Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 286, NWS Norman, OK

May 18, 20137 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2013, 9:31 PM CDT for 7 counties in Oklahoma. 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 18, 2013, 9:31 PM CDT (02:31 UTC)
Expired: May 18, 2013, 10:15 PM CDT
In force: 44 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Caddo County, OK, Comanche County, OK, Grady County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 60 km from the middle of the area, began a volume at 02:32 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, 2.5 hours before the alert went out and 127 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, 7 hours 6 minutes earlier.

Area forecast discussion, May 18, 2:25 PM CDT, 7 hours 6 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, 9:10 PM CDT, 21 minutes before

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In the hours before

Local storm report, May 18, 9:07 PM CDT, 24 minutes before

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Local storm report, May 18, 9:09 PM CDT, 22 minutes before

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Local storm report, May 18, 9:12 PM CDT, 19 minutes before

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Local storm report, May 18, 9:16 PM CDT, 15 minutes before

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Local storm report, May 18, 9:20 PM CDT, 11 minutes before

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Local storm report, May 18, 9:31 PM CDT, 0 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 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, 9:05 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	40 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.