Alert archive / Oklahoma / Flash Flood Watches in 2009

Flash Flood Watch 6, NWS Tulsa, OK

May 10, 20094 counties in Oklahoma

NWS Tulsa, OK issued this flash flood watch at May 10, 2009, 4:15 AM CDT for 4 counties in Oklahoma. It was in force for 48 hr.

The area

The counties it named.

The facts

Issued: May 10, 2009, 4:15 AM CDT (09:15 UTC)
Expired: May 12, 2009, 4:02 AM CDT
In force: 48 hr
Issued by: NWS Tulsa, OK
Flood severity: None

Counties Choctaw County, OK, Latimer County, OK, Pittsburg County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 130 km from the middle of the area, began a volume at 09:15 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, 9.3 hours before the alert went out and 190 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1592 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at May 10, 4:05 AM CDT, 10 minutes earlier.

Area forecast discussion, May 10, 4:05 AM CDT, 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
405 AM CDT SUN MAY 10 2009

.DISCUSSION...
CONVECTIVE COMPLEX HAS DEVELOPED IN FAR SOUTHEAST OKLAHOMA
OVERNIGHT. ALTHOUGH THE HEAVIER RAINFALL WILL BE WINDING DOWN OVER
THE NEXT FEW HOURS...FEEL IT IS PRUDENT TO ISSUE A FLASH FLOOD
WATCH EFFECTIVE FROM NOW UNTIL 18Z MONDAY FOR FAR SOUTHEAST
OKLAHOMA AS ADDITIONAL HEAVY RAINFALL WILL BE POSSIBLE LATER
TONIGHT AND MONDAY MORNING.

FOR TODAY...IT LOOKS LIKE FAIRLY WIDESPREAD ALBEIT LIGHT RAINFALL
WILL BE THE RULE ALONG WITH CONSIDERABLE CLOUD COVER. THIS SHOULD
HOLD TEMPERATURES DOWN INTO THE 60S. WITH A FRONTAL BOUNDARY
CONTINUING TO LINGER JUST TO OUR SOUTH...ANOTHER CONVECTIVE
COMPLEX LOOKS IMMINENT LATER TONIGHT INTO MONDAY MORNING WITH
SOUTHEAST OKLAHOMA MOST UNDER THE GUN FOR HEAVY RAINFALL AMOUNTS.

THE FRONTAL BOUNDARY WILL MAKE A BETTER NORTHWARD MOVE BY MONDAY
NIGHT AND TUESDAY WITH ADDITIONAL HEAVY RAINFALL POSSIBLE
SOMEWHERE IN THE FORECAST AREA DURING THIS TIME PERIOD.
TEMPERATURES WILL WARM QUICKLY ONCE THE FRONT MOVES TO THE NORTH
LATE TUESDAY OR TUESDAY EVENING WITH MINIMUMS TUESDAY NIGHT
REMAINING VERY MILD.

A COLD FRONT IS STILL SLATED TO MOVE INTO NORTHEAST OKLAHOMA BY
LATE WEDNESDAY OR WEDNESDAY EVENING LIKELY ACCOMPANIED BY A
SIGNIFICANT ROUND OF CONVECTION. THE LATEST DATA NOW SUGGESTS THAT
THIS FRONT WILL AGAIN HANG UP NEAR THE RED RIVER THURSDAY BEFORE
LIFTING BACK NORTH OF THE AREA BY LATE FRIDAY. THUS THE POTENTIAL
FOR SIGNIFICANT RAINFALL WILL CONTINUE THROUGH FRIDAY.

A BREAK IN THE WEATHER LOOKS TO TAKE PLACE FRIDAY NIGHT AND
SATURDAY BEFORE ANOTHER COLD FRONT MOVES INTO THE AREA LATE
SATURDAY NIGHT AND SUNDAY WITH YET ANOTHER ROUND OF SIGNIFICANT
CONVECTION.

DID NOT STRAY FAR FROM GUIDANCE TEMPERATURES OR POPS THE NEXT
COUPLE DAYS.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   66  53  69  56 /  80  60  60  50
FSM   66  55  66  57 /  80  70  60  40
MLC   66  55  64  59 /  70  70  60  50
BVO   67  50  70  52 /  70  50  50  40
FYV   64  52  66  53 /  80  60  40  30
BYV   64  51  66  53 /  70  60  30  20
MKO   66  54  66  57 /  80  60  60  50
MIO   67  50  69  53 /  70  40  30  20
F10   66  54  64  57 /  80  70  60  50
HHW   69  57  67  60 /  60  70  60  40

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH UNTIL 1 PM MONDAY FOR OKZ049-OKZ053.

AR...NONE.

&&

SHORT TERM...21
LONG TERM....05

PLATE

Hazardous weather outlook, May 9, 10:21 PM CDT, 5 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
1021 PM CDT SAT MAY 9 2009

ARZ001-002-010-011-019-020-029-OKZ049-053>076-101000-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
1021 PM CDT SAT MAY 9 2009

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...TONIGHT.

THUNDERSTORMS WITH DANGEROUS LIGHTNING.
RISK...LIMITED.
AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...AFTER MIDNIGHT.

DISCUSSION...
SHOWERS AND ISOLATED THUNDERSTORMS WILL DEVELOP ACROSS
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS OVERNIGHT AS
WARM AIR ALOFT OVERRUNS THE COOLER AIR AT THE SURFACE.
THE BEST CHANCES FOR THUNDERSTORMS WILL BE ACROSS SOUTHEAST
OKLAHOMA AND WEST-CENTRAL ARKANSAS WHERE THE ELEVATED
INSTABILITIES WILL BE MORE FAVORABLE.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION NOT EXPECTED.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
SUNDAY...THUNDERSTORM POTENTIAL.
MONDAY...THUNDERSTORM POTENTIAL.
TUESDAY...THUNDERSTORM POTENTIAL.
WEDNESDAY...THUNDERSTORM POTENTIAL.
THURSDAY...THUNDERSTORM POTENTIAL.
FRIDAY...NO HAZARDS.

EXTENDED DISCUSSION...
THUNDERSTORM CHANCES WILL CONTINUE DAILY THROUGH MUCH OF
NEXT WEEK.  THESE CHANCES WILL BE DRIVEN BY FRONTAL
BOUNDARIES PASSING THROUGH THE AREA...WITH BOTH HEAVY
RAIN AND SEVERE WEATHER POTENTIAL OCCURRING WITH EACH
ROUND OF THUNDERSTORMS.  MANY LOCATIONS HAVE RECEIVED
EXCESSIVE RAINFALL OVER THE PAST FEW WEEKS...WHICH
WILL SUPPORT BOTH CONTINUED FLASH FLOOD AND RIVER FLOOD
CONCERNS.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
THE ACTIVE WEATHER PATTERN WILL CONTINUE AND RESPONSES TO
BOTH FLASH FLOODING AND SEVERE WEATHER ARE POSSIBLE FOR
MUCH OF THE UPCOMING WEEK.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL TABULAR AND GRAPHICAL
INFORMATION.

In the hours before

Local storm report, May 10, 1:57 AM CDT, 2 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
157 AM CDT SUN MAY 10 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0155 AM     HAIL             ANTLERS                 34.23N 95.62W
05/10/2009  E1.00 INCH       PUSHMATAHA         OK   LAW ENFORCEMENT

&&

GEW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 12:29 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw	31 min
May 10, 1:35 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	55 min
May 10, 4:25 AM CDT	Flash Flood Warning	TSA	Choctaw	4 hr
May 10, 10:00 AM CDT	Flash Flood Warning	TSA	Choctaw	6 hr
May 10, 12:23 PM CDT	Areal Flood Advisory	TSA	Latimer, Pittsburg, Pushmataha	2 hr
May 10, 4:02 PM CDT	Areal Flood Warning	TSA	Choctaw, Pushmataha	4 hr

Nearby

Flash Flood Watches in Oklahoma, 2009 Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.