Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 285, NWS Norman, OK

May 18, 20135 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2013, 9:05 PM CDT for 5 counties in Oklahoma. It was in force for 40 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 18, 2013, 9:05 PM CDT (02:05 UTC)
Expired: May 18, 2013, 9:45 PM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Canadian County, OK, Cleveland County, OK, Grady County, OK, McClain County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 31 km from the middle of the area, began a volume at 02:06 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 18, 3:17 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.1 hours before the alert went out and 20 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: 3824 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1277 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.8

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 18, 2:25 PM CDT, 6 hours 40 minutes earlier.

Area forecast discussion, May 18, 2:25 PM CDT, 6 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
225 PM CDT SAT MAY 18 2013

.DISCUSSION...
STAGE STILL APPEARS TO BE SETTING UP FOR A VERY BUSY FEW DAYS
WRT SEVERE WEATHER ACROSS OKLAHOMA AND WESTERN NORTH TEXAS. LARGE
SCALE WESTERN TROUGH WILL BRING SEVERAL SHORTWAVES INTO THE
SOUTHERN PLAINS THROUGH TUESDAY BEFORE MAIN TROUGH MOVES THROUGH.

FOR TODAY... CAPPING INVERSION HAS HELD THINGS IN CHECK... BUT
MIDDAY SOUNDING ACROSS THE AREA SHOW ONLY MINIMAL CAP STILL
REMAINING. EXPECT STORMS TO DEVELOP ACROSS WESTERN OKLAHOMA INTO
WESTERN NORTH TEXAS AND WITH EXTREME INSTABILITY AND STRENGTHENING
WIND FIELDS... SEVERE STORMS ARE LIKELY.

ANOTHER ROUND OF SEVERE WEATHER IS ANTICIPATED ON SUNDAY WITH THE
MAIN SFC BOUNDARIES RESIDING FARTHER EAST AND SOUTHEAST IN THE
MAIN BODY OF THE STATE WITH AFTN STORMS DEVELOPING IN WESTERN
OKLAHOMA AND MORE LIKELY AFFECTING CENTRAL SECTIONS OF
OKLAHOMA. AGAIN INSTABILITY AND WIND FIELDS WILL BE VERY
FAVORABLE FOR HIGH END SEVERE STORMS.

THE LATEST MODEL RUNS HAVE SLOWED THE EASTWARD PROGRESSION OF SFC
BOUNDARIES DOWN AND KEEP MUCH OF CENTRAL INTO EASTERN OKLAHOMA IN
THE RISK ON MONDAY AND PERHAPS EVEN INTO TUESDAY ACROSS SOUTHEAST
OKLAHOMA. THE PARTICULARS WILL BECOME INCREASINGLY DEPENDENT ON
WHAT HAPPENS THE DAY/NIGHT BEFORE.

OTHERWISE VERY WARM/HOT AND MUGGY CONDITIONS WILL CONTINUE THE
NEXT SEVERAL DAYS BEFORE THE SFC FRONT WORKS THROUGH THE AREA WITH
SOME COOLER AND DRIER AIR WORKING INTO OKLAHOMA AND NORTH TEXAS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  69  90  66  87 /  30  30  50  50
HOBART OK         69  95  63  94 /  30  20  10  20
WICHITA FALLS TX  71  98  67  97 /  30  20  20  20
GAGE OK           61  88  56  84 /  30  20  20  20
PONCA CITY OK     70  89  64  84 /  30  50  60  50
DURANT OK         69  88  71  88 /  20  20  30  30

&&

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

26/30

Hazardous weather outlook, May 18, 12:19 PM CDT, 8 hours 46 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1219 PM CDT SAT MAY 18 2013

OKZ004>048-050>052-TXZ083>090-191000-
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-
1219 PM CDT SAT MAY 18 2013

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 OKLAHOMA...AND A SLIGHT RISK THAT INCLUDES
WESTERN NORTH TEXAS.

LOCATION...
THE MODERATE RISK AREA IS ACROSS NORTHWESTERN OKLAHOMA...WEST AND
NORTH OF A LINE FROM NEAR CHEROKEE...TO WATONGA...TO WEATHERFORD...
TO ELK CITY. THE SLIGHT RISK AREA INCLUDES MUCH OF WESTERN AND
CENTRAL OKLAHOMA AND WESTERN NORTH TEXAS...GENERALLY WEST OF A LINE
FROM CHANDLER... TO SULPHUR...TO MARIETTA INCLUDING ALL OF WESTERN
NORTH TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 4 PM
THIS AFTERNOON THROUGH MIDNIGHT.

IMPACTS...
LARGE DAMAGING HAIL LARGER THAN BASEBALLS MAY CREATE DAMAGE TO CROPS..
ROOFS AND CARS. DAMAGING WINDS MAY DOWN TREES AND POWER LINES AND DAMAGE
STRUCTURES. ISOLATED TORNADOES ARE ALSO POSSIBLE.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THIS AFTERNOON
AND EVENING.

DISCUSSION...
A DRYLINE WILL LIE ALONG THE BORDER BETWEEN THE TEXAS PANHANDLE AND
OKLAHOMA THIS AFTERNOON. CONVERGENCE ALONG THE DRYLINE...PLUS LIFT
ASSOCIATED WITH AN UPPER-LEVEL WAVE...WILL HELP GENERATE SCATTERED
THUNDERSTORMS BY LATE THIS AFTERNOON. STRONG INSTABILITY AND MODERATE
TO STRONG WIND SHEAR WILL PROVIDE AN ENVIRONMENT THAT IS VERY FAVORABLE
FOR SEVERE THUNDERSTORMS. IN THE MODERATE RISK AREA...CONDITIONS WILL
SUPPORT A HIGHER PROBABILITY OF SEVERE STORMS AND TORNADOES THIS AFTERNOON
AND EVENING. THUNDERSTORMS WILL LIKELY BECOME LESS NUMEROUS AFTER MIDNIGHT
REDUCING THE SEVERE WEATHER RISK.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY MAY 19.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...80 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORM OUTLOOK...
AN ELEVATED RISK OF SEVERE STORMS WILL OCCUR AGAIN ON SUNDAY AND MONDAY...
AND POSSIBLY INTO TUESDAY. A CHANCE OF STORMS WILL CONTINUE THROUGH
FRIDAY...BUT THE RISK OF SEVERE STORMS WILL BE LOW AFTER TUESDAY.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
SUNDAY.

CMS/30/26

In the hours before

Local storm report, May 18, 8:49 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
849 PM CDT SAT MAY 18 2013

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

0822 PM     TSTM WND GST     VANCE AIR FORCE BASE    36.34N 97.90W
05/18/2013  M64 MPH          GARFIELD           OK   AWOS

0840 PM     TSTM WND GST     1 WSW LAHOMA            36.38N 98.11W
05/18/2013  M67 MPH          MAJOR              OK   MESONET

&&

JPIKE

Local storm report, May 18, 8:50 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
850 PM CDT SAT MAY 18 2013

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

0847 PM     HAIL             ALTUS                   34.64N 99.33W
05/18/2013  E1.75 INCH       JACKSON            OK   AMATEUR RADIO

&&

JPIKE

Local storm report, May 18, 8:52 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
852 PM CDT SAT MAY 18 2013

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

0851 PM     HAIL             ALTUS                   34.64N 99.33W
05/18/2013  E1.75 INCH       JACKSON            OK   AMATEUR RADIO

            PARK LANE AND HERITAGE AREAS

&&

JPIKE

Local storm report, May 18, 8:57 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
857 PM CDT SAT MAY 18 2013

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

0847 PM     HAIL             N ALTUS                 34.64N 99.33W
05/18/2013  E1.75 INCH       JACKSON            OK   PUBLIC

0850 PM     TSTM WND GST     3 SE BRECKENRIDGE       36.41N 97.69W
05/18/2013  M63 MPH          GARFIELD           OK   MESONET

&&

JPIKE

Local storm report, May 18, 9:02 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
902 PM CDT SAT MAY 18 2013

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

0856 PM     HAIL             ODELL                   34.35N 99.42W
05/18/2013  E1.50 INCH       WILBARGER          TX   EMERGENCY MNGR

0850 PM     TSTM WND GST     4 SE ENID               36.36N 97.83W
05/18/2013  M62 MPH          GARFIELD           OK   AWOS

            WOODRING AIRPORT

0900 PM     HAIL             VANCE AIR FORCE BASE    36.34N 97.90W
05/18/2013  M2.00 INCH       GARFIELD           OK   TRAINED SPOTTER

            1.9 INCH MEASURED

&&

JPIKE

Local storm report, May 18, 9:04 PM CDT, 1 minute 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 18, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	45 min
May 18, 7:26 PM CDT	Areal Flood Advisory	OUN	Jackson, Kiowa, Washita	3 hr
May 18, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Greer, Kiowa, Washita	46 min
May 18, 7:53 PM CDT	Special Weather Statement	OUN	Canadian	37 min
May 18, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	49 min
May 18, 8:02 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	43 min
May 18, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa, Washita	48 min
May 18, 8:15 PM CDT	Special Weather Statement	OUN	Custer	15 min
May 18, 8:22 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	38 min
May 18, 8:31 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	29 min
May 18, 8:39 PM CDT	Special Weather Statement	OUN	Alfalfa, Dewey, Garfield, Grant, Major, Woods and 1 more	51 min
May 18, 8:43 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	47 min
May 18, 8:49 PM CDT	High Wind Warning	OUN	Alfalfa, Dewey, Garfield, Grant, Kay, Major and 2 more	3 hr
May 18, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Jackson, Kiowa, Tillman	34 min
May 18, 9:02 PM CDT	Flash Flood Warning	OUN	Kiowa	3 hr
May 18, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Jackson, Kiowa, Tillman and 1 more	44 min
May 18, 11:04 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, Stephens	41 min
May 18, 11:08 PM CDT	Special Weather Statement	OUN	Lincoln, Pottawatomie, Seminole	37 min
May 18, 11:15 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pottawatomie, Seminole	45 min
May 18, 11:35 PM CDT	Special Weather Statement	OUN	Major	25 min
May 18, 11:43 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	47 min
May 19, 12:07 AM CDT	Special Weather Statement	OUN	Hughes, Seminole	23 min
May 19, 12:29 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woodward	46 min
May 19, 12:33 AM CDT	Special Weather Statement	OUN	Blaine	27 min
May 19, 1:11 AM CDT	Special Weather Statement	OUN	Garfield, Major	64 min
May 19, 2:12 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	33 min
May 19, 4:20 AM CDT	Red Flag Warning	OUN	Harmon, Jackson, Tillman	17 hr
May 19, 2:31 PM CDT	Special Weather Statement	OUN	Woods	29 min
May 19, 2:48 PM CDT	Special Weather Statement	OUN	Canadian	27 min
May 19, 3:00 PM CDT	Special Weather Statement	OUN	Woods	30 min
May 19, 3:17 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	43 min
May 19, 3:19 PM CDT	Special Weather Statement	OUN	Canadian	26 min
May 19, 3:21 PM CDT	Special Weather Statement	OUN	Harper	24 min
May 19, 3:25 PM CDT	Severe Thunderstorm Warning	OUN	Grant	35 min
May 19, 3:31 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	44 min
May 19, 3:40 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	50 min
May 19, 3:42 PM CDT	Tornado Warning	OUN	Canadian, Logan, Oklahoma	33 min
May 19, 3:54 PM CDT	Special Weather Statement	OUN	Grady	36 min
May 19, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	45 min
May 19, 4:07 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	53 min
May 19, 4:11 PM CDT	Tornado Warning	OUN	Oklahoma	34 min
May 19, 4:16 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	44 min
May 19, 4:33 PM CDT	Severe Thunderstorm Warning	OUN	Logan	27 min
May 19, 4:36 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	39 min
May 19, 4:43 PM CDT	Tornado Warning	OUN	Lincoln, Oklahoma	32 min
May 19, 4:50 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	40 min
May 19, 4:51 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	39 min
May 19, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	63 min
May 19, 4:58 PM CDT	Tornado Warning	OUN	Lincoln	32 min
May 19, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	48 min
May 19, 5:21 PM CDT	Tornado Warning	OUN	Cleveland, McClain	24 min
May 19, 5:30 PM CDT	Tornado Warning	OUN	Lincoln, Payne	30 min
May 19, 5:40 PM CDT	Tornado Warning	OUN	Cleveland, McClain	35 min
May 19, 6:00 PM CDT	Severe Thunderstorm Warning	OUN	Kay	45 min
May 19, 6:01 PM CDT	Tornado Warning	OUN	Cleveland, Pottawatomie	44 min
May 19, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	42 min
May 19, 6:08 PM CDT	Tornado Warning	OUN	Lincoln	37 min
May 19, 6:17 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	43 min
May 19, 6:29 PM CDT	Tornado Warning	OUN	Pottawatomie	46 min
May 19, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	18 min
May 19, 6:45 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie	45 min
May 19, 6:59 PM CDT	Tornado Warning	OUN	Lincoln, Pottawatomie	31 min
May 18, 7:51 PM CDT	Special Weather Statement	OUN	Foard, Hardeman	24 min
May 18, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	49 min
May 18, 8:01 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	44 min
May 18, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	45 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013 Every severe thunderstorm warning in 2013

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.