Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 21, NWS Fort Worth, TX

February 24, 2001Rockwall County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Feb 24, 2001, 11:12 AM CST for Rockwall County, Texas. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Feb 24, 2001, 11:12 AM CST (17:12 UTC)
Expired
Feb 24, 2001, 12:00 PM CST
In force
48 min
Issued by
NWS Fort Worth, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Rockwall County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 90 km from the middle of the area, began a volume at 17:15 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
Feb 24, 7:15 AM CSTTornado WatchSPC6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 5.2 hours before the alert went out and 80 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 2001-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1959 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 12:00Z on 2001-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 364 square meters per square second.1939587897117136Sfc1 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
1959 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
668 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
364 m²/s²
0-3 km storm-relative helicity
481 m²/s²
Significant tornado parameter
4.6
Supercell composite
18.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KFWD 241712
SVRFTW
TXC397-241800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
1112 AM CST SAT FEB 24 2001

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ROCKWALL COUNTY IN NORTH CENTRAL TEXAS

* UNTIL NOON CST

* AT 1112 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF ROCKWALL...OR ABOUT 2
  MILES SOUTH OF ROWLETT...MOVING EAST AT 65 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ROYSE CITY AROUND 1120 AM CST

DAMAGING WINDS IN EXCESS OF 60 MPH ARE LIKELY WITH THIS STORM. TAKE
COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNING AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO WARNING.

LAT...LON 3299 9653 3284 9653 3287 9628 3298 9633

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 23, 7:20 PM CSTFlash Flood WarningFWDParker115 min
Feb 24, 6:57 AM CSTSevere Thunderstorm WarningFWDFannin48 min
Feb 24, 8:39 AM CSTSevere Thunderstorm WarningFWDComanche51 min
Feb 24, 9:05 AM CSTSevere Thunderstorm WarningFWDMontague, Wise55 min
Feb 24, 9:27 AM CSTSevere Thunderstorm WarningFWDHood, Parker63 min
Feb 24, 9:42 AM CSTSevere Thunderstorm WarningFWDCooke48 min
Feb 24, 9:59 AM CSTSevere Thunderstorm WarningFWDTarrant61 min
Feb 24, 10:07 AM CSTSevere Thunderstorm WarningFWDDenton53 min
Feb 24, 10:21 AM CSTSevere Thunderstorm WarningFWDGrayson39 min
Feb 24, 10:26 AM CSTSevere Thunderstorm WarningFWDCollin, Dallas64 min
Feb 24, 10:35 AM CSTSevere Thunderstorm WarningFWDJohnson55 min
Feb 24, 11:04 AM CSTSevere Thunderstorm WarningFWDFannin, Hunt56 min
Feb 24, 11:59 AM CSTSevere Thunderstorm WarningFWDDelta, Lamar61 min
Feb 24, 11:59 AM CSTSevere Thunderstorm WarningFWDHunt61 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm warning in 2001

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.