Alert archive / Texas / Tornado Watches in 2019

Tornado Watch 113

April 30, 201930 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 30, 2019, 2:19 PM CDT for 30 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2019, 2:19 PM CDT (19:19 UTC)
Expired
Apr 30, 2019, 11:00 PM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 30 counties

Archer County, TX, Baylor County, TX, Bosque County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 46 km from the middle of the area, began a volume at 19:22 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
80%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 30, 3:00 PM CDTSevere Thunderstorm WarningOUNWichita, Wilbarger45 min
Apr 30, 3:10 PM CDTSevere Thunderstorm WarningOUNWichita, Wilbarger50 min
Apr 30, 4:00 PM CDTSevere Thunderstorm WarningOUNWichita45 min
Apr 30, 4:03 PM CDTSevere Thunderstorm WarningOUNClay, Wichita42 min
Apr 30, 4:11 PM CDTSevere Thunderstorm WarningFWDJack, Palo Pinto, Wise37 min
Apr 30, 4:31 PM CDTTornado WarningOUNClay, Wichita29 min
Apr 30, 4:56 PM CDTTornado WarningOUNClay24 min
Apr 30, 5:16 PM CDTSevere Thunderstorm WarningOUNWichita, Wilbarger44 min
Apr 30, 5:17 PM CDTTornado WarningFWDParker, Tarrant43 min
Apr 30, 5:27 PM CDTSevere Thunderstorm WarningFWDCooke, Denton63 min
Apr 30, 5:55 PM CDTTornado WarningFWDDenton, Tarrant, Wise50 min
Apr 30, 5:57 PM CDTSevere Thunderstorm WarningOUNWichita48 min
Apr 30, 6:26 PM CDTFlash Flood WarningFWDDenton, Tarrant3 hr
Apr 30, 6:36 PM CDTTornado WarningFWDDenton, Tarrant24 min
Apr 30, 6:55 PM CDTSevere Thunderstorm WarningOUNClay, Wichita50 min
Apr 30, 6:59 PM CDTTornado WarningFWDDenton31 min
Apr 30, 7:51 PM CDTSevere Thunderstorm WarningOUNClay39 min
Apr 30, 8:18 PM CDTSevere Thunderstorm WarningFWDFannin, Grayson42 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, 7.3 hours before the alert went out and 17 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 2019-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1278 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2019-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 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
1278 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
356 m²/s²
Significant tornado parameter
1.2
Supercell composite
8.5

Open this sounding in Storm Lab

The text

As transmitted.

472 
WWUS20 KWNS 301915
SEL3  
SPC WW 301915
TXZ000-010400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 113
NWS Storm Prediction Center Norman OK
220 PM CDT Tue Apr 30 2019

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  North Central Texas

* Effective this Tuesday afternoon and evening from 220 PM until
  1100 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Widespread large hail and isolated very large hail events to 3
    inches in diameter likely
  Scattered damaging wind gusts to 70 mph likely

SUMMARY...Thunderstorms are expected to develop and intensify over
north-central Texas this afternoon in a very moist and unstable
environment.  Large hail is the primary threat, but conditions are
favorable for a tornado or two in the strongest cells through the
early evening.

The tornado watch area is approximately along and 60 statute miles
east and west of a line from 35 miles west northwest of Sherman TX
to 45 miles south southeast of Stephenville TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).

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 111...WW 112...

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 24035.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 7:01 PM CDTSevere Thunderstorm WatchSPCAndrews, Borden, Dawson, Ector, Gaines, Howard and 7 more3 hr
Apr 29, 9:35 PM CDTMesoscale DiscussionSPCEctor, Loving, Winkler115 min
Apr 30, 1:53 PM CDTMesoscale DiscussionSPCArcher, Bosque, Brown, Callahan, Clay, Coleman and 28 more2 hr
Apr 30, 2:06 PM CDTMesoscale DiscussionSPCBailey, Borden, Cochran, Crosby, Dawson, Dickens and 17 more2 hr
Apr 30, 2:56 PM CDTMesoscale DiscussionSPCBaylor, Wilbarger2 hr
Apr 30, 4:26 PM CDTSevere Thunderstorm WatchSPCBorden, Briscoe, Brown, Callahan, Childress, Coke and 44 more8 hr
Apr 30, 5:21 PM CDTMesoscale DiscussionSPCArcher, Bosque, Clay, Collin, Comanche, Cooke and 19 more84 min
Apr 30, 6:47 PM CDTMesoscale DiscussionSPCBorden, Coke, Cottle, Crane, Crockett, Crosby and 36 more118 min

Nearby

Tornado Watches in Texas, 2019Every tornado watch in 2019

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.