Weather Alert in Texas
Red Flag Warning issued March 11 at 7:59PM CDT until March 11 at 11:00PM CDT by NWS Brownsville TX
AREAS AFFECTED: Zapata; Jim Hogg; Starr
DESCRIPTION: ...ELEVATED TO CRITICAL FIRE WEATHER RISK THIS EVENING AND THURSDAY... .A precipitous drop off in relative humidity (RH) values following the passage of a dryline on top of breezy northwest winds have led to a critical threat for fire weather over Deep South Texas this afternoon. The combination of low RH values ranging between 15-30%, an ongoing drought ranging from D2 (Severe Drought) to D4 (Exceptional Drought), and breezy northwest winds 10-20 mph gusting as high as 30 mph has resulted in a critical fire weather risk into this evening across all of Deep South Texas, excluding the island. Continued low RH values and breezy conditions could result in another day of elevated to critical fire weather conditions on Thursday. * WINDS...10-20 mph gusting as high as 30 mph. * RELATIVE HUMIDITY...As low as 15-30 percent. * TEMPERATURES...Mid to upper 90s. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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