Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 130, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 20, 1990, 9:29 PM CDT for Ottawa County, Oklahoma. It was in force for 46 min. 2 reports 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
- May 20, 1990, 9:29 PM CDT (02:29 UTC)
- Expired
- May 20, 1990, 10:15 PM CDT
- In force
- 46 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Ottawa County, OK
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 9:35 PM CDT | Hail 1 | Ottawa, OK | |
| May 20, 9:50 PM CDT | Hail 1 | Ottawa, 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 00:00Z, 2.5 hours before the alert went out and 90 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
- 2299 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1348 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 210229 SVRTUL OKC115-210315- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 929 PM CDT SUN MAY 20 1990 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1015 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES ... IN NORTHEAST OKLAHOMA ...NORTHEASTERN OTTAWA COUNTY AT 9 27 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTH OF QUAPAW MOVING SOUTHEAST AT 25 MPH. QUAPAW AND PEORIA ARE IN THE PATH OF THIS STORM. QUARTER SIZE HAIL HAS BEEN REPORTED WITH THIS STORM. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER... SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADO ES WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 11:26 PM CDT | Severe Thunderstorm Warning | TSA | Delaware | 34 min |
| May 20, 11:32 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 58 min |
| May 21, 12:28 AM CDT | Flash Flood Warning | TSA | LeFlore | 3 hr |
| May 21, 12:39 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 66 min |
| May 21, 2:27 AM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Muskogee | 48 min |
| May 21, 2:32 AM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 58 min |
| May 21, 2:36 AM CDT | Severe Thunderstorm Warning | TSA | Adair | 39 min |
| May 21, 3:27 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore, Sequoyah | 63 min |
| May 21, 4:28 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 62 min |
| May 21, 5:27 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 63 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1990Every severe thunderstorm warning in 1990
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.