Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 170, NWS Fort Worth, TX

May 21, 20136 counties in Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 21, 2013, 2:44 PM CDT for 6 counties in Texas. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 21, 2013, 2:44 PM CDT (19:44 UTC)
Expired
May 21, 2013, 3:45 PM CDT
In force
61 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

Counties Collin County, TX, Dallas County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Rockwall County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 107 km from the middle of the area, began a volume at 19:47 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 21, 10:26 AM CDTTornado WatchSPC10 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.7 hours before the alert went out and 89 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 2013-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1513 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2013-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 316 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1513 J/kg
Mixed-layer CIN
-271 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
316 m²/s²
0-3 km storm-relative helicity
251 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at May 21, 12:42 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, May 21, 12:42 PM CDT, 2 hours 2 minutes before
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Hazardous weather outlook, May 21, 3:03 AM CDT, 11 hours 41 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
303 AM CDT TUE MAY 21 2013

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-220815-
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-
303 AM CDT TUE MAY 21 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT.
THERE IS A MODERATE RISK OF SEVERE WEATHER ACROSS THE EASTERN
THREE QUARTERS OF NORTH TEXAS...AND A SLIGHT RISK OF SEVERE
WEATHER ACROSS THE REST OF THE AREA. A COLD FRONT IS EXPECTED TO
MOVE SOUTHEAST ACROSS NORTH TEXAS WITH THUNDERSTORMS BEGINNING
NEAR THE RED RIVER IN THE MORNING...SPREADING SOUTH AND EAST
AHEAD OF THE FRONT DURING THE DAY.

THE MAIN THREATS WILL BE FREQUENT LIGHTNING...HAIL LARGER THAN
TWO INCHES IN DIAMETER...AND DAMAGING WINDS. THE TORNADO THREAT
WILL INCREASE DURING THE DAY...WITH STRONG LONG TRACK TORNADOES A
POSSIBILITY. BY MID AFTERNOON THE STORMS ARE EXPECTED TO EVOLVE
INTO A SQUALL LINE...INCREASING THE DAMAGING STRAIGHT LINE WIND
POTENTIAL. THE SQUALL LINE SHOULD EXIT THE SOUTHEASTERN COUNTIES
BY LATE EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

A SLIGHT CHANCE OF THUNDERSTORMS RETURNS WEDNESDAY EVENING IN THE
NORTHWEST AND THURSDAY NIGHT INTO FRIDAY MORNING GENERALLY NORTH OF
THE I-20 CORRIDOR.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY BEGINNING IN THE MORNING FOR COUNTIES
NEAR THE RED RIVER...EXTENDING SOUTH AND EAST ACROSS NORTH TEXAS
DURING THE DAY AND EVENING.

In the hours before

Local storm report, May 21, 2:01 PM CDT, 43 minutes before
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Local storm report, May 21, 2:02 PM CDT, 42 minutes before
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Local storm report, May 21, 2:18 PM CDT, 26 minutes before
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Local storm report, May 21, 2:33 PM CDT, 11 minutes before
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Local storm report, May 21, 2:36 PM CDT, 8 minutes before
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Local storm report, May 21, 2:39 PM CDT, 5 minutes before
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The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 7:15 PM CDTSevere Thunderstorm WarningFWDMontague45 min
May 20, 7:44 PM CDTTornado WarningFWDComanche, Hamilton, Mills46 min
May 20, 8:27 PM CDTSevere Thunderstorm WarningFWDComanche63 min
May 20, 8:29 PM CDTTornado WarningFWDHamilton61 min
May 20, 8:42 PM CDTAreal Flood WarningFWDMills3 hr
May 20, 8:51 PM CDTSevere Thunderstorm WarningFWDHamilton, Mills54 min
May 20, 9:25 PM CDTSevere Thunderstorm WarningFWDComanche, Mills65 min
May 20, 9:31 PM CDTSevere Thunderstorm WarningFWDCoryell, Hamilton44 min
May 20, 9:54 PM CDTTornado WarningFWDCoryell, Hamilton36 min
May 20, 10:07 PM CDTHigh Wind WarningFWDAnderson, Collin, Dallas, Denton, Ellis, Falls and 13 more110 min
May 20, 10:10 PM CDTSevere Thunderstorm WarningFWDBosque, Coryell, Hamilton65 min
May 20, 10:31 PM CDTSevere Thunderstorm WarningFWDCoryell, Hamilton, Lampasas, Mills59 min
May 20, 10:41 PM CDTAreal Flood AdvisoryFWDHamilton2 hr
May 20, 11:15 PM CDTAreal Flood AdvisoryFWDComanche2 hr
May 20, 11:25 PM CDTSevere Thunderstorm WarningFWDCoryell50 min
May 20, 11:34 PM CDTAreal Flood WarningFWDMills4 hr
May 21, 11:28 AM CDTSpecial Weather StatementFWDYoung32 min
May 21, 12:00 PM CDTSevere Thunderstorm WarningFWDStephens60 min
May 21, 12:13 PM CDTSpecial Weather StatementFWDJack32 min
May 21, 1:07 PM CDTSpecial Weather StatementFWDWise23 min
May 21, 1:11 PM CDTSpecial Weather StatementFWDCooke34 min
May 21, 1:15 PM CDTSevere Thunderstorm WarningFWDDenton, Wise60 min
May 21, 1:26 PM CDTSevere Thunderstorm WarningFWDJack, Wise64 min
May 21, 1:44 PM CDTSevere Thunderstorm WarningFWDCollin, Grayson61 min
May 21, 1:51 PM CDTSpecial Weather StatementFWDDallas, Tarrant24 min
May 21, 1:52 PM CDTSevere Thunderstorm WarningFWDDallas, Tarrant53 min
May 21, 2:11 PM CDTSevere Thunderstorm WarningFWDDenton19 min
May 21, 2:51 PM CDTAreal Flood AdvisoryFWDDallas4 hr
May 21, 2:58 PM CDTSevere Thunderstorm WarningFWDLamar77 min
May 21, 3:18 PM CDTAreal Flood AdvisoryFWDCollin, Grayson3 hr
May 21, 3:26 PM CDTSevere Thunderstorm WarningFWDDelta, Hopkins79 min
May 21, 3:44 PM CDTAreal Flood AdvisoryFWDFannin3 hr
May 21, 3:51 PM CDTSevere Thunderstorm WarningFWDBell54 min
May 21, 4:04 PM CDTSpecial Weather StatementFWDMcLennan26 min
May 21, 4:23 PM CDTSevere Thunderstorm WarningFWDMcLennan67 min
May 21, 4:38 PM CDTAreal Flood AdvisoryFWDHunt, Kaufman, Rockwall3 hr
May 21, 4:44 PM CDTSevere Thunderstorm WarningFWDBell61 min
May 21, 4:52 PM CDTSevere Thunderstorm WarningFWDKaufman, Van Zandt53 min
May 21, 5:13 PM CDTSevere Thunderstorm WarningFWDHenderson62 min
May 21, 5:40 PM CDTSevere Thunderstorm WarningFWDFalls65 min
May 21, 5:54 PM CDTAreal Flood AdvisoryFWDBell3 hr
May 21, 5:54 PM CDTSpecial Weather StatementFWDFreestone36 min
May 21, 6:13 PM CDTSpecial Weather StatementFWDAnderson32 min
May 21, 6:18 PM CDTSpecial Weather StatementFWDRobertson27 min
May 21, 6:31 PM CDTAreal Flood AdvisoryFWDHenderson3 hr
May 21, 6:38 PM CDTSpecial Weather StatementFWDRobertson37 min

Nearby

Severe Thunderstorm Warnings in Texas, 2013Every severe thunderstorm warning in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.