Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 404, NWS Norman, OK

May 31, 1999Caddo County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 31, 1999, 9:23 PM CDT for Caddo County, Oklahoma. It was in force for 52 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 31, 1999, 9:23 PM CDT (02:23 UTC)
Expired: May 31, 1999, 10:15 PM CDT
In force: 52 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Caddo County, OK

The radar

The Norman radar (KTLX), 101 km from the middle of the area, began a volume at 02:24 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.

What was reported inside it

Time	Report	Where	Remark
May 31, 9:23 PM CDT	Thunderstorm Wind 61	Cyril, OK

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 31, 6:45 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.4 hours before the alert went out and 89 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: 1985 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 31, 9:10 PM CDT, 13 minutes earlier.

Area forecast discussion, May 31, 9:10 PM CDT, 13 minutes before

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In the hours before

Local storm report, May 31, 8:27 PM CDT, 56 minutes before

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Local storm report, May 31, 8:27 PM CDT, 56 minutes before

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Local storm report, May 31, 8:33 PM CDT, 50 minutes before

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Local storm report, May 31, 8:33 PM CDT, 50 minutes before

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Local storm report, May 31, 8:38 PM CDT, 45 minutes before

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Local storm report, May 31, 8:38 PM CDT, 45 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 31, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon	39 min
May 31, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	49 min
May 31, 7:13 PM CDT	Tornado Warning	OUN	Beckham	32 min
May 31, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woods, Woodward	50 min
May 31, 7:25 PM CDT	Tornado Warning	OUN	Greer	35 min
May 31, 7:42 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	48 min
May 31, 7:45 PM CDT	Tornado Warning	OUN	Harmon	30 min
May 31, 7:48 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	57 min
May 31, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	49 min
May 31, 8:01 PM CDT	Tornado Warning	OUN	Greer	29 min
May 31, 8:18 PM CDT	Tornado Warning	OUN	Greer, Jackson	27 min
May 31, 8:25 PM CDT	Tornado Warning	OUN	Woods	65 min
May 31, 8:25 PM CDT	Tornado Warning	OUN	Greer, Kiowa	35 min
May 31, 8:39 PM CDT	Flash Flood Warning	OUN	Beckham	2 hr
May 31, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	46 min
May 31, 8:48 PM CDT	Tornado Warning	OUN	Jackson, Kiowa	27 min
May 31, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	49 min
May 31, 9:06 PM CDT	Tornado Warning	OUN	Comanche, Kiowa	24 min
May 31, 9:25 PM CDT	Tornado Warning	OUN	Comanche, Kiowa	35 min
May 31, 9:28 PM CDT	Tornado Warning	OUN	Woods	62 min
May 31, 9:32 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	28 min
May 31, 9:56 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	64 min
May 31, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	41 min
May 31, 10:11 PM CDT	Tornado Warning	OUN	Alfalfa	34 min
May 31, 10:22 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	53 min
May 31, 10:28 PM CDT	Severe Thunderstorm Warning	OUN	Woods	47 min
May 31, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	64 min
May 31, 11:00 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	60 min
May 31, 11:01 PM CDT	Tornado Warning	OUN	Alfalfa	29 min
May 31, 11:17 PM CDT	Tornado Warning	OUN	Grant	43 min
May 31, 11:29 PM CDT	Flash Flood Warning	OUN	Alfalfa	2 hr
May 31, 11:57 PM CDT	Tornado Warning	OUN	Garfield	33 min
May 31, 11:59 PM CDT	Severe Thunderstorm Warning	OUN	Grant	46 min
Jun 1, 12:33 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	42 min
Jun 1, 12:50 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	55 min
Jun 1, 1:10 AM CDT	Flash Flood Warning	OUN	Garfield	3 hr
Jun 1, 5:41 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	49 min
Jun 1, 6:23 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	52 min
May 31, 7:49 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	41 min
May 31, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	43 min
May 31, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	49 min
May 31, 9:50 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	40 min
May 31, 10:33 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	57 min
May 31, 11:07 PM CDT	Severe Thunderstorm Warning	OUN	Wichita	38 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.