Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 55, NWS Tulsa, OK

April 21, 1990Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 21, 1990, 4:45 PM CDT for Washington County, Oklahoma. It was in force for 60 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: Apr 21, 1990, 4:45 PM CDT (21:45 UTC)
Expired: Apr 21, 1990, 5:45 PM CDT
In force: 60 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Washington 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
Apr 21, 5:21 PM CDT	Hail 0.88	Washington, 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, 9.8 hours before the alert went out and 188 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1521 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KTUL 212146
SVRTUL
OKC147-212245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
445 PM CDT SAT APR 21 1990
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  545 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES ...
 
IN NORTHEAST OKLAHOMA
 
   ...NORTHERN WASHINGTON COUNTY
 
AT 443 PM CDT WEATHER RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES
NORTHWEST OF COPAN, OK MOVING EAST SOUTHEAST AT 10 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.

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, Apr 21, 11:46 AM CDT, 4 hours 59 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
1145 AM CDT SAT APR 21 1990

...REPORTS FROM EVENING OF APRIL 20 1990...

TIME(CDT)   COUNTY           EVENT

640 PM      TULSA        DIME SIZE HAIL REPORTED BY SPERRY CD

705-710 PM  TULSA        NUMEROUS REPORTS OF WALL CLOUD SOUTH OF OWASSO

720 PM      ROGERS       DIME SIZE HAIL IN VERDIGRIS

748 PM      TULSA        SPOTTER REPORTS WIND GUST TO 76 MPH AT
                         RESERVOIR HILL

750 PM      TULSA        65 MPH WINDS AND NICKEL SIZED HAIL NEAR
                         DOWNTOWN TULSA

755 PM      TULSA        3/4 INCH HAIL REPORTED AT PINE AND U.S. 75

805 PM      TULSA        SPOTTER REPORTS WALL CLOUD AT 41ST AND PzEORIA

835 PM      ROGERS       DIME SIZE HAIL NEAR TIAWAH

Special weather statement, Apr 21, 4:13 PM CDT, 32 minutes before

OKZ007-008-012-212215-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
410 PM CDT SAT APR 21 1990

...STRONG THUNDERSTORMS DEVELOPING IN NORTHEAST OKLAHOMA...

SEVERAL STRONG THUNDERSTORMS WITH VERY HEAVY RAIN HAVE DEVELOPED IN
NORTHEAST OKLAHOMA. AT 400 PM THE NATIONAL WEATHER SERVICE RADAR
INDICATED DEVELOPING STRONG THUNDERSTORMS IN EXTREME NORTHEAST OSAGE
COUNTY EAST OF HULAH RESERVOIR...IN CENTRAL OSAGE COUNTY 3 MILES NORTH
OF BARNSDALL...IN WESTERN TULSA COUNTY WEST OF SAND SPRINGS...AND IN
CENTRAL PAWNEE COUNTY MIDWAY BETWEEN PAWNEE AND CLEVELAND. THESE
STORMS HAVE FORMED IN THE MOIST UNSTABLE AIR IN THE VICINITY OF A WEAK
SURFACE TROUGH OF LOW PRESSURE. AT THIS TIME THE STORMS ARE CAPABLE OF
PRODUCING HEAVY RAIN AND BRIEF GUSTY WINDS AS THEY MOVE TO THE
EAST SOUTHEAST AT AROUND 10 MPH.

THE STORMS ARE EXPECTED TO INTENSIFY THIS AFTERNOON WITH A FEW STORMS
REACHING SEVERE LEVELS. THE STORMS THAT BECOME SEVERE WILL BE CAPABLE
OF PRODUCING LARGE HAIL AND WINDS IN EXCESS OF 60 MPH. FLASH FLOODING
WILL ALSO BE A THREAT TO THE AREAS THAT RECEIVE THE RAINFALL FROM THE
STRONGER STORMS BECAUSE OF SLOW STORM MOVEMENT AND SATURATED GROUNDS.
A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF NORTHEAST
OKLAHOMA UNTIL 9 PM.

STAY TUNED TO NOAA WEATHER RADIO OR COMMERCIAL RADIO OR TELEVISION FOR
LATER UPDATES OR POSSIBLE WARNINGS.

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 7:46 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	59 min
Apr 20, 8:26 PM CDT	Flash Flood Warning	TSA	Tulsa	2 hr
Apr 21, 5:22 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa	68 min
Apr 21, 6:13 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	62 min
Apr 21, 6:23 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	67 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1990 Every 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.