Alert archive / Oklahoma / Tornado Warnings in 1990
Tornado Warning 15, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Apr 9, 1990, 6:12 PM CDT for Harper County, Oklahoma. It was in force for 33 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 9, 1990, 6:12 PM CDT (23:12 UTC)
- Expired
- Apr 9, 1990, 6:45 PM CDT
- In force
- 33 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Harper 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 9, 6:25 PM CDT | Hail 0.88 | Harper, 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
Dodge City, (KDDC), launched 12:00Z, 11.2 hours before the alert went out and 111 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1469 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 214 m²/s²
- 0-3 km storm-relative helicity
- 248 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 KOKC 092315 TOROKC OKC059-092345- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 612 PM CDT MON APR 9 1990 THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 645 PM CDT FOR THE FOLLOWING OKLAHOMA LOCATIONS... IN NORTHWEST OKLAHOMA ...HARPER COUNTY AT 612 PM CDT RADAR INDICATED A TORNADO 10 MILES SOUTH OF BUFFALO MOVING TO THE EAST AT 20 MPH. THIS IS A DANGEROUS STORM AND YOU SHOULD TAKE COVER AS IT APPROACHES. DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.
What forecasters said that day
The local office's own words before this tornado 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, Apr 9, 1:06 PM CDT, 5 hours 6 minutes before
OKZALL-101200- OKLAHOMA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 100 PM CDT MON APR 9 1990 ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT FOR WESTERN OKLAHOMA...EXCLUDING THE PANHANDLE...WEST OF A LINE FROM MARIETTA TO BLACKWELL... ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR EASTERN OKLAHOMA... EAST OF A LINE FROM MARIETTA TO BLACKWELL... RICH MOISTURE CONTINUED TO STREAM NORTHWARD TODAY WITH THE MAIN AXIS OF MOISTURE ACROSS CENTRAL OKLAHOMA. A DRY LINE WAS ESTABLISHED FROM KANSAS SOUTH ACROSS THE TEXAS PANHANDLE. WIDESPREAD CLOUDINESS OVER MUCH OF THE STATE PERSISTED THROUGH THIS MORNING AND WAS SLOWLY DISSIPATING OVER NORTHWESTERN SECTIONS. A VIGOROUS UPPER LEVEL SYSTEM WAS LOCATED OVER WESTERN COLORADO AND ARIZONA AND WAS MOVING EASTWARD. A COLD FRONT WAS LOCATED OVER NORTHWESTERN KANSAS MOVING SOUTHWARD. AS THE UPPER LEVEL SYSTEM APPROACHES OKLAHOMA FROM THE WEST AND ENCOUNTERS THE DRY LINE...THUNDERSTORMS WILL DEVELOP OVER WESTERN SECTIONS OF THE STATE. CURRENT INFORMATION INDICATES THAT THE STORMS OVER THE WESTERN PORTIONS OF THE STATE COULD PRODUCE LARGE HAIL AND TORNADOES. THESE STORMS ARE EXPECTED TO DEVELOP EARLY THIS AFTERNOON. AS THE UPPER LEVEL SYSTEM MOVES EASTWARD AND THE FRONT MOVES SOUTHWARD... THUNDERSTORMS WILL MOVE EASTWARD ACROSS THE STATE. THE ACTIVITY WILL CONTINUE INTO THE NIGHTTIME HOURS WITH PRESENT INDICATIONS THAT THE EASTERN HALF OF THE STATE CAN EXPECT MAINLY LARGE HAIL AND HEAVY RAINFALL. WITH THE FRONTAL BOUNDARY MOVING ACROSS THE STATE AND LOCATED OVER EASTERN SECTIONS...THUNDERSTORMS MAY REPEATEDLY MOVE OVER THE SAME AREAS...CAUSING LOCALIZED FLASH FLOODING. SPOTTER GROUPS AND CIVIL DEFENSE AGENCIES OVER MOST SECTIONS OF THE STATE EXCEPT THE PANHANDLE SHOULD BE ALERT AND PREPARED FOR ACTIVATION LATER THIS AFTERNOON AND TONIGHT.
Special weather statement, Apr 9, 3:40 PM CDT, 2 hours 32 minutes before
TXZALL-092145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 340 PM CDT MON APR 9 1990 ...TORNADO WATCH HAS BEEN ISSUED FOR PARTS OF SOUTHWEST AND SOUTH CENTRAL OKLAHOMA AND A LARGE PORTION OF NORTHWEST TEXAS UNTIL 10 PM CDT THIS MONDAY EVENING... COUNTIES INCLUDED IN THIS PORTION OF NORTH CENTRAL TEXAS INCLUDE ARCHER..BAYLOR..CLAY..FOARD..HARDEMAN..JACK..KNOX..WICHITA..WILBARGER.AND YOUNG. THIS INCLUDES COTTON COUNTY OF SOUTHWESTERN OKLAHOMA. AT 330 PM CDT RADAR INDICATED AN AREA OF RAPIDLY DEVELOPING THUNDERSTORMS IN SOUTHWESTERN OKLAHOMA FROM NORTH OF CHILDRESS TEXAS NORTHEASTWARD TO OKLAHOMA CITY. MOVEMENT WAS NORTHEAST AT 30 MPH. NO THUNDERSTORMS WERE INDICATED ON RADAR IN THIS PORTION OF NORTH CENTRAL TEXAS BUT ARE EXPECTED TO FORM AND BUILD RAPIDLY THIS AFTERNOON AND EVENING. REMEMBER A TORNADO WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
Special weather statement, Apr 9, 4:42 PM CDT, 1 hour 30 minutes before
TXZALL-092245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 442 PM CDT MON APR 9 1990 ...TORNADO WATCH IS IN EFFECT UNTIL 10 PM CDT THIS MONDAY EVENING FOR A LARGE PORTION OF NORTHWESTERN TEXAS AND PORTIONS OF SOUTHWESTERN AND SOUTH CENTRAL OKLAHOMA... AT 430 PM CDT RADAR INDICATED THUNDERSTORMS WERE RAPIDLY FORMING ACROSS THE AREA. IN OKLAHOMA THE STRONGEST THUNDERSTORM WAS NEAR DUNCAN. IN TEXAS THUNDERSTORMS WERE DEVELOPING FROM SOUTHWEST OF WICHITA FALLS TO ABILENE. THE STRONGEST THUNDERSTORMS WERE ENTERING SOUTHERN ARCHER COUNTY AND SHOULD MOVE SOUTHEAST OF ARCHER CITY. MOVEMENT WAS NORTHEAST AT 25 MPH. REMEMBER A TORNADO WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS TO DEVELOP IN AND NEAR THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE ALERT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS OR POSSIBLE WARNINGS.
Special weather statement, Apr 9, 5:34 PM CDT, 38 minutes before
TXZALL-092330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 534 PM CDT MON APR 9 1990 ...TORNADO WATCH IS IN EFFECT UNTIL 10 PM CDT THIS MONDAY AFTERNOON AND EVENING FOR THIS PORTION OF NORTH CENTRAL TEXAS AND SOUTHWESTERN OKLAHOMA... AT 530 CDT RADAR INDICATED A FEW THUNDERSHOWERS..DECREASING IN INTENSITY..ACROSS YOUNG AND SOUTHERN ARCHER COUNTIES. IN OKLAHOMA VERY STRONG THUNDERSTORMS WERE WELL NORTHEAST OF WIICHITA FALLS FROM ALEX TO PURCELL. MOVEMENT WAS NORTHEAST AT 25 MPH. REMEMBER A TORNADO WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS TO DEVELOP IN AND NEAR THE WATCH AREA. BE ALERT TO THREATENING WEATHER CONDITIO@NS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 5:39 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 51 min |
| Apr 9, 5:55 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 50 min |
| Apr 9, 6:28 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 62 min |
Nearby
Tornado Warnings in Oklahoma, 1990Every tornado warning in 1990Tornadoes 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.