Alert archive / Arkansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 169, NWS Tulsa, OK

May 1, 20094 counties in Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at May 1, 2009, 9:50 PM CDT for 4 counties in Arkansas. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 1, 2009, 9:50 PM CDT (02:50 UTC)
Expired: May 1, 2009, 10:45 PM CDT
In force: 55 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Crawford County, AR, Franklin County, AR, Madison County, AR, Washington County, AR

The radar

The Western Arkansas radar (KSRX), 62 km from the middle of the area, began a volume at 02:53 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 1, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.8 hours before the alert went out and 127 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: 8 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 445 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 321 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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 May 1, 9:18 PM CDT, 32 minutes earlier.

Area forecast discussion, May 1, 9:18 PM CDT, 32 minutes before

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Hazardous weather outlook, May 1, 5:14 PM CDT, 4 hours 36 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
514 PM CDT FRI MAY 1 2009

ARZ001-002-010-011-019-020-029-OKZ049-053>076-021000-
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-
515 PM CDT FRI MAY 1 2009

...DANGEROUS FLASH FLOODING POSSIBLE OVER THE WEEKEND...

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

.DAY ONE...THIS EVENING AND TONIGHT.

SEVERE THUNDERSTORM.
RISK...LIMITED.
AREA...ALL EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING.

FLASH FLOOD.
RISK...SIGNIFICANT.
AREA...NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING.

AREA AT GREATEST RISK...NORTHEAST OKLAHOMA.

HEAVY RAIN.
RISK...LIMITED.
AREA...NORTHEAST OKLAHOMA INTO FAR NORTHWEST ARKANSAS.
ONSET...ONGOING...INCREASING AGAIN LATE TONIGHT.

DISCUSSION...
SCATTERED STRONG TO SEVERE THUNDERSTORMS CONTINUE THIS AFTERNOON
AS A STRONG COLD FRONT SLIDES SLOWLY SOUTHWARD INTO THE FORECAST
AREA.  THE PRIMARY SEVERE WEATHER THREAT HAS BEEN FROM LARGE
HAIL.  EARLIER TODAY...WIDESPREAD EXCESSIVE RAINFALL IMPACTED
MUCH OF NORTHEAST OKLAHOMA WITH LOCALIZED AREAS RECEIVING IN
EXCESS OF 7 INCHES OF RAIN.  WITH ADDITIONAL ROUNDS OF HEAVY
RAINS EXPECTED LATER TONIGHT INTO SATURDAY...THE RISK OF
WIDESPREAD FLASH FLOODING EXISTS ESPECIALLY OVER NORTHEAST
OKLAHOMA.  ALL INTERESTS SHOULD REMAIN ALERT FOR ANY FLASH
FLOOD WARNINGS AS VERY LITTLE RAINFALL WILL BE REQUIRED FOR
DANGEROUS FLOODING TO DEVELOP.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED ESPECIALLY OVER NORTHWEST
ARKANSAS THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
SATURDAY...SEVERE THUNDERSTORM POTENTIAL...HEAVY RAIN POTENTIAL.
SUNDAY...THUNDERSTORM POTENTIAL...HEAVY RAIN POTENTIAL.
MONDAY...NO HAZARDS.
TUESDAY THROUGH THURSDAY...THUNDERSTORM POTENTIAL.

EXTENDED DISCUSSION...
WIDESPREAD THUNDERSTORMS ARE EXPECTED BOTH SATURDAY AND SUNDAY
AS A SLOW MOVING COLD FRONT REMAINS ACROSS THE AREA.  THE MOST
LIKELY IMPACTS WILL BE FROM CONTINUED EXCESSIVE RAINFALL WITH
DANGEROUS FLASH FLOODING POSSIBLE.  IN ADDITION TO THE FLASH
FLOODING...SEVERAL AREA MAIN STEM RIVERS ARE LIKELY TO REMAIN
IN FLOOD WITH ASSOCIATED ROAD CLOSURES POSSIBLE.  SCATTERED
SEVERE WEATHER WILL ALSO BE POSSIBLE PRIMARILY ALONG AND SOUTH
OF THE FRONTAL BOUNDARY.  A BRIEF DRY PERIOD FOR EARLY NEXT WEEK
BEFORE THUNDERSTORM CHANCES RETURN FOR THE MAJORITY OF THE
WORK WEEK.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
RAPID ONSET OF FLASH FLOODING IS LIKELY GIVEN THE RECENT
HEAVY RAINS.  RESPONSES FOR BOTH FLOODING AND SEVERE
WEATHER MAY BE REQUIRED OVER THE NEXT WEEK.

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

In the hours before

Local storm report, May 1, 6:55 PM CDT, 2 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
655 PM CDT FRI MAY 01 2009

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

0630 PM     HAIL             HINDSVILLE              36.14N 93.86W
05/01/2009  E1.75 INCH       MADISON            AR   PUBLIC

&&

JBM

Special weather statement, May 1, 7:18 PM CDT, 2 hours 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
718 PM CDT FRI MAY 1 2009

ARZ001-010-020100-
BENTON AR-WASHINGTON AR-
718 PM CDT FRI MAY 1 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 800 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHWEST ARKANSAS
     NORTHERN WASHINGTON AND SOUTHERN BENTON

AT 718 PM CDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
SAVOY...MOVING EAST AT 25 MPH. SOME LOCATIONS THAT WILL BE AFFECTED
BY THIS STORM INCLUDE...ROCKY COMFORT...SHADY GROVE...HARMON...
ROGERS...LOWELL...HEALING SPRINGS...CAVE SPRINGS...MONTE NE...
FAYETTEVILLE...SPRINGDALE...FARMINGTON...RHEA...VINEY GROVE...
WEDINGTON...SAVOY...GOSHEN...WHEELER...JOHNSON...SONORA...
TONTITOWN...ELM SPRINGS AND OAK GROVE.

THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO
40 MPH.

LAT...LON 3635 9407 3607 9394 3599 9440 3616 9448
TIME...MOT...LOC 0018Z 249DEG 21KT 3611 9433

Local storm report, May 1, 7:20 PM CDT, 2 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
720 PM CDT FRI MAY 01 2009

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

0712 PM     HAIL             AURORA                  36.00N 93.70W
05/01/2009  E1.75 INCH       MADISON            AR   PUBLIC

            GOLF BALL SIZE HAIL COVERING THE GROUND.

&&

GEW

Local storm report, May 1, 7:23 PM CDT, 2 hours 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
723 PM CDT FRI MAY 01 2009

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

0703 PM     HAIL             2 N AURORA              36.03N 93.70W
05/01/2009  E2.50 INCH       MADISON            AR   TRAINED SPOTTER

            HAIL FOUND 10 TO 15 MINUTES AFTER STORM PASSED. RELAYED
            VIA AMATUER RADIO.

&&

JBM

Local storm report, May 1, 7:26 PM CDT, 2 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
726 PM CDT FRI MAY 01 2009

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

0708 PM     TSTM WND DMG     2 NE AURORA             36.02N 93.68W
05/01/2009                   MADISON            AR   TRAINED SPOTTER

            3 INCH DIAMETER TREE LIMBS DOWNED. RELAYED VIA AMATEUR
            RADIO.

&&

JBM

Local storm report, May 1, 7:59 PM CDT, 1 hour 51 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 8:49 PM CDT	River Flood Warning	TSA	Washington	12 hr
May 1, 8:51 PM CDT	River Flood Warning	TSA	Adair	7 hr
May 1, 9:30 PM CDT	Areal Flood Warning	TSA	Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 6 more	12 hr
May 2, 4:15 AM CDT	Special Weather Statement	TSA	Mayes	30 min
May 2, 4:45 AM CDT	Special Weather Statement	TSA	LeFlore	30 min
May 2, 8:49 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	56 min
May 2, 9:29 AM CDT	Special Weather Statement	TSA	Pawnee	31 min
May 2, 9:47 AM CDT	Special Weather Statement	TSA	Pushmataha	43 min
May 2, 10:06 AM CDT	Special Weather Statement	TSA	Latimer	54 min
May 2, 11:27 AM CDT	Special Weather Statement	TSA	Pushmataha	48 min
May 2, 11:32 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	18 min
May 2, 12:16 PM CDT	Special Weather Statement	TSA	Pushmataha	29 min
May 2, 2:25 PM CDT	Areal Flood Advisory	TSA	Pushmataha	2 hr
May 2, 3:01 PM CDT	River Flood Warning	TSA	LeFlore	30 hr
May 2, 3:01 PM CDT	River Flood Warning	TSA	LeFlore	6 days
May 2, 3:16 PM CDT	Special Weather Statement	TSA	Choctaw	44 min
May 2, 3:21 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw	54 min
May 2, 4:07 PM CDT	Flash Flood Warning	TSA	Choctaw, Pushmataha	10 hr
May 2, 4:38 PM CDT	Special Weather Statement	TSA	Pushmataha	37 min
May 1, 7:18 PM CDT	Special Weather Statement	TSA	Benton	42 min
May 1, 7:28 PM CDT	Tornado Warning	TSA	Madison	22 min
May 1, 7:34 PM CDT	Severe Thunderstorm Warning	TSA	Madison	43 min
May 1, 7:42 PM CDT	Flash Flood Warning	TSA	Madison	4 hr
May 1, 9:05 PM CDT	River Flood Watch	TSA	Crawford, Sebastian	21 hr
May 1, 9:38 PM CDT	Areal Flood Advisory	TSA	Crawford, Franklin, Madison, Washington	112 min
May 1, 11:51 PM CDT	Areal Flood Warning	TSA	Madison, Washington	8 hr
May 2, 2:59 PM CDT	River Flood Warning	TSA	Crawford, Sebastian	42 hr
May 2, 3:23 PM CDT	Areal Flood Advisory	TSA	Franklin, Sebastian	112 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2009 Every severe thunderstorm warning 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.