Alert archive / Texas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 211, NWS Norman, OK

April 7, 2008Archer County, Baylor County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Apr 7, 2008, 7:02 PM CDT for Archer County, Baylor County, Texas. It was in force for 43 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: Apr 7, 2008, 7:02 PM CDT (00:02 UTC)
Expired: Apr 7, 2008, 7:45 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Archer County, TX, Baylor County, TX

The radar

The Altus AFB radar (KFDR), 83 km from the middle of the area, began a volume at 00:02 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
Apr 7, 3:02 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.0 hours before the alert went out and 228 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: 560 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1836 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 391 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 7.1

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 7, 2:46 PM CDT, 4 hours 16 minutes earlier.

Area forecast discussion, Apr 7, 2:46 PM CDT, 4 hours 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
246 PM CDT MON APR 7 2008

.DISCUSSION...
BUSY EVENING EXPECTED AS SCENARIO SETTING UP FOR SEVERE CONVECTION
TO IMPACT A GOOD PART OF THE AREA. THROUGH THE EVENING HOURS AS LLJ
SETS UP... LOW LEVEL SHEAR IS IMPRESSIVE AND COULD SEE TORNADIC
SUPERCELLS DEVELOP FROM PORTIONS OF SW INTO CENTRAL SECTIONS OF
OKLAHOMA.

SYSTEM WILL TRAVERSE THE AREA OVERNIGHT AS COLD FRONT PUSHES
SOUTH... WITH SEVERE WX LIKELY TO CONT THROUGH THE NIGHT. COULD SEE
SOME STRONG STORMS TUE AFTN ACROSS SE BEFORE COLD FRONT CLEARS THE
AREA. FRONT STALLS TO OUR SOUTH ON WED WITH WAA PRECIP DEVELOPING
OVER WEST TX AND OK AHEAD OF NEXT UPPER WAVE/TROUGH. SFC FRONT SETS
UP SW TO NE ALONG MID LEVEL FLOW. THIS COULD SET THE STAGE FOR
SIGNIFICANT RAIN EVENT ACROSS THE AREA LATE WED INTO THU. ALTHOUGH
SEVERE WX COULD OCCUR... APPEARS THAT HEAVY RAIN/FLOODING COULD POSE
MORE SIGNIFICANT THREAT.

DRIER WX ANTICIPATED FOR NEXT WEEKEND.

ONLY CHANGES TO MOS GUIDANCE WAS TO THIS EVENING SFC DEWPOINTS TO BETTER
REPRESENT SFC BOUNDARY ACROSS THE AREA.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  56  64  46  62 /  50  30  30  60
HOBART OK         53  63  43  59 /  20  20  20  80
WICHITA FALLS TX  60  74  51  68 /  10  20  40  60
GAGE OK           39  65  39  62 /  40  10  10  70
PONCA CITY OK     49  60  41  62 /  80  40  10  40
DURANT OK         62  74  57  73 /  20  40  60  40

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

11/30

Hazardous weather outlook, Apr 7, 3:20 PM CDT, 3 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
320 PM CDT MON APR 7 2008

OKZ004>048-050>052-TXZ083>090-081200-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
320 PM CDT MON APR 7 2008

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF WESTERN NORTH TEXAS AND SOUTHWEST THROUGH CENTRAL
OKLAHOMA. A SLIGHT RISK AREA COVERS THE REST OF THE REGION.

LOCATION...
THE MODERATE RISK AREA COVERS LOCATIONS TO THE RIGHT OF A LINE
EXTENDING FROM ADA...TO ARDMORE...TO ARCHER CITY AND SEYMOUR
TEXAS...TO ALTUS AND ELK CITY...EASTWARD TO PERRY. THIS INCLUDES THE
CITIES OF ADA...ARDMORE...LAWTON...WICHITA FALLS...SEYMOUR...
VERNON...ALTUS...CLINTON...WEATHERFORD...OKLAHOMA CITY...AND
STILLWATER.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE NOW THROUGH
THE OVERNIGHT HOURS. THE GREATEST LIKELIHOOD FOR TORNADIC
THUNDERSTORMS WILL OCCUR FROM 5 PM THROUGH MIDNIGHT.

IMPACTS...
HAIL UP TO THE SIZE OF SOFTBALLS...WINDS TO 80 MPH...AND TORNADOES
WILL BE POSSIBLE...PRIMARILY IN THE MODERATE RISK AREA. IN THE
SLIGHT RISK AREA...HAIL TO THE SIZE OF HALF DOLLARS WILL BE THE MAIN
CONCERN.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREAS SHOULD PLAN FOR SEVERE WEATHER OPERATIONS.

DISCUSSION...
GULF MOISTURE WILL CONTINUE TO INCREASE ACROSS THE REGION THROUGH
THE LATE AFTERNOON AS AN AREA OF LOW PRESSURE DEEPENS ACROSS THE
TEXAS PANHANDLE. MODERATE TO HIGH LEVELS OF INSTABILITY HAVE
DEVELOPED AHEAD OF A DRY LINE OVER FAR WESTERN OKLAHOMA AND WESTERN
NORTH TEXAS...AND SOUTH OF A WARM FRONT ACROSS THE INTERSTATE-40
CORRIDOR.

DEEP LAYER WIND SHEAR WILL BE MORE THAN SUFFICIENT TO SUPPORT
SUPERCELL THUNDERSTORMS... AND LOW-LEVEL WIND SHEAR WILL BE ADEQUATE
FOR TORNADIC SUPERCELLS. AS THUNDERSTORMS DEVELOP IN THE UNSTABLE
AIRMASS...VERY LARGE AND DAMAGING HAIL...TO THE SIZE OF
SOFTBALLS...AND DAMAGING WINDS IN EXCESS OF 75 MPH...WILL BE
POSSIBLE WITH ANY SUPERCELLS. TORNADOES WILL BE POSSIBLE WITH THE
STRONGEST STORMS IN THE MODERATE RISK AREA...ESPECIALLY THIS EVENING
WHEN A LOW-LEVEL JET DEVELOPS.

MORE WIDESPREAD SHOWERS AND THUNDERSTORMS MAY FORM LATE TONIGHT
NORTH OF THE WARM FRONT ACROSS NORTHERN OKLAHOMA. SOME SEVERE
WEATHER IS POSSIBLE...WITH THE PRIMARY CONCERN BEING LARGE HAIL.

A COLD FRONT WILL MOVE SOUTHWARD ACROSS THE NORTHWEST HALF OF
OKLAHOMA...AND MOST OF WESTERN NORTH TEXAS...OVERNIGHT. THE RISK FOR
SEVERE THUNDERSTORMS WILL END AS THE COLD FRONT MOVES INTO EASTERN
OKLAHOMA TUESDAY MORNING.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY APR 8.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
ELEVATED FIRE WEATHER CONDITIONS WILL BE SEEN OVER A SMALL PART OF
WESTERN NORTH TEXAS...AND SOUTHWEST OKLAHOMA LATE THROUGH EARLY
EVENING AS A DRY LINE APPROACHES FROM WEST TEXAS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
LATER IN THE WEEK...THERE ARE INDICATIONS THAT MORE WIDESPREAD
SHOWERS AND THUNDERSTORMS MAY DEVELOP WEDNESDAY AND THURSDAY. THERE
WILL BE THE POTENTIAL OF HEAVY RAIN RESULTING IN LOCALIZED FLOODING.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
TUESDAY.

11

In the hours before

Local storm report, Apr 7, 6:10 PM CDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
610 PM CDT MON APR 07 2008

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

0605 PM     HAIL             6 NNW DEAN              34.03N 98.39W
04/07/2008  E0.75 INCH       CLAY               TX   AMATEUR RADIO

&&

TAYLOR

Local storm report, Apr 7, 6:15 PM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
615 PM CDT MON APR 07 2008

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

0612 PM     HAIL             5 WSW CHARLIE           34.07N 98.40W
04/07/2008  E0.88 INCH       CLAY               TX   AMATEUR RADIO

&&

TAYLOR

Local storm report, Apr 7, 6:25 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
625 PM CDT MON APR 07 2008

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

0456 PM     TORNADO          2 WNW ELECTRA           34.04N 98.95W
04/07/2008                   WICHITA            TX   TRAINED SPOTTER

            BRIEF TOUCHDOWN NEAR US 287 AND COUNTY LINE ROAD. NO
            DAMAGE REPORTED. LOCATION AND TIME ESTIMATED.

&&

TAYLOR

Special weather statement, Apr 7, 6:29 PM CDT, 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
629 PM CDT MON APR 7 2008

TXZ088-072345-
BAYLOR TX-
629 PM CDT MON APR 7 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BAYLOR COUNTY.

A STRONG THUNDERSTORM WAS LOCATED 3 MILES SOUTH OF LAKE KEMP AT 629
PM CDT...MOVING NORTHEAST AT 25 MPH. THIS STORM IS STRENGTHENING AND
IS CURRENTLY CAPABLE OF PEA TO DIME SIZE HAIL AND 50 MPH WINDS.

PEOPLE IN BAYLOR COUNTY SHOULD MONITOR THE WEATHER SITUATION CLOSELY.
LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER
CONDITIONS.

JAMES

Special weather statement, Apr 7, 6:49 PM CDT, 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
649 PM CDT MON APR 7 2008

OKZ019-020-080015-
LOGAN OK-PAYNE OK-
649 PM CDT MON APR 7 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR LOGAN AND PAYNE COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED OVER LANGSTON AT 649 PM CDT...
MOVING NORTHEAST AT 25 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE.

PEOPLE IN LOGAN AND PAYNE COUNTIES SHOULD MONITOR THE WEATHER
SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR
THREATENING WEATHER CONDITIONS.

30

Special weather statement, Apr 7, 6:57 PM CDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
657 PM CDT MON APR 7 2008

TXZ088-089-080015-
ARCHER TX-BAYLOR TX-
657 PM CDT MON APR 7 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ARCHER AND BAYLOR COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED 4 MILES NORTH OF WESTOVER AT 657 PM
CDT...MOVING NORTHEAST AT 25 MPH. SMALL HAIL AND 50 MPH WINDS ARE
LIKELY. FURTHER STRENGTHENING IS POSSIBLE.

PEOPLE IN ARCHER AND BAYLOR COUNTIES SHOULD MONITOR THE WEATHER
SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR
THREATENING WEATHER CONDITIONS.

JAMES

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Payne	45 min
Apr 7, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	44 min
Apr 7, 7:35 PM CDT	Severe Thunderstorm Warning	OUN	Payne	40 min
Apr 7, 7:47 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	43 min
Apr 7, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	49 min
Apr 7, 7:57 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	33 min
Apr 7, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Payne	20 min
Apr 7, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	46 min
Apr 7, 8:18 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	42 min
Apr 7, 8:46 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, Stephens	25 min
Apr 7, 10:01 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	44 min
Apr 7, 10:27 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma	29 min
Apr 7, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	24 min
Apr 7, 10:58 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Logan, Oklahoma	47 min
Apr 7, 11:13 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	40 min
Apr 7, 11:39 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	51 min
Apr 7, 11:44 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma	46 min
Apr 8, 12:24 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	51 min
Apr 8, 12:27 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	48 min
Apr 8, 12:30 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	30 min
Apr 8, 12:58 AM CDT	Severe Thunderstorm Warning	OUN	Payne	32 min
Apr 8, 1:04 AM CDT	Severe Thunderstorm Warning	OUN	Woods	11 min
Apr 8, 1:14 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	16 min
Apr 8, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	33 min
Apr 8, 1:55 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	35 min
Apr 8, 1:57 AM CDT	Severe Thunderstorm Warning	OUN	Payne	18 min
Apr 8, 1:59 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	46 min
Apr 8, 2:29 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	16 min
Apr 8, 2:44 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	46 min
Apr 8, 3:31 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	44 min
Apr 7, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	50 min
Apr 7, 7:46 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	44 min
Apr 7, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	62 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.