Alert archive / Arkansas / Special Weather Statements in 2011

Special Weather Statement, NWS Tulsa, OK

April 21, 2011Sebastian County, Arkansas

NWS Tulsa, OK issued this special weather statement at Apr 21, 2011, 6:02 PM CDT for Sebastian County, Arkansas. It was in force for 28 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 21, 2011, 6:02 PM CDT (23:02 UTC)
Expired: Apr 21, 2011, 6:30 PM CDT
In force: 28 min
Issued by: NWS Tulsa, OK

County Sebastian County, AR

The radar

The Western Arkansas radar (KSRX), 35 km from the middle of the area, began a volume at 23:05 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, 11.0 hours before the alert went out and 179 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1583 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 21, 3:50 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Apr 21, 3:50 PM CDT, 2 hours 12 minutes before

AREA FORECAST DISCUSSION...RETRANSMISSION
NATIONAL WEATHER SERVICE TULSA OK
350 PM CDT THU APR 21 2011

.DISCUSSION...
ACTIVE SPRING WEATHER PATTERN WILL CONTINUE FOR THE NEXT FEW DAYS
WITH MULTIPLE ROUNDS OF SEVERE WEATHER POSSIBLE...INCLUDING THE
THREAT FOR HEAVY RAINFALL/SIGNIFICANT FLOODING THROUGH MONDAY OR
EVEN TUESDAY.

IN THE SHORT TERM...ELEVATED SEVERE STORMS WILL CONTINUE OVER FAR
EASTERN OKLAHOMA/NORTHWEST ARKANSAS THROUGH AT LEAST EARLY EVENING
WITH A LARGE HAIL THREAT. THE MAIN THUNDERSTORM ACTIVITY SHOULD
BEGIN TO LIFT NORTHEAST OF THE AREA OVERNIGHT AS WARM SECTOR
BEGINS TO SURGE NORTH. GIVEN THIS SCENARIO...WILL HOLD OFF ON
ISSUING A FLASH FLOOD WATCH FOR NORTHEAST OKLAHOMA TONIGHT.
BELIEVE THE MAIN FLOODING THREAT WILL DEVELOP LATE FRIDAY
AFTERNOON INTO FRIDAY NIGHT AS FRONTAL BOUNDARY STALLS NEAR OR
JUST SOUTH OF INTERSTATE 44. AS FRONTAL TIMING/LOCATION OF THE
HEAVIER RAINFALL AXIS BECOMES MORE CERTAIN...A FLASH FLOOD WATCH
WILL LIKELY BE REQUIRED FOR PORTIONS OF NORTHEAST OKLAHOMA/NORTHWEST
ARKANSAS FRIDAY INTO THE WEEKEND. IN ADDITION TO THE FLOODING
THREAT...INITIAL THUNDERSTORM DEVELOPMENT ALONG THE FRONT FRIDAY
AFTERNOON/EVENING WILL POSE A SEVERE THREAT WITH LARGE
HAIL/DAMAGING WINDS POSSIBLE.

FRONT WILL REMAIN QUASI-STATIONARY OVER THE AREA SATURDAY BEFORE
BRIEFLY LIFTING NORTH EARLY SUNDAY IN ADVANCE OF NEXT UPPER LEVEL
WAVE. ANOTHER ROUND OF SEVERE WEATHER/FLOODING WILL BE POSSIBLE
AS SURFACE LOW BEGINS TO LIFT NORTHEAST TOWARDS THE GREAT LAKES
REGION MONDAY WITH COLD FRONT PUSHING THROUGH MOST AREAS BY MONDAY
EVENING. OPERATIONAL MODELS TRY TO DEVELOP SECONDARY SURFACE LOW
ALONG FRONT INTO TUESDAY WITH A CONTINUED CHANCE OF THUNDERSTORMS
BEFORE UPPER LEVEL SYSTEM FINALLY SHIFTS EAST BY MID WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   62  81  59  67 /  60  30  60  50
FSM   58  83  64  77 /  30  40  50  50
MLC   65  82  67  76 /  40  30  50  30
BVO   60  79  54  66 /  70  40  50  50
FYV   60  78  60  70 /  50  30  60  50
BYV   59  78  57  69 /  60  30  60  50
MKO   61  80  61  70 /  50  30  60  50
MIO   61  78  54  66 /  70  40  60  50
F10   63  81  63  70 /  50  30  60  50
HHW   65  84  69  81 /  30  20  30  30

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
AR...NONE.
&&

SHORT TERM...06
LONG TERM....12

Hazardous weather outlook, Apr 21, 4:52 PM CDT, 1 hour 10 minutes before

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In the hours before

Special weather statement, Apr 21, 3:46 PM CDT, 2 hours 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
346 PM CDT THU APR 21 2011

ARZ001-212115-
BENTON AR-
346 PM CDT THU APR 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 415 PM CDT
FOR THE FOLLOWING COUNTY...

IN NORTHWEST ARKANSAS
     NORTHWESTERN BENTON

AT 347 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 6 MILES WEST OF
GRAVETTE...MOVING NORTHEAST AT 45 MPH. SOME LOCATIONS THAT WILL BE
AFFECTED BY THIS STORM INCLUDE...MILLER...SULPHUR SPRINGS...
GRAVETTE...PEA RIDGE...CHEROKEE CITY...DECATUR...HIWASSE AND BELLA
VISTA.

THIS STORM WILL BE CAPABLE OF PRODUCING NICKEL SIZE HAIL. RESIDENTS
IN THESE AREAS SHOULD REMAIN ALERT IN CASE THE SIGNIFICANT WEATHER
ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3646 9405 3625 9457 3649 9461 3650 9449
      3650 9406
TIME...MOT...LOC 2047Z 236DEG 40KT 3640 9453

Local storm report, Apr 21, 4:05 PM CDT, 1 hour 57 minutes before

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Local storm report, Apr 21, 4:11 PM CDT, 1 hour 51 minutes before

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Special weather statement, Apr 21, 5:12 PM CDT, 50 minutes before

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Local storm report, Apr 21, 5:53 PM CDT, 9 minutes before

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Special weather statement, Apr 21, 6:02 PM CDT, 0 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
Apr 21, 12:16 AM CDT	Special Weather Statement	TSA	Pushmataha	29 min
Apr 21, 12:17 AM CDT	Special Weather Statement	TSA	Latimer	28 min
Apr 21, 12:25 AM CDT	Special Weather Statement	TSA	Pushmataha	35 min
Apr 21, 12:50 AM CDT	Special Weather Statement	TSA	Pushmataha	25 min
Apr 21, 12:55 AM CDT	Special Weather Statement	TSA	LeFlore	35 min
Apr 21, 12:23 PM CDT	Special Weather Statement	TSA	Sequoyah	37 min
Apr 21, 12:28 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	47 min
Apr 21, 12:47 PM CDT	Special Weather Statement	TSA	Cherokee	43 min
Apr 21, 1:06 PM CDT	Severe Thunderstorm Warning	TSA	Adair	39 min
Apr 21, 1:14 PM CDT	Special Weather Statement	TSA	Pushmataha	46 min
Apr 21, 1:24 PM CDT	Special Weather Statement	TSA	Latimer	51 min
Apr 21, 1:48 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	42 min
Apr 21, 2:11 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	19 min
Apr 21, 2:23 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata, Rogers	52 min
Apr 21, 2:30 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	45 min
Apr 21, 2:55 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Rogers	23 min
Apr 21, 2:56 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	34 min
Apr 21, 3:08 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	52 min
Apr 21, 3:17 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Ottawa	25 min
Apr 21, 3:56 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	49 min
Apr 21, 5:12 PM CDT	Special Weather Statement	TSA	LeFlore	33 min
Apr 21, 5:21 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	39 min
Apr 21, 11:34 AM CDT	Special Weather Statement	TSA	Polk	26 min
Apr 21, 1:40 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Washington	50 min
Apr 21, 1:54 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Washington	51 min
Apr 21, 2:18 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	57 min
Apr 21, 2:24 PM CDT	Severe Thunderstorm Warning	TSA	Benton	29 min
Apr 21, 3:26 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Madison, Washington	24 min
Apr 21, 3:46 PM CDT	Special Weather Statement	TSA	Benton	29 min

Nearby

Special Weather Statements in Arkansas, 2011 Every special weather statement 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.