Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 97, NWS Fort Worth, TX

April 21, 2018Jack County, Palo Pinto County, Young County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Apr 21, 2018, 3:26 PM CDT for Jack County, Palo Pinto County, Young County, Texas. It was in force for 64 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: Apr 21, 2018, 3:26 PM CDT (20:26 UTC)
Expired: Apr 21, 2018, 4:30 PM CDT
In force: 64 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jack County, TX, Palo Pinto County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 99 km from the middle of the area, began a volume at 20:28 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.4 hours before the alert went out and 106 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 317 m²/s²
0-3 km storm-relative helicity: 320 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Apr 21, 1:12 PM CDT, 2 hours 14 minutes earlier.

Area forecast discussion, Apr 21, 1:12 PM CDT, 2 hours 14 minutes before

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Hazardous weather outlook, Apr 21, 2:58 AM CDT, 12 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Fort Worth TX
258 AM CDT Sat Apr 21 2018

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-220800-
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-
258 AM CDT Sat Apr 21 2018

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...Today and Tonight.
An increase in thunderstorms is expected across the region this
morning. Thunderstorms will become more numerous in North Texas
throughout the day with coverage remaining more scattered across
Central Texas. The main hazard through early afternoon will be cloud
to ground lightning.

Later this afternoon or evening, a few strong or possibly severe
storms may occur along a southeastward-moving cold front. Hail near
the size of quarters and strong winds would be the main hazards if
stronger storms are able to develop. In addition, heavy rain may pose
a threat for minor flooding, especially along and north of
Interstate 20. Storms are expected to end from west to east Saturday
night into early Sunday morning.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Thunderstorm chances will return to all of North and Central Texas
Tuesday night through Wednesday night, and again on Friday.

.SPOTTER INFORMATION STATEMENT...
Limited spotter activation may be requested late this afternoon or
evening.

In the hours before

Special weather statement, Apr 21, 9:45 AM CDT, 5 hours 41 minutes before

Special Weather Statement
National Weather Service Fort Worth TX
945 AM CDT SAT APR 21 2018

TXZ092-102-103-211530-
Denton TX-Cooke TX-Wise TX-
945 AM CDT SAT APR 21 2018

...SPECIAL WEATHER STATEMENT...

At 945 AM CDT, Doppler radar was tracking a strong thunderstorm 9
miles east of Decatur, moving northeast at 55 mph.

Half inch hail will be possible with this storm.

Locations impacted include...
Gainesville, Sanger, Decatur, Krum, New Fairview, Callisburg, Lake
Kiowa, Ray Roberts Park Johnson Branch and Valley View.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm. Seek
a safe shelter inside a building or vehicle.

&&

LAT...LON 3363 9694 3351 9694 3309 9743 3324 9759
      3372 9712 3372 9711 3375 9708
TIME...MOT...LOC 1445Z 221DEG 46KT 3325 9743

58

Local storm report, Apr 21, 10:21 AM CDT, 5 hours 5 minutes before

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Special weather statement, Apr 21, 10:24 AM CDT, 5 hours 2 minutes before

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Special weather statement, Apr 21, 2:48 PM CDT, 38 minutes before

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Special weather statement, Apr 21, 3:20 PM CDT, 6 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 9:06 AM CDT	Special Weather Statement	FWD	Cooke	24 min
Apr 21, 9:45 AM CDT	Special Weather Statement	FWD	Cooke	45 min
Apr 21, 10:24 AM CDT	Special Weather Statement	FWD	Grayson	51 min
Apr 21, 2:48 PM CDT	Special Weather Statement	FWD	Young	42 min
Apr 21, 3:20 PM CDT	Special Weather Statement	FWD	Palo Pinto	40 min
Apr 21, 4:15 PM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto, Parker	60 min
Apr 21, 5:05 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	55 min
Apr 21, 5:27 PM CDT	Special Weather Statement	FWD	Hood	33 min
Apr 21, 5:49 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Somervell	56 min
Apr 21, 5:58 PM CDT	Special Weather Statement	FWD	Tarrant	32 min
Apr 21, 6:02 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Tarrant	35 min
Apr 21, 6:07 PM CDT	Areal Flood Advisory	FWD	Tarrant	113 min
Apr 21, 6:25 PM CDT	Special Weather Statement	FWD	Johnson	35 min
Apr 21, 6:43 PM CDT	Severe Thunderstorm Warning	FWD	Bosque, Ellis, Hill, Johnson	62 min
Apr 21, 6:57 PM CDT	Special Weather Statement	FWD	Ellis	33 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018 Every severe thunderstorm warning in 2018

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.