February 2021 Historical Winter Storm Event South-Central Texas

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Austin/San AntonioWeather Forecast OfficeWEATHER EVENT SUMMARYFebruary 2021 Historical Winter Storm EventSouth-Central Texas10-18 February 2021A Snow-Covered Texas. GeoColor satellite image from the morning of 15 February, 2021.

February 2021 South Central Texas Historical Winter Storm EventSouth-Central Texas Winter Storm EventFebruary 10-18, 2021Event SummaryOverviewAn unprecedented and historical eight-day period of winter weather occurred between 10 Februaryand 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 frozenprecipitation events occurred on the morning of 11 February where up to 0.75 inches of freezing rainaccumulated on surfaces in Llano and Burnet Counties and 0.25-0.50 inches of freezing rain accumulatedacross the Austin metropolitan area with lesser amounts in portions of the Hill Country and New Braunfelsarea.For several days, the cold air mass remained in place across South-Central Texas, but a much colderair mass remained stationary across the Northern Plains. This record-breaking arctic air was able to finallymove south into the region late on 14 February and into 15 February as a strong upper level low-pressuresystem moved through the Southern Plains. As this system moved through the region, snow began to fall andtemperatures quickly fell into the single digits and teens. Most areas of South-Central Texas picked up at leastan inch of snow with the highest amounts seen from Del Rio and Eagle Pass extending to the northeast intothe 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 leveldisturbance approaches from the west. Ahead of it, warm air aloft led to freezing rain across the Hill Countryand I-35 corridor on the evening of 16 February and into the morning of the 17 th. Widespread areas recordedup to 0.25 inches of additional ice accumulation, with higher amounts of up to 0.6 inches of ice on already icedor snow-covered surfaces. Meanwhile, the upper disturbance sent a reinforcing cold front into the area theevening of the 17th. From the west, mixed precipitation in the form of freezing rain, sleet, graupel, and snowspread east and transitioned to all snow by the following Thursday morning. Significant record snowfallamounts 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 betweenDel 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 6consecutive days of temperature records as well as multiple days of record-breaking snowfall. Thisunforgettable event had catastrophic impacts to the entire state of Texas, including South Central Texas, withfailed power grids, burst water pipes, and limited road and air travel.

February 2021 South Central Texas Historical Winter Storm EventTimeline of EventsWinter Storm Warnings across the entire State of Texas on February 14, 2021.

February 2021 South Central Texas Historical Winter Storm EventSnowfall Event Maps

February 2021 South Central Texas Historical Winter Storm EventTotal Snowfall Event Map (Both snow events)Minimum Temperature Map

February 2021 South Central Texas Historical Winter Storm EventBroken Records for Climate SitesAUS - Austin Bergstrom International Airport

February 2021 South Central Texas Historical Winter Storm EventATT - Camp Mabry - Austin, TX

February 2021 South Central Texas Historical Winter Storm EventBroken Records for Climate Sites ContinuedSAT - San Antonio International AirportNote The San Antonio International Airport was below freezing for 4 days 12 hours during this event. Thiswas 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 EventSnowfall ReportsPublic Information Statement - Feb 15, 2021Public Information StatementNational Weather Service Austin/San Antonio TX630 PM CST Mon Feb 15 2021.24 HOUR SNOWFALL REPORTS.LocationAmountTime/DateLat/Lon3.0 in1231 PM 02/1529.04N/98.57W.Bandera County.1 NNW Pipe Creek5.0 in5 NNE Hill Country State Nat 4.5 in3 W Pipe Creek4.0 inMedina3.0 in1 N Medina3.0 in3 ENE Utopia3.0 in2 SSE Bandera2.8 /99.49W29.70N/99.06W.Bastrop County.4 ESE Wyldwood3 WNW WyldwoodBastrop1 WSW Bastrop1 WNW McDade3 E Wyldwood4 E Circle D-KC 6N/97.17W.Bexar County.1 N Sea World2 SE Leon Valley3 ESE Sea WorldLeon Springs2 W Olmos ParkTimberwood Park2 NNW Helotes2 SE Helotes3 SSE Bulverde2 WNW Castle Hills3 N Hollywood ParkChina Grove1 NNE Universal City4 SSE Timberwood Park6 WSW Sea World4 ENE Lackland AFB1 S Balcones Heights2 NE Saint Hedwig1 E Hollywood ParkConverse2 WSW Shavano 29.57N/98.58W.Blanco County.3 NE Hye3 SSE Blanco4.0 in4.0 in0830 AM 02/150900 AM 02/1530.28N/98.53W30.06N/98.41W.Texas.Atascosa County.Poteet

February 2021 South Central Texas Historical Winter Storm Event.Burnet County.5 NNW BurnetGranite Shoals2 NE BertramBurnetMarble .Caldwell County.2 SW Lockhart6 SSE Dale3 ENE FentressLockhart7 SE Comal County.Canyon Lake3 N Spring Branch2 NNE BulverdeNew Braunfels1 WNW New Braunfels3 N Spring Branch7 NNE New Braunfels4 ENE New 4W29.92N/98.41W29.79N/98.07W29.72N/98.06W.DeWitt County.3 NNE Meyersville1.7 in0600 AM 02/1528.97N/97.29W.Dimmit County.3 E Carrizo Springs2 SSW Carrizo Springs1.5 in1.3 in0829 AM 02/150700 AM 02/1528.52N/99.81W28.49N/99.87W.Fayette County.1 WSW La GrangeMuldoon5.5 in3.5 in1133 AM 02/151042 AM 02/1529.90N/96.89W29.82N/97.07W.Frio County.9 S Frio Town6 ESE Frio TownDilley4.5 in2.0 in1.0 in1158 AM 02/151000 AM 02/150630 AM spie County.4 W Fredericksburg2.5 in0124 AM 02/1530.27N/98.94W.Gonzales County.2 N CheapsideGonzales3.5 in3.0 in0700 AM 02/151110 AM 02/1529.31N/97.41W29.51N/97.45W.Guadalupe County.3 SE Kingsbury5 NW Geronimo3 NNW Cibolo4 NE New Berlin2 SSE New Braunfels1 SSW Seguin1 NNE Geronimo4 WNW W29.55N/97.97W29.68N/97.96W29.70N/98.03W.Hays County.2 SSW Driftwood4 WNW Woodcreek5 WNW San Marcos4 WSW Wimberley4 SSE BudaDripping SpringsKyle1 SSW 1W30.19N/98.09W29.99N/97.88W30.02N/98.12W

February 2021 South Central Texas Historical Winter Storm Event6 ENE Dripping Springs1 SSE Wimberley5.0 in4.0 in0700 AM 02/150858 AM 02/1530.22N/97.99W29.98N/98.09W.Karnes County.Falls City1.5 in1200 PM 02/1528.98N/98.02W.Kendall County.6 NW Boerne1 W Boerne4 NNW Spring Branch1 SSE Sisterdale4 NNE Boerne1 ESE Boerne6 NNW rr County.Ingram3.41 N Ingram3.42 SSW Kerrville-Schreiner Pa 3.21 NNE .09N/99.33W.Kinney County.Brackettville4.5 in1000 AM 02/1529.31N/100.42W.Lavaca County.8 N Hallettsville2 NNW Hallettsville1.2 in1.0 in0700 AM 02/150700 AM 02/1529.56N/96.94W29.47N/96.95W.Lee County.Dime Box6 SSW Giddings5 ENE Paige6.0 in5.5 in4.0 in0700 AM 02/151241 PM 02/151230 PM 02/1530.36N/96.82W30.10N/96.97W30.23N/97.03W.Llano County.9 SSE Llano1 W Inks Lake State ParkLlano3 N 30.74N/98.39W30.75N/98.67W30.70N/98.44W.Maverick County.3 NNW Elm CreekEagle Pass5.0 in3.0 in1141 AM 02/150800 AM 02/1528.81N/100.50W28.71N/100.50W.Medina County.7 W CastrovilleHondo6.0 in6.0 in0700 AM 02/151013 AM 02/1529.35N/99.00W29.35N/99.14W.Real County.Leakey3.0 in0929 AM 97.76Winininin.Travis County.Lakeway7.5 in5 NNE Austin6.6 in4 N Austin6.5 in1 S Lakeway6.5 inLakeway6.5 in4 WNW Sunset Valley6.5 in1 S McKinney Falls State Par 6.0 in6 NNE West Lake Hills5.9 in3 SSW Jollyville5.8 in2 SSE Jollyville5.8 in2 ESE Lakeway5.6 inLago Vista5.5 in2 NNW Tanglewood Forest5.3 in3 NNW Austin5.1 /1502/1502/1502/1502/1502/15

February 2021 South Central Texas Historical Winter Storm Event3 SW Pflugerville3 SSE Wells Branch7 SW Briarcliff4 NE Austin3 S JollyvilleManor1 SW Anderson Mill5.0 in5.0 in5.0 in5.0 in4.4 in4.0 in4.0 in1004 AM 02/151001 AM 02/150914 AM 02/150204 AM 02/150206 AM 02/151257 AM 02/150815 AM lde County.Sabinal8 S Montell5.0 in3.0 in1227 AM 02/150900 AM 02/1529.32N/99.47W29.42N/100.02W.Val Verde County.1 NNW Del Rio3.0 in0138 PM 02/1529.37N/100.90W.Williamson County.1 WSW Leander1 WNW Cedar ParkCedar ParkRound Rock1 N Brushy Creek1 NE Round Rock2 WSW JollyvilleAnderson Mill6 ESE CouplandGeorgetown1 S Round RockBrushy Creek2 NNW Georgetown Dam1 SW Round 51N/97.68W.Wilson County.5 N Floresville3 ENE Calaveras Lake2 N Sutherland Springs3 E La 0N/98.06W29.35N/98.06W.Zavala County.La PryorCrystal City5.5 in4.0 in1012 AM 02/150700 AM 02/1528.94N/99.85W28.69N/99.82WObservations are collected from a variety of sources with varyingequipment and exposures. We thank all volunteer weather observersfor their dedication. Not all data listed are considered official.

February 2021 South Central Texas Historical Winter Storm EventPublic Information Statement - Feb 19, 2021Public Information StatementNational Weather Service Austin/San Antonio TX1027 AM CST Fri Feb 19 2021.SNOWFALL REPORTS.LocationAmountTime/DateProvider.Bandera County.2 ESE Lake Medina ShoresPipe Creek6 ESE Medina5 SSE Camp 2/1802/1802/1802/18Amateur RadioPublicPublicEmergency Mngr.Bexar County.1 N Leon Springs3 NW Helotes3 SE Helotes1 W Balcones Heights1 WSW Timberwood Park2 WNW Castle Hills2 SW Timberwood Park3 E Castle Hills7 SW China Grove3 WSW Sea WorldShavano ParkConverseHollywood Park4 SE San Antonio3 NNW Live OakBoerne 5.8 2/1802/19PublicTrained SpotterTrained SpotterBroadcast MediaPublicBroadcast MediaPublicOther FederalPublicPublicPublicPublicTrained SpotterTrained SpotterTrained SpotterCOCORAHS.Blanco County.Johnson City0.5 in0500 PM 02/18Emergency Mngr.Caldwell County.5 SSW Lockhart1.5 in0205 PM 02/18Trained Spotter.Comal County.3 N Canyon Lake2 S Canyon LakeSpring Branch2 NNE BulverdeNew Braunfels 0.1 ENE3 WNW New Braunfels5 WNW New Braunfels8 WSW San Marcos7 NNE New 2707000402040012270300PublicPublicPublicNWS EmployeeCOCORAHSNWS EmployeeNWS EmployeeEmergency MngrNWS Employee.Frio County.MoorePearsallDilley2.5 in2.0 in0.1 in0259 PM 02/180258 PM 02/180256 PM 02/18Emergency MngrCounty OfficialEmergency Mngr.Guadalupe County.New Braunfels 3.3 S3 NNW CiboloZorn5 NW OCORAHSNWS EmployeeCounty OfficialNWS EmployeeEmergency 1802/1802/1802/1902/1802/1802/1802/18

February 2021 South Central Texas Historical Winter Storm Event.Hays County.Wimberley 4.4 ESan Marcos4 W San Marcos3 SSW KyleWoodcreek 0.5 SSWDripping Springs 4.7 OCORAHSPublicTrained SpotterNWS EmployeeCOCORAHSCOCORAHS.Kendall County.BoerneBoerne 6.5 NBoerne 1.2 EBoerne 1.6 EComfort 0.9 AMAMAMAM02/1802/1902/1902/1902/19Emergency MngrCOCORAHSCOCORAHSCOCORAHSCOCORAHS.Kinney County.Brackettville7.8 in0830 PM 02/18Emergency Mngr.Medina County.Devine 0.4 S3 W Rio MedinaMico 22 2/18COCORAHSCocorahsCOOPPublic.Real County.4 NNW LeakeyLeakey 1.5 ENE4.5 in2.5 in0400 PM 02/180638 AM 02/19CocorahsCOCORAHS.Travis County.3 SSW Jollyville0.1 in0417 PM 02/18CO-OP Observer.Uvalde County.4 NNE Uvalde2 E Uvalde8 SSW ConcanConcan5.03.53.53.50425014104250630Emergency MngrEmergency MngrEmergency MngrPublic.Val Verde County.3 SSE Lake View3 NW Del Rio11.2 in8.5 in0530 PM 02/181200 PM 02/18CO-OP ObserverTrained Spotter.Wilson County.La Vernia 3.0 EStockdale 8.4 N6 NW 030003000300COCORAHSCOCORAHSEmergency MngrEmergency MngrEmergency 8Observations are collected from a variety of sources with varyingequipment and exposures. We thank all volunteer weather observersfor their dedication. Not all data listed are considered official.

February 2021 South Central Texas Historical Winter Storm EventEvent Photos

February 2021 South Central Texas Historical Winter Storm Event

February 2021 South Central Texas Historical Winter Storm Event

February 2021 South Central Texas Historical Winter Storm Event

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

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