Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 277, NWS Norman, OK

May 7, 2015Baylor County, Texas

NWS Norman, OK issued this severe thunderstorm warning at May 7, 2015, 2:31 PM CDT for Baylor County, Texas. It was in force for 44 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 7, 2015, 2:31 PM CDT (19:31 UTC)
Expired: May 7, 2015, 3:15 PM CDT
In force: 44 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Baylor County, TX

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, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.5 hours before the alert went out and 199 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: 656 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.2

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 May 7, 12:33 PM CDT, 1 hour 58 minutes earlier.

Area forecast discussion, May 7, 12:33 PM CDT, 1 hour 58 minutes before

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Hazardous weather outlook, May 7, 11:54 AM CDT, 2 hours 37 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1154 AM CDT THU MAY 7 2015

OKZ004>048-050>052-TXZ083>090-081700-
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-
1154 AM CDT THU MAY 7 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

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

.THUNDERSTORMS...
THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF CENTRAL AND SOUTHERN OKLAHOMA... AND WESTERN NORTH TEXAS.

LOCATION...
THE ENHANCED RISK AREA IS GENERALLY ALONG AND SOUTH OF A LINE FROM
ELK CITY... TO CLINTON AND OKLAHOMA CITY... TO SEMINOLE OKLAHOMA.
THIS INCLUDES ALL OF WESTERN NORTH TEXAS. A SLIGHT RISK IS FOR
AREAS NORTH OF THIS LINE.

TIMING...
THROUGH MIDNIGHT BUT MOST WIDESPREAD AND SIGNIFICANT SEVERE STORMS
ARE EXPECTED 2 PM TO MIDNIGHT.

IMPACTS...
HAIL UP TO THE SIZE OF TENNIS BALLS... WIND GUSTS UP TO 75 MPH...
AND A FEW TORNADOES. LOCALLY HEAVY RAINFALL WILL ALSO OCCUR WITH
THE STRONGER STORMS WHICH MAY RESULT IN FLASH FLOODING.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL IN THE
SLIGHT RISK AREA SHOULD BE READY FOR SEVERE WEATHER OPERATIONS.

DISCUSSION...
THUNDERSTORMS THAT DEVELOPED IN THE TEXAS PANHANDLE AND WEST
TEXAS THIS MORNING WILL CONTINUE TO MOVE EAST AND SPREAD ACROSS AT
LEAST PARTS OF CENTRAL AND SOUTHERN OKLAHOMA... AND WESTERN NORTH
TEXAS. OTHER THUNDERSTORMS COULD DEVELOP FURTHER NORTH LATE THIS
AFTERNOON.

INSTABILITY AND WIND SHEAR WILL BE SUFFICIENT FOR STRONG TO SEVERE
STORMS THIS AFTERNOON AND TONIGHT. LARGE HAIL... DAMAGING WIND
GUSTS... AND A FEW TORNADOES WILL BE POSSIBLE. THE POTENTIAL FOR
SEVERE STORMS WILL DECREASE OVERNIGHT BUT THUNDERSTORMS COULD
CONTINUE INTO EARLY FRIDAY.

.HEAVY RAIN...
FLASH FLOODING WILL BE POSSIBLE IN SOME LOCATIONS THIS AFTERNOON
AND TONIGHT WITH ANY ADDITIONAL HEAVY RAIN. MAINSTEM RIVER
FLOODING WILL ALSO CONTINUE IN SOME AREAS THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

.THUNDERSTORMS...
A VERY ACTIVE WEATHER PATTERN WILL REMAIN IN PLACE THROUGH
THE WEEKEND. SEVERE STORMS WILL BE POSSIBLE EACH DAY...ESPECIALLY
DURING THE MID AFTERNOON INTO THE LATE EVENING. AT THIS
TIME...SATURDAY MAY HAVE THE GREATEST POTENTIAL FOR SEVERE WEATHER
AS A STRONG STORM SYSTEM APPROACHES THE SOUTHERN PLAINS. TORNADOES
WILL BE POSSIBLE WITH STORMS FRIDAY AND SATURDAY.

.HEAVY RAIN...
ADDITIONAL HEAVY RAIN WILL BE POSSIBLE ACROSS THE AREA THROUGH
THE WEEKEND. THIS COULD LEAD TO ADDITIONAL FLASH FLOODING AND
MAINSTEM RIVER FLOODING. A FLOOD WATCH IS IN EFFECT THROUGH SUNDAY
EVENING.

GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.

In the hours before

Local storm report, May 7, 11:12 AM CDT, 3 hours 19 minutes before

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Local storm report, May 7, 11:39 AM CDT, 2 hours 52 minutes before

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Special weather statement, May 7, 12:08 PM CDT, 2 hours 23 minutes before

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Special weather statement, May 7, 1:31 PM CDT, 1 hour before

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Special weather statement, May 7, 1:34 PM CDT, 57 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
134 PM CDT THU MAY 7 2015

OKZ033>036-TXZ083-071900-
HARMON OK-GREER OK-KIOWA OK-JACKSON OK-HARDEMAN TX-
134 PM CDT THU MAY 7 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HARMON...EASTERN
GREER...NORTHWESTERN KIOWA...JACKSON AND CENTRAL HARDEMAN COUNTIES
UNTIL 200 PM CDT...

AT 132 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
3 MILES EAST OF LONE WOLF TO NEAR BLAIR TO 6 MILES NORTH OF QUANAH...
MOVING NORTHEAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 40 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3486 9951 3511 9937 3511 9882 3438 9946
      3440 9947 3435 9947 3419 9961 3435 9999
TIME...MOT...LOC 1832Z 216DEG 26KT 3498 9918 3481 9933 3438 9971

Special weather statement, May 7, 2:17 PM CDT, 14 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	45 min
May 6, 7:00 PM CDT	Tornado Warning	OUN	Major	30 min
May 6, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	43 min
May 6, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	51 min
May 6, 7:24 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	51 min
May 6, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Dewey, Major, Woods	50 min
May 6, 7:25 PM CDT	Tornado Warning	OUN	Grady	35 min
May 6, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	48 min
May 6, 7:27 PM CDT	Tornado Warning	OUN	Grant	33 min
May 6, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	31 min
May 6, 7:35 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens, Tillman	40 min
May 6, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	45 min
May 6, 7:57 PM CDT	Tornado Warning	OUN	Oklahoma	33 min
May 6, 7:59 PM CDT	Tornado Warning	OUN	Canadian, Grady	46 min
May 6, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	41 min
May 6, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	46 min
May 6, 8:16 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	44 min
May 6, 8:25 PM CDT	Tornado Warning	OUN	Cleveland, Oklahoma	35 min
May 6, 8:28 PM CDT	Tornado Warning	OUN	Grady, McClain	32 min
May 6, 8:34 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	41 min
May 6, 8:36 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	39 min
May 6, 8:51 PM CDT	River Flood Warning	OUN	Oklahoma	27 hr
May 6, 8:51 PM CDT	River Flood Warning	OUN	Lincoln, Oklahoma, Pottawatomie	42 hr
May 6, 8:55 PM CDT	River Flood Warning	OUN	Cleveland, McClain, Pottawatomie	37 hr
May 6, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Woods	49 min
May 6, 9:12 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	48 min
May 6, 9:19 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Jackson, Kiowa, Tillman, Washita	41 min
May 6, 9:28 PM CDT	Tornado Warning	OUN	Cleveland, Oklahoma	32 min
May 6, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	46 min
May 6, 9:48 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	42 min
May 6, 9:56 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	49 min
May 6, 10:24 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	51 min
May 6, 10:28 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant, Woods	47 min
May 6, 10:37 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	38 min
May 6, 10:55 PM CDT	Special Weather Statement	OUN	Carter, Jefferson, Love	35 min
May 6, 11:00 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	45 min
May 6, 11:09 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Custer	26 min
May 6, 11:14 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	46 min
May 6, 11:16 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	31 min
May 6, 11:20 PM CDT	Tornado Warning	OUN	Seminole	25 min
May 6, 11:43 PM CDT	Areal Flood Advisory	OUN	Hughes, Pottawatomie, Seminole	3 hr
May 6, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	48 min
May 7, 12:19 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Stephens, Tillman	41 min
May 7, 12:21 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	24 min
May 7, 12:52 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	38 min
May 7, 1:09 AM CDT	Special Weather Statement	OUN	Jackson	36 min
May 7, 1:11 AM CDT	Special Weather Statement	OUN	Comanche, Stephens	34 min
May 7, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	49 min
May 7, 1:33 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	42 min
May 7, 1:56 AM CDT	Special Weather Statement	OUN	Love, Marshall	34 min
May 7, 2:14 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	46 min
May 7, 2:42 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	48 min
May 7, 3:11 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal	49 min
May 7, 4:24 AM CDT	Special Weather Statement	OUN	Comanche	21 min
May 7, 4:30 AM CDT	Special Weather Statement	OUN	Comanche	30 min
May 7, 4:48 AM CDT	Special Weather Statement	OUN	Canadian	27 min
May 7, 4:54 AM CDT	Special Weather Statement	OUN	Cotton	36 min
May 7, 5:06 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	39 min
May 7, 5:24 AM CDT	River Flood Warning	OUN	Comanche, Cotton	29 hr
May 7, 5:24 AM CDT	River Flood Warning	OUN	Cotton	5 days
May 7, 5:44 AM CDT	Special Weather Statement	OUN	Stephens	31 min
May 7, 6:17 AM CDT	Special Weather Statement	OUN	Stephens	28 min
May 7, 6:52 AM CDT	Special Weather Statement	OUN	Carter	38 min
May 7, 7:37 AM CDT	Special Weather Statement	OUN	Carter, Murray	23 min
May 7, 9:38 AM CDT	River Flood Warning	OUN	Atoka, Bryan	8 days
May 7, 10:58 AM CDT	Special Weather Statement	OUN	Beckham	32 min
May 7, 11:00 AM CDT	Special Weather Statement	OUN	Harmon	30 min
May 7, 11:30 AM CDT	Severe Thunderstorm Warning	OUN	Harmon	30 min
May 7, 11:36 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	21 min
May 7, 11:54 AM CDT	Flood Watch	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 37 more	3 days
May 7, 12:08 PM CDT	Special Weather Statement	OUN	Harmon	37 min
May 7, 12:18 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	42 min
May 7, 12:56 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	31 min
May 7, 1:05 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	3 hr
May 7, 1:31 PM CDT	Special Weather Statement	OUN	Caddo	29 min
May 7, 1:34 PM CDT	Special Weather Statement	OUN	Jackson	26 min
May 7, 1:48 PM CDT	Areal Flood Advisory	OUN	Greer, Jackson, Kiowa	3 hr
May 7, 2:09 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	40 min
May 7, 2:42 PM CDT	Areal Flood Advisory	OUN	Kiowa, Washita	3 hr
May 7, 3:35 PM CDT	Special Weather Statement	OUN	Caddo	25 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning in 2015

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.