Alert archive / Texas / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 186

April 30, 20027 counties in Oklahoma; 12 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2002, 12:00 AM CDT for 7 counties in Oklahoma; 12 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2002, 12:00 AM CDT (05:00 UTC)
Expired
Apr 30, 2002, 5:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Jack County, TX, Montague County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 126 km from the middle of the area, began a volume at 05:01 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, 5.0 hours before the alert went out and 115 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 2002-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4268 joules per kilogram.LCLEL10008507005003002001001 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 2002-04-30The 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
4268 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1291 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
1.6
Supercell composite
10.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 7:30 PM CDTSevere Thunderstorm WatchSPCBryan, Jefferson, Love, Marshall5 hr

Nearby

Severe Thunderstorm Watches in Texas, 2002Severe Thunderstorm Watches in Oklahoma, 2002Every severe thunderstorm watch in 2002

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.