A dissipating thunderstorm in Young County produced a heatburst that produced 60 MPH winds across the county. No damage was reported from these winds.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FWD wrote it up.
A dissipating thunderstorm in Young County produced a heatburst that produced 60 MPH winds across the county. No damage was reported from these winds. A few more storms later in the night produced hail up to the size of pennies, but quarter sized hail was reported in Boonsville in Wise County. Another dissipating thunderstorm produced a heatburst in McLennan County with minor damage in the Waco area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Fort Worth, TX wrote its last area forecast discussion before the first event at Apr 21, 7:00 PM CST, 53 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE FORT WORTH TX 800 PM CDT THU APR 21 2011 .UPDATE... A WARM FRONT WILL CONTINUE TO LIFT NORTHWARD ACROSS THE REGION. SCATTERED STORMS WILL CONTINUE TO FORM ACROSS THE CONCHO VALLEY AND BIG COUNTRY AND DRIFT EAST TOWARD THE WESTERN ZONES. DIFFICULT TO SAY HOW STRONG THESE STORMS WILL BE WHEN THEY ARRIVE. RUC SOLUTION INDICATES STORMS WILL WEAKEN AS THEY MOVE EAST WHICH SEEMS REASONABLE WITH THE LOSS OF SURFACE HEATING. HOWEVER...WITH A BOUNDARY STILL IN NEAR THE REGION AND A 40 KNOT LOW LEVEL JET EXPECTED TO DEVELOP...WILL INCLUDE 20 PERCENT POPS ACROSS THE NORTH AND WEST THIS EVENING. NO OTHER MAJOR CHANGES AT THIS TIME. 79 && .AVIATION... CU OVER THE TAF SITES HAVE NOT LOOKED TOO IMPRESSIVE OVER THE PAST HOUR OR TWO. WITH THE WINDOW OF LITTLE TO NO CIN CLOSING AS SURFACE TEMPS BEGIN TO COOL...HAVE OPTED TO TAKE OUT THE CB IN THE TAFS. CONVECTION HAS FIRED TO OUR WEST WHERE THERE IS BETTER SURFACE CONVERGENCE AND SUBTLE UPPER SUPPORT. THERE IS A SMALL CHANCE THIS CONVECTION COULD MAKE IT AS FAR EAST AS THE METROPLEX...BUT CONFIDENCE IN THIS SCENARIO IS LOW AND WILL LEAVE ANY MENTION OF STORMS OUT OF THE TAF FOR NOW. WILL AMEND IF THESE STORMS HOLD TOGETHER AND TRACK MORE EASTERLY THAN NORTHEAST. OTHERWISE...LOW CLOUDS WILL STREAM NORTH OVERNIGHT. LAMP GUIDANCE SUGGEST IFR CONDITIONS...BUT THINK OUR SURFACE WINDS WILL BE TOO STRONG AND WILL STICK CLOSER TO THE MAV AND MET GUIDANCE OF LOW MVFR. SOUTHERLY WINDS WILL REMAIN AROUND 15 KNOTS AND EXPECT THEM TO INCREASE TOMORROW WITH GUSTS APPROACHING 30 KNOTS. CIGS SHOULD LIFT INTO VFR CATEGORIES AROUND NOON TOMORROW. 85/NH && .PREV DISCUSSION... /ISSUED 400 PM CDT THU APR 21 2011/ A WARM FRONT CONTINUES SURGING NORTH ACROSS NORTH TEXAS...THE MOTION CLEARLY EVIDENT ON SATELLITE. MOISTURE IS POOLING ALONG THE BOUNDARY...SOME SITES SEEING A RAPID 10-DEGREE INCREASE IN DEW POINT BEFORE MORE WELL MIXED AIR TAKES ITS PLACE. DESPITE THE TEMPORARY SURGE IN INSTABILITY...THE CU FIELD SHOWS THAT A SIGNIFICANT CAP REMAINS. THE BOUNDARY MAY BE A FOCUS FOR CONVECTIVE INITIATION THROUGH NIGHTFALL...PRIMARILY BETWEEN THE I-20 CORRIDOR AND THE RED RIVER. TO THIS POINT...PARCELS WITH SOURCE REGION IN BUOYANT AIR SOUTH OF THE BOUNDARY HAVE REMAINED TRAPPED BETWEEN THE FRONTAL INVERSION AND THE MID-LEVEL CAP BELOW 700MB. THOSE THAT HAVE REACHED THEIR LFC HAVE DONE SO FURTHER FROM THE SURFACE BOUNDARY...RIDING UP THE FRONTAL SLOPE INTO EASTERN OKLAHOMA AND ARKANSAS...WHERE THE MID-LEVEL INVERSION IS NEGLIGIBLE BUT LAPSE RATES ABOVE IT ARE STILL SIGNIFICANT. FOR AREAS IN NORTH TEXAS ALONG AND NORTH OF THE I-20 CORRIDOR...THERE WILL REMAIN A HAIL THREAT WITH ANY STORMS THAT DO FORM. NEAR- BOUNDARY SHEAR WILL BE FAVORABLE FOR SHORT-LIVED TORNADIC SUPERCELLS...BUT FLOW ALOFT WILL TEND TO CARRY STORMS AWAY FROM THE SURFACE BOUNDARY. ON FRIDAY...FOCUS FOR CONVECTION WILL BE THE DRYLINE IN FAR WESTERN NORTH TEXAS. WHILE THIS MAY IMPACT AREAS WITH ONGOING FIRES... CONVERGENCE NEAR THE BOUNDARY APPEARS UNFAVORABLE FOR CONVECTIVE INITIATION. EVEN WITHOUT RAIN...HUMIDITY WILL REMAIN AT HEALTHY LEVELS IN WESTERN NORTH TEXAS...DESPITE TEMPERATURES IN FIRE AREAS CLIMBING INTO THE 90S FRIDAY AFTERNOON. A COLD FRONT WILL APPROACH FROM THE NORTHWEST ON SATURDAY...BUT HAVE MAINTAINED A SURFACE WIND FIELD SIMILAR TO PREVIOUS FORECASTS THAT PREVENTS THE BOUNDARY FROM PENETRATING MUCH OF THE CWA. THOSE ENGAGED IN FIRE CONTAINMENT SHOULD BE PREPARED FOR A POTENTIAL WIND SHIFT. && .CLIMATE... FOR THE FIRST TIME IN THE 12-YEAR HISTORY OF THE U.S. DROUGHT MONITOR...THE ENTIRE STATE OF TEXAS IS IN DROUGHT. TWO THIRDS OF TEXAS IS CATEGORIZED AS BEING IN EXTREME (D3) OR EXCEPTIONAL DROUGHT (D4)...THE GREATEST EXTENT ON RECORD. 25 && .PRELIMINARY POINT TEMPS/POPS... DALLAS-FT. WORTH, TX 70 88 71 84 69 / 20 10 10 20 20 WACO, TX 71 92 73 91 72 / 10 5 10 10 10 PARIS, TX 66 86 67 81 66 / 20 10 20 30 20 DENTON, TX 68 88 69 81 66 / 20 10 20 30 30 MCKINNEY, TX 69 86 70 83 67 / 20 10 20 20 20 DALLAS, TX 72 89 71 85 70 / 20 10 10 20 20 TERRELL, TX 68 87 69 87 68 / 20 5 10 10 20 CORSICANA, TX 70 90 70 89 70 / 10 5 10 10 10 TEMPLE, TX 71 92 70 92 71 / 10 5 10 10 10 MINERAL WELLS, TX 70 92 68 82 67 / 20 20 20 30 30 && .FWD WATCHES/WARNINGS/ADVISORIES... NONE. && 85/79
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FORT WORTH TX 311 PM CDT THU APR 21 2011 TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-221200- MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN- HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS- ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL- JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO- FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE- LEON-MILAM-ROBERTSON- 311 PM CDT THU APR 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT. LOOK FOR A CHANCE OF STRONG TO SEVERE THUNDERSTORMS NORTHEAST OF A EASTLAND...WACO...PALESTINE LINE THROUGH MIDNIGHT. LARGE HAIL...VERY GUSTY WINDS...AND FREQUENT LIGHTNING CAN BE EXPECTED WITH ANY STRONG TO SEVERE STORMS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS NORTHWEST PARTS OF NORTH TEXAS FRIDAY AFTERNOON...THEN ALONG AND NORTH OF INTERSTATE 20 FRIDAY NIGHT INTO SATURDAY. A COLD FRONT WILL ARRIVE AND STALL ACROSS NORTHWEST PARTS OF NORTH TEXAS SATURDAY NIGHT AND EARLY SUNDAY. SCATTERED THUNDERSTORMS WILL BE POSSIBLE ALONG AND NEAR THE FRONT ACROSS MAINLY THE NORTHWEST HALF OF NORTH TEXAS. THUNDERSTORMS WILL BECOME MORE NUMEROUS LATE SUNDAY NIGHT INTO MONDAY ACROSS ALL OF NORTH TEXAS...AS A STRONG STORM SYSTEM AFFECTS THE AREA. LOW CHANCES FOR THUNDERSTORMS WILL LINGER ACROSS THE SOUTHEAST HALF OF NORTH TEXAS MONDAY NIGHT INTO TUESDAY. SEVERE WEATHER IS POSSIBLE WITH ANY THUNDERSTORM ACTIVITY THROUGH THE WEEKEND AND EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... LIMITED SPOTTER ACTIVATION MAY BE REQUESTED THROUGH THIS EVENING. 05/
The Dyess AFB radar (KDYX), 103 km away, was scanning. The volume nearest the first event began at 01:51 UTC.
6 hail, 3 thunderstorm wind. Local standard time, as filed.
A heatburst associated with dissipating convection occurred in Young County. The Olney Emergency Manager estimated 60 MPH winds with the heatburst. No damage was reported.
A heatburst associated with dissipating convection occurred in Young County. The fire department in Graham estimated 60 MPH winds with the heatburst. No damage was reported.
Penny size hail was reported 3 miles east-northeast of Perrin.
Hail up to the size of pennies was reported in Boonsville.
The hail size increased from penny size to quarter size in Boonsville.
Penny size hail was reported on the southwest side of Killeen.
Nickel size hail was reported by a CoCoRaHS observer south of Copperas Cove.
Penny size hail was reported at Fort Hood.
The McGregor AWOS reported a 60 MPH wind gust associated with a heatburst from a dissipating thunderstorm. Some minor damage was reported in Waco.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2011Every state in 2011This day in weather historyWarnings in Texas, April 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 295339, 295340, 295318, 295319, 295321, 295322, 295323, 295326, 295336.