Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS Norman, OK

March 25, 1997Lincoln County, Pottawatomie County, Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 25, 1997, 12:13 AM CST for Lincoln County, Pottawatomie County, Seminole County, Oklahoma. It was in force for 47 min. 2 reports came from 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, with what was reported inside it.

The facts

Issued
Mar 25, 1997, 12:13 AM CST (06:13 UTC)
Expired
Mar 25, 1997, 1:00 AM CST
In force
47 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Lincoln County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 40 km from the middle of the area, began a volume at 06:15 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.

What was reported inside it

TimeReportWhereRemark
Mar 25, 1:08 AM CSTHail 0.88Shawnee, OK
Mar 25, 1:08 AM CSTHail 0.88Shawnee, OK

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Mar 24, 7:45 PM CSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.2 hours before the alert went out and 54 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 1997-03-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1141 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, Norman, OK at 00:00Z on 1997-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
1141 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
1360 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
205 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 250614 RRA
SVROKC
OKC081-125-133-250700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1213 AM CST TUE MAR 25 1997

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 100 AM CST FOR PEOPLE IN
THE FOLLOWING COUNTIES

IN CENTRAL OKLAHOMA
     SOUTHERN LINCOLN...NORTHERN POTTAWATOMIE AND NORTHWESTERN
     SEMINOLE

INCLUDING THE FOLLOWING LOCATIONS
     MEEKER...PRAGUE AND SHAWNEE

AT 1213 AM CST DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6
MILES SOUTHWEST OF MEEKER.

THE STORM WAS MOVING EAST-NORTHEAST AT 40 MPH.

MOVE TO AN INTERIOR ROOM AWAY FROM WINDOWS AND ELECTRICAL
APPLIANCES.  HEAVY RAINS MTAY QUICKLY FLOOD ROADWAYS -- DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.


LAT...LON 3532  9662 3532  9705 3555  9705 3565  9663

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 24, 7:47 PM CSTSevere Thunderstorm WarningOUNAlfalfa33 min
Mar 24, 8:15 PM CSTSevere Thunderstorm WarningOUNMajor, Woods30 min
Mar 24, 8:35 PM CSTSevere Thunderstorm WarningOUNAlfalfa, Grant45 min
Mar 24, 8:48 PM CSTSevere Thunderstorm WarningOUNGarfield, Major32 min
Mar 24, 9:18 PM CSTSevere Thunderstorm WarningOUNGarfield, Grant42 min
Mar 24, 9:35 PM CSTSevere Thunderstorm WarningOUNKay40 min
Mar 24, 9:57 PM CSTSevere Thunderstorm WarningOUNGarfield, Noble48 min
Mar 24, 10:55 PM CSTSevere Thunderstorm WarningOUNLogan, Payne35 min
Mar 24, 11:14 PM CSTSevere Thunderstorm WarningOUNCleveland, Oklahoma31 min
Mar 24, 11:34 PM CSTSevere Thunderstorm WarningOUNLincoln, Pottawatomie41 min
Mar 24, 11:52 PM CSTSevere Thunderstorm WarningOUNOklahoma53 min
Mar 24, 11:58 PM CSTSevere Thunderstorm WarningOUNJefferson32 min
Mar 25, 12:30 AM CSTSevere Thunderstorm WarningOUNCarter, Jefferson45 min
Mar 25, 12:33 AM CSTSevere Thunderstorm WarningOUNCleveland, McClain, Pottawatomie42 min
Mar 25, 12:33 AM CSTSevere Thunderstorm WarningOUNGrady42 min
Mar 25, 1:15 AM CSTSevere Thunderstorm WarningOUNLincoln, Pottawatomie60 min
Mar 25, 1:15 AM CSTSevere Thunderstorm WarningOUNSeminole60 min
Mar 25, 1:15 AM CSTSevere Thunderstorm WarningOUNCleveland60 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1997Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.