Alert archive / Oklahoma / Flash Flood Warnings in 2001

Flash Flood Warning 6, NWS Tulsa, OK

May 20, 2001Haskell County, LeFlore County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at May 20, 2001, 10:52 PM CDT for Haskell County, LeFlore County, Sequoyah County, Oklahoma. It was in force for 113 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 20, 2001, 10:52 PM CDT (03:52 UTC)
Expired: May 21, 2001, 12:45 AM CDT
In force: 113 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Haskell County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 47 km from the middle of the area, began a volume at 03:55 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

Springfield, MO (KSGF), launched 00:00Z, 3.9 hours before the alert went out and 193 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1724 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 670 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KTSA 210355
FFWTUL
OKC061-079-135-210545-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
1052 PM CDT SUN MAY 20 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* FLASH FLOOD WARNING FOR
  SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA
  HASKELL COUNTY IN SOUTHEAST OKLAHOMA
  LE FLORE COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 1245 AM CDT

* AT 1052 PM CDT RADAR CONTINUED TO INDICATE THUNDERSTORMS WITH VERY 
HEAVY RAIN MOVING EAST AT 10 MPH...ACROSS MUCH OF SEQUOYAH...HASKELL 
AND LE FLORE COUNTIES. 

RADAR INDICATES THAT 2 TO 3 INCHES OF RAIN HAS ALREADY FALLEN OVER 
THE WARNED AREA. ANOTHER 1 TO 2 INCHES WILL BE POSSIBLE THROUGH   
1245 AM CDT.

* SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN
  INCLUDE POCOLA...SPIRO...BOKOSHE...PANAMA...BRUSHY...VIAN...
  ROLAND...MULDROW...GANS...SALLISAW...TAMAHA...KEOTA AND STIGLER.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGER OF FLASH FLOODS.  IF FLOODING IS OBSERVED ACT QUICKLY AND 
MOVE TO HIGHER GROUND. 

LAT...LON 3555 9508 3516 9523 3514 9445 3557 9450

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:00 PM CDT	Tornado Warning	TSA	Pittsburg	60 min
May 20, 7:06 PM CDT	Severe Thunderstorm Warning	TSA	Nowata	54 min
May 20, 7:12 PM CDT	Tornado Warning	TSA	LeFlore, Sequoyah	63 min
May 20, 7:16 PM CDT	Tornado Warning	TSA	Haskell	44 min
May 20, 7:17 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	28 min
May 20, 7:20 PM CDT	Tornado Warning	TSA	Latimer	55 min
May 20, 7:23 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	67 min
May 20, 7:30 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa, Washington	45 min
May 20, 7:32 PM CDT	Severe Thunderstorm Warning	TSA	Craig	43 min
May 20, 7:39 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	51 min
May 20, 7:43 PM CDT	Tornado Warning	TSA	Pittsburg	62 min
May 20, 7:48 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	42 min
May 20, 8:08 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	67 min
May 20, 8:09 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	51 min
May 20, 8:19 PM CDT	Tornado Warning	TSA	Latimer, LeFlore	56 min
May 20, 8:27 PM CDT	Severe Thunderstorm Warning	TSA	Mayes	63 min
May 20, 8:34 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	26 min
May 20, 8:46 PM CDT	Severe Thunderstorm Warning	TSA	Haskell	44 min
May 20, 9:00 PM CDT	Tornado Warning	TSA	LeFlore	60 min
May 20, 9:19 PM CDT	Severe Thunderstorm Warning	TSA	Latimer	41 min
May 20, 9:50 PM CDT	Severe Thunderstorm Warning	TSA	Haskell	40 min
May 20, 9:59 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	46 min
May 20, 10:04 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	56 min
May 20, 10:13 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pushmataha	62 min
May 20, 10:25 PM CDT	Severe Thunderstorm Warning	TSA	Latimer	50 min
May 20, 10:39 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	51 min
May 20, 10:46 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	59 min
May 20, 11:06 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	54 min
May 20, 11:07 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	38 min
May 20, 11:31 PM CDT	Severe Thunderstorm Warning	TSA	Haskell	44 min
May 20, 11:45 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	45 min
May 20, 11:50 PM CDT	Severe Thunderstorm Warning	TSA	Latimer	55 min
May 20, 11:56 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	49 min
May 21, 12:03 AM CDT	Tornado Warning	TSA	LeFlore	27 min
May 21, 12:45 AM CDT	Severe Thunderstorm Warning	TSA	Pittsburg, Pushmataha	45 min
May 21, 1:28 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	62 min
May 21, 2:26 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	64 min
May 21, 2:29 AM CDT	Flash Flood Warning	TSA	Pushmataha	3 hr

Nearby

Flash Flood Warnings in Oklahoma, 2001 Every flash flood warning in 2001

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.