Alert archive / Texas / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 49, NWS Fort Worth, TX

January 21, 1998Collin County, Dallas County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jan 21, 1998, 4:01 PM CST for Collin County, Dallas County, Texas. It was in force for 59 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jan 21, 1998, 4:01 PM CST (22:01 UTC)
Expired
Jan 21, 1998, 5:00 PM CST
In force
59 min
Issued by
NWS Fort Worth, TX
Area
Whole counties

Counties Collin County, TX, Dallas County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 74 km from the middle of the area, began a volume at 22:04 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.

What was reported inside it

TimeReportWhereRemark
Jan 21, 4:05 PM CSTHail 1Garland, TX
Jan 21, 4:10 PM CSTHail 1.5Richardson, TX
Jan 21, 4:25 PM CSTHail 1Murphy, TX

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.0 hours before the alert went out and 60 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 1998-01-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 45 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 1998-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.19395878Sfc1 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
45 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
500 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

998 
WUUS1 KFTW 212204 RRA
SVRFTW
TXC085-113-212300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
401 PM CST WED JAN 21 1998
 
THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  500 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL TEXAS
 
   ...COLLIN COUNTY...NORTHERN DALLAS COUNTY
 
AT 403 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A SEVERE
THUNDERSTORM NEAR RICHARDSON. MOVEMENT WAS NORTHEAST AT 25 TO 30 MPH.
WYLIE AND LAKE LAVON ARE IN THE PATH OF THIS STORM.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...YOU SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DONT USE TELEPHONES
OR ELECTRICAL APPLIANCES UNTIL THE STORM HAS PASSED.  DO NOT DRIVE
INTO WATER CROSSING ROADWAYS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 21, 12:44 PM CSTSevere Thunderstorm WarningFWDEllis46 min
Jan 21, 1:00 PM CSTSevere Thunderstorm WarningFWDHenderson, Van Zandt60 min
Jan 21, 1:09 PM CSTSevere Thunderstorm WarningFWDKaufman66 min
Jan 21, 2:33 PM CSTSevere Thunderstorm WarningFWDMilam42 min
Jan 21, 2:42 PM CSTSevere Thunderstorm WarningFWDBell, Falls63 min
Jan 21, 3:00 PM CSTSevere Thunderstorm WarningFWDRobertson60 min
Jan 21, 3:14 PM CSTSevere Thunderstorm WarningFWDMilam61 min
Jan 21, 3:53 PM CSTTornado WarningFWDRobertson52 min
Jan 21, 4:15 PM CSTTornado WarningFWDLeon45 min
Jan 21, 4:46 PM CSTSevere Thunderstorm WarningFWDEllis59 min
Jan 21, 4:58 PM CSTTornado WarningFWDLeon62 min
Jan 21, 5:22 PM CSTSevere Thunderstorm WarningFWDKaufman68 min
Jan 21, 5:34 PM CSTFlash Flood WarningFWDLeon, Robertson4 hr

Nearby

Severe Thunderstorm Warnings in Texas, 1998Every severe thunderstorm warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.