Alert archive / Oklahoma / Flash Flood Warnings in 1990

Flash Flood Warning 5, NWS Norman, OK

April 15, 1990Atoka County, Coal County, Johnston County, Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 15, 1990, 5:23 PM CDT for Atoka County, Coal County, Johnston County, Oklahoma. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Apr 15, 1990, 5:23 PM CDT (22:23 UTC)
Expired
Apr 15, 1990, 7:30 PM CDT
In force
2 hr
Issued by
NWS Norman, OK
Area
Whole counties

Counties Atoka County, OK, Coal County, OK, Johnston 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

Norman, OK (KOUN), launched 12:00Z, 10.4 hours before the alert went out and 131 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 1990-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 1990-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 238 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1962 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
238 m²/s²
0-3 km storm-relative helicity
275 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 152223
FFWOKC
OKC005-029-069-160030-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
523 PM CDT SUN APR 15 1990
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  730 PM CDT
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN SOUTHEAST OKLAHOMA
 
   ...WESTERN ATOKA COUNTY...SOUTHWESTERN COAL COUNTY
   ...NORTHEASTERN JOHNSTON COUNTY
 
VERY HEAVY THUNDERSTORMS CONTINUE IN THE CLARITA BROMIDE AND WAPANUCKA
AREAS WITH RADAR NOW ESTIMATING UP TO 4 INCHES OF RAIN DURING THE PAST
1 TO 2 HOURS. EXPECT FLASH FLOODING ALONG DELAWARE AND GOOSE CREEKS
AND EVENTUALLY ALONG PARTS OF CLEAR BOGGY CREEK IN SOUTHWESTERN COAL
AND WESTERN ATOKA COUNTIES.
 
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NNEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

What forecasters said that day

The local office's own words before this flash flood 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 15, 1:16 PM CDT, 4 hours 7 minutes before
OKZALL-141200-
OKLAHOMA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
100 PM CDT SAT APR 14 1990

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
   TONIGHT OVER MUCH OF THE STATE SOUTHEAST OF A HOLLIS TO CLINTON TO
   VINITA LINE.

A COLD FRONT IS LOCATED FROM NEAR BARTLESVILLE TO CHILDRESS TEXAS.
BEHIND THE FRONT GUSTY NORTHEAST WINDS ARE BRINGING SLIGHTLY DRIER AND
COOLER AIR INTO THE NORTHWEST PORTION OF THE STATE. A WINDSHIFT LINE
IS MOVING SOUTHWARD THROUGH SOUTH CENTRAL AND SOUTHWEST OKLAHOMA WELL
AHEAD OF THE FRONT. THIS WINDSHIFT LINE DEVELOPED AS A RESULT OF
THUNDERSTORMS THAT OCCURRED MOST OF THE MORNING OVER THE NORTHEAST
PORTION OF THE STATE. A DRYLINE IS LOCATED FROM JUST EAST OF CHILDRESS
SOUTHWESTWARD INTO SOUTHWEST TEXAS. EAST OF THE DRYLINE VERY MOIST AIR
IS FLOWING NORTHWARD INTO OKLAHOMA. TEMPERATURES ARE WARMING RAPIDLY
AHEAD OF THE FRONT AND AHEAD OF THE WINDSHIFT LINE OVER THE
SOUTHWEST PORTION OF THE STATE.
<
WITH ADDITIONAL HEATING THIS AFTERNOON THUNDERSTORMS MAY DEVELOP OVER
THE SOUTHWEST PORTION OF THE STATE. IF THE THUNDERSTORMS DO DEVELOP THEY
WILL LIKELY BECOME SEVERE.

THE THUNDERSTORMS OCCURRING OVER NORTHEASTERN OKLAHOMA MAY INTENSIFY
THIS AFTERNOON AND BECOME SEVERE AS THEY MOVE SOUTHEAST.

CIVIL DEFENSE AND STORM SPOTTER GROUPS ACROSS THE AREA SHOULD REMAIN
ALERT AND BE READY FOR ACTIVITATION THIS AFTERNOON AND TONIGHT.
Local storm report, Apr 15, 4:07 PM CDT, 1 hour 16 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
405 PM CDT SUN APR 15 1990

TIME(CDT)    COUNTY           EVENT

351  PM      PONTOTOC         1 INCH HAIL AT FITTSTOWN
Special weather statement, Apr 15, 4:34 PM CDT, 49 minutes before
TXZ019-020-1522300

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
430 PM CDT SUN APR 15 1990

...A TORNADO WATCH IS IN EFFECT FOR HARDEMAN...FOARD...WILBARGER...
KNOX...BAYLOR...WICHITA...ARCHER...CLAY...JACK...MONTAGUE AND
YOUNG COUNTIES UNTIL 10 PM CDT...

AT 430 PM CDT WICHITA FALLS RADAR A VERY STRONG THUNDERSTORM NORTHEAST
OF ARDMORE MOVING TO THE SOUTHEAST AT 35 MPH. AT THIS TIME NO ACTIVITY
WAS OCCURRING IN THIS PORTION OF NORTH CENTRAL TEXAS.

A TORNADO WATCH MEANS CONDITIPNS ARE FAVORABLE FOR SEVERE STORMS AND
POSSIBLE TORNADOES TO DEVELOP IN OR CLOSE TO THE WATCH AREA. KEEP ABREAST
OF THE LATEST WEATHER CONDITIONS SHOULD SEVERE WEATHER DEVELOP IN THIS
AREA.~
Local storm report, Apr 15, 4:38 PM CDT, 45 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
437 PM CDT SUN APR 15 1990

TIME(CDT)    COUNTY           EVENT

435  PM      COAL             GOLFBALL-SIZED HAIL IN CLARITA

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 3:47 PM CDTSevere Thunderstorm WarningOUNCoal, Pontotoc43 min
Apr 15, 4:27 PM CDTSevere Thunderstorm WarningOUNCoal48 min
Apr 15, 4:52 PM CDTSevere Thunderstorm WarningOUNAtoka, Johnston38 min
Apr 15, 5:34 PM CDTSevere Thunderstorm WarningOUNAtoka, Johnston56 min
Apr 15, 5:42 PM CDTSevere Thunderstorm WarningOUNJefferson48 min
Apr 15, 6:28 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Johnston62 min
Apr 15, 6:32 PM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love43 min

Nearby

Flash Flood Warnings in Oklahoma, 1990Every flash flood 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.