Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 280, NWS Tulsa, OK

May 7, 2008Adair County, Delaware County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 7, 2008, 8:57 PM CDT for Adair County, Delaware County, Oklahoma. It was in force for 33 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: May 7, 2008, 8:57 PM CDT (01:57 UTC)
Expired: May 7, 2008, 9:30 PM CDT
In force: 33 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Adair County, OK, Delaware County, OK

The radar

The Tulsa radar (KINX), 88 km from the middle of the area, began a volume at 02:00 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 7, 5:28 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.0 hours before the alert went out and 93 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: 29 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 220 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.

000 
WUUS54 KTSA 080157
SVRTSA
OKC001-041-080230-
/O.NEW.KTSA.SV.W.0280.080508T0157Z-080508T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
857 PM CDT WED MAY 7 2008

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ADAIR COUNTY IN NORTHEAST OKLAHOMA
  SOUTHEASTERN DELAWARE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 930 PM CDT

* AT 855 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE HAIL
  AND WINDS TO 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM JAY TO WEST SILOAM SPRINGS...MOVING NORTHEAST AT 40
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...JAY.

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND STAY AWAY FROM
WINDOWS.

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

LAT...LON 3652 9460 3641 9461 3639 9458 3632 9459
      3630 9457 3620 9458 3598 9452 3635 9496
      3668 9464 3667 9462
TIME...MOT...LOC 0157Z 226DEG 38KT 3639 9484 3621 9460

$$

2 follow-up statements

000 
WUUS54 KTSA 080207 CCA
SVRTSA
OKC001-041-080230-
/O.COR.KTSA.SV.W.0280.080508T0157Z-080508T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE TULSA OK
857 PM CDT WED MAY 7 2008

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ADAIR COUNTY IN NORTHEAST OKLAHOMA
  SOUTHEASTERN DELAWARE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 930 PM CDT

* AT 855 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE HAIL
  AND WINDS TO 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM JAY TO WEST SILOAM SPRINGS...MOVING NORTHEAST AT 40
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...JAY.

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND STAY AWAY FROM
WINDOWS.

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

LAT...LON 3652 9460 3641 9461 3639 9458 3632 9459
      3630 9457 3620 9458 3598 9452 3635 9496
      3668 9464 3667 9462
TIME...MOT...LOC 0157Z 226DEG 38KT 3639 9484 3621 9460

$$

000 
WWUS54 KTSA 080226
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
926 PM CDT WED MAY 7 2008

OKC001-041-080236-
/O.EXP.KTSA.SV.W.0280.000000T0000Z-080508T0230Z/
DELAWARE OK-ADAIR OK-
926 PM CDT WED MAY 7 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ADAIR AND
SOUTHEASTERN DELAWARE COUNTIES EXPIRES AT 930 PM CDT...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA AND WEAKENED BELOW
SEVERE LIMITS...THEREFORE THE SEVERE THUNDERSTORM WARNING WILL BE
ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT.

LAT...LON 3652 9460 3641 9461 3639 9458 3632 9459
      3630 9457 3620 9458 3598 9452 3635 9496
      3668 9464 3667 9462
TIME...MOT...LOC 0226Z 226DEG 38KT 3660 9457 3642 9433

$$

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 7, 8:51 PM CDT, 6 minutes earlier.

Area forecast discussion, May 7, 8:51 PM CDT, 6 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
851 PM CDT WED MAY 7 2008

.MESOSCALE UPDATE...
THE LINE OF STORMS IS NOW MOVING PAST THE AXIS OF
BEST SURFACE-BASED INSTABILITY WITH CAPE OF 500 TO
1000 J/KG AHEAD OF THE LINE IN WESTERN ARKANSAS AND FAR
NORTHEAST OKLAHOMA.  SHEAR TO 1 KM REMAINS MODERATE TO
HIGH AHEAD OF THE LINE WITH OCCASIONAL LOW-LEVEL
MESOCYCLONE FORMATION.  SO SOME TORNADO THREAT
CONTINUES.  WE HAVE HAD TREE AND POWER POLE DAMAGE
REPORTED BENEATH SOME OF THESE CIRCULATIONS...BUT
IT WILL TAKE SURVEYS TOMORROW TO DETERMINE IF WE
HAVE HAD ANY TORNADOES.  NONE-THE-LESS THERE IS
AN ENHANCED DAMAGE POTENTIAL BENEATH THE DEEPER AND
MORE PERSISTENT CIRCULATIONS...SO TORNADO WARNINGS
MAY STILL BE REQUIRED ON THE MOST ORGANIZED
VELOCITY SIGNATURES WE SEE.

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH UNTIL 7 AM THURSDAY FOR OKZ054-OKZ055-OKZ056-
     OKZ057-OKZ058-OKZ062-OKZ063.

AR...NONE.
&&

SHORT TERM...08
LONG TERM....99

Hazardous weather outlook, May 7, 8:50 PM CDT, 7 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
850 PM CDT WED MAY 7 2008

ARZ001-002-010-011-019-020-029-OKZ049-053>076-081000-
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-
850 PM CDT WED MAY 7 2008

...SEVERE WEATHER THREAT CONTINUES THIS EVENING...

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

.DAY ONE...TODAY AND TONIGHT.
TORNADO.
	RISK...SIGNIFICANT.
 	AREA...NORTHWEST AND WEST CENTRAL ARKANSAS AND EXTREME NORTHEAST
	       OKLAHOMA.
	ONSET...ONGOING.

	AREA AT GREATEST RISK...NORTHEAST OF A LINE FROM FORT SMITH
		TO VINITA.

SEVERE THUNDERSTORM.
	RISK...SIGNIFICANT.
	AREA...NORTHWEST AND WEST CENTRAL ARKANSAS AND EXTREME
		NORTHEAST OKLAHOMA.
	ONSET...ONGOING.

	AREA AT GREATEST RISK...NORTHEAST OF A LINE FROM FORT SMITH
		TO VINITA.

FLASH FLOOD.
	RISK...LIMITED.
	AREA...NORTHEAST OKLAHOMA.
	ONSET...ONGOING.

HEAVY RAIN.
	RISK...LIMITED.
	AREA...NORTHEAST OKLAHOMA.
	ONSET...ONGOING.

DISCUSSION...
A LINE OF SEVERE THUNDERSTORMS WILL CONTINUE TO RAPIDLY MOVE
NORTHEAST ACROSS NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS THROUGH
MIDNIGHT. DAMAGING STRAIGHT LINE WINDS CONTINUE TO BE ASSOCIATED
WITH THIS COMPLEX...AND LOW LEVEL WIND SHEAR REMAINS SUFFICIENT
FOR TORNADOES TO QUICKLY SPIN UP ON THE LEADING EDGE OF THE SQUALL
LINE. THE SEVERE WEATHER THREAT WILL COME TO AN END AFTER
MIDNIGHT AS THESE STORMS MOVE OFF TO THE NORTHEAST.

THE UPPER LOW RESPONSIBLE FOR THE STORMS WILL CONTINUE TO TRACK
ACROSS THE AREA OVERNIGHT. ADDITIONAL RAIN AND A FEW THUNDERSTORMS
WILL CONTINUE ACROSS NORTHEAST OKLAHOMA AND PARTS OF NORTHWEST
ARKANSAS AFTER MIDNIGHT...WITH A CONTINUED THREAT OF HEAVY
RAINFALL AND FLASH FLOODING.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
SPOTTER ACTIVATION WILL BE NEEDED ALONG AND EAST OF THE SQUALL
LINE UNTIL IT EXITS THE FORECAST AREA AFTER MIDNIGHT. ANY SEVERE
WEATHER FLOODING SHOULD BE REPORTED TO THE NATIONAL WEATHER
SERVICE IN TULSA.

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

EXTENDED DISCUSSION...
A COLD FRONT ASSOCIATED WITH TODAYS LOW PRESSURE SYSTEM
WILL REMAIN IN OUR AREA THE NEXT FEW DAYS KEEPING THUNDERSTORMS
IN THE FORECAST.  THE BEST CHANCE FOR SEVERE WEATHER WILL BE
WITH AN UPPER LEVEL SYSTEM LATE SATURDAY OR SATURDAY NIGHT...IF
SUFFICIENT MOISTURE CAN RETURN AHEAD OF THE SYSTEM. ANOTHER FRONT
WILL MOVE THROUGH THE AREA TUESDAY.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
CONTINUE TO MONITOR LATER FORECASTS.

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

In the hours before

Special weather statement, May 7, 7:25 PM CDT, 1 hour 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
725 PM CDT WED MAY 7 2008

OKZ049-053-080100-
CHOCTAW OK-PUSHMATAHA OK-
725 PM CDT WED MAY 7 2008

...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 SOUTHEAST OKLAHOMA
     EASTERN CHOCTAW AND SOUTHERN PUSHMATAHA

AT 725 PM CDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES
NORTH OF FALLON...MOVING NORTHEAST AT 75 MPH. SOME LOCATIONS THAT
WILL BE AFFECTED BY THIS STORM INCLUDE...HUGO...SAWYER...FORT
TOWSON...SWINK...MESSER...SOBOL...FALLON...SPEER...APPLE...CORINNE...
RATTAN AND OLETA.

THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO
50 MPH. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN CASE THE
SIGNIFICANT WEATHER ALERT IS UPGRADED TO A WARNING.

LAT...LON 3414 9558 3442 9504 3425 9503 3423 9505
      3422 9512 3416 9513 3415 9514 3399 9514
      3391 9546
TIME...MOT...LOC 0025Z 243DEG 66KT 3405 9539

Local storm report, May 7, 7:54 PM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
754 PM CDT WED MAY 07 2008

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

0729 PM     TSTM WND DMG     BROKEN ARROW            36.05N 95.79W
05/07/2008                   TULSA              OK   BROADCAST MEDIA

            POWER POLES BROKEN AND TREE DAMAGE NEAR RHEMA BIBLE
            COLLEGE.

&&

SAA

Local storm report, May 7, 8:05 PM CDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
805 PM CDT WED MAY 07 2008

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

0804 PM     TSTM WND GST     PANAMA                  35.17N 94.67W
05/07/2008  E60 MPH          LE FLORE           OK   EMERGENCY MNGR

&&

SAA

Local storm report, May 7, 8:20 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
820 PM CDT WED MAY 07 2008

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

0816 PM     TSTM WND GST     2 W TAHLEQUAH           35.92N 95.01W
05/07/2008  M60 MPH          CHEROKEE           OK   AMATEUR RADIO

&&

SAA

Local storm report, May 7, 8:39 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
839 PM CDT WED MAY 07 2008

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

0834 PM     HAIL             OAKS                    36.17N 94.85W
05/07/2008  E0.75 INCH       CHEROKEE           OK   AMATEUR RADIO

0834 PM     TSTM WND GST     1 N OAKS                36.18N 94.85W
05/07/2008  E60.00 MPH       DELAWARE           OK   AMATEUR RADIO

&&

SAA

Local storm report, May 7, 8:53 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
853 PM CDT WED MAY 07 2008

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

0851 PM     TSTM WND GST     WESTVILLE               35.99N 94.57W
05/07/2008  M60 MPH          ADAIR              OK   AMATEUR RADIO

&&

SAA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 7:01 PM CDT	Tornado Warning	TSA	Muskogee, Okmulgee, Tulsa, Wagoner	59 min
May 7, 7:12 PM CDT	Areal Flood Advisory	TSA	Craig, Creek, Okmulgee, Rogers, Tulsa, Wagoner	37 days
May 7, 7:25 PM CDT	Special Weather Statement	TSA	Pushmataha	35 min
May 7, 7:25 PM CDT	Tornado Warning	TSA	Mayes, Rogers, Tulsa, Wagoner	65 min
May 7, 7:29 PM CDT	Flash Flood Warning	TSA	Nowata, Rogers, Washington	6 hr
May 7, 7:43 PM CDT	Tornado Warning	TSA	Haskell, LeFlore, Sequoyah	47 min
May 7, 7:51 PM CDT	Flash Flood Warning	TSA	Craig, Delaware, Mayes, Ottawa, Rogers	6 hr
May 7, 7:56 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Mayes, Muskogee, Sequoyah and 1 more	64 min
May 7, 8:01 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore, Sequoyah	29 min
May 7, 8:10 PM CDT	Tornado Warning	TSA	Craig, Delaware, Mayes, Rogers	65 min
May 7, 8:28 PM CDT	Tornado Warning	TSA	Sequoyah	32 min
May 7, 8:41 PM CDT	Severe Thunderstorm Warning	TSA	Adair	52 min
May 8, 12:15 AM CDT	River Flood Warning	TSA	Osage	3 hr
May 8, 12:15 AM CDT	River Flood Warning	TSA	Osage, Tulsa	32 hr
May 8, 12:15 AM CDT	River Flood Warning	TSA	Washington	44 hr
May 8, 12:15 AM CDT	River Flood Warning	TSA	Rogers, Tulsa	3 days
May 8, 9:01 AM CDT	River Flood Warning	TSA	Tulsa	35 hr
May 8, 9:01 AM CDT	River Flood Warning	TSA	Muskogee	11 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.