Alert archive / Arkansas / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 99, NWS Tulsa, OK

April 11, 2005Benton County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 11, 2005, 2:26 PM CDT for Benton County, Arkansas. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 11, 2005, 2:26 PM CDT (19:26 UTC)
Expired: Apr 11, 2005, 3:30 PM CDT
In force: 64 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Benton County, AR

The radar

The Western Arkansas radar (KSRX), 115 km from the middle of the area, began a volume at 19:29 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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

Springfield, MO (KSGF), launched 12:00Z, 7.4 hours before the alert went out and 74 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: 255 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 765 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 111926
SVRTSA
ARC007-112030-
/O.NEW.KTSA.SV.W.0099.050411T1926Z-050411T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
226 PM CDT MON APR 11 2005

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BENTON COUNTY IN NORTHWEST ARKANSAS

* UNTIL 330 PM CDT

* AT 224 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED 5 MILES SOUTHEAST OF HIGHFILL...MOVING NORTHEAST
  AT 15 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...CAVE
  SPRINGS...LOWELL...BENTONVILLE...ROGERS...GARFIELD...GATEWAY AND
  PEA RIDGE.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3621 9445 3616 9427 3640 9378 3660 9401

$$

4 follow-up statements

000 
WWUS54 KTSA 111948
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
247 PM CDT MON APR 11 2005

ARC007-112030-
/O.CON.KTSA.SV.W.0099.000000T0000Z-050411T2030Z/
BENTON AR-
247 PM CDT MON APR 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 330 PM CDT FOR
BENTON COUNTY...

AT 241 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL.  THIS STORM
WAS LOCATED NEAR CAVE SPRINGS...MOVING NORTHEAST AT 15 MPH.  THIS 
STORM HAS SHOWN WEAK ROTATION AND PRODUCED A BRIEF FUNNEL NEAR 
HIGHFILL.

SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...LOWELL...
BENTONVILLE...ROGERS AND MONTE NE.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3629 9432 3620 9426 3626 9400 3644 9416

$$

000 
WWUS54 KTSA 112002
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
302 PM CDT MON APR 11 2005

ARC007-112030-
/O.CON.KTSA.SV.W.0099.000000T0000Z-050411T2030Z/
BENTON AR-
302 PM CDT MON APR 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 330 PM CDT FOR
BENTON COUNTY...

AT 258 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL.  THIS STORM
WAS LOCATED 4 MILES SOUTHWEST OF ROGERS...MOVING NORTHEAST AT 15 MPH.

SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...ROGERS.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3632 9424 3626 9420 3633 9402 3642 9409

$$

000 
WWUS54 KTSA 112021
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
321 PM CDT MON APR 11 2005

ARC007-112030-
/O.CON.KTSA.SV.W.0099.000000T0000Z-050411T2030Z/
BENTON AR-
321 PM CDT MON APR 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 330 PM CDT FOR
BENTON COUNTY...

AT 317 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL.  THIS STORM
WAS LOCATED 3 MILES SOUTHWEST OF AVOCA...MOVING NORTHEAST AT 20 MPH.

SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...AVOCA...GARFIELD
AND HILL TOP.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3637 9418 3634 9411 3648 9392 3651 9400

$$

000 
WWUS54 KTSA 112027
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
327 PM CDT MON APR 11 2005

ARC007-112037-
/O.EXP.KTSA.SV.W.0099.000000T0000Z-050411T2030Z/
BENTON AR-
327 PM CDT MON APR 11 2005

...THE SEVERE THUNDERSTORM WARNING FOR BENTON COUNTY EXPIRES AT 330
PM CDT...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE 
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE. GUSTY 
WINDS...SMALL HAIL AND BRIEF HEAVY RAIN WILL STILL BE POSSIBLE WITH 
THIS STORM AS IT MOVES INTO NORTHEAST BENTON COUNTY.

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

LAT...LON 3637 9418 3634 9411 3648 9392 3651 9400

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Apr 11, 2:00 PM CDT, 26 minutes earlier.

Area forecast discussion, Apr 11, 2:00 PM CDT, 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
200 PM CDT MON APR 11 2005

.MESOSCALE DISCUSSION...
MOIST CONVECTION HAS DEVELOPED ALONG THE ARKANSAS AND OKLAHOMA
BORDER JUST HEAD OF THE DRY LINE WHERE CAP INDECES WERE WEAKEST AND
LIFTED INDICES DROPPED TO AROUND -5.  THE CELLS ARE BENEATH THE
300MB WIND MAX AND TRYING TO WORK WITH ABOUT 100 MB OF MOISTURE
DEPTH.  THIS CONVECTION WILL STRUGGLE IN THE BALANCE BETWEEN THE
HIGH SHEAR AND SHALLOW MOISTURE.  WE HAVE NOTED A WEAK ELEVATED
MESOCYCLONE IN THE WASHINGTON COUNTY CELL.  IF A MESOCYCLONE CAN
BECOME ESTABLISHED THEN THE UPDRAFT WOULD BE AUGMENTED AND A SEVERE
THREAT WOULD MATERIALIZE.

AS COLD AIR ALOFT SPREADS TOWARD THE DRY LINE...THUNDERSTORMS MAY
DEVELOP SOUTHWARD AND AFFECT FAR NORTHEAST OKLAHOMA.

THE RAPID UPDATE CYCLE RUNS SHOW INCREASING DOWNWARD MOTION IN
SOUTHEAST OKLAHOMA AND THIS MAY BE LIMITING THE STORM POTENTIAL
SOUTH OF I-40.

Hazardous weather outlook, Apr 11, 12:40 PM CDT, 1 hour 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
1240 PM CDT MON APR 11 2005

ARZ001-002-010-011-019-020-029-OKZ049-053>076-121000-
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-
1240 PM CDT MON APR 11 2005

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

.DAY ONE...TODAY AND TONIGHT.
TORNADO.
	RISK...LIMITED.
        AREA....NORTHWEST ARKANSAS.
        ONSET...LATE AFTERNOON AND EVENING.

SEVERE THUNDERSTORM.
	RISK...ELEVATED.
	AREA...FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...LATE AFTERNOON AND EVENING.

	AREA AT GREATEST RISK...NORTHWEST ARKANSAS.

FIRE WEATHER DANGER.
	RISK...ELEVATED...SPREADINDEX=46.
	AREA...EASTERN OKLAHOMA.
	ONSET...AFTERNOON.

DISCUSSION...
A COLD FRONT/DRYLINE IS CURRENTLY DRAPED NORTH TO SOUTH ACROSS THE
EASTERN PORTION OF THE FORECAST AREA. MOIST AND UNSTABLE AIR IS
RESIDING TO THE EAST OF THIS LINE IN EXTREME EASTERN OKLAHOMA AND
WESTERN ARKANSAS.

THINNING CLOUDS DURING THE AFTERNOON OVER AT LEAST SE
OKLAHOMA WILL ADD SOME SURFACE HEATING TO AN ALREADY UNSTABLE AIR
MASS. THIS COULD ALLOW A FEW STORMS TO DEVELOP AND MOVE
NORTHEASTWARD. WITH GOOD SHEAR AND INSTABILITY IN THIS REGION...
WOULD EXPECT ANY STORMS THAT DEVELOP TO REACH SEVERE LIMITS.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND EVENING.

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

EXTENDED DISCUSSION...
THERE WILL BE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS ON TUESDAY
AS THE AREA REMAINS UNDER THE INFLUENCE OF THE UPPER LEVEL LOW AS
IT MOVES OUT OF NORTHEAST OKLAHOMA AND INTO MISSOURI.

THERE WILL BE ANOTHER CHANCE OF SHOWERS AND THUNDERSTORMS FRIDAY NIGHT
INTO SATURDAY AS ANOTHER FRONTAL BOUNDARY APPROACHES THE AREA.

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

In the hours before

Local storm report, Apr 11, 8:59 AM CDT, 5 hours 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
859 AM CDT MON APR 11 2005

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

0415 AM     HAIL             CAMERON                 35.13N 94.53W
04/11/2005  0.75 INCH        LE FLORE           OK   POST OFFICE

&&

MEB

Local storm report, Apr 11, 10:53 AM CDT, 3 hours 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1053 AM CDT MON APR 11 2005

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

0943 PM     HAIL             GOWEN                   34.88N 95.48W
04/10/2005  0.75 INCH        LATIMER            OK   LAW ENFORCEMENT

            REPORTED BY WILBURTON PD

&&

RBD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 4:08 AM CDT	Severe Thunderstorm Warning	TSA	Sebastian	52 min
Apr 11, 3:56 PM CDT	Tornado Warning	TSA	Franklin	34 min
Apr 11, 4:50 PM CDT	Severe Thunderstorm Warning	TSA	Franklin	55 min
Apr 11, 5:14 PM CDT	Severe Thunderstorm Warning	TSA	Carroll	61 min
Apr 11, 5:42 PM CDT	Tornado Warning	TSA	Carroll	48 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2005 Every severe thunderstorm warning in 2005

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.