Alert archive / Arkansas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 11, NWS Tulsa, OK

January 7, 2008Benton County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Jan 7, 2008, 11:45 PM CST for Benton County, Arkansas. It was in force for 35 min. 1 report 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: Jan 7, 2008, 11:45 PM CST (05:45 UTC)
Expired: Jan 8, 2008, 12:20 AM CST
In force: 35 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County Benton County, AR

The radar

The Tulsa radar (KINX), 103 km from the middle of the area, began a volume at 05:48 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
Jan 7, 11:55 PM CST	HAIL 0.75	3 Sw Bella Vista, AR

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

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 watch it was issued in

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

Issued	Product	Office	Lasted
Jan 7, 7:48 PM CST	Tornado Watch PDS	SPC	9 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 5.8 hours before the alert went out and 83 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: 765 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 955 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 281 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 7.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 080545
SVRTSA
ARC007-080645-
/O.NEW.KTSA.SV.W.0011.080108T0545Z-080108T0645Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1145 PM CST MON JAN 7 2008

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

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

* UNTIL 1245 AM CST

* AT 1141 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL AND WINDS
  TO 60 MPH. THIS STORM WAS LOCATED NEAR DECATUR...MOVING NORTHEAST
  AT 45 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...HIWASSE...
  BENTONVILLE...BELLA VISTA AND PEA RIDGE.

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

LAT...LON 3649 9394 3615 9455 3616 9456 3628 9458
      3630 9457 3632 9459 3648 9461 3650 9460
TIME...MOT...LOC 0545Z 230DEG 41KT 3636 9439

$$

2 follow-up statements

000 
WWUS54 KTSA 080607
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1207 AM CST TUE JAN 8 2008

ARC007-080645-
/O.CON.KTSA.SV.W.0011.000000T0000Z-080108T0645Z/
BENTON AR-
1207 AM CST TUE JAN 8 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CST
FOR NORTHERN BENTON COUNTY...

AT 1203 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL
AND WINDS TO 60 MPH. THIS STORM WAS LOCATED NEAR PEA RIDGE...MOVING
NORTHEAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

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

LAT...LON 3649 9394 3631 9425 3632 9428 3648 9442
TIME...MOT...LOC 0607Z 230DEG 41KT 3646 9412

$$

000 
WWUS54 KTSA 080620
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1221 AM CST TUE JAN 8 2008

ARC007-080631-
/O.CAN.KTSA.SV.W.0011.000000T0000Z-080108T0645Z/
BENTON AR-
1221 AM CST TUE JAN 8 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BENTON COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA...THEREFORE THE
SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3649 9394 3631 9425 3632 9428 3648 9442
TIME...MOT...LOC 0621Z 230DEG 41KT 3656 9397

$$

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 Jan 7, 10:49 PM CST, 56 minutes earlier.

Area forecast discussion, Jan 7, 10:49 PM CST, 56 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1049 PM CST MON JAN 7 2008

.MESOSCALE UPDATE...
SURFACE TEMPERATURES HAVE REMAINED STEADY OR HAVE RISEN
A COUPLE OF DEGREES IN THE LAST HOUR...SO THE ATMOSPHERE
HAS DESTABILIZED FURTHER SOUTH OF THE BAND OF SUPERCELLS
THAT EXTENDS ACROSS NORTHEAST OKLAHOMA AND THE NORTHWEST
TIP OF ARKANSAS.  THE LIFTED INDEX HAS LOWERED TO -3 WITH
SURFACE BASED CAPE STILL BETWEEN 1000 AND 1500 J/KG.

DEEP-LAYER AND LOW-LEVEL SHEAR VALUES REMAIN HIGH ALONG
AND SOUTH OF THE SUPERCELLS WITH STORM-RELATIVE HELICITY
BETWEEN 200 AND 375 M2/S2.  THEREFORE SUPERCELL STORM
STRUCTURES WILL CONTINUE WITHIN THE BAND.

ELEVATED CONVECTION IS DEVELOPING IN EAST-CENTRAL OKLAHOMA
AND WESTERN ARKANSAS AND IT IS EXPECTED TO CONTINUE TO
INCREASE AS THE MAIN UPPER SYSTEM APPROACHES.  ANY OF THESE
CELLS HAVE THE POTENTIAL TO ROOT IN THE BOUNDARY LAYER. IF A
CELL DOES BECOME ESTABLISHED IT WOULD RAPIDLY BECOME A SUPERCELL.
ALL INTERESTS IN THESE AREAS SHOULD CLOSELY MONITOR RADAR TRENDS
FOR SUDDEN STORM ORGANIZATION.

AT 10PM...ANALYSIS GRIDS SHOW THAT STORM MOTIONS ARE MORE
ALIGNED WITH MID-LEVEL FLOW AND STORM-RELATIVE WINDS AREA
DECREASING.  THE RESULT IS EXPECTED TO A DROP IN THE
TORNADO POTENTIAL WITH THE EXISTING CELLS...BUT THE THREAT IS
NOT TOTALLY GONE.  FURTHER THE SHEAR IN THE LOWEST KM OF THE
ATMOSPHERE IS HIGH AND TRANSITORY BUT STRONG LOW-LEVEL
ROTATIONS COULD OCCUR WITH ANY STORM.  THE ARKANSAS RIVER
VALLEY WILL NEED TO BE MONITORED CLOSELY FOR THESE TYPES
OF CIRCULATIONS.

THE SURFACE LOW IS DEVELOPING INTO OSAGE COUNTY AT THIS
TIME AND THE COLD FRONT WILL BEGIN TO ACCELERATE SOUTHEAST.
THUNDERSTORMS...SOME SEVERE WILL OCCUR WITH THE COLD FRONT
AS IT SWEEPS OVER THE REGION DURING THE OVERNIGHT HOURS.

&&

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

SHORT TERM...08

Hazardous weather outlook, Jan 7, 8:40 PM CST, 3 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
840 PM CST MON JAN 7 2008

ARZ001-002-010-011-019-020-029-OKZ049-053>076-081100-
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-
840 PM CST MON JAN 7 2008

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.
TORNADO.
	RISK...SIGNIFICANT.
	AREA...NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...ONGOING

	AREA AT GREATEST RISK...MOST OF EASTERN OKLAHOMA...NORTHWEST AND
        WEST CENTRAL ARKANSAS.

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

	AREA AT GREATEST RISK...FAR NORTHEAST OKLAHOMA AND
        NORTHWEST AND WEST CENTRAL ARKANSAS.

FLASH FLOODING.
        RISK...ELEVATED.
	AREA...PARTS OF EASTERN OKLAHOMA AND PARTS NORTHWEST
               ARKANSAS.
        ONSET...TONIGHT

DISCUSSION...
STRONG TO SEVERE THUNDERSTORMS CONTINUE ACROSS PARTS OF EASTERN
OKLAHOMA AND NORTHWEST ARKANSAS THIS EVENING. THE UPPER SYSTEM HAS
MOVED CLOSER THE REGION...AND SURFACE WINDS HAVE BACKED THIS EVENING
IN RESPONSE TO THE APPROACHING UPPER SYSTEM AND DEVELOPING SURFACE
LOW ACROSS THE TEXAS PANHANDLE. AS A RESULT...FAST MOVING...ROTATING
SUPERCELLS HAVE CONTINUED TO TRAIN WITHIN THE INSTABILITY/MOIST
AXIS. THE INSTABILITY AXIS WILL EVENTUALLY GET PUSHED EAST LATER
TONIGHT AS THE UPPER SYSTEM MOVES ACROSS THE SOUTHERN PLAINS...WHICH
WILL PUSH A SURFACE COLD FRONT INTO NORTHEAST OKLAHOMA FROM THE
NORTHWEST. ADDITIONALLY...FLASH FLOODING FROM THESE TRAINING CELLS
OVER PARTS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS IS A
POSSIBILITY THIS EVENING AND OVERNIGHT.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...SPOTTER
ACTIVATION WILL BE NEEDED...ESPECIALLY ACROSS FAR NORTHEAST OKLAHOMA
AND NORTHWEST ARKANSAS. STORM MOTIONS WILL LIKELY BE TOO FAST TO
TRACK INDIVIDUALLY...THEREFORE CONSTRUCT YOUR SPOTTER PLACEMENT
ACCORDINGLY.

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

EXTENDED DISCUSSION...
GUSTY NORTHWESTERLY WINDS WILL DEVELOP ON TUESDAY IN
WAKE OF THE DEPARTING STORM SYSTEM...WITH GUSTS OF
25 TO 35 MPH BEING COMMON.  A MORE TRANQUIL WEATHER
PATTERN IS EXPECTED FOR THE REMAINDER OF THE WEEK.

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

In the hours before

Local storm report, Jan 7, 10:00 PM CST, 1 hour 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1000 PM CST MON JAN 07 2008

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

0924 PM     HAIL             HENRYETTA               35.44N 95.98W
01/07/2008  E1.00 INCH       OKMULGEE           OK   EMERGENCY MNGR

0945 PM     FLASH FLOOD      WELEETKA                35.34N 96.14W
01/07/2008                   OKFUSKEE           OK   PUBLIC

            WATER STANDING ON SOME ROADS FROM WELEETKA TO PHAROAH

&&

SAA

Special weather statement, Jan 7, 10:07 PM CST, 1 hour 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1007 PM CST MON JAN 7 2008

OKZ054-059-080500-
OSAGE OK-PAWNEE OK-
1007 PM CST MON JAN 7 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1100 PM CST
FOR THE FOLLOWING COUNTIES...

IN NORTHEAST OKLAHOMA
     OSAGE AND WESTERN PAWNEE

AT 1007 PM CST...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 25 MILES NORTHWEST OF APPERSON TO 23 MILES WEST
OF RALSTON...MOVING NORTHEAST AT 45 MPH. SOME LOCATIONS THAT WILL BE
AFFECTED BY THESE STORMS INCLUDE...PAWHUSKA...SHIDLER...FAIRFAX...
BURBANK...APPERSON...WEBB CITY...PEARSONIA...BIGHEART...FORAKER...
GRAINOLA...PAWNEE...BLACKBURN...SKEDEE AND RALSTON.

THESE STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 50 MPH.

LAT...LON 3700 9599 3616 9680 3624 9683 3625 9691
      3632 9693 3634 9703 3651 9706 3658 9691
      3657 9703 3669 9708 3673 9704 3670 9695
      3677 9689 3680 9676 3700 9674
TIME...MOT...LOC 0407Z 224DEG 41KT 3698 9712 3660 9711

Local storm report, Jan 7, 10:34 PM CST, 1 hour 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1034 PM CST MON JAN 07 2008

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

1010 PM     TSTM WND GST     8 W MUSKOGEE            35.75N 95.51W
01/07/2008  E65.00 MPH       MUSKOGEE           OK   LAW ENFORCEMENT

            ALSO 0.5 INCH HAIL

1015 PM     TSTM WND GST     9 W CLEARVIEW           35.40N 96.35W
01/07/2008  E65.00 MPH       OKFUSKEE           OK   PUBLIC

1025 PM     TSTM WND GST     BURBANK                 36.69N 96.73W
01/07/2008  E55.00 MPH       OSAGE              OK   PUBLIC

&&

SAA

Local storm report, Jan 7, 10:40 PM CST, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1040 PM CST MON JAN 07 2008

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

1020 PM     FLASH FLOOD      3 SW PEGGS              36.05N 95.14W
01/07/2008                   CHEROKEE           OK   PUBLIC

            WATER 2 TO 3 FEET DEEP FLOWING OVER ROAD

&&

SAA

Local storm report, Jan 7, 10:51 PM CST, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1051 PM CST MON JAN 07 2008

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

0859 PM     TORNADO          ROGERS                  36.33N 94.12W
01/07/2008                   BENTON             AR   EMERGENCY MNGR

            BENTON CO EOC REPORTS TORADO TOUCHDOWN OFF HIGHWAY 12 IN
            ROGERS AREA. SEVERAL TREES DOWN ON BIRGANTZE STREET.

&&

SAA

Local storm report, Jan 7, 11:24 PM CST, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1124 PM CST MON JAN 07 2008

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

1058 PM     HAIL             CHEROKEE CITY           36.30N 94.58W
01/07/2008  E1.00 INCH       BENTON             AR   EMERGENCY MNGR

&&

SAA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 7, 7:14 PM CST	Tornado Warning	TSA	Benton	31 min
Jan 7, 7:42 PM CST	Tornado Warning	TSA	Benton	48 min
Jan 7, 8:09 PM CST	Tornado Warning	TSA	Benton, Washington	66 min
Jan 7, 8:24 PM CST	Flash Flood Warning	TSA	Benton, Washington	4 hr
Jan 7, 8:54 PM CST	Tornado Warning	TSA	Benton	66 min
Jan 7, 9:57 PM CST	Tornado Warning	TSA	Benton	63 min
Jan 7, 10:45 PM CST	Tornado Warning	TSA	Benton	60 min
Jan 8, 12:38 AM CST	Tornado Warning	TSA	Benton	19 min
Jan 8, 1:15 AM CST	Severe Thunderstorm Warning	TSA	Benton	60 min
Jan 8, 2:11 AM CST	Flash Flood Warning	TSA	Benton	3 hr
Jan 8, 2:17 AM CST	Severe Thunderstorm Warning	TSA	Benton, Carroll	58 min
Jan 8, 2:58 AM CST	Special Weather Statement	TSA	Washington	32 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2008 Every severe thunderstorm warning in 2008

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.