Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 490, NWS Norman, OK

May 28, 2015Greer County, Harmon County, Jackson County, Oklahoma; Foard County, Hardeman County, Wilbarger County, Texas

NWS Norman, OK issued this severe thunderstorm warning at May 28, 2015, 1:53 AM CDT for Greer County, Harmon County, Jackson County, Oklahoma; Foard County, Hardeman County, Wilbarger County, Texas. It was in force for 36 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 28, 2015, 1:53 AM CDT (06:53 UTC)
Expired: May 28, 2015, 2:29 AM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 70.0 mph

Counties Greer County, OK, Harmon County, OK, Jackson County, OK, Foard County, TX, Hardeman County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 58 km from the middle of the area, began a volume at 06:54 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.9 hours before the alert went out and 219 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: 477 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1424 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 27, 11:24 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, May 27, 11:24 PM CDT, 2 hours 29 minutes before

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Hazardous weather outlook, May 27, 11:45 PM CDT, 2 hours 8 minutes before

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In the hours before

Special weather statement, May 28, 12:48 AM CDT, 1 hour 5 minutes before

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Special weather statement, May 28, 1:01 AM CDT, 52 minutes before

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Special weather statement, May 28, 1:10 AM CDT, 43 minutes before

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Special weather statement, May 28, 1:14 AM CDT, 39 minutes before

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Special weather statement, May 28, 1:38 AM CDT, 15 minutes before

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Special weather statement, May 28, 1:49 AM CDT, 4 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 27, 8:21 PM CDT	Special Weather Statement	OUN	Roger Mills	39 min
May 27, 8:31 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills	44 min
May 27, 8:57 PM CDT	Tornado Warning	OUN	Ellis, Roger Mills	33 min
May 27, 9:30 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Roger Mills	45 min
May 27, 9:58 PM CDT	Areal Flood Advisory	OUN	Custer, Dewey, Ellis, Roger Mills, Woodward	3 hr
May 27, 10:16 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	25 min
May 27, 11:32 PM CDT	Special Weather Statement	OUN	Alfalfa, Major	43 min
May 27, 11:34 PM CDT	Special Weather Statement	OUN	Roger Mills	26 min
May 28, 12:05 AM CDT	Special Weather Statement	OUN	Alfalfa	25 min
May 28, 12:31 AM CDT	Special Weather Statement	OUN	Garfield, Grant	29 min
May 28, 12:37 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Harmon	38 min
May 28, 12:40 AM CDT	Special Weather Statement	OUN	Alfalfa	35 min
May 28, 12:48 AM CDT	Special Weather Statement	OUN	Blaine	27 min
May 28, 1:01 AM CDT	Special Weather Statement	OUN	Kay	29 min
May 28, 1:10 AM CDT	Special Weather Statement	OUN	Blaine	50 min
May 28, 1:14 AM CDT	Special Weather Statement	OUN	Greer, Harmon	31 min
May 28, 1:38 AM CDT	Special Weather Statement	OUN	Kay	67 min
May 28, 1:41 AM CDT	Areal Flood Advisory	OUN	Grant, Kay	5 hr
May 28, 1:49 AM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Kiowa	26 min
May 28, 1:58 AM CDT	Areal Flood Advisory	OUN	Blaine	5 hr
May 28, 2:39 AM CDT	Special Weather Statement	OUN	Major	66 min
May 28, 2:48 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Harmon, Jackson, Kiowa, Tillman and 1 more	27 min
May 28, 3:07 AM CDT	Areal Flood Advisory	OUN	Alfalfa, Major, Woods	5 hr
May 28, 3:14 AM CDT	River Flood Warning	OUN	Kingfisher, Logan	56 hr
May 28, 3:23 AM CDT	Special Weather Statement	OUN	Caddo, Comanche, Cotton, Grady, Jackson, Kiowa and 1 more	37 min
May 28, 3:40 AM CDT	Special Weather Statement	OUN	Garfield	35 min
May 28, 4:10 AM CDT	Special Weather Statement	OUN	Caddo, Comanche, Cotton, Grady	35 min
May 28, 4:43 AM CDT	Special Weather Statement	OUN	Canadian, Cleveland, Comanche, Cotton, Grady, Jefferson and 3 more	62 min
May 28, 4:48 AM CDT	Special Weather Statement	OUN	Kingfisher	27 min
May 28, 4:56 AM CDT	Areal Flood Advisory	OUN	Canadian	3 hr
May 28, 5:21 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	24 min
May 28, 5:26 AM CDT	Flash Flood Warning	OUN	Canadian	3 hr
May 28, 5:41 AM CDT	Special Weather Statement	OUN	Carter, Cleveland, Garvin, Love, McClain, Murray and 2 more	64 min
May 28, 5:46 AM CDT	Areal Flood Advisory	OUN	Cleveland, Oklahoma	3 hr
May 28, 6:16 AM CDT	Tornado Warning	OUN	Cleveland, Pottawatomie	9 min
May 28, 6:24 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	24 min
May 28, 6:50 AM CDT	Special Weather Statement	OUN	Carter, Johnston, Lincoln, Love, Marshall, Murray and 3 more	25 min
May 28, 7:07 AM CDT	Areal Flood Advisory	OUN	Carter, Cleveland, Coal, Garvin, Hughes, Jefferson and 8 more	3 hr
May 28, 7:15 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Johnston, Marshall, Pontotoc	60 min
May 28, 8:09 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal	51 min
May 28, 8:35 AM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Coal, Johnston, Marshall	3 hr
May 28, 2:33 PM CDT	Special Weather Statement	OUN	Stephens	27 min
May 28, 2:46 PM CDT	River Flood Warning	OUN	Garvin	38 hr
May 28, 2:52 PM CDT	Special Weather Statement	OUN	Comanche	23 min
May 28, 2:58 PM CDT	River Flood Warning	OUN	Jackson, Kiowa, Tillman	67 hr
May 28, 2:59 PM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	46 min
May 28, 3:15 PM CDT	River Flood Warning	OUN	Cotton	3 days
May 28, 3:17 PM CDT	Special Weather Statement	OUN	Comanche	28 min
May 28, 3:23 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	52 min
May 28, 3:35 PM CDT	Special Weather Statement	OUN	Cleveland	25 min
May 28, 3:41 PM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Grady, McClain, Stephens	3 hr
May 28, 3:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	32 min
May 28, 4:14 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady, McClain	33 min
May 28, 4:20 PM CDT	Flash Flood Warning	OUN	Comanche	3 hr
May 28, 4:24 PM CDT	Special Weather Statement	OUN	Comanche	36 min
May 28, 4:29 PM CDT	Flash Flood Warning	OUN	Comanche, Grady	3 hr
May 28, 4:34 PM CDT	Special Weather Statement	OUN	Cleveland	26 min
May 28, 4:59 PM CDT	Special Weather Statement	OUN	Comanche	31 min
May 28, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	21 min
May 28, 5:40 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	50 min
May 28, 5:58 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	47 min
May 28, 6:03 PM CDT	Special Weather Statement	OUN	Comanche	27 min
May 28, 6:17 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens, Tillman	58 min
May 28, 6:32 PM CDT	Special Weather Statement	OUN	Stephens	28 min
May 28, 6:44 PM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Tillman	2 hr
May 28, 3:01 AM CDT	Special Weather Statement	OUN	Foard	44 min
May 28, 4:44 AM CDT	River Flood Warning	OUN	Wichita, Wilbarger	7 days
May 28, 1:38 PM CDT	Special Weather Statement	OUN	Wilbarger	22 min
May 28, 1:49 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	22 min
May 28, 2:17 PM CDT	Special Weather Statement	OUN	Foard	28 min
May 28, 2:29 PM CDT	Severe Thunderstorm Warning	OUN	Foard	61 min
May 28, 3:06 PM CDT	Tornado Warning	OUN	Foard, Hardeman	24 min
May 28, 3:28 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	47 min
May 28, 3:34 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	41 min
May 28, 4:12 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	63 min
May 28, 4:36 PM CDT	Areal Flood Advisory	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	3 hr
May 28, 5:00 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	45 min
May 28, 5:59 PM CDT	Areal Flood Advisory	OUN	Archer, Wichita	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 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; radar from the NEXRAD Level II archive.