Alert archive / Oklahoma / Flash Flood Warnings in 2012

Flash Flood Warning 22, NWS Tulsa, OK

April 29, 2012Osage County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Apr 29, 2012, 10:55 PM CDT for Osage County, Oklahoma. It was in force for 4 hr. 2 reports 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: Apr 29, 2012, 10:55 PM CDT (03:55 UTC)
Expired: Apr 30, 2012, 3:00 AM CDT
In force: 4 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

County Osage County, OK

The radar

The Tulsa radar (KINX), 113 km from the middle of the area, began a volume at 03:57 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
Apr 29, 11:00 PM CDT	FLASH FLOOD	Grainola, OK	SEVERAL COUNTY ROADS FLOODED NEAR AND WEST OF GRAINOLA
Apr 30, 12:00 AM CDT	FLASH FLOOD	Bigheart, OK	SEVERAL COUNTY ROAD FLOODED JUST NORTH OF BIGHEART.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 3.9 hours before the alert went out and 92 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: 2178 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

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

688 
WGUS54 KTSA 300355
FFWTSA
OKC113-300800-
/O.NEW.KTSA.FF.W.0022.120430T0355Z-120430T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
1055 PM CDT SUN APR 29 2012

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN OSAGE COUNTY IN NORTHEAST OKLAHOMA...

* UNTIL 300 AM CDT

* AT 1053 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE WARNED AREA. STORMS ARE 
TRAINING OVER THE SAME AREAS OF NORTHERN OSAGE COUNTY. RAINFALL 
MEASUREMENTS IN THE AREA HAVE RECORDED 2 TO 3 INCHES OF RAIN SINCE 
EARLIER THIS EVENING...AND ANOTHER 1 TO 3 INCHES IS POSSIBLE OVER 
FAR NORTHERN OSAGE COUNTY.  

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT COULD EXPERIENCE FLOODING INCLUDE...
  BIGHEART...BURBANK...FORAKER...GRAINOLA...HULAH...PEARSONIA AND
  SHIDLER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD TO
UNKNOWN DEPTHS. IT ONLY TAKES TWO FEET OF RUSHING WATER TO CARRY AWAY
MOST SPORT UTILITY VEHICLES AND PICKUPS. TAKE A DIFFERENT ROUTE TO
REACH YOUR DESTINATION OR WAIT UNTIL THE WATER RECEDES. REMEMBER...
MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN TULSA.

&&

LAT...LON 3700 9600 3678 9600 3668 9684 3675 9684
      3679 9676 3694 9676 3701 9675

$$

1 follow-up statement

154 
WGUS74 KTSA 300458
FFSTSA

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1158 PM CDT SUN APR 29 2012

OKC113-300800-
/O.CON.KTSA.FF.W.0022.000000T0000Z-120430T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OSAGE OK-
1158 PM CDT SUN APR 29 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN OSAGE COUNTY
UNTIL 300 AM CDT...

AT 1157 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE WARNED AREA. MESONET 
RAINFALL OBSERVATIONS IN THE AREA INDICATE THAT BETWEEN 2 AND 4 
INCHES OF RAINFALL HAS ALREADY OCCURRED WITH AN ADDITIONAL 1 TO 2 
INCHES POSSIBLE.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
BIGHEART...BURBANK...FORAKER...GRAINOLA...HULAH...PEARSONIA AND
SHIDLER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD TO
UNKNOWN DEPTHS. IT ONLY TAKES TWO FEET OF RUSHING WATER TO CARRY AWAY
MOST SPORT UTILITY VEHICLES AND PICKUPS. TAKE A DIFFERENT ROUTE TO
REACH YOUR DESTINATION OR WAIT UNTIL THE WATER RECEDES. REMEMBER...
MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN TULSA.

&&

LAT...LON 3700 9600 3678 9600 3668 9684 3675 9684
      3679 9676 3694 9676 3701 9675

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:41 PM CDT	Special Weather Statement	TSA	Osage	34 min
Apr 29, 7:52 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	38 min
Apr 29, 8:16 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	44 min
Apr 29, 8:47 PM CDT	River Flood Warning	TSA	Ottawa	5 days
Apr 29, 8:49 PM CDT	Tornado Warning	TSA	Osage	26 min
Apr 29, 9:13 PM CDT	Tornado Warning	TSA	Osage	29 min
Apr 29, 9:27 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	33 min
Apr 29, 9:48 PM CDT	Areal Flood Advisory	TSA	Nowata, Osage, Pawnee, Washington	3 hr
Apr 29, 9:58 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	47 min
Apr 29, 10:13 PM CDT	Tornado Warning	TSA	Osage, Washington	32 min
Apr 29, 10:35 PM CDT	Severe Thunderstorm Warning	TSA	Nowata	20 min
Apr 29, 11:16 PM CDT	Severe Thunderstorm Warning	TSA	Osage	25 min
Apr 29, 11:44 PM CDT	Special Weather Statement	TSA	Washington	31 min
Apr 30, 12:08 AM CDT	Special Weather Statement	TSA	Craig, Nowata	37 min
Apr 30, 12:18 AM CDT	Special Weather Statement	TSA	Osage	42 min
Apr 30, 12:41 AM CDT	Special Weather Statement	TSA	Ottawa	64 min
Apr 30, 12:47 AM CDT	Special Weather Statement	TSA	Washington	43 min
Apr 30, 1:02 AM CDT	Areal Flood Advisory	TSA	Craig, Nowata, Osage, Ottawa, Pawnee, Rogers and 1 more	3 hr
Apr 30, 2:19 AM CDT	Special Weather Statement	TSA	Osage	41 min
Apr 30, 2:55 AM CDT	Flash Flood Warning	TSA	Osage, Washington	3 hr
Apr 30, 4:06 AM CDT	Areal Flood Advisory	TSA	Craig, Creek, Delaware, Mayes, Nowata, Osage and 6 more	3 hr
Apr 30, 8:26 AM CDT	River Flood Warning	TSA	Nowata	70 hr
Apr 30, 9:15 AM CDT	River Flood Warning	TSA	Washington	23 hr
Apr 30, 9:15 AM CDT	River Flood Warning	TSA	Rogers, Tulsa	41 hr
Apr 30, 11:18 AM CDT	Areal Flood Warning	TSA	Osage, Washington	29 hr
Apr 30, 2:04 PM CDT	Flash Flood Watch	TSA	Craig, Nowata, Ottawa, Pawnee, Washington	17 hr
Apr 30, 2:44 PM CDT	Special Weather Statement	TSA	Choctaw	46 min
Apr 30, 5:33 PM CDT	Special Weather Statement	TSA	LeFlore	27 min

Nearby

Flash Flood Warnings in Oklahoma, 2012 Every flash flood warning in 2012

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.