generally in pressure, wind direction and speed, visibility, cloudiness and precipitation ...
frontal passage - (Acronym fropa.) The passage of a front over a point on the earth's surface; or, the transit of an aircraft through a frontal zone.
FRONTAL PASSAGE
It is the passage of a front over a specific point on the surface. It is reflected by the change in dew point and temperature, the shift in wind direction, and the change in atmospheric pressure.
FROPA- FROntal PAssage
FWC- Forecasted Weather Conditions; MOS output from NGM model
FZRA / ZR- Freezing Rain ...
FROPA- Frontal Passage
FROST - The formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans. Frost develops under conditions similar to dew, except the temperatures are colder.
the passage of a warm front, the temperature and humidity increase, the pressure rises, and although the wind shifts (usually from the southwest to the northwest in the Northern Hemisphere), it is not as pronounced as with a cold frontal passage.
FROPA: Contraction in a weather observation for "Frontal Passage". Frost: Formed when the temperature is below freezing by sublimation. Frost Advisory: An advisory issued by the National Weather Service when the formation of frost is expected.
Another indication of a possible frontal passage is a change in the air's relative humidity. The air mass ahead of a cold front is typically more moist than the air mass behind it.
So, a wind observation might be SSE/4 gusts 5; or, upon a cold frontal passage, SSE/3-4 becoming SW ocnl W 3 gusting 4 or 5.
Reports of temperature should be in degrees C. Don't try for 1/10's degree accuracy unless the thermometer allows it.
BLUE NORTHER Refers to a swift-moving cold frontal passage in the southern Great Plains, marked by a dark, blue-black sky with strong wintery winds from the northwest or north and temperatures that may drop 20°F to 30 ...
They may not last terribly long, as the drier air which usually follows a frontal passage mixes with them until they thin out and disappear.
colder airmass which separates two air masses in which the gradients of temperature and moisture are maximized. In the northern hemisphere winds ahead of the front will be typically southwest and shift into the northwest with frontal passage.
FROPAFrontal PassageFROSFCFrontal SurfaceFrost(Abbrev. FRST) - Frost describes the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans.
 See also: Front, Air, Surface, Air mass, Wind
  
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