The National Weather Service in Brownsville has upgraded much of the Rio Grande Valley to a WINTER STORM WARNING until 11 AM on Wednesday. This is based on trends suggesting accumulations of freezing rain along with sleet will be more significant than previously thought. Ice accumulations of up to a quarter of an inch along with sleet accumulations up to one inch will be possible in the warning area. This is a rare, possibly historic event for the RGV considering that winter weather is nearly unheard of. Travel issues are probable this morning and should be avoided until this event passes. A Winter Weather Advisory is in effect just north of the warning area. As colder air drifts into the region some areas may switch over to all snow and receive snow accumulations over 1 inch.
..WINTER STORM WARNING IN EFFECT UNTIL 8 AM CST WEDNESDAY…
…WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 11 AM CST
THE NATIONAL WEATHER SERVICE IN BROWNSVILLE HAS ISSUED A WINTER
STORM WARNING FOR FREEZING RAIN AND SLEET…WHICH IS IN EFFECT
UNTIL 8 AM CST WEDNESDAY. THE WINTER WEATHER ADVISORY IS NO
LONGER IN EFFECT.
* EVENT…STRONG COLD ARCTIC AIR BRINGING BELOW FREEZING
TEMPERATURES TONIGHT IN COMBINATION WITH A DISTURBANCE OVER
MEXICO WILL DEVELOP THE POTENTIAL FOR A MIX OF FREEZING RAIN AND
SLEET ACROSS DEEP SOUTH TEXAS. ICE ACCRETION OVER ONE EIGHT OF
AN INCH AND SLEET ACCUMULATION TO ONE HALF TO THREE QUARTERS OF
AN INCH ARE EXPECTED.
* WIND CHILL VALUES…23 TO 26 ACROSS THE RIO GRANDE RANCH LANDS
AND 25 TO 28 ACROSS THE RIO GRANDE VALLEY.
* TIMING…NOW THROUGH EARLY WEDNESDAY MORNING.
* IMPACT…TRAVEL IN MANY AREAS ACROSS THE RIO GRANDE VALLEY WILL
BE SIGNFICANTLY IMPACTED…ESPECIALLY ON BRIDGES AND OVERPASSES
WITH SLICK SPOTS FORMING. HYPOTHERMIA COULD DEVELOP QUICKLY IN
PERSONS AND ANIMALS THAT ARE WITHOUT ADEQUATE SHELTER. THOSE
OUTDOORS FOR EXTENDED PERIODS OF TIME SHOULD BE ADEQUATELY
DRESSED IN MULTIPLE LAYERS.
A WINTER STORM WARNING IS ISSUED WHEN DANGEROUS WINTER WEATHER IS
IMMINENT. SNOW ACCUMULATIONS OF AT LEAST ONE INCH ON ROADS OR
WALKWAYS…AT LEAST ONE HALF INCH OF SLEET ACCUMULATION…OR ICE
ACCRETION OF ONE EIGHTH INCH OR MORE ON EXPOSED SURFACES.
HAZARDOUS DRIVING CONDITIONS WILL RESULT. PERSONS WITH TRAVEL
PLANS IN THE WARNING AREA ARE STRONGLY ENCOURAGED TO POSTPONE
THEM UNTIL CONDITIONS IMPROVE.
A WIND CHILL ADVISORY IS ISSUED WHEN WIND CHILL INDEX VALUES WILL
DROP TO 30 OR LOWER FOR AT LEAST 2 HOURS FOR THE RIO GRANDE
VALLEY AND 25 DEGREES OR LOWER FOR 2 OR MORE HOURS FOR THE RIO
GRANDE PLAINS AND NORTHERN RANCHLANDS…WITH WINDS OF 10 MPH OR