Alert archive / Texas / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 162

April 20, 199711 counties in Oklahoma; 31 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 1997, 5:45 PM CDT for 11 counties in Oklahoma; 31 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 20, 1997, 5:45 PM CDT (22:45 UTC)
Expired
Apr 20, 1997, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 42 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pushmataha County, OK, Bosque County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 60 km from the middle of the area, began a volume at 22:47 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.

Warnings issued inside it

26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 20, 6:41 PM CDTSevere Thunderstorm WarningFWDMontague64 min
Apr 20, 6:55 PM CDTSevere Thunderstorm WarningOUNCarter, Murray50 min
Apr 20, 7:00 PM CDTSevere Thunderstorm WarningOUNJefferson45 min
Apr 20, 7:10 PM CDTSevere Thunderstorm WarningOUNCoal, Pontotoc50 min
Apr 20, 7:24 PM CDTSevere Thunderstorm WarningFWDWise66 min
Apr 20, 7:35 PM CDTSevere Thunderstorm WarningOUNJohnston55 min
Apr 20, 7:43 PM CDTSevere Thunderstorm WarningOUNCarter47 min
Apr 20, 7:47 PM CDTSevere Thunderstorm WarningFWDDenton58 min
Apr 20, 7:58 PM CDTSevere Thunderstorm WarningOUNCoal47 min
Apr 20, 8:13 PM CDTSevere Thunderstorm WarningFWDTarrant62 min
Apr 20, 8:20 PM CDTSevere Thunderstorm WarningOUNAtoka55 min
Apr 20, 8:25 PM CDTSevere Thunderstorm WarningFWDHood, Palo Pinto, Parker65 min
Apr 20, 8:25 PM CDTSevere Thunderstorm WarningFWDErath65 min
Apr 20, 8:27 PM CDTSevere Thunderstorm WarningOUNJohnston48 min
Apr 20, 8:41 PM CDTSevere Thunderstorm WarningFWDDenton, Wise34 min
Apr 20, 8:57 PM CDTSevere Thunderstorm WarningFWDJohnson63 min
Apr 20, 8:59 PM CDTSevere Thunderstorm WarningFWDDallas61 min
Apr 20, 9:12 PM CDTSevere Thunderstorm WarningOUNAtoka, Pushmataha63 min
Apr 20, 9:15 PM CDTSevere Thunderstorm WarningFWDTarrant45 min
Apr 20, 9:25 PM CDTSevere Thunderstorm WarningFWDSomervell35 min
Apr 20, 9:39 PM CDTSevere Thunderstorm WarningFWDParker36 min
Apr 20, 9:44 PM CDTSevere Thunderstorm WarningFWDBosque61 min
Apr 20, 9:48 PM CDTFlash Flood WarningFWDTarrant117 min
Apr 20, 9:51 PM CDTSevere Thunderstorm WarningFWDErath54 min
Apr 20, 9:55 PM CDTSevere Thunderstorm WarningFWDEllis65 min
Apr 20, 10:15 PM CDTSevere Thunderstorm WarningOUNChoctaw45 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.8 hours before the alert went out and 45 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 1997-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 107 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 1997-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.1939Sfc1 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
107 J/kg
Mixed-layer CIN
-425 J/kg
Mixed-layer LCL
1341 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 3:45 PM CDTTornado WatchSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 7 more6 hr
Apr 20, 5:30 PM CDTSevere Thunderstorm WatchSPCBandera, Blanco, Brown, Burnet, Concho, Coryell and 18 more6 hr

Nearby

Severe Thunderstorm Watches in Texas, 1997Severe Thunderstorm Watches in Oklahoma, 1997Every severe thunderstorm watch in 1997

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.