Alert archive / Oklahoma / Flash Flood Watches in 2009

Flash Flood Watch 10, NWS Tulsa, OK

August 17, 2009Nowata County, Pawnee County, Washington County, Oklahoma

NWS Tulsa, OK issued this flash flood watch at Aug 17, 2009, 3:06 PM CDT for Nowata County, Pawnee County, Washington County, Oklahoma. It took effect at Aug 17, 2009, 4:00 PM CDT. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued
Aug 17, 2009, 3:06 PM CDT (20:06 UTC)
In effect from
Aug 17, 2009, 4:00 PM CDT
Expired
Aug 18, 2009, 1:00 PM CDT
In force
21 hr
Issued by
NWS Tulsa, OK
Flood severity
None

Counties Nowata County, OK, Pawnee County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 66 km from the middle of the area, began a volume at 20:08 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

Lamont, OK (KLMN), launched 12:00Z, 8.1 hours before the alert went out and 126 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, Lamont, OK at 12:00Z on 2009-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1355 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, Lamont, OK at 12:00Z on 2009-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 188 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
1355 J/kg
Mixed-layer CIN
-180 J/kg
Mixed-layer LCL
1077 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
188 m²/s²
0-3 km storm-relative helicity
311 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.8

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 Aug 17, 12:47 PM CDT, 2 hours 19 minutes earlier.

Area forecast discussion, Aug 17, 12:47 PM CDT, 2 hours 19 minutes before
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Hazardous weather outlook, Aug 17, 1:01 PM CDT, 2 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
101 PM CDT MON AUG 17 2009

ARZ001-002-010-011-019-020-029-OKZ049-053>076-181000-
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-
1243 PM CDT MON AUG 17 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERE THUNDERSTORM.
RISK...ELEVATED.
AREA...NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING.

FLASH FLOOD.
RISK...ELEVATED.
AREA...NORTHEAST OKLAHOMA.
ONSET...ONGOING.

HEAVY RAIN.
RISK...ELEVATED.
AREA...NORTHEAST OKLAHOMA.
ONSET...ONGOING.

DANGEROUS HEAT.
RISK...LIMITED.
AREA...EAST CENTRAL OKLAHOMA AND WEST CENTRAL ARKANSAS.
ONSET...ONGOING.

SIGNIFICANT WINDS.
RISK...LIMITED.
AREA...NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING.

DISCUSSION...
A STRONG OUTFLOW BOUNDARY MOVING SOUTHEAST ACROSS NORTHEAST
OKLAHOMA AND NORTHWEST ARKANSAS CAUSE WINDS TO GUST BRIEFLY
TO AROUND 40 MPH AND TRIGGERED SCATTERED SHOWERS AND
THUNDERSTORMS ACROSS THE AREA. WINDS HAVE BEEN SLOWLY
DIMINISHING WITH THIS BOUNDARY. SOME THUNDERSTORMS COULD BE
MARGINALLY SEVERE WITH HIGH WINDS BEING THE STRONGEST THREAT.

SOME AREAS OF NORTHEAST OKLAHOMA RECEIVED AROUND 3 INCHES OF RAIN
LAST NIGHT AND TODAY AND AN ADDITIONAL ONE OR 2 INCHES COULD CAUSE
FLASH FLOODING TONIGHT.

HEAT INDEX VALUES AHEAD OF THE OUTFLOW BOUNDARY WILL PEAK AT 100
TO 105 DEGREES THIS AFTERNOON.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
ACTIVATION OF THE REGIONAL SPOTTER NETWORK LIKELY.

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

EXTENDED DISCUSSION...
A FRONTAL BOUNDARY STRETCHED SOUTHWEST TO NORTHEAST ACROSS
KANSAS WILL DRIFT SOUTH THE NEXT COUPLE DAYS. THURSDAY THAT
BOUNDARY WILL ACCELERATE SOUTH IN RESPONSE TO A SIGNIFICANT
UPPER TROUGH DROPPING SOUTHEAST THROUGH THE PLAINS. THUNDER
CHANCES IN NORTHEAST OKLAHOMA... WEST CENTRAL AND NORTHWEST
ARKANSAS...WILL PEAK THURSDAY IN RESPONSE TO THE TROUGH AND
FRONT.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

In the hours before

Special weather statement, Aug 17, 11:07 AM CDT, 3 hours 59 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1107 AM CDT MON AUG 17 2009

OKZ054>064-067-171700-
CRAIG OK-CREEK OK-DELAWARE OK-MAYES OK-NOWATA OK-OSAGE OK-OTTAWA
OK-PAWNEE OK-ROGERS OK-TULSA OK-WAGONER OK-WASHINGTON OK-
1107 AM CDT MON AUG 17 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL NOON CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHEAST OKLAHOMA
     NORTHWESTERN WAGONER...ROGERS...NORTHERN DELAWARE...CRAIG...
     OTTAWA...SOUTHERN NOWATA...WASHINGTON...SOUTHEASTERN OSAGE...
     NORTHERN CREEK...TULSA...MAYES AND PAWNEE

AT 1104 AM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM PYRAMID CORNERS TO 11 MILES SOUTHWEST OF
MARAMEC...MOVING SOUTHEAST AT 35 MPH. COUNTIES THAT WILL BE AFFECTED
BY THESE STORMS INCLUDE NORTHWESTERN WAGONER...ROGERS...NORTHERN
DELAWARE...CRAIG...OTTAWA...SOUTHERN
NOWATA...WASHINGTON...SOUTHEASTERN OSAGE...NORTHERN
CREEK...TULSA...MAYES AND PAWNEE COUNTIES THROUGH NOON CDT.

THESE STORMS ARE ALONG AN OUTFLOW BOUNDARY THAT IS RAPIDLY MOVING
SOUTHEAST ACROSS NORTHEAST OKLAHOMA. WHILE THE STORMS ARE SHOWING
A SLOW WEAKENING TREND THEY STILL WILL BE CAPABLE OF PRODUCING WIND
GUSTS OF 40 TO 50 MPH AS THEY PASS THROUGH THESE AREAS.

LAT...LON 3697 9461 3649 9463 3587 9608 3586 9620
      3598 9663 3616 9663 3617 9682 3697 9498
TIME...MOT...LOC 1604Z 270DEG 14KT 3682 9512 3613 9681
Special weather statement, Aug 17, 11:53 AM CDT, 3 hours 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1153 AM CDT MON AUG 17 2009

OKZ054-057-060>068-070-171745-
CHEROKEE OK-CRAIG OK-CREEK OK-DELAWARE OK-MAYES OK-MUSKOGEE
OK-OKFUSKEE OK-OKMULGEE OK-OSAGE OK-ROGERS OK-TULSA OK-WAGONER OK-
1153 AM CDT MON AUG 17 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1245 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHEAST OKLAHOMA
     NORTHERN OKMULGEE...NORTHWESTERN WAGONER...SOUTHERN ROGERS...
     DELAWARE...SOUTHEASTERN CRAIG...SOUTHEASTERN OSAGE...CREEK...
     TULSA AND MAYES

IN EAST CENTRAL OKLAHOMA
     NORTHWESTERN MUSKOGEE...NORTHWESTERN CHEROKEE AND NORTHWESTERN
     OKFUSKEE

AT 1152 AM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 2 MILES NORTHWEST OF CLEORA TO 3 MILES SOUTHWEST
OF SHAMROCK...MOVING SOUTHEAST AT 20 MPH.

THESE STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS IN THE 40 TO 50
MPH.

LAT...LON 3666 9462 3631 9458 3544 9660 3596 9663
      3668 9500
TIME...MOT...LOC 1652Z 330DEG 18KT 3660 9499 3586 9661
Local storm report, Aug 17, 12:20 PM CDT, 2 hours 46 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1220 PM CDT MON AUG 17 2009

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

1217 PM     HAIL             2 E PEORIA              36.92N 94.63W
08/17/2009  E0.75 INCH       OTTAWA             OK   PUBLIC

&&

JDS
Special weather statement, Aug 17, 12:28 PM CDT, 2 hours 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1228 PM CDT MON AUG 17 2009

ARZ001-010-OKZ060-062>071-171815-
ADAIR OK-BENTON AR-CHEROKEE OK-CREEK OK-DELAWARE OK-MAYES OK-MCINTOSH
OK-MUSKOGEE OK-OKFUSKEE OK-OKMULGEE OK-TULSA OK-WAGONER OK-WASHINGTON
AR-
1228 PM CDT MON AUG 17 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 115 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHWEST ARKANSAS
     NORTHWESTERN WASHINGTON AND SOUTHWESTERN BENTON

IN NORTHEAST OKLAHOMA
     OKMULGEE...WAGONER...DELAWARE...NORTHERN ADAIR...SOUTHERN
     CREEK...SOUTHERN TULSA AND SOUTHERN MAYES

IN EAST CENTRAL OKLAHOMA
     MUSKOGEE...CHEROKEE AND OKFUSKEE

IN SOUTHEAST OKLAHOMA
     NORTHERN MCINTOSH

AT 1228 PM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 10 MILES NORTH OF MAYSVILLE TO 5 MILES NORTHWEST
OF WAGONER TO 6 MILES SOUTHWEST OF SLICK...MOVING SOUTHEAST AT 30
MPH.

THE WIND GUSTS BEHIND THE OUTFLOW BOUNDARY HAVE BEEN DECREASING OVER
TIME...BUT THESE STORMS REMAIN CAPABLE OF PRODUCING WIND GUSTS TO 40
MPH.

LAT...LON 3661 9461 3650 9461 3650 9443 3625 9404
      3566 9491 3565 9512 3561 9513 3530 9642
      3574 9655 3608 9544 3664 9465
TIME...MOT...LOC 1728Z 298DEG 24KT 3653 9463 3601 9540
          3573 9634
Special weather statement, Aug 17, 12:56 PM CDT, 2 hours 10 minutes before
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Special weather statement, Aug 17, 1:25 PM CDT, 1 hour 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
125 PM CDT MON AUG 17 2009

ARZ001-002-010-011-019-OKZ063-068>070-171930-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CRAWFORD AR-DELAWARE
OK-MADISON AR-MUSKOGEE OK-WASHINGTON AR-
125 PM CDT MON AUG 17 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 230 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHWEST ARKANSAS
     WASHINGTON...WESTERN CARROLL...NORTHERN CRAWFORD...BENTON AND
     NORTHWESTERN MADISON

IN EAST CENTRAL OKLAHOMA
     NORTHEASTERN MUSKOGEE AND SOUTHERN CHEROKEE

IN NORTHEAST OKLAHOMA
     SOUTHEASTERN DELAWARE AND ADAIR

AT 125 PM CDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 7 MILES NORTH OF BELLA VISTA TO 3 MILES NORTHWEST
OF WATTS TO 6 MILES EAST OF FORT GIBSON...MOVING EAST AT 20 MPH.

THESE STORMS WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS
TO 50 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE THE
SIGNIFICANT WEATHER ALERT IS UPGRADED TO A WARNING.

LAT...LON 3603 9376 3558 9419 3562 9447 3565 9448
      3565 9465 3574 9534 3614 9472 3650 9440
      3650 9340
TIME...MOT...LOC 1825Z 273DEG 19KT 3653 9427 3613 9461
          3580 9514

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 11:36 PM CDTSpecial Weather StatementTSAOsage54 min
Aug 17, 1:43 AM CDTFlash Flood WarningTSAOsage, Pawnee4 hr
Aug 17, 10:25 AM CDTSpecial Weather StatementTSANowata, Osage, Pawnee, Washington50 min
Aug 17, 11:07 AM CDTSpecial Weather StatementTSACraig, Mayes, Ottawa, Rogers, Tulsa53 min
Aug 17, 11:53 AM CDTSpecial Weather StatementTSACreek, Delaware, Mayes, Rogers, Tulsa, Wagoner52 min
Aug 17, 11:55 AM CDTSevere Thunderstorm WarningTSAOttawa35 min
Aug 17, 12:28 PM CDTSpecial Weather StatementTSAAdair, Cherokee, Delaware, Muskogee, Okfuskee, Okmulgee and 1 more47 min
Aug 17, 12:56 PM CDTSpecial Weather StatementTSAOsage49 min
Aug 17, 1:25 PM CDTSpecial Weather StatementTSAAdair, Cherokee65 min
Aug 17, 4:30 PM CDTAreal Flood AdvisoryTSALeFlore, Sequoyah60 min
Aug 17, 3:15 PM CDTFlash Flood WarningTSAMadison2 hr

Nearby

Flash Flood Watches in Oklahoma, 2009Every 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.