Alert archive / Oklahoma / Flash Flood Warnings in 1989

Flash Flood Warning 12, NWS Tulsa, OK

August 20, 1989Tulsa County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Aug 20, 1989, 3:06 AM CDT for Tulsa County, Oklahoma. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 20, 1989, 3:06 AM CDT (08:06 UTC)
Expired
Aug 20, 1989, 5:15 AM CDT
In force
2 hr
Issued by
NWS Tulsa, OK
Area
Whole counties

County Tulsa 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 00:00Z, 8.1 hours before the alert went out and 166 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 00:00Z on 1989-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2435 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1989-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.1939Sfc1 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
2435 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
1542 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.7

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

Local storm report, Aug 19, 10:55 PM CDT, 4 hours 11 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
1055 PM CDT SAT AUG 19 1989

   TIME/CDT  COUNTY       EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
       1900   NOWATA      CD REPORTED QUARTER SIZE HAILM JUST SOUTH OF
                          SOUTH COFFEYVILLE.

APPROX 2100   OTTAWA      60+ MPH WINDS DOWNED TREES IN PEORIA. REPORTS
                          OF NUMEROUS TREES DOWN ON ROADS IN PEORIA.
Local storm report, Aug 20, 2:30 AM CDT, 36 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
224 AM CDT SUN AUG 20 1989

   TIME/CDT  COUNTY       EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
   1150PM    NOWATA       REPORT OF 8 INCHES OF RAINFALL IN SOUTH COFFEY/
                          VILLE. MOST ROADS UNDER WATER WITH EVACUATION
                          OF MANY HOMES NECESSARY.

   1255AM    OSAGE/       PUBLIC REPORTED FIVE INCHES OF RAIN NEAR HULAH
      N. WASHINGTON       RESERVOIR. ALSO REPORTS OF LOCALIZED FLOODING
                          NEAR COPAN AS A RESULT OF 4.5 INCHES OF RAIN
                          THERE.

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, 5:18 AM CDTFlash Flood WarningTSATulsa117 min
Aug 20, 7:11 AM CDTFlash Flood WarningTSATulsa2 hr
Aug 20, 12:49 PM CDTFlash Flood WarningTSAOsage, Washington3 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.