Alert archive / Oklahoma / Flash Flood Warnings in 2009
Flash Flood Warning 13, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at May 11, 2009, 7:47 AM CDT for Bryan County, Oklahoma. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 11, 2009, 7:47 AM CDT (12:47 UTC)
- Expired
- May 11, 2009, 10:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Flood severity
- None
County Bryan County, OK
The radar
The Dallas/Ft Worth radar (KFWS), 182 km from the middle of the area, began a volume at 12:46 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 7:50 AM CDT | FLASH FLOOD | Durant, OK | SEVERAL STREETS IN TOWN CLOSED DUE TO FLOODING |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 3 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 0.8 hours before the alert went out and 159 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.
- Mixed-layer CAPE
- 65 J/kg
- Mixed-layer CIN
- -232 J/kg
- Mixed-layer LCL
- 452 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS54 KOUN 111247
FFWOUN
OKC013-111545-
/O.NEW.KOUN.FF.W.0013.090511T1247Z-090511T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
747 AM CDT MON MAY 11 2009
THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BRYAN COUNTY IN SOUTHEAST OKLAHOMA...
* UNTIL 1045 AM CDT
* AT 743 AM CDT...HEAVY RAINS IN AN EXCESS OF ONE INCH PER HOUR HAS
BEEN OCCURRING OVER PORTIONS OF BRYAN COUNTY THIS MORNING. SOME
ROADS IN DURANT WERE REPORTED BEING CLOSED DUE TO HIGH WATER. THE
RAINFALL OVER THE PAST SEVERAL DAYS HAS LEFT THE GROUND SATURATED
AND ANY ADDITIONAL RAINFALL WILL CONTINUE TO QUICKLY RUNOFF...
COLLECTING IN STREAMS AND OTHER LOW-LYING AREAS.
* LOCATIONS IN THE WARNING INCLUDE ACHILLE...ALBANY...ARMSTRONG...
BENNINGTON...BLUE...BOKCHITO...CADDO...CALERA...CARTWRIGHT...
COLBERT...DURANT...EASTERN LAKE TEXOMA...KEMP...MEAD...SILO...UTICA
AND WADE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARM LANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
AS LITTLE AS 6 INCHES OF WATER MAY CAUSE YOU TO LOSE CONTROL OF YOUR
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES
INCLUDING SPORT UTILITY VEHICLES AND PICKUP TRUCKS. MOVE TO HIGHER
GROUND.
&&
LAT...LON 3389 9594 3385 9596 3387 9599 3384 9601
3384 9609 3379 9616 3373 9636 3378 9642
3378 9645 3384 9659 3409 9654 3415 9643
3415 9595 3395 9593 3393 9589 3388 9588
$$
CJSWhat 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 Norman, OK wrote its last area forecast discussion before this flash flood warning went out at May 11, 6:35 AM CDT, 1 hour 12 minutes earlier.
Area forecast discussion, May 11, 6:35 AM CDT, 1 hour 12 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
635 AM CDT MON MAY 11 2009
.AVIATION...
12Z TAFS - CURRENT RAIN/T-STORM COMPLEX WILL SHIFT SLOWLY E/SE
THIS MORNING. SCATTERED SHRA/TSRA MAY PERSIST THROUGH THE PERIOD
BUT ANOTHER ROUND OF MORE WIDESPREAD ACTIVITY APPEARS MORE LIKELY
FROM MID/LATE EVENING THROUGH 12Z. IFR CIGS EXPECTED TO PREVAIL
BUT THERE WILL BE CONSIDERABLE FLUCTUATION IN VICINITY OF
PRECIP/TSRA. WE HAVE LOST CONTACT WITH KPNC ASOS AND THUS HAVE
SUSPENDED AMENDMENTS THERE UFN.
&&
.PREV DISCUSSION... /ISSUED 254 AM CDT MON MAY 11 2009/
DISCUSSION...
NSSL/OUN WRF MODELS HAVE PERFORMED REASONABLY WELL THIS MORNING WITH
GENERAL EVOLUTION OF THE CONVECTION NOW SPREADING FROM TX PANHANDLE
INTO W OK. BOTH INDICATE SHOWERS/STORMS FILLING IN AND
INTENSIFYING ACROSS MUCH OF THE S HALF OF THE CWA OVER NEXT 2-3
HRS - A PROCESS THAT RADAR INDICATES IS ALREADY UNDERWAY. NSSL
WRF RUN-TOTAL PRECIP INDICATES WIDESPREAD 1-2 INCH TOTALS BY
MIDDAY ACROSS THESE AREAS WITH LOCALLY HIGHER AMOUNTS. POPS HAVE
BEEN JACKED UP TO CATEGORICAL FOR MOST AREAS FROM CENTRAL OK
SOUTHWARD. FLASH FLOOD WATCH WILL BE MAINTAINED AS IS... VALID
THROUGH NOON. MODELS INDICATE HEAVIEST RAINFALL IN WATCH AREA WILL
BE THIS MORNING SO WILL DEFER ON WHETHER OR NOT TO EXTEND IN TIME.
CONVECTIVE DEVELOPMENT AGAIN PRECLUDES SPENDING MUCH TIME ON
LATTER PERIODS OF THE FORECAST. STARTED WITH GFS MOS FOR MOST OF
THE TEMPS/POPS AND IN MOST CASES MADE ADJUSTMENTS TO BLEND BETTER
WITH NEIGHBORING GRIDS. WARMER WITH DECREASED POPS TUE INTO WED.
DRYLINE CONVECTION LATE TUE APT TO REMAIN MOSTLY W OF AREA BUT
COUND EASILY BE SEVERE. NEXT BIG CHANCE OF RAIN WED INTO WED NIGHT
WITH COLD FRONT. FRONT MAY LINGER IN OR NEAR AREA INTO THU NIGHT
BEFORE LIFTING N AND/OR WASHING OUT ON FRIDAY. NEXT COLD FRONT TO
ARRIVE EARLY IN WEEKEND WITH YET MORE CHANCES OF RAIN/T-STORMS.
AIR MASS BEHIND THIS FRONT WILL BE AT LEAST PARTIALLY OF CANADIAN
ORIGIN. GIVEN THAT AND THE PROGGED SIGNIFICANT AMPLIFICATION OF AN
EASTERN CONUS TROUGH... AND NNW FLOW ALOFT OVER PLAINS... HAVE
BROUGHT TEMPS DOWN QUITE A BIT NEXT WEEKEND PER TRENDS IN MEX MOS
GUIDANCE. THE AMPLIFIED WESTERN RIDGE/EASTERN TROUGH PATTERN
ADVERTIZED NEXT WEEKEND MAY ACTUALLY LEAD TO DRY WEATHER AROUND
HERE BY NEXT SUNDAY.
&&
.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK 62 57 80 68 / 80 60 40 10
HOBART OK 59 56 84 68 / 80 50 20 20
WICHITA FALLS TX 68 59 86 70 / 80 50 20 10
GAGE OK 63 50 82 64 / 50 30 20 20
PONCA CITY OK 64 53 73 67 / 50 50 50 20
DURANT OK 66 60 81 70 / 90 50 30 10
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH UNTIL NOON CDT TODAY FOR OKZ040>043-046>048-
050>052.
TX...NONE.
&&
23/24/24Hazardous weather outlook, May 11, 5:00 AM CDT, 2 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
500 AM CDT MON MAY 11 2009
OKZ004>048-050>052-TXZ083>090-111700-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
500 AM CDT MON MAY 11 2009
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...TODAY AND TONIGHT...
THUNDERSTORM OUTLOOK...
NUMEROUS THUNDERSTORMS ARE EXPECTED... A FEW OF WHICH MAY BE SEVERE.
DISCUSSION...
NUMEROUS THUNDERSTORMS WILL OCCUR OVER OKLAHOMA AND NORTH TEXAS THIS
MORNING... AS MOIST AIR CONTINUES TO BE FORCED OVER A COOL AIRMASS
AT THE SURFACE. ALTHOUGH INSTABILITIES AND WIND FIELDS ARE NOT
PARTICULARLY STRONG... HAIL WILL BE POSSIBLE WITH THE STRONGEST
STORMS. CONDITIONS ARE EXPECTED TO BE SOMEWHAT MORE FAVORABLE FOR
STRONG THUNDERSTORMS TONIGHT... AND AGAIN... MARGINALLY SEVERE HAIL
WILL BE THE MAIN CONCERN.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY MAY 12.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.
OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL HAS LEFT THE GROUND SATURATED ACROSS PARTS OF THE
AREA. ANY ADDITIONAL HEAVY RAINFALL WILL RESULT IN RAPID RUNOFF AND
POSSIBLE FLASH FLOODING. A FLASH FLOOD WATCH IS IN EFFECT. PLEASE
REFER TO THE LATEST VERSION OF THIS PRODUCT FOR MORE INFORMATION.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...
THUNDERSTORM OUTLOOK...
THUNDERSTORMS ARE EXPECTED EACH DAY FROM TUESDAY THROUGH SATURDAY.
THERE IS A SLIGHT RISK OF SEVERE STORMS OVER WESTERN OKLAHOMA ON
TUESDAY... AND OVER MOST OF OKLAHOMA AND NORTH TEXAS ON WEDNESDAY.
OTHER HAZARDOUS WEATHER...
NONE.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT NOON
TODAY.
CMSIn the hours before
Special weather statement, May 11, 3:57 AM CDT, 3 hours 50 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 357 AM CDT MON MAY 11 2009 OKZ014-021-110915- ROGER MILLS OK-BECKHAM OK- 357 AM CDT MON MAY 11 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM AND ROGER MILLS COUNTIES. A STRONG THUNDERSTORM WAS LOCATED 14 MILES WEST OF SWEETWATER AT 356 AM CDT. ANOTHER STRONG THUNDERSTORM WAS 6 MILES SOUTHWEST OF CARTER. MOVEMENT WAS EAST AT 25 MPH. SMALL HAIL AND HEAVY DOWNPOURS ARE LIKELY. 24
Special weather statement, May 11, 7:08 AM CDT, 39 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 708 AM CDT MON MAY 11 2009 OKZ039-045-046-111230- JEFFERSON OK-CARTER OK-STEPHENS OK- 708 AM CDT MON MAY 11 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR WESTERN CARTER... NORTHERN JEFFERSON AND SOUTHERN STEPHENS COUNTIES. A STRONG THUNDERSTORM WAS LOCATED 9 MILES WEST OF LOCO AT 706 AM CDT...MOVING EAST AT 35 MPH. SMALL HAIL... HEAVY RAIN AND BRIEF WIND GUSTS TO NEAR 40 MPH AREA LIKELY WITH THIS STORM. CJS
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 4:48 AM CDT | Areal Flood Advisory | OUN | Beckham, Greer, Kiowa, Washita | 3 hr |
| May 11, 7:35 AM CDT | Areal Flood Advisory | OUN | Bryan | 3 hr |
| May 11, 7:56 AM CDT | Areal Flood Advisory | OUN | Johnston | 3 hr |
| May 11, 8:04 AM CDT | Areal Flood Advisory | OUN | Carter, Jefferson, Love | 3 hr |
| May 11, 10:48 AM CDT | Areal Flood Advisory | OUN | Bryan | 3 hr |
| May 11, 10:52 AM CDT | River Flood Warning | OUN | Bryan | 47 hr |
| May 11, 2:45 PM CDT | River Flood Warning | OUN | Atoka, Bryan | 53 hr |
Nearby
Flash Flood Warnings in Oklahoma, 2009Every flash flood warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.