Alert archive / Oklahoma / Flash Flood Warnings in 1991

Flash Flood Warning 1, NWS Tulsa, OK

April 13, 1991LeFlore County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Apr 13, 1991, 1:39 AM CDT for LeFlore County, Oklahoma. It was in force for 66 min.

The area

The counties it named.

The facts

Issued
Apr 13, 1991, 1:39 AM CDT (06:39 UTC)
Expired
Apr 13, 1991, 2:45 AM CDT
In force
66 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County LeFlore County, OK

The nearest sounding before it

Springfield, MO (KUMN), launched 00:00Z, 6.7 hours before the alert went out and 237 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, Springfield, MO at 00:00Z on 1991-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 972 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, Springfield, MO at 00:00Z on 1991-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 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
972 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
837 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSM 130647
FFWFSM
OKC079-130745-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT SMITH AR
139 AM CDT SAT APR 13 1991
 
THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  245 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST OKLAHOMA
 
   ...SOUTHERN LE FLORE COUNTY
 
AT 140 AM WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM ON THE
SOUTH COUNTY LINE ABOUT 15 MILE SOUTHEAST OF MUSE. THIS STORM
WILL PASS NEAR OCTAVIA. LARGE HAIL IS POSSIBLE WITH THIS STORM.
FLASH FLOODING WILL ALSO OCCUR IN SOUTHERN LEFLORE COUNTY.  THE
THUNDERSTORM IS MOVING NORTHEAST AT 15 MPH.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 13, 7:05 AM CDTSevere Thunderstorm WarningTSAOsage40 min

Nearby

Flash Flood Warnings in Oklahoma, 1991Every flash flood warning in 1991

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.