Alert archive / Texas / Tornado Watches in 2013

Tornado Watch 192

May 20, 201339 counties in Texas

The Storm Prediction Center issued this tornado watch at May 20, 2013, 2:21 PM CDT for 39 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2013, 2:21 PM CDT (19:21 UTC)
Expired
May 20, 2013, 10:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 39 counties

Bosque County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Coryell County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Fannin County, TX, Gillespie County, TX, Grayson County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, San Saba County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 59 km from the middle of the area, began a volume at 19:25 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

38 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 20, 3:30 PM CDTSevere Thunderstorm WarningSJTJones, Shackelford45 min
May 20, 3:33 PM CDTSevere Thunderstorm WarningFWDEastland57 min
May 20, 3:41 PM CDTSevere Thunderstorm WarningSJTBrown49 min
May 20, 4:11 PM CDTTornado WarningSJTBrown34 min
May 20, 4:17 PM CDTSevere Thunderstorm WarningFWDStephens58 min
May 20, 4:35 PM CDTTornado WarningSJTBrown25 min
May 20, 4:38 PM CDTSevere Thunderstorm WarningFWDComanche52 min
May 20, 4:45 PM CDTSevere Thunderstorm WarningFWDJack, Palo Pinto, Young60 min
May 20, 4:51 PM CDTTornado WarningSJTBrown24 min
May 20, 5:08 PM CDTTornado WarningSJTBrown37 min
May 20, 5:10 PM CDTTornado WarningFWDComanche50 min
May 20, 5:17 PM CDTSevere Thunderstorm WarningFWDJack, Young58 min
May 20, 5:27 PM CDTTornado WarningFWDMontague63 min
May 20, 5:41 PM CDTTornado WarningSJTBrown34 min
May 20, 5:52 PM CDTSevere Thunderstorm WarningFWDMontague, Wise53 min
May 20, 5:59 PM CDTTornado WarningFWDComanche, Mills46 min
May 20, 6:15 PM CDTSevere Thunderstorm WarningSJTBrown30 min
May 20, 6:20 PM CDTSevere Thunderstorm WarningFWDCooke55 min
May 20, 6:29 PM CDTTornado WarningFWDCooke, Montague61 min
May 20, 6:31 PM CDTFlash Flood WarningFWDMontague119 min
May 20, 6:41 PM CDTSevere Thunderstorm WarningSJTBrown34 min
May 20, 6:43 PM CDTSevere Thunderstorm WarningFWDComanche, Hamilton, Mills62 min
May 20, 6:44 PM CDTFlash Flood WarningFWDComanche4 hr
May 20, 6:44 PM CDTTornado WarningSJTBrown31 min
May 20, 6:52 PM CDTTornado WarningFWDComanche, Hamilton, Mills53 min
May 20, 6:57 PM CDTSevere Thunderstorm WarningFWDJack, Palo Pinto, Stephens, Young63 min
May 20, 7:15 PM CDTSevere Thunderstorm WarningFWDMontague45 min
May 20, 7:15 PM CDTSevere Thunderstorm WarningSJTBrown45 min
May 20, 7:44 PM CDTTornado WarningFWDComanche, Hamilton, Mills46 min
May 20, 8:03 PM CDTSevere Thunderstorm WarningSJTBrown27 min
May 20, 8:27 PM CDTSevere Thunderstorm WarningFWDComanche63 min
May 20, 8:29 PM CDTTornado WarningFWDHamilton61 min
May 20, 8:49 PM CDTSevere Thunderstorm WarningSJTBrown41 min
May 20, 8:51 PM CDTSevere Thunderstorm WarningFWDHamilton, Mills54 min
May 20, 8:51 PM CDTTornado WarningSJTBrown24 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

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.4 hours before the alert went out and 128 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 2013-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 747 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 2013-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 275 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
747 J/kg
Mixed-layer CIN
-390 J/kg
Mixed-layer LCL
893 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
275 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

294 
WWUS20 KWNS 201924
SEL2  
SPC WW 201924
TXZ000-210300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 192
NWS STORM PREDICTION CENTER NORMAN OK
220 PM CDT MON MAY 20 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL AND NORTHERN TEXAS

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
    EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES WEST NORTHWEST OF
SHERMAN TEXAS TO 65 MILES SOUTHEAST OF SAN ANGELO TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 189...WW 190...WW 191...

DISCUSSION...DISCRETE SUPERCELLS ARE EXPECTED TO INITIATE ALONG THE
DRYLINE DURING THE NEXT FEW HOURS...BEFORE 30-40 KT DEEP LAYER MEAN
WEST SOUTHWESTERLY FLOW SUPPORTS PROPAGATION AWAY FROM THE DRY LINE
INTO PARTS OF NORTHERN AND CENTRAL TEXAS.  LOW-LEVEL HODOGRAPHS ARE
EXPECTED TO STILL STRENGTHEN SOME LATE THIS AFTERNOON INTO THE
EVENING...PARTICULARLY NEAR THE RED RIVER.  AS THIS OCCURS...AND
ACTIVITY SPREADS INTO A LESS STRONGLY HEATED/HIGHER RELATIVELY
HUMIDITY BOUNDARY LAYER AIR MASS EAST OF THE DRY LINE...A RISK FOR
TORNADOES WILL EXIST...IN ADDITION TO THE POTENTIAL FOR LARGE HAIL
AND LOCALLY DAMAGING WIND GUSTS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25025.


...KERR

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 8:53 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Canadian, Carter, Cherokee and 48 more67 min
May 19, 10:44 PM CDTTornado WatchSPCAdair, Cherokee, Craig, Creek, Delaware, Haskell and 19 more5 hr
May 20, 2:44 AM CDTMesoscale DiscussionSPCCraig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more2 hr
May 20, 12:26 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Canadian, Carter, Cherokee and 42 more2 hr
May 20, 1:10 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Caddo, Canadian, Carter and 49 more9 hr
May 20, 2:31 PM CDTMesoscale DiscussionSPCCraig, Creek, Lincoln, Logan, Nowata, Okfuskee and 7 more119 min
May 20, 5:34 PM CDTMesoscale DiscussionSPCLove56 min
May 20, 6:33 PM CDTMesoscale DiscussionSPCBryan, Johnston, Love, Marshall57 min
May 20, 1:19 PM CDTMesoscale DiscussionSPCBell, Bosque, Brown, Burnet, Callahan, Clay and 29 more116 min

Nearby

Tornado Watches in Texas, 2013Every tornado watch 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.