Alert archive / Oklahoma / Flash Flood Warnings in 1989

Flash Flood Warning 15, NWS Tulsa, OK

August 20, 1989Osage County, Washington County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Aug 20, 1989, 12:49 PM CDT for Osage County, Washington County, Oklahoma. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 20, 1989, 12:49 PM CDT (17:49 UTC)
Expired
Aug 20, 1989, 3:45 PM CDT
In force
3 hr
Issued by
NWS Tulsa, OK
Area
Whole counties

Counties Osage County, OK, Washington 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, 5.8 hours before the alert went out and 197 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 1989-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1245 joules per kilogram.LCLLFCEL10008507005003002001001 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 1989-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 square meters per square second.193958Sfc1 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
1245 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
1069 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
224 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Aug 20, 7:39 AM CDT, 5 hours 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA, OK
739 AM CDT SUN AUG 20 1989

    ...FLOODING POTENTIAL FOR PARTS OF NORTHEAST OKLAHOMA REMAINS
                       HIGH TODAY...

SOME AREAS OF NORTHEAST OKLAHOMA RECEIVED OVER 4 INCHES OF RAIN OVER/
NIGHT...WITH THE TULSA METRO AREA LEADING THE WAY WITH OVER 5 INCHES
... 5.25 INCHES IN SIX HOURS. HEAVY RAINFALL IN EASTERN OSAGE...
NORTHERN WASHINGTON...AND NORTHERN NOWATA COUNTIES PRODUCED FLASH
FLOODING THERE SHORTLY AFTER MIDNIGHT.

THE GROUND OVER MOST OF NORTHEAST OKLAHOMA IS TOTALLY SATURATED
...AND ANY ADDITIONAL RAINFALL WILL RUN OFF QUICKLY. WITH THIS IN
MIND...A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS AFTERNOON FOR
ALL OF NORTH-CENTRAL AND NORTHEAST OKLAHOMA. THE WATCH AREA IS NORTH
OF A LINE FROM ALVA TO HENRYETTA TO SALLISAW.

A LARGE THUNDERSTORM COMPLEX IN SOUTHERN KANSAS IS MOVING EAST-SOUTH/
EAST AND COULD MOVE INTO NORTHEAST OKLAHOMA LATER THIS MORNING. IF THIS
OCCURS...ADDITIONAL FLOODING IS LIKELY ESPECIALLY OVER PREVIOUSLY
RAIN-SOAKED AREAS. PERSONS LIVING ALONG CREEKS AND RIVERS...LOW-
LYING FIELDS AND PASTURE LANDS...AND NORMALLY FLOOD PRONE AREAS
SHOULD BE ALERT TO THE POSSIBILITY OF FLOODING LATER TODAY.

THIS IS A POTENTIALLY DANGEROUS FLOOD EVENT...AND NECESSARY PRE/
CAUTIONS SHOULD BE TAKEN NOW TO ENSURE THAT A SWIFT EVACUATION
TO HIGHER GROUND COULD BE DONE IN A SHORT TIME IF NECESSARY LATER
TODAY. FINALLY...REMEMBER THAT MOST FLASH-FLOOD DEATHS OCCUR IN
AUTOMOBILES. UNDER ANY CIRCUMSTANCES...DO NOT DRIVE INTO ANY AREAS
WHERE FLOOD WATERS EXIT. ROADBEDS ARE EASILY WASHED AWAY IN
SITUATIONS LIKE THIS...AND THE DEPTH OF WATERS FLOWING OVER THE
ROADWAY CANNOT BE DETERMINED. IF YOU BECOME STRANDED IN YOUR
CAR IN RISING FLOOD WATERS...ABANDON IT IMMEDIATELY.
Special weather statement, Aug 20, 7:47 AM CDT, 5 hours 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA, OK
746 AM CDT SUN AUG 20 1989

    ...FLOODING POTENTIAL FOR PARTS OF NORTHEAST OKLAHOMA REMAINS
                       HIGH TODAY...

SOME AREAS OF NORTHEAST OKLAHOMA RECEIVED OVER 4 INCHES OF RAIN OVER/
NIGHT...WITH THE TULSA METRO AREA LEADING THE WAY WITH OVER 5 INCHES
... 5.25 INCHES IN SIX HOURS. HEAVY RAINFALL IN EASTERN OSAGE...
NORTHERN WASHINGTON...AND NORTHERN NOWATA COUNTIES PRODUCED FLASH
FLOODING THERE SHORTLY AFTER MIDNIGHT.

THE GROUND OVER MOST OF NORTHEAST OKLAHOMA IS TOTALLY SATURATED
...AND ANY ADDITIONAL RAINFALL WILL RUN OFF QUICKLY. WITH THIS IN
MIND...A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS AFTERNOON FOR
ALL OF NORTH-CENTRAL AND NORTHEAST OKLAHOMA. THE WATCH AREA IS NORTH
OF A LINE FROM ALVA TO HENRYETTA TO SALLISAW.

A LARGE THUNDERSTORM COMPLEX IN SOUTHERN KANSAS IS MOVING EAST-SOUTH/
EAST AND COULD MOVE INTO NORTHEAST OKLAHOMA LATER THIS MORNING. IF THIS
OCCURS...ADDITIONAL FLOODING IS LIKELY ESPECIALLY OVER PREVIOUSLY
RAIN-SOAKED AREAS. PERSONS LIVING ALONG CREEKS AND RIVERS...LOW-
LYING FIELDS AND PASTURE LANDS...AND NORMALLY FLOOD PRONE AREAS
SHOULD BE ALERT TO THE POSSIBILITY OF FLOODING LATER TODAY.

THIS IS A POTENTIALLY DANGEROUS FLOOD EVENT...AND NECESSARY PRE/
CAUTIONS SHOULD BE TAKEN NOW TO ENSURE THAT A SWIFT EVACUATION
TO HIGHER GROUND COULD BE DONE IN A SHORT TIME IF NECESSARY LATER
TODAY. FINALLY...REMEMBER THAT MOST FLASH-FLOOD DEATHS OCCUR IN
AUTOMOBILES. UNDER ANY CIRCUMSTANCES...DO NOT DRIVE INTO ANY AREAS
WHERE FLOOD WATERS EXIT. ROADBEDS ARE EASILY WASHED AWAY IN
SITUATIONS LIKE THIS...AND THE DEPTH OF WATERS FLOWING OVER THE
ROADWAY CANNOT BE DETERMINED. IF YOU BECOME STRANDED IN YOUR
CAR IN RISING FLOOD WATERS...ABANDON IT IMMEDIATELY.
Special weather statement, Aug 20, 9:21 AM CDT, 3 hours 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA, OK
916 AM CDT SUN AUG 20 1989

      ...FLASH FLOOD WARNING FOR TULSA COUNTY CANCELLED...

THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR TULSA COUNTY HAS BEEN
CANCELLED. ALL OF THE THUNDERSTORM ACTIVITY HAS MOVED EAST OF THE
TULSA METRO AREA AS OF 9 15 AM WITH ONLY A FEW LIGHT PATCHES OF
RAIN REMAINING OVER THE CITY.

SOME STREAMS AND LOW-LYING AREAS MAY STILL BE EXPERIENCING STANDING
WATER...BUT MOST AREAS HAVE SEEN THE WATER RECEED. CAUTION SHOULD
STILL BE USED IN AREAS WHERE FLOOD WATERS HAVE NOT COMPLETELY
DRAINED.
OCCURS...ADDITIONAL FLOODING IS LIKELY ESPECIALLY OVER PREVIOUSLY
RAIN-SOAKED AREAS. PERSONS LIVING ALONG CREEKS AND RIVERS...LOW-
LYING FIELDS AND PASTURE LANDS...AND NORMALLY FLOOD PRONE AREAS
SHOULD BE ALERT TO THE POSSIBILITY OF FLOODING LATER TODAY.

THIS IS A POTENTIALLY DANGEROUS FLOOD EVENT...AND NECESSARY PRE/
CAUTIONS SHOULD BE TAKEN NOW TO ENSURE THAT A SWIFT EVACUATION
TO HIGHER GROUND COULD BE DONE IN A SHORT TIME IF NECESSARY LATER
TODAY. FINALLY...REMEMBER THAT MOST FLASH-FLOOD DEATHS OCCUR IN
AUTOMOBILES. UNDER ANY CIRCUMSTANCES...DO NOT DRIVE INTO ANY AREAS
WHERE FLOOD WATERS EXIT. ROADBEDS ARE EASILY WASHED AWAY IN
SITUATIONS LIKE THIS...AND THE DEPTH OF WATERS FLOWING OVER THE
ROADWAY CANNOT BE DETERMINED. IF YOU BECOME STRANDED IN YOUR
CAR IN RISING FLOOD WATERS...ABANDON IT IMMEDIATELY.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 8:16 PM CDTSevere Thunderstorm WarningTSACraig, Ottawa59 min
Aug 19, 10:52 PM CDTSevere Thunderstorm WarningTSAOsage, Washington68 min
Aug 19, 11:44 PM CDTFlash Flood WarningTSANowata3 hr
Aug 20, 2:40 AM CDTFlash Flood WarningTSATulsa65 min
Aug 20, 3:06 AM CDTFlash Flood WarningTSATulsa2 hr
Aug 20, 5:18 AM CDTFlash Flood WarningTSATulsa117 min
Aug 20, 7:11 AM CDTFlash Flood WarningTSATulsa2 hr

Nearby

Flash Flood Warnings in Oklahoma, 1989Every flash flood warning in 1989

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.