Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 20, NWS Fort Worth, TX

March 17, 2018Leon County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Mar 17, 2018, 8:20 PM CDT for Leon County, Texas. It was in force for 55 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
Mar 17, 2018, 8:20 PM CDT (01:20 UTC)
Expired
Mar 17, 2018, 9:15 PM CDT
In force
55 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Leon County, TX

The radar

The Ft Hood radar (KGRK), 147 km from the middle of the area, began a volume at 01:20 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Mar 17, 2:20 PM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.3 hours before the alert went out and 210 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 2018-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2018-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1216 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
234 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 Mar 17, 7:30 PM CDT, 50 minutes earlier.

Area forecast discussion, Mar 17, 7:30 PM CDT, 50 minutes before
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Hazardous weather outlook, Mar 17, 3:02 PM CDT, 5 hours 18 minutes before
Hazardous Weather Outlook
National Weather Service Fort Worth TX
302 PM CDT Sat Mar 17 2018

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-181230-
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-
302 PM CDT Sat Mar 17 2018

This Hazardous Weather Outlook is for North and Central Texas.

.DAY ONE...Tonight.
Severe thunderstorms are expected to affect much of North and
Central Texas through this evening and tonight. The most likely areas
for severe weather and supercell thunderstorms are near and south of
Interstate 20. Large hail will be the primary threat, although
damaging winds and tornadoes are also possible.

Later tonight, storms are expected to grow into a larger cluster or
broken line as they move east of Interstate 35. Damaging winds and
large hail will continue to be possible.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Thunderstorm chances will continue for North and Central Texas
Sunday and Sunday night. A few storms could be severe during this
time with mainly a large hail and damaging wind threat. The severe
threat will be highest east of I-35 during this time.

Critical fire weather conditions may occur west of I-35 on Sunday
afternoon and across all of North and Central Texas on Monday
afternoon.

.SPOTTER INFORMATION STATEMENT...
Spotter activation will likely be requested throughout this evening.

In the hours before

Special weather statement, Mar 17, 7:19 PM CDT, 1 hour 1 minute before
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Special weather statement, Mar 17, 7:27 PM CDT, 53 minutes before
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Special weather statement, Mar 17, 7:43 PM CDT, 37 minutes before
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Special weather statement, Mar 17, 7:56 PM CDT, 24 minutes before
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Local storm report, Mar 17, 8:01 PM CDT, 19 minutes before
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Special weather statement, Mar 17, 8:16 PM CDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 17, 7:19 PM CDTSpecial Weather StatementFWDRobertson41 min
Mar 17, 7:22 PM CDTSevere Thunderstorm WarningFWDFalls, Leon, Limestone, Robertson53 min
Mar 17, 7:27 PM CDTSpecial Weather StatementFWDFalls33 min
Mar 17, 7:43 PM CDTSpecial Weather StatementFWDRobertson32 min
Mar 17, 7:56 PM CDTSpecial Weather StatementFWDBell34 min
Mar 17, 8:00 PM CDTSevere Thunderstorm WarningFWDBell, Milam40 min
Mar 17, 8:16 PM CDTSpecial Weather StatementFWDLeon29 min
Mar 17, 9:15 PM CDTSpecial Weather StatementFWDMilam45 min
Mar 18, 12:01 AM CDTAreal Flood AdvisoryFWDAnderson, Leon119 min
Mar 18, 3:52 AM CDTFire Weather WatchFWDComanche, Coryell, Eastland, Erath, Hamilton, Lampasas and 4 more24 hr
Mar 18, 4:03 PM CDTSevere Thunderstorm WarningFWDMilam, Robertson57 min
Mar 18, 4:35 PM CDTSpecial Weather StatementFWDBosque40 min
Mar 18, 4:39 PM CDTSevere Thunderstorm WarningFWDBosque51 min
Mar 18, 4:54 PM CDTSevere Thunderstorm WarningFWDRobertson36 min
Mar 18, 5:14 PM CDTSevere Thunderstorm WarningFWDHill, Johnson61 min
Mar 18, 5:23 PM CDTSevere Thunderstorm WarningFWDBosque, Hill, McLennan67 min
Mar 18, 5:27 PM CDTTornado WarningFWDBosque, Hill33 min
Mar 18, 5:39 PM CDTSevere Thunderstorm WarningFWDMilam, Robertson66 min
Mar 18, 6:24 PM CDTSevere Thunderstorm WarningFWDHill, Limestone, McLennan, Navarro66 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.