Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 3, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Mar 21, 1991, 11:40 AM CST for Cherokee County, Oklahoma. It was in force for 35 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, 11:40 AM CST (17:40 UTC)
- Expired
- Mar 21, 1991, 12:15 PM CST
- In force
- 35 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Cherokee County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 21, 11:45 AM CST | Hail 0.75 | Cherokee, 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, 5.7 hours before the alert went out and 154 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Local storm report, Mar 21, 11:34 AM CST, 6 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
1131 AM CST THU MAR 21 1991
TIME/CDT COUNTY EVENT
1110 AM DELAWARE DIME SIZE HAIL FELL 3 MILES NORTH OF COLCORD.
1118 AM ADAIR NICKLE SIZE HAIL FELL 4 MILES NORTH OF
WESTVILLE.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, 11:09 AM CST | Severe Thunderstorm Warning | TSA | Adair | 36 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 |
| Mar 21, 1:09 PM CST | Severe Thunderstorm Warning | TSA | Benton | 51 min |
| Mar 21, 4:14 PM CST | Severe Thunderstorm Warning | TSA | Crawford, Washington | 61 min |
| Mar 21, 4:58 PM CST | Severe Thunderstorm Warning | TSA | Madison | 62 min |
| Mar 21, 5:24 PM CST | Severe Thunderstorm Warning | TSA | Benton, Washington | 66 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.