Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 296, NWS Norman, OK

May 8, 2015Canadian County, Grady County, Kingfisher County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 8, 2015, 4:02 PM CDT for Canadian County, Grady County, Kingfisher County, Oklahoma. 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: May 8, 2015, 4:02 PM CDT (21:02 UTC)
Expired: May 8, 2015, 4:45 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Canadian County, OK, Grady County, OK, Kingfisher County, OK

The radar

The Norman radar (KTLX), 63 km from the middle of the area, began a volume at 21:03 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
May 8, 12:51 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.0 hours before the alert went out and 58 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: 171 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 8, 3:36 PM CDT, 26 minutes earlier.

Area forecast discussion, May 8, 3:36 PM CDT, 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
336 PM CDT FRI MAY 8 2015

.DISCUSSION...
THE STORM COMPLEX THAT DEVELOPED THIS AFTERNOON OVER WEST TEXAS
WILL PROGRESS SLOWLY EAST LATE THIS AFTERNOON AND EARLY EVENING.
A SURFACE BOUNDARY EXTENDING ROUGHLY ALONG I-40 SHOULD AT LEAST
SLIGHTLY REDUCE THE SEVERE WEATHER POTENTIAL TO THE NORTH.

LATER TONIGHT...THINGS BECOME MUCH LESS CLEAR. WIDESPREAD ELEVATED
CONVECTION SEEMS LIKELY AS THE LARGE STORM SYSTEM TO OUR WEST
CONTINUES TO PLOD EAST. THIS MAY CAUSE ADVERSE EFFECTS ON THE
FORECAST FOR TOMORROW. IN FACT...MODEL GUIDANCE IS ALL OVER THE
PLACE WITH PRECIPITATION FOR TONIGHT THROUGH TOMORROW NIGHT.
GUIDANCE FINALLY BECOMES COHERENT AGAIN ON SUNDAY...AS THE MAIN
UPPER WAVE DEPARTS...AND A COLD FRONT IS DRIVEN SOUTHEAST INTO
OKLAHOMA.

THE NATURE OF THE FORECAST STORM MOVEMENT AND MOISTURE QUANTITY
WILL BE QUITE FAVORABLE FOR VERY HEAVY RAINFALL OVER MOST OF OUR
FORECAST AREA. A FLOOD WATCH REMAINS IN EFFECT THROUGH SUNDAY
EVENING. SOUTHEAST OKLAHOMA LOOKS LIKE IT WILL BEAR THE MAIN BRUNT
OF HEAVY RAIN...MAINLY LATE IN THE PERIOD...AND THE WATCH MAY NEED
TO BE EXTENDED FOR THAT AREA IN LATER FORECASTS...DEPENDING ON
EXACTLY WHEN THE RAIN FINALLY EXITS OUR FORECAST AREA.

MONDAY LOOKS LIKE A MILD AND DRY DAY...BEFORE RAIN CHANCES RETURN
ON TUESDAY. MODELS AGREE ON A MOIST FLOW NEAR THE SURFACE...WITH
SOUTHWEST FLOW PREVAILING ALOFT. ASSUMING THIS HAPPENS...THERE
WILL BE RELATIVELY HIGH CHANCES FOR RAIN FROM TUESDAY THROUGH AT
LEAST THE FOLLOWING WEEKEND. SINCE THE MAIN TARGET OF THE RAIN
NEXT WEEK WILL PROBABLY BE THE EASTERN HALF OF OKLAHOMA...FLOODING
MAY BECOME A MAJOR CONCERN AGAIN.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  63  77  63  75 /  60  70  50  50
HOBART OK         63  78  57  78 /  50  70  30  20
WICHITA FALLS TX  66  80  63  78 /  50  70  60  60
GAGE OK           59  78  51  74 /  50  70  20  10
PONCA CITY OK     63  77  63  76 /  70  70  60  40
DURANT OK         67  79  66  76 /  70  70  70  80

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLOOD WATCH THROUGH SUNDAY EVENING FOR OKZ006>008-011>013-
     015>048-050>052.

TX...FLOOD WATCH THROUGH SUNDAY EVENING FOR TXZ083>090.

&&

23/23

Hazardous weather outlook, May 8, 12:03 PM CDT, 3 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1203 PM CDT FRI MAY 8 2015

OKZ004>048-050>052-TXZ083>090-091715-
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-
1203 PM CDT FRI MAY 8 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 A MODERATE RISK OF SEVERE STORMS ACROSS PORTIONS OF
SOUTHERN OKLAHOMA AND ALL OF WESTERN NORTH TEXAS TODAY AND
TONIGHT.

LOCATION...
THE MODERATE RISK AREA IS SOUTH AND WEST OF A LINE EXTENDING FROM
GOODLETT TEXAS... TO LAWTON AND PAULS VALLEY... TO DURANT
OKLAHOMA. AN ENHANCED RISK IS GENERALLY ALONG AND SOUTH OF THE
INTERSTATE 40 CORRIDOR.

TIMING...
THROUGH 10 PM

IMPACTS...
HAIL UP TO THE SIZE OF TENNIS BALLS...WIND GUSTS UP TO 80 MPH...
AND A FEW TORNADOES. LOCALLY HEAVY RAINFALL WILL ALSO OCCUR WHICH
MAY RESULT IN FLASH FLOODING.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL IN THE
RISK AREAS SHOULD BE READY FOR SEVERE WEATHER OPERATIONS TODAY
AND TONIGHT.

DISCUSSION...
AN AREA OF SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP AND
AFFECT PORTIONS OF SOUTHWEST OKLAHOMA AND WESTERN NORTH TEXAS
EARLY THIS AFTERNOON. THIS ACTIVITY WILL SPREAD EAST AND NORTHEAST
THE REST OF THIS AFTERNOON AND THIS EVENING. THE MOST LIKELY AREA
FOR THE MOST SIGNIFICANT SEVERE WEATHER WILL BE NEAR AND SOUTH OF
THE RED RIVER. LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN
CONCERNS. A FEW TORNADOES COULD BE POSSIBLE AS WELL... MAINLY IN
THE MODERATE RISK AREA. THE THUNDERSTORMS COULD DEVELOP INTO ONE
OR MORE BOWING LINES LATER THIS AFTERNOON AND EVENING. IF THIS
OCCURS... DAMAGING STRAIGHT-LINE WINDS WILL BECOME A BIGGER
CONCERN THAN THE HAIL. THE POTENTIAL FOR SEVERE STORMS WILL
DIMINISH OVERNIGHT. HOWEVER... THUNDERSTORMS WILL REMAIN POSSIBLE
INTO EARLY SATURDAY.

.HEAVY RAIN...
WITH THE CONTINUED THREAT OF LOCALLY HEAVY RAINFALL...FLASH
FLOODING AND RIVER FLOODING WILL CONTINUE TO BE A CONCERN IN
AREAS WITH PROLONGED RAINFALL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

.THUNDERSTORMS...
A VERY ACTIVE WEATHER PATTERN WILL REMAIN IN PLACE THROUGH
THE WEEKEND...WITH A MODERATE RISK FOR SEVERE STORMS SATURDAY...AND
A SLIGHT RISK SUNDAY. ON SATURDAY...A POTENT STORM SYSTEM COMBINED
WITH ABUNDANT MOISTURE AND INSTABILITY...WILL YIELD A VERY
FAVORABLE ENVIRONMENT FOR SEVERE THUNDERSTORMS. VERY LARGE
HAIL...DAMAGING WINDS...AND TORNADOES WILL ALL BE POSSIBLE...ALONG
WITH THE POTENTIAL FOR A STRONG TORNADO OR TWO. ON SUNDAY...SEVERE
STORMS MAY DEVELOP ALONG A SLOW MOVING FRONT...BRINGING A CONTINUED
THREAT OF LARGE HAIL...DAMAGING WINDS...AND POSSIBLY TORNADOES.

BY MONDAY...A COLD FRONT SHOULD RESULT IN DECREASING STORM CHANCES
FROM WEST TO EAST...BUT A LOW CHANCE OF THUNDERSTORMS WILL REMAIN
ACROSS SOUTHEASTERN OKLAHOMA. THUNDERSTORMS WILL THEN RETURN EACH
DAY FROM TUESDAY INTO NEXT WEEKEND...AS A SERIES OF SYSTEMS MOVES
THROUGH THE SOUTHERN PLAINS. AT THIS TIME...THE POTENTIAL FOR
SEVERE STORMS APPEARS RELATIVELY LOW FROM TUESDAY ONWARD.

.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

Special weather statement, May 8, 3:23 PM CDT, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
323 PM CDT FRI MAY 8 2015

OKZ017-023-024-027-082100-
CANADIAN OK-GRADY OK-CADDO OK-BLAINE OK-
323 PM CDT FRI MAY 8 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CANADIAN...
NORTHWESTERN GRADY...NORTHERN CADDO AND SOUTHWESTERN BLAINE COUNTIES
UNTIL 400 PM CDT...

AT 322 PM CDT...STRONG THUNDERSTORMS NEAR LOOKEBA...BINGER AND
HINTON WERE MOVING NORTHEAST AT 35 MPH.

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

LOCATIONS IMPACTED INCLUDE...
EL RENO...HINTON...GEARY...HYDRO...BINGER...CALUMET...EAKLY...
GRACEMONT...LOOKEBA...BRIDGEPORT...ALBERT...COGAR...FORT COBB
RESERVOIR AND CEDAR LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3554 9783 3514 9822 3523 9863 3574 9863
TIME...MOT...LOC 2022Z 229DEG 30KT 3535 9838

Local storm report, May 8, 3:26 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
326 PM CDT FRI MAY 08 2015

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

0314 PM     HAIL             MANGUM                  34.88N 99.50W
05/08/2015  E1.00 INCH       GREER              OK   PUBLIC

&&

MDAY

Local storm report, May 8, 3:28 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
328 PM CDT FRI MAY 08 2015

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

0320 PM     TSTM WND GST     5 SE MANGUM             34.83N 99.44W
05/08/2015  M68 MPH          GREER              OK   MESONET

&&

MDAY

Local storm report, May 8, 3:32 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
332 PM CDT FRI MAY 08 2015

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

0325 PM     TSTM WND GST     5 SE MANGUM             34.83N 99.44W
05/08/2015  E59 MPH          GREER              OK   MESONET

&&

MDAY

Local storm report, May 8, 3:42 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
342 PM CDT FRI MAY 08 2015

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

0340 PM     HAIL             3 S LONE WOLF           34.95N 99.25W
05/08/2015  E1.00 INCH       KIOWA              OK   AMATEUR RADIO

            ALSO 43 MPH WIND MEASURED.

&&

MDAY

Local storm report, May 8, 4:00 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
400 PM CDT FRI MAY 08 2015

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

0355 PM     TSTM WND GST     4 SE HOBART             34.99N 99.05W
05/08/2015  M64 MPH          KIOWA              OK   MESONET

&&

MDAY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 7:29 PM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Love, Marshall	2 hr
May 7, 7:35 PM CDT	Special Weather Statement	OUN	Love	25 min
May 7, 7:41 PM CDT	Tornado Warning	OUN	Love	34 min
May 7, 8:27 PM CDT	Special Weather Statement	OUN	Bryan	33 min
May 7, 8:34 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Marshall	41 min
May 7, 9:41 PM CDT	Special Weather Statement	OUN	Atoka	34 min
May 7, 9:57 PM CDT	Areal Flood Advisory	OUN	Bryan, Marshall	2 hr
May 7, 11:58 PM CDT	Flash Flood Warning	OUN	Bryan	3 hr
May 8, 2:23 AM CDT	River Flood Warning	OUN	Bryan	28 hr
May 8, 4:36 AM CDT	Dense Fog Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 17 more	5 hr
May 8, 12:30 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	45 min
May 8, 1:10 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	50 min
May 8, 1:55 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Greer, Jackson, Kiowa	50 min
May 8, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	48 min
May 8, 2:26 PM CDT	River Flood Warning	OUN	Jackson, Kiowa, Tillman	54 hr
May 8, 2:26 PM CDT	River Flood Warning	OUN	Comanche, Cotton	3 days
May 8, 2:33 PM CDT	Special Weather Statement	OUN	Caddo, Washita	42 min
May 8, 2:41 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	49 min
May 8, 2:48 PM CDT	Areal Flood Advisory	OUN	Greer, Harmon, Jackson, Kiowa, Washita	3 hr
May 8, 3:21 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	39 min
May 8, 3:23 PM CDT	Special Weather Statement	OUN	Canadian	37 min
May 8, 3:55 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Washita	50 min
May 8, 3:55 PM CDT	Tornado Warning	OUN	Jackson, Tillman	50 min
May 8, 4:16 PM CDT	Flash Flood Warning	OUN	Caddo, Greer, Harmon, Jackson, Kiowa, Washita	3 hr
May 8, 4:27 PM CDT	Flash Flood Warning	OUN	Caddo, Canadian, Cleveland, Grady, Kiowa, McClain and 1 more	6 hr
May 8, 4:28 PM CDT	Tornado Warning Tornado observed	OUN	Tillman	47 min
May 8, 4:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Kiowa, Washita	38 min
May 8, 4:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	50 min
May 8, 4:52 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	38 min
May 8, 4:54 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	51 min
May 8, 5:05 PM CDT	Tornado Warning Tornado observed	OUN	Cotton, Tillman	40 min
May 8, 5:10 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	50 min
May 8, 5:37 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens, Tillman	68 min
May 8, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	48 min
May 8, 6:01 PM CDT	Special Weather Statement	OUN	Cleveland	29 min
May 8, 6:04 PM CDT	Special Weather Statement	OUN	Comanche	26 min
May 8, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Pottawatomie	52 min
May 8, 6:14 PM CDT	Tornado Warning Tornado observed	OUN	Cotton, Jefferson	46 min
May 8, 6:20 PM CDT	Areal Flood Advisory	OUN	Kay, Noble, Payne	3 hr
May 8, 6:29 PM CDT	Special Weather Statement	OUN	Stephens	31 min
May 8, 6:30 PM CDT	Flash Flood Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	4 hr
May 8, 6:39 PM CDT	Areal Flood Advisory	OUN	Canadian, Lincoln, Logan, Noble, Oklahoma, Payne	3 hr
May 8, 6:41 PM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Tillman	64 min
May 8, 6:45 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, Jefferson, Stephens	75 min
May 8, 6:53 PM CDT	Flash Flood Warning	OUN	Comanche, Cotton, Jefferson, Stephens	4 hr
May 8, 6:53 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	52 min
May 8, 6:56 PM CDT	Tornado Warning Tornado observed	OUN	Jefferson	35 min
May 8, 6:59 PM CDT	Tornado Warning	OUN	Lincoln, Pottawatomie, Seminole	31 min
May 8, 2:56 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	49 min
May 8, 3:17 PM CDT	Tornado Warning	OUN	Foard, Hardeman	43 min
May 8, 3:55 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	50 min
May 8, 5:08 PM CDT	Severe Thunderstorm Warning	OUN	Knox	52 min
May 8, 5:18 PM CDT	Tornado Warning	OUN	Knox	42 min
May 8, 6:38 PM CDT	Severe Thunderstorm Warning	OUN	Clay	52 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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; radar from the NEXRAD Level II archive.