National Weather Service United States Department of Commerce

A Hard Freeze Warning is in effect for all of North and Central Texas tonight. This means very cold temperatures of 10 degrees or less are expected. Wind chill values are expected to range from -3 along the Red River to near 4 across Central Texas. Remember to protect people, pets, pipes, and plants from the extreme cold!
It will be mostly sunny and cold today with highs in the 30s. Winds will be northeasterly at 5 to 10 mph.
It will be cold again tonight with lows in the teens to lower 20s. East winds around 5 mph will become southerly overnight.
Warmer weather is on its way. As an arctic high pressure system moves east, temperatures will moderate. High temperatures will be mostly in the 40s Thursday, 50s to mid 60s Friday, and mid 60s east to mid 70s west Saturday. It will be slightly cooler Sunday through Tuesday. Highs will be in the 60s Sunday and upper 50s to mid 60s Monday and Tuesday. Lows will be in the teens to lower 20s Thursday morning, mid 20s to lower 30s Friday morning, 40s Saturday morning, 50s Sunday morning and 30s to around 40 Monday and Tuesday mornings.
With very cold temperatures forecast for North and Central Texas, be sure to dress in layers to stay warm!
It's a good time to remember "The 4 P's". Remember to turn off your sprinklers at night when temperatures are forecast to fall below freezing. Creating ice on sidewalks and roads can cause accidents, both on foot and in vehicles.
Wednesday's SKYWARN class will be in Palestine in Anderson County. The class will be held at the Courthouse Annex beginning at 6 pm. All SKYWARN classes are free and open to all ages. No registration is required.

 
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What is the WFO FWD Fire Weather Threat Index?

 

The National Weather Service (identifier FWD) in Fort Worth has developed an index to assess the fire weather threat across north Texas. The FWD Fire Weather Threat Index that you see on the WFO Fort Worth fire weather pages is a locally-developed scaled value derived from relative humidity, wind speed, and fuel factor.

The values of the index range from 1 (minimal threat) to 100 (highest threat). Theoretically, values should be near  1 when winds are light, relative humidities are over 90%, and fine fuels (typically grasses) are either green or moist from recent rains. 

On the other extreme, values should be near 100 (highest threat) during dry periods in the fall and winter when sustained winds are at least 20 mph and relative humidity values are less than 35%. Recent rainfall and/or substantial green vegetation could make the FWD Fire Threat Index much lower, even with low humidities and strong winds.

Fire Weather Threat Values of FWD Fire Weather Threat Index

LOW
 0-20

MODERATE
 21-40

HIGH 
41-60

VERY HIGH
 61-80

EXTREME
 81-100

Graphic showing Fire Index as a function of wind speed and humidity.