Alert archive / Oklahoma / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 151

April 10, 199732 counties in Oklahoma; Hardeman County, Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 10, 1997, 8:15 PM CDT for 32 counties in Oklahoma; Hardeman County, Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 10, 1997, 8:15 PM CDT (01:15 UTC)
Expired
Apr 11, 1997, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 33 counties

Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Hughes County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Tillman County, OK, Washita County, OK, Hardeman County, TX

The radar

The Norman radar (KTLX), 106 km from the middle of the area, began a volume at 01:16 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

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

IssuedProductOfficeCountiesLasted
Apr 11, 1:58 AM CDTFlash Flood WarningTSAOsage3 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.3 hours before the alert went out and 101 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, Norman, OK at 00:00Z on 1997-04-11Temperature 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, Norman, OK at 00:00Z on 1997-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1196 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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 11, 3:00 AM CDTTornado WatchSPCLove6 hr
Apr 10, 8:45 PM CDTTornado WatchSPCAndrews, Borden, Briscoe, Castro, Childress, Coke and 36 more6 hr
Apr 11, 9:30 AM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Bastrop, Bell, Brazos, Burleson and 28 more6 hr
Apr 11, 2:30 PM CDTTornado WatchSPCAustin, Brazoria, Calhoun, Chambers, Colorado, Fayette and 18 more6 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 1997Severe Thunderstorm Watches in Texas, 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.