Wind Chill Advisory(NPW, WWUS74)
Definition
Wind chill is a measure of how cold the air "feels" on the body when the wind is taken in consideration. As the wind increases, heat is removed from a body at an accelerated rate, driving down the body temperature. The wind chill index is the approximate temperature it "feels" to the body if the wind was calm. (Jump to the Wind Chill Chart.) It is headlined URGENT - WINTER WEATHER MESSAGE and is issued as a Non-Preciptiation Weather Advisory (NPW).
Example
FTWNPWFTW
TTAAOO KFTW 150730
TXZO91>095-101>107-115>122-160000-
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE FORT WORTH TX
130 AM CST WED DEC 15 1999
...AN ADVISORY FOR DANGEROUS WIND CHILL IS IN EFFECT FOR NORTH TEXAS
TODAY...
EXTREMELY COLD TEMPERATURES AND STRONG WINDS WILL PRODUCE DANGEROUS
WIND CHILLS ACROSS NORTH TEXAS TODAY. ARCTIC AIR STORMED INTO THE
REGION LAST NIGHT AND TEMPERATURES WILL CONTINUE FALLING THROUGH
THE DAY. TEMPERATURES IN THE LOWER 20S THIS AFTERNOON WITH WINDS
GUSTING TO AROUND 35 MILES AN HOUR WILL CAUSE WIND CHILLS NEAR 20
DEGREES BELOW ZERO.
THIS IS A POTENTIALLY DANGEROUS SITUATION FOR ANYONE OUTSIDE AND NOT
PREPARED. IF YOU MUST BE OUTDOORS...BE CAREFUL TO COVER ALL EXPOSED
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