Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 175, NWS Fort Worth, TX

July 12, 2020Dallas County, Tarrant County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jul 12, 2020, 3:42 AM CDT for Dallas County, Tarrant County, Texas. It was in force for 33 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: Jul 12, 2020, 3:42 AM CDT (08:42 UTC)
Expired: Jul 12, 2020, 4:15 AM CDT
In force: 33 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dallas County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 33 km from the middle of the area, began a volume at 08:42 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, 8.7 hours before the alert went out and 25 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: 2012 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 1989 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jul 12, 3:28 AM CDT, 14 minutes earlier.

Area forecast discussion, Jul 12, 3:28 AM CDT, 14 minutes before

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Hazardous weather outlook, Jul 12, 3:30 AM CDT, 12 minutes before

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In the hours before

Special weather statement, Jul 12, 2:43 AM CDT, 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Forth Worth TX
Issued by National Weather Service Shreveport LA
243 AM CDT Sun Jul 12 2020

TXZ091-092-120830-
Cooke TX-Montague TX-
243 AM CDT Sun Jul 12 2020

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Montague and central
Cooke Counties Until 330 AM CDT....

At 242 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM over
Leon, or 17 miles east of Nocona...MOVING southeast AT 30 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
Gainesville, Muenster, Lindsay and Valley View.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3389 9745 3383 9746 3382 9738 3388 9733
      3386 9733 3389 9731 3386 9726 3392 9721
      3386 9717 3381 9721 3376 9719 3372 9711
      3385 9709 3386 9706 3350 9711 3382 9774
      3391 9759 3392 9749
TIME...MOT...LOC 0742Z 302DEG 27KT 3387 9744

99

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 12:55 AM CDT	Severe Thunderstorm Warning	FWD	Fannin, Lamar	22 min
Jul 12, 1:56 AM CDT	Severe Thunderstorm Warning	FWD	Cooke, Grayson, Montague	34 min
Jul 12, 2:31 AM CDT	Severe Thunderstorm Warning	FWD	Cooke, Grayson	44 min
Jul 12, 2:43 AM CDT	Special Weather Statement	FWD	Cooke	47 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every severe thunderstorm warning in 2020

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.