Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 30, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 21, 1987, 6:53 PM CDT for Nowata County, Oklahoma. It was in force for 67 min.
The area
The counties it named.
The facts
- Issued
- May 21, 1987, 6:53 PM CDT (23:53 UTC)
- Expired
- May 21, 1987, 8:00 PM CDT
- In force
- 67 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Nowata 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 12:00Z, 11.9 hours before the alert went out and 162 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
- 1974 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 910 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KTUL 212353
SVRTUL
OKC113-147-105-220100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
653 PM CDT THU MAY 21 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHEAST OKLAHOMA
...EASTERN OSAGE...WASHINGTON...NORTHWEST NOWATA
AT 652 PM CDT THE TULSA RADAR WAS INDICATING TWO SEVERE THUNDERSTORMS
...ONE LOCATED 7 MILES WEST OF BARTLESVILLE OKLAHOMA...THE OTHER JUST
NORTHWEST OF SKIATOOK OKLAHOMA. OTHER STRONG STORMS WERE LOCATED
ACROSS EASTERN OSAGE COUNTY. STORM WERE MOVING TO THE NORTHEAST AT
ABOUT 20 MPH.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH,
LARGE HAIL, DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. R+EMEMBER,
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
KEEP TUNED TO THIS STATION FOR THE LATEST WEATHER BULLETINS.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
Special weather statement, May 21, 4:33 PM CDT, 2 hours 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA, OK 426 PM CDT THU MAY 21 1987 ...THUNDERSTORMS ARE FORMING ACROSS CENTRAL AND NORTHEAST OKLAHOMA... AT 4 20 PM THE TULSA WEATHER RADAR WAS INDICATING SCATTERED THUNDERSTORMS THAT HAD RAPIDLY DEVELOPED ALONG A COLD FRONT. THIS FRONT WAS LOCATED MIDWAY BETWEEN JOPLIN MO AND CHANUTE KS SOUTHWEST TO NEAR OKLAHOMA CITY. THIS FRONT WILL CONTINUE TO SLOWLY MOVE SOUTHEAST ACROSS THE NORTHEASTERN THIRD OF THE STATE THERE IS A GOOD CHANCE THAT THESE THUNDERSTORMS MAY BECOME SEVERE AND COULD PRODUCE TORNADOES LATER THIS EVENING. PERSONS PLANNING OUTDOOR ACTIVITIES THIS EVENING SHOULD KEEP IN MIND THAT SEVERE WEATHER IS LIKELY ...AND SHOULD BE PREPARED FOR SUCH AN EVENT. STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER UPDATES.
Special weather statement, May 21, 6:51 PM CDT, 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA, OK 644 PM CDT THU MAY 21 1987 ...THUNDERSTORM WARNING FOR TULSA..PAWNEE..AND CREEK COUNTIES CANCELLED.. THE THUNDERSTORMS THAT WERE APPROACHING TULSA FROM THE SOUTHWEST HAVE DECREASED IN INTENSITY...AND AS A RESULT THE SEVERE THUNDERSTORM WARNING THAT HAD BEEN IN EFFECT IS CANCELLED. AT 6 45 PM THE TULSA WEATHER RADAR CONTINUES TO SHOW VERY HEAVY THUNDER/ STORMS NORTHWEST OF TULSA IN OSAGE COUNTY. HEAVY THUNDERSTORMS CONTINUE TO DEVELOP SOUTHWEST OF TULSA...AND THE POSSIBILITY OF SEVERE WEATHER WILL REMAIN HIGH FOR THE NEXT SEVERAL HOURS IN NORTHEASTERN OKLAHOMA. THE SEVERE THUNDERSTORM WARNING FOR OSAGE COUNTY WILL REMAIN IN EF FECT UNTIL 7 PM. STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER INFORMATION. TEAGUE
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 5:06 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 54 min |
| May 21, 5:13 PM CDT | Severe Thunderstorm Warning | TSA | Creek | 62 min |
| May 21, 5:58 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 62 min |
| May 21, 5:58 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Pawnee, Tulsa | 46 min |
| May 21, 6:53 PM CDT | Severe Thunderstorm Warning | TSA | Osage, Washington | 67 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1987Every severe thunderstorm warning in 1987
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.