Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 153, NWS Fort Worth, TX

June 20, 2018Tarrant County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jun 20, 2018, 10:15 PM CDT for Tarrant County, Texas. It was in force for 45 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
Jun 20, 2018, 10:15 PM CDT (03:15 UTC)
Expired
Jun 20, 2018, 11:00 PM CDT
In force
45 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 22 km from the middle of the area, began a volume at 03:14 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 00:00Z, 3.3 hours before the alert went out and 7 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 00:00Z on 2018-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 727 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 00:00Z on 2018-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 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
727 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
1338 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.6

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 Jun 20, 10:09 PM CDT, 6 minutes earlier.

Area forecast discussion, Jun 20, 10:09 PM CDT, 6 minutes before
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Hazardous weather outlook, Jun 20, 7:15 PM CDT, 3 hours before
Hazardous Weather Outlook...UPDATED
National Weather Service Fort Worth TX
715 PM CDT Wed Jun 20 2018

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-220015-
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-
715 PM CDT Wed Jun 20 2018

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...Tonight.
Thunderstorms are possible this evening, primarily near and north of
I-20/I-30. While severe weather is not anticipated, the strongest
storms will be capable of producing strong wind gusts and small hail
in addition to brief heavy rainfall. Isolated thunderstorms will then
be possible overnight, mainly east of I-35.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thunderstorm chances will continue mostly east of Interstate 35 on
Thursday. The main hazards will be locally heavy rainfall, gusty
winds, and lightning.

Thunderstorm complexes moving southeast from Oklahoma may affect
parts of North Texas both Friday and Saturday night.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 20, 8:48 PM CDT, 1 hour 27 minutes before
Special Weather Statement
National Weather Service Fort Worth TX
848 PM CDT WED JUN 20 2018

TXZ094-210215-
Fannin TX-
848 PM CDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL FANNIN COUNTY UNTIL
915 PM CDT...

At 846 PM CDT, Doppler radar was tracking a strong thunderstorm over
Dodd City, or 7 miles east of Bonham, moving south at 5 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm. The core of the storm should remain east of Bonham.

LAT...LON 3347 9586 3349 9618 3366 9620 3368 9585
TIME...MOT...LOC 0146Z 350DEG 5KT 3359 9605

25
Special weather statement, Jun 20, 8:59 PM CDT, 1 hour 16 minutes before
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Special weather statement, Jun 20, 9:08 PM CDT, 1 hour 7 minutes before
Special Weather Statement
National Weather Service Fort Worth TX
908 PM CDT WED JUN 20 2018

TXZ094-210230-
Fannin TX-
908 PM CDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN FANNIN COUNTY UNTIL
930 PM CDT...

At 907 PM CDT, Doppler radar was tracking a strong thunderstorm over
Dodd City, or 7 miles southeast of Bonham, moving south at 10 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Bailey around 930 PM CDT.

The core of the storm will remain southeast of the city of Bonham.

LAT...LON 3360 9586 3341 9586 3340 9590 3336 9625
      3361 9615
TIME...MOT...LOC 0207Z 006DEG 9KT 3354 9607

25
Special weather statement, Jun 20, 9:17 PM CDT, 58 minutes before
Special Weather Statement
National Weather Service Fort Worth TX
917 PM CDT WED JUN 20 2018

TXZ103-210245-
Denton TX-
917 PM CDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR DENTON COUNTY UNTIL 945 PM CDT...

At 915 PM CDT, Doppler radar was tracking strong thunderstorms
within Denton County. Movement was southwest at 20 mph.

Winds in excess of 40 mph will be possible with these storms. At 915
PM CDT, the leading edge of these outflow winds had reached Corinth,
Lake Dallas, and Hackberry.

LAT...LON 3341 9684 3299 9685 3299 9740 3300 9740
      3343 9738
TIME...MOT...LOC 0215Z 029DEG 18KT 3315 9712 3313 9703 3314 9694

25
Special weather statement, Jun 20, 9:39 PM CDT, 36 minutes before
Special Weather Statement
National Weather Service Fort Worth TX
939 PM CDT WED JUN 20 2018

TXZ103-118-119-210300-
Denton TX-Tarrant TX-Dallas TX-
939 PM CDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN DENTON...NORTHEASTERN
TARRANT AND NORTHWESTERN DALLAS COUNTIES UNTIL 1000 PM CDT...

At 936 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms in Denton County, moving south at 20 mph.

Pea hail and wind gusts up to 50 mph will be possible with these
storms.

The leading edge of the strong outflow winds have reached New
Fairview, Roanoke, and Carrollton. The strongest winds will impact
northeastern portions of Tarrant County, including Keller,
Southlake, and Grapevine.

LAT...LON 3308 9719 3307 9684 3281 9684 3283 9725
      3299 9740 3323 9739
TIME...MOT...LOC 0236Z 009DEG 19KT 3316 9740 3301 9721 3300 9692

25
Local storm report, Jun 20, 10:10 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
Jun 20, 7:13 PM CDTSpecial Weather StatementFWDCooke, Grayson47 min
Jun 20, 7:59 PM CDTSpecial Weather StatementFWDFannin46 min
Jun 20, 8:04 PM CDTSpecial Weather StatementFWDCooke, Grayson41 min
Jun 20, 8:17 PM CDTSevere Thunderstorm WarningFWDCollin, Grayson46 min
Jun 20, 8:48 PM CDTSpecial Weather StatementFWDFannin27 min
Jun 20, 8:59 PM CDTSpecial Weather StatementFWDDenton31 min
Jun 20, 9:08 PM CDTSpecial Weather StatementFWDFannin22 min
Jun 20, 9:17 PM CDTSpecial Weather StatementFWDDenton28 min
Jun 20, 9:39 PM CDTSpecial Weather StatementFWDDenton21 min
Jun 20, 9:54 PM CDTSevere Thunderstorm WarningFWDDallas, Denton, Tarrant21 min
Jun 21, 12:13 AM CDTSpecial Weather StatementFWDPalo Pinto32 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018Every 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.