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Breaking News

Winter Weather Advisory begins 8 p.m. tonight


Winter Weather Advisory begins 8 p.m. tonight
COURTESY NATIONAL WEATHER SERVICE


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National Weather Service
March 3, 2014, 5:32pm
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According to Meteorologist Paul Yura, the Austin-San Antonio National Weather Service Forecast Office has issued a Winter Weather Advisory for Gilliespie, Kerr, Blanco, Kendall, Hays, Comal, Bexar, Caldwell, Guadalupe, Wilson, Gonzales, Karnes, DeWitt, and Lavaca counties. A Winter Storm Warning is in effect for locations along and north of Texas Highway 71 (Llano, Burnet, Williamson, Travis, Bastrop, Lee, and Fayette counties). Both the advisory and the warning begin at 8 p.m. Monday, March 3 and expires Tuesday, March 4 at noon.

AREA OF CONCERN
The entire area along and north of Interstate 10, including Metro San Antonio, Austin, and including the coastal plains of Texas southeast of San Antonio. Special concern for areas along and north of Texas Highway 71 including Metro Austin. If Texas 71 or Interstate 10 pass through the county where your home, business, or jurisdiction is located, assume the entire county has the potential for winter weather tonight into Tuesday morning.

IMPACTS
Significant travel impacts are possible in the Winter Storm Warning area, including the possibility of ice accumulation on bridges, overpasses, and roads. Up to 1/10th of an inch of accumulation is possible. No major damage (e.g., tree or power line damage) is expected.

Across the Advisory area, light ice accumulation (trace amounts) are possible on bridges, flyovers, and some roads. Exposed surfaces where cold air can get underneath (e.g., cars, decks) may also see light icing. Some travel delays can be expected as some bridges/overpasses may be closed.

Thunderstorms may be possible overnight which could lead to isolated higher totals of ice and/or sleet. There is no threat for the Monday evening commute. There is a high likelihood of major impact on the Tuesday morning commute, thus the issuance of the advisories and warnings. There is no threat for the Tuesday evening commute.


TIMING
Precipitation is expected to start between 8 p.m. and midnight, reaching peak intensity from midnight through sunrise Tuesday, then taper off by mid-morning Tuesday. Main impact time will be from Midnight through 10 a.m. Temperatures will warm above freezing by noon Tuesday across most of the region, and melting of any ice on roads should be quick.

DISCUSSION
Another Arctic air mass is in place across South Central Texas. A disturbance coming from the Southwest U.S. will lift moist gulf air over the cold air and produce a combination of freezing rain and sleet across the area tonight and early Tuesday. Significant accumulation (up to 1/10th of an inch) of the freezing rain and sleet is expected along and north of Texas 71, including Metro Austin. Roads may be treacherous from midnight through noon Tuesday. All unnecessary travel in this Warning area should be delayed or cancelled overnight into Tuesday morning. Elsewhere across the I-10 Corridor, a light ice buildup may occur across the Advisory area, causing travel headaches and delays overnight into Tuesday as mainly bridges and overpasses get impacted.

Temperatures are expected to warm above freezing by noon across South Central Texas so any ice that does form will likely melt by the noon hour.

Our confidence that freezing temperatures will be in place is 100% across the Warning and Advisory area. Our confidence on the amount of precipitation is MODERATE to HIGH. South Central Texas needs to be ready to respond again to frozen precipitation. Again, the main impact will be on travel, with icing possible (Advisory area) and likely (Warning area), especially on bridges, flyovers, and lightly traveled roads.

For more information, visit www.weather.gov/austin.

Anyone with official information about weather-related closures, cancellations, or delayed openings is urged to comment below.
 


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