Alert archive / Oklahoma / Flash Flood Warnings in 1997

Flash Flood Warning 4, NWS Tulsa, OK

April 11, 1997Osage County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Apr 11, 1997, 1:58 AM CDT for Osage County, Oklahoma. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 11, 1997, 1:58 AM CDT (06:58 UTC)
Expired
Apr 11, 1997, 5:00 AM CDT
In force
3 hr
Issued by
NWS Tulsa, OK
Area
Whole counties

County Osage County, OK

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 07:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.0 hours before the alert went out and 181 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 1997-04-11Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 1997-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 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
1196 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 110704 COR
FFWTUL
OKC113-111000-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED...
NATIONAL WEATHER SERVICE TULSA OK
158 AM CDT FRI APR 11 1997
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  500 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST OKLAHOMA
 
   ...WESTERN OSAGE COUNTY
 
RAINS IN EXCESS OF 2 INCHES HAVE FALLEN OVER WESTERN PORTIONS OF OSAGE
COUNTY THROUGH THE EVENING. MODERATE TO HEAVY RAIN WILL CONTINUE
THROUGH 3 AM WITH AN ADDITIONAL INCH OR 2 OF RAIN POSSIBLE. FLOODING OF
LOW LYING AREAS AND POOR DRAINAGE AREAS CAN BE EXPECTED. THE COMMUNITIES
OF GRAINOLA...SHIDLER...AND BURBANK IN NORTHWESTERN OSAGE COUNTY CAN
EXPECT FLOODING OF STREETS AND ALSO PONDING OF WATER ALONG COUNTY ROADS.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS LIKELY OR HAS BEEN
REPORTED.  STAY ALERT AND WATCH FOR RAPIDLY RISING WATER.
REMEMBER...IT'S IMPORTANT TO KNOW WHERE YOU AREP RELATIVE TO THE
NEAREST STREAM...CREEK OR RIVER WHICH CAN BECOME A KILLER DURING
PERIODS OF HEAVY RAIN.
 
KEEP TUNED TO THIS STATION FOR THE LATEST WEATHER BULLETINS.

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.

NWS Tulsa, OK wrote its last area forecast discussion before this flash flood warning went out at Apr 10, 10:06 PM CDT, 3 hours 52 minutes earlier.

Area forecast discussion, Apr 10, 10:06 PM CDT, 3 hours 52 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
940 PM CDT THU APR 10 1997

CDFNT HAS MANAGED TO SAG DOWN INTO FAR NWRN PART OF FA THIS EVNG
WITH SHRA/TSRA GENRLLY CONFINED NORTH OF I-44 ATTM.  FNT NOT XPCTD
TO MAKE MUCH MORE SWRD PROGRESS THRU THE NGT AND XPCTD TO STAY TO
THE NORTH OF TUL.  MAIN CHGS WITH THIS EVNGS UPDATED WILL BE TO
AREAS TO THE NORTH AND WEST OF TUL WITH ONLY A FEW MINOR CHGS
ELSEWHERE.  ...04...

OK...NONE.
AR...NONE.

In the hours before

Special weather statement, Apr 10, 8:30 PM CDT, 5 hours 28 minutes before
OKZ054-059-064-065-110200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK...UPDATE..
NATIONAL WEATHER SERVICE TULSA OK
830 PM CDT THU APR 10 1997

SEVERE THUNDERSTORM WATCH NUMBER 151 HAS BEEN ISSUED FOR PARTS OF
WESTERN AND CENTRAL OKLAHOMA.  THE EASTERN PORTION OF THE WATCH
INCLUDES OSAGE...PAWNEE...CREEK...AND OKFUSKEE COUNTIES UNTIL 200
AM CDT FRIDAY.

STRONG SOUTHERLY WINDS CONTINUE TO BRING MOIST UNSTABLE AIR INTO
OKLAHOMA.  THE MOISTURE IS CONVERGING ALONG A COLD FRONT WHICH WILL
MOVE SLOWLY SOUTHEAST ACROSS THE STATE DURING THE NIGHT.
SEVERE THUNDERSTORMS WHICH DO DEVELOP ARE EXPECTED TO PRODUCE
MAINLY HAIL AND STRONG WINDS.  HOWEVER...ISOLATED TORNADOES MAY
STILL BECOME A THREAT LATER IN THE NIGHT.

THE THREAT OF SEVERE WEATHER EXISTS OVER OSAGE AND PAWNEE COUNTIES
AT THIS TIME.  HOWEVER...THE THREAT OF SEVERE WEATHER IS NOT
EXPECTED OVER CREEK AND OKFUSKEE COUNTIES UNTIL AFTER 10 PM.

EMERGENCY MANAGEMENT AGENCIES IN THE OSAGE AND PAWNEE COUNTIES
SHOULD ACTIVATE AT THIS TIME.  AGENCIES IN THE CREEK AND OKFUSKEE
COUNTIES SHOULD MONITOR THE LATEST WEATHER CONDITIONS AND BE
PREPARED TO ACTIVATE LATER IN THE EVENING.
Special weather statement, Apr 10, 10:35 PM CDT, 3 hours 23 minutes before
OKZ054-059-064-065-111200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE TULSA OK
1035 PM CDT THU APR 10 1997

ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE FOR THE REMAINDER OF
THE NIGHT...GENERALLY NORTHWEST OF A LINE FROM MIAMI TO MUSKOGEE TO
MCALESTER.

STRONG SOUTHERLY WINDS CONTINUE TO BRING MOIST UNSTABLE AIR INTO
OKLAHOMA.  THE MOISTURE IS CONVERGING ALONG A FRONT WHICH WILL MOVE
VERY SLOWLY SOUTHEAST DURING THE NIGHT.  BY MORNING...THE FRONT
WILL EXTEND FROM NEAR MIAMI TO NEAR TULSA AND ON INTO SOUTHWEST
OKLAHOMA.  THUNDERSTORMS MAY DEVELOP ANYWHERE ALONG THE FRONT...
WITH THE MAIN SEVERE WEATHER THREAT BEING FROM HAIL AND STRONG
WINDS.

EMERGENCY MANAGEMENT AGENCIES SHOULD MONITOR THE LATEST WEATHER
INFORMATION...AND BE PREPARED TO ACTIVATE AS CONDITIONS WARRANT.
Special weather statement, Apr 10, 10:36 PM CDT, 3 hours 22 minutes before
OKZ054-059-064-065-111200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE TULSA OK
1035 PM CDT THU APR 10 1997

ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE FOR THE REMAINDER OF
THE NIGHT...GENERALLY NORTHWEST OF A LINE FROM MIAMI TO MUSKOGEE TO
MCALESTER.

STRONG SOUTHERLY WINDS CONTINUE TO BRING MOIST UNSTABLE AIR INTO
OKLAHOMA.  THE MOISTURE IS CONVERGING ALONG A FRONT WHICH WILL MOVE
VERY SLOWLY SOUTHEAST DURING THE NIGHT.  BY MORNING...THE FRONT
WILL EXTEND FROM NEAR MIAMI TO NEAR TULSA AND ON INTO SOUTHWEST
OKLAHOMA.  THUNDERSTORMS MAY DEVELOP ANYWHERE ALONG THE FRONT...
WITH THE MAIN SEVERE WEATHER THREAT BEING FROM HAIL AND STRONG
WdINDS.

EMERGENCY MANAGEMENT AGENCIES SHOULD MONITOR THE LATEST WEATHER
INFORMATION...AND BE PREPARED TO ACTIVATE AS CONDITIONS WARRANT.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 11, 4:48 AM CDTFlash Flood WarningTSAOsage4 hr
Apr 11, 5:22 AM CDTSevere Thunderstorm WarningTSAMcIntosh53 min

Nearby

Flash Flood Warnings in Oklahoma, 1997Every flash flood warning in 1997

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; radar from the NEXRAD Level II archive.