Alert archive / Arkansas / Flash Flood Warnings in 2011

Flash Flood Warning 31, NWS Tulsa, OK

May 20, 2011Madison County, Washington County, Arkansas

NWS Tulsa, OK issued this flash flood warning at May 20, 2011, 11:39 AM CDT for Madison County, Washington County, Arkansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 20, 2011, 11:39 AM CDT (16:39 UTC)
Expired: May 20, 2011, 2:30 PM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Madison County, AR, Washington County, AR

The radar

The Western Arkansas radar (KSRX), 106 km from the middle of the area, began a volume at 16:41 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 12:00Z, 4.7 hours before the alert went out and 85 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: 537 J/kg
Mixed-layer CIN: -280 J/kg
Mixed-layer LCL: 940 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

505 
WGUS54 KTSA 201639
FFWTSA
ARC087-143-201930-
/O.NEW.KTSA.FF.W.0031.110520T1639Z-110520T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
1139 AM CDT FRI MAY 20 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN WASHINGTON COUNTY IN NORTHWEST ARKANSAS...
  MADISON COUNTY IN NORTHWEST ARKANSAS...

* UNTIL 230 PM CDT

* AT 1138 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN THAT WILL MOVE INTO THE 
WARNED AREA BY NOON. 2 TO 3 INCHES OF RAINFALL HAS ALREADY OCCURRED 
WITH THUNDERSTORMS EARLIER THIS MORNING...AND AN ADDITIONAL 1 TO 3 
INCHES WILL BE POSSIBLE WITH THIS LINE OF STORMS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT COULD EXPERIENCE FLOODING INCLUDE...
  HUNTSVILLE...AURORA...BOSTON...BRENTWOOD...CLIFTY...ELKINS...
  FORUM...HINDSVILLE...JAPTON...PETTIGREW...SAINT PAUL...WESLEY...
  WINSLOW AND WITTER.

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.

&&

LAT...LON 3577 9356 3578 9422 3621 9410 3621 9402
      3624 9401 3623 9387 3631 9387 3631 9366
      3628 9366 3627 9365 3621 9363

$$

2 follow-up statements

215 
WGUS74 KTSA 201811
FFSTSA

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
111 PM CDT FRI MAY 20 2011

ARC087-143-201930-
/O.CON.KTSA.FF.W.0031.000000T0000Z-110520T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MADISON AR-WASHINGTON AR-
111 PM CDT FRI MAY 20 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN WASHINGTON AND
MADISON COUNTIES IN NORTHWEST ARKANSAS UNTIL 230 PM CDT...

AT 109 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAIN OVER THE WARNED AREA. 2 TO 4 
INCHES OF RAINFALL HAS ALREADY OCCURRED THROUGH THE MORNING AND 
EARLY AFTERNOON HOURS 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...
HUNTSVILLE...AURORA...BOSTON...BRENTWOOD...CLIFTY...ELKINS...FORUM...
HINDSVILLE...JAPTON...PETTIGREW...SAINT PAUL...WESLEY...WINSLOW AND
WITTER.

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.

&&

LAT...LON 3577 9356 3578 9422 3621 9410 3621 9402
      3624 9401 3623 9387 3631 9387 3631 9366
      3628 9366 3627 9365 3621 9363

$$

467 
WGUS74 KTSA 201927
FFSTSA

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
227 PM CDT FRI MAY 20 2011

ARC087-143-201941-
/O.EXP.KTSA.FF.W.0031.000000T0000Z-110520T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MADISON AR-WASHINGTON AR-
227 PM CDT FRI MAY 20 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN WASHINGTON
AND MADISON COUNTIES IN NORTHWEST ARKANSAS WILL BE ALLOWED TO EXPIRE
AT 230 PM CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED 
AREA...ALTHOUGH LIGHT RAIN COULD AFFECT THE AREA THROUGH 4 PM. 
STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING 
TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN 
OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3577 9356 3578 9422 3621 9410 3621 9402
      3624 9401 3623 9387 3631 9387 3631 9366
      3628 9366 3627 9365 3621 9363

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:07 AM CDT	Special Weather Statement	TSA	Crawford, Washington	23 min
May 20, 8:32 AM CDT	Special Weather Statement	TSA	Benton, Carroll, Madison, Washington	58 min
May 20, 8:50 AM CDT	Special Weather Statement	TSA	Sebastian	40 min
May 20, 9:08 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	67 min
May 20, 9:36 AM CDT	Special Weather Statement	TSA	Franklin	24 min
May 20, 10:15 AM CDT	Areal Flood Advisory	TSA	Carroll, Madison	60 min
May 20, 11:12 AM CDT	Flash Flood Watch	TSA	Benton, Carroll, Madison, Washington	16 hr
May 20, 11:16 AM CDT	Special Weather Statement	TSA	Benton, Washington	59 min
May 20, 11:19 AM CDT	Special Weather Statement	TSA	Crawford, Washington	26 min
May 20, 11:35 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Sebastian	55 min
May 20, 11:54 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Madison, Washington	66 min
May 20, 12:30 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Sebastian	60 min
May 20, 12:38 PM CDT	Severe Thunderstorm Warning	TSA	Carroll, Madison	82 min
May 20, 12:56 PM CDT	Severe Thunderstorm Warning	TSA	Madison, Washington	94 min
May 20, 1:18 PM CDT	Areal Flood Advisory	TSA	Crawford, Franklin, Sebastian	57 min
May 20, 1:27 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Sebastian	63 min
May 20, 5:22 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	68 min
May 20, 5:38 PM CDT	Special Weather Statement	TSA	Crawford	52 min
May 20, 5:52 PM CDT	Areal Flood Advisory	TSA	Benton, Crawford, Franklin, Sebastian, Washington	53 min
May 20, 6:14 PM CDT	Special Weather Statement	TSA	Crawford, Franklin, Madison	61 min
May 20, 6:42 PM CDT	Special Weather Statement	TSA	Carroll, Madison	63 min

Nearby

Flash Flood Warnings in Arkansas, 2011 Every flash flood warning in 2011

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.