Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 170, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 27, 1990, 12:56 AM CDT for LeFlore County, Sequoyah County, Oklahoma. It was in force for 64 min.
The area
The counties it named.
The facts
- Issued
- May 27, 1990, 12:56 AM CDT (05:56 UTC)
- Expired
- May 27, 1990, 2:00 AM CDT
- In force
- 64 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
Counties LeFlore County, OK, Sequoyah County, OK
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Springfield, MO (KUMN), launched 00:00Z, 5.9 hours before the alert went out and 207 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
- 4 J/kg
- Mixed-layer CIN
- -500 J/kg
- Mixed-layer LCL
- 1116 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSM 270557 SVRFSM OKC135-079-270700- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FORT SMITH AR 1256 AM CDT SUN MAY 27 1990 THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 200 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN NORTHEAST OKLAHOMA ...SEQUOYAH COUNTY IN SOUTHEAST OKLAHOMA ...LE FLORE COUNTY AT 1255 AM CDT FORT SMITH RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 20 SOUTHEAST OF MUSKOGEE TO 30 EAST OF MCALESTER OKLAHOMA MOVING EAST AT 45 MPH. NUMEROUS TREES DOWN AND GUSTS IN EXCESS OF 60 MPH AS IT PASSED THROUGH HASKELL AND LATIMER COUNTIES SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INFTO AREAS WHERE WATER COVERS THE ROAD.
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, May 26, 11:51 PM CDT, 1 hour 5 minutes before
STORM REPORT NATIONAL WEATHER SERVICE TULSA, OK 1150 PM CDT SAT MAY 26 1990 TIME/CDT COUNTY EVENT 2245 PM CREEK DIME SIZE HAIL AT JUST SOUTH OF BRISTOW 2300 PM OKMULGEE DIME SI?ZE HAIL NORTHWEST OF HENRYETTA
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 10:15 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 45 min |
| May 26, 10:31 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Okmulgee | 44 min |
| May 27, 12:13 AM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Pittsburg | 47 min |
| May 27, 12:28 AM CDT | Severe Thunderstorm Warning | TSA | Haskell | 47 min |
| May 27, 3:43 AM CDT | Severe Thunderstorm Warning | TSA | Okfuskee | 62 min |
| May 27, 4:08 AM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Okmulgee | 67 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; the sounding from the Mesonet's radiosonde archive.