February 2021 Historical Winter Storm Event South …

1 Austin/San Antonio Weather Forecast Office WEATHER Event SUMMARY February 2021 Historical Winter Storm Event South -Central Texas A Snow-Covered Texas. GeoColor satellite image from the morning of 15 February , 2021. 10-18 February 2021 February 2021 South Central Texas Historical Winter Storm Event South -Central Texas Winter Storm Event February 10-18, 2021 Event Summary Overview An unprecedented and Historical eight-day period of Winter weather occurred between 10 February and 18 February across South -Central Texas. The first push of arctic air arrived in the area on 10 February , with the cold air dropping temperatures into the 20s and 30s across most of the area. The first of several frozen precipitation events occurred on the morning of 11 February where up to inches of freezing rain accumulated on surfaces in Llano and Burnet Counties and inches of freezing rain accumulated across the Austin metropolitan area with lesser amounts in portions of the Hill Country and New Braunfels area.

2 For several days, the cold air mass remained in place across South -Central Texas, but a much colder air mass remained stationary across the Northern Plains. This record-breaking arctic air was able to finally move South into the region late on 14 February and into 15 February as a strong upper level low-pressure system moved through the Southern Plains. As this system moved through the region, snow began to fall and temperatures quickly fell into the single digits and teens. Most areas of South -Central Texas picked up at least an inch of snow with the highest amounts seen from Del Rio and Eagle Pass extending to the northeast into the Austin and San Antonio areas. Many areas along and near Interstate 35 reported 3 to 8 inches of snow. With the cold arctic air mass still in place and temperatures still below freezing, another upper level disturbance approaches from the west. Ahead of it, warm air aloft led to freezing rain across the Hill Country and I-35 corridor on the evening of 16 February and into the morning of the 17th.

3 Widespread areas recorded up to inches of additional ice accumulation, with higher amounts of up to inches of ice on already iced or snow-covered surfaces. Meanwhile, the upper disturbance sent a reinforcing cold front into the area the evening of the 17th. From the west, mixed precipitation in the form of freezing rain, sleet, graupel, and snow spread east and transitioned to all snow by the following Thursday morning. Significant record snowfall amounts as high as 11 inches fell in the Del Rio area, and the snow area spread east into the I-35 corridor. San Antonio recorded 2-3 inches, and Austin received less than an inch. Areas along Highway 90 between Del Rio and San Antonio picked up 4-7 inches, with some isolated higher totals. The blast of arctic air broke daily records for climate sites in the region. All climate sites saw 5 to 6 consecutive days of temperature records as well as multiple days of record-breaking snowfall.

4 This unforgettable Event had catastrophic impacts to the entire state of Texas, including South Central Texas, with failed power grids, burst water pipes, and limited road and air travel. February 2021 South Central Texas Historical Winter Storm Event Timeline of events Winter Storm Warnings across the entire State of Texas on February 14, 2021. February 2021 South Central Texas Historical Winter Storm Event Snowfall Event Maps February 2021 South Central Texas Historical Winter Storm Event Total Snowfall Event Map (Both snow events ) Minimum Temperature Map February 2021 South Central Texas Historical Winter Storm Event Broken Records for Climate Sites AUS - Austin Bergstrom International Airport February 2021 South Central Texas Historical Winter Storm Event ATT - Camp Mabry - Austin, TX February 2021 South Central Texas Historical Winter Storm Event Broken Records for Climate Sites Continued SAT - San Antonio International Airport San Antonio International Airport was below freezing for 4 days 12 hours during this Event .

5 This was 1 hour shy of the record set back in late Jan-early Feb 1951. DRT - Del Rio, TX February 2021 South Central Texas Historical Winter Storm Event Snowfall Reports Public Information Statement - Feb 15, 2021 Public Information Statement National Weather Service Austin/San Antonio TX 630 PM CST Mon Feb 15 2021 ..24 HOUR SNOWFALL Location Amount Time/Date Lat/Lon ..Atascosa Poteet in 1231 PM 02/15 ..Bandera 1 NNW Pipe Creek in 0137 PM 02/15 5 NNE Hill Country State Nat in 0313 AM 02/15 3 W Pipe Creek in 0700 AM 02/15 Medina in 0700 AM 02/15 1 N Medina in 0800 AM 02/15 3 ENE Utopia in 0700 AM 02/15 2 SSE Bandera in 0900 AM 02/15 ..Bastrop 4 ESE Wyldwood in 1140 AM 02/15 3 WNW Wyldwood in 0949 AM 02/15 Bastrop in 1048 AM 02/15 1 WSW Bastrop in 1141 AM 02/15 1 WNW McDade in 0700 AM 02/15 3 E Wyldwood in 0854 AM 02/15 4 E Circle D-KC Estate in 0700 AM 02/15.

6 Bexar 1 N Sea World in 1111 AM 02/15 2 SE Leon Valley in 0952 AM 02/15 3 ESE Sea World in 0925 AM 02/15 Leon Springs in 0856 AM 02/15 2 W Olmos Park in 1045 AM 02/15 Timberwood Park in 0918 AM 02/15 2 NNW Helotes in 0133 AM 02/15 2 SE Helotes in 0943 AM 02/15 3 SSE Bulverde in 0240 AM 02/15 2 WNW Castle Hills in 0230 AM 02/15 3 N Hollywood Park in 0228 AM 02/15 China Grove in 0600 AM 02/15 1 NNE Universal City in 0905 AM 02/15 4 SSE Timberwood Park in 1225 PM 02/15 6 WSW Sea World in 0928 AM 02/15 4 ENE Lackland AFB in 0903 AM 02/15 1 S Balcones Heights in 0837 AM 02/15 2 NE Saint Hedwig in 0721 AM

7 02/15 1 E Hollywood Park in 1026 AM 02/15 Converse in 0934 AM 02/15 2 WSW Shavano Park in 1254 AM 02/15 ..Blanco 3 NE Hye in 0830 AM 02/15 3 SSE Blanco in 0900 AM 02/15 February 2021 South Central Texas Historical Winter Storm Event ..Burnet 5 NNW Burnet in 0700 AM 02/15 Granite Shoals in 0930 AM 02/15 2 NE Bertram in 0700 AM 02/15 Burnet in 0700 AM 02/15 Marble Falls in 0930 AM 02/15 ..Caldwell 2 SW Lockhart in 1237 PM 02/15 6 SSE Dale in 1142 AM 02/15 3 ENE Fentress in 1223 PM 02/15 Lockhart in 0915 AM 02/15 7 SE Dale in 1238 PM 02/15 ..Comal Canyon Lake in 0944 AM 02/15 3 N Spring Branch in 1011 AM 02/15 2 NNE Bulverde in 0853 AM 02/15 New Braunfels in 1227 PM 02/15 1 WNW New Braunfels in 1037 AM 02/15 3 N Spring Branch in 0900 AM 02/15 7 NNE New Braunfels in 0331 AM 02/15 4 ENE New Braunfels in 0105 PM 02/15.

8 DeWitt 3 NNE Meyersville in 0600 AM 02/15 ..Dimmit 3 E Carrizo Springs in 0829 AM 02/15 2 SSW Carrizo Springs in 0700 AM 02/15 ..Fayette 1 WSW La Grange in 1133 AM 02/15 Muldoon in 1042 AM 02/15 ..Frio 9 S Frio Town in 1158 AM 02/15 6 ESE Frio Town in 1000 AM 02/15 Dilley in 0630 AM 02/15 ..Gillespie 4 W Fredericksburg in 0124 AM 02/15 ..Gonzales 2 N Cheapside in 0700 AM 02/15 Gonzales in 1110 AM 02/15 ..Guadalupe 3 SE Kingsbury in 1134 AM 02/15 5 NW Geronimo in 0335 AM 02/15 3 NNW Cibolo in 1131 AM 02/15 4 NE New Berlin in 0700 AM 02/15 2 SSE New Braunfels in 1056 AM 02/15 1 SSW Seguin in 0700 AM 02/15 1 NNE Geronimo in 0700 AM 02/15 4 WNW Geronimo in 0103 AM 02/15.

9 Hays 2 SSW Driftwood in 0800 AM 02/15 4 WNW Woodcreek in 0700 AM 02/15 5 WNW San Marcos in 1156 AM 02/15 4 WSW Wimberley in 0700 AM 02/15 4 SSE Buda in 1149 AM 02/15 Dripping Springs in 1015 AM 02/15 Kyle in 0916 AM 02/15 1 SSW Woodcreek in 0800 AM 02/15 February 2021 South Central Texas Historical Winter Storm Event 6 ENE Dripping Springs in 0700 AM 02/15 1 SSE Wimberley in 0858 AM 02/15 ..Karnes Falls City in 1200 PM 02/15 ..Kendall 6 NW Boerne in 0700 AM 02/15 1 W Boerne in 0835 AM 02/15 4 NNW Spring Branch in 1228 PM 02/15 1 SSE Sisterdale in 0700 AM 02/15 4 NNE Boerne in 0800 AM 02/15 1 ESE Boerne in 1155 AM 02/15 6 NNW Bergheim in 0700 AM 02/15 Comfort in 0700 AM 02/15.

10 Kerr Ingram in 0700 AM 02/15 1 N Ingram in 0800 AM 02/15 2 SSW Kerrville-Schreiner Pa in 0730 AM 02/15 1 NNE Hunt in 0815 AM 02/15 ..Kinney Brackettville in 1000 AM 02/15 ..Lavaca 8 N Hallettsville in 0700 AM 02/15 2 NNW Hallettsville in 0700 AM 02/15 ..Lee Dime Box in 0700 AM 02/15 6 SSW Giddings in 1241 PM 02/15 5 ENE Paige in 1230 PM 02/15 ..Llano 9 SSE Llano in 0123 PM 02/15 1 W Inks Lake State Park in 1009 AM 02/15 Llano in 0730 AM 02/15 3 N Kingsland in 0600 AM 02/15 ..Maverick 3 NNW Elm Creek in 1141 AM 02/15 Eagle Pass in 0800 AM 02/15 ..Medina 7 W Castroville in 0700 AM 02/15 Hondo in 1013 AM 02/15.