Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 2, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Mar 21, 1991, 11:09 AM CST for Adair County, Oklahoma. It was in force for 36 min. 1 report 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
- Mar 21, 1991, 11:09 AM CST (17:09 UTC)
- Expired
- Mar 21, 1991, 11:45 AM CST
- In force
- 36 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Adair County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 21, 11:18 AM CST | Hail 0.88 | Adair, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Springfield, MO (KUMN), launched 12:00Z, 5.2 hours before the alert went out and 137 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.
- Mixed-layer CAPE
- 276 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 224 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 211709 SVRTUL OKC001-211745- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 1109 AM CST THU MAR 21 1991 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1145 AM CST FOR PEOPLE IN THE FOLLOWING COUNTIES ... IN EAST CENTRAL OKLAHOMA ...ADAIR COUNTY AT 1106 AM CST RADAR INDICATED TWO SEVERE THUNDERSTORMS IN NORTHERN DELAWARE COUNTY. ONE WAS JUST NORTH OF PROCTOR AND JUST WEST OF BARON MOVING TOWARD THE NORTHEAST AT 45 MPH. PERSONS IN WESTVILLE AND WATTS ARE IN THE PATH OF THESE STORMS. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 10:55 AM CST | Severe Thunderstorm Warning | TSA | Delaware | 35 min |
| Mar 21, 11:40 AM CST | Severe Thunderstorm Warning | TSA | Cherokee | 35 min |
| Mar 21, 12:22 PM CST | Severe Thunderstorm Warning | TSA | Cherokee | 38 min |
| Mar 21, 1:46 PM CST | Severe Thunderstorm Warning | TSA | Creek | 44 min |
| Mar 21, 2:00 PM CST | Severe Thunderstorm Warning | TSA | Pittsburg | 60 min |
| Mar 21, 2:11 PM CST | Severe Thunderstorm Warning | TSA | Okfuskee, Okmulgee | 49 min |
| Mar 21, 2:32 PM CST | Tornado Warning | TSA | McIntosh, Pittsburg | 43 min |
| Mar 21, 2:44 PM CST | Severe Thunderstorm Warning | TSA | Tulsa | 46 min |
| Mar 21, 3:17 PM CST | Severe Thunderstorm Warning | TSA | Muskogee | 28 min |
| Mar 21, 3:26 PM CST | Severe Thunderstorm Warning | TSA | Mayes, Rogers | 49 min |
| Mar 21, 3:34 PM CST | Severe Thunderstorm Warning | TSA | Sequoyah | 56 min |
| Mar 21, 3:49 PM CST | Severe Thunderstorm Warning | TSA | Creek | 41 min |
| Mar 21, 4:02 PM CST | Severe Thunderstorm Warning | TSA | Adair | 43 min |
| Mar 21, 4:25 PM CST | Severe Thunderstorm Warning | TSA | McIntosh | 50 min |
| Mar 21, 4:33 PM CST | Severe Thunderstorm Warning | TSA | Cherokee, Muskogee | 42 min |
| Mar 21, 5:05 PM CST | Severe Thunderstorm Warning | TSA | Adair | 40 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1991Every severe thunderstorm warning in 1991
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.