Alert archive / Oklahoma / Tornado Watches in 1999

Tornado Watch 104

April 2, 199934 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 2, 1999, 8:30 PM CST for 34 counties in Oklahoma; 6 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 2, 1999, 8:30 PM CST (02:30 UTC)
Expired: Apr 3, 1999, 2:00 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 40 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hemphill County, TX, Lipscomb County, TX, Wheeler County, TX

Warnings issued inside it

22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 2, 8:35 PM CST	Tornado Warning	OUN	Washita	40 min
Apr 2, 8:37 PM CST	Severe Thunderstorm Warning	OUN	Roger Mills	53 min
Apr 2, 8:47 PM CST	Severe Thunderstorm Warning	OUN	Dewey	43 min
Apr 2, 9:11 PM CST	Tornado Warning	OUN	Custer, Washita	49 min
Apr 2, 9:15 PM CST	Severe Thunderstorm Warning	OUN	Major	45 min
Apr 2, 9:15 PM CST	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Wheeler	60 min
Apr 2, 9:27 PM CST	Severe Thunderstorm Warning	OUN	Roger Mills	48 min
Apr 2, 9:56 PM CST	Tornado Warning	OUN	Custer	49 min
Apr 2, 9:57 PM CST	Severe Thunderstorm Warning	OUN	Dewey	48 min
Apr 2, 10:03 PM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	42 min
Apr 2, 10:15 PM CST	Severe Thunderstorm Warning	AMA	Collingsworth	45 min
Apr 2, 10:42 PM CST	Severe Thunderstorm Warning	OUN	Dewey	33 min
Apr 2, 10:58 PM CST	Severe Thunderstorm Warning	OUN	Greer, Harmon	47 min
Apr 2, 11:02 PM CST	Severe Thunderstorm Warning	OUN	Blaine	43 min
Apr 2, 11:11 PM CST	Severe Thunderstorm Warning	OUN	Major	49 min
Apr 2, 11:36 PM CST	Severe Thunderstorm Warning	OUN	Woodward	24 min
Apr 2, 11:57 PM CST	Severe Thunderstorm Warning	OUN	Kiowa, Washita	48 min
Apr 3, 12:07 AM CST	Severe Thunderstorm Warning	OUN	Garfield	38 min
Apr 3, 12:44 AM CST	Severe Thunderstorm Warning	OUN	Major	31 min
Apr 3, 12:51 AM CST	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	39 min
Apr 3, 1:13 AM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	47 min
Apr 3, 1:58 AM CST	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	32 min

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.5 hours before the alert went out and 161 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: 1394 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 978 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.8

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.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 2, 9:00 PM CST	Tornado Watch	SPC	Jackson, Tillman	5 hr
Apr 3, 12:45 AM CST	Severe Thunderstorm Watch	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 32 more	5 hr
Apr 3, 3:45 AM CST	Severe Thunderstorm Watch	SPC	Adair, Cherokee, Craig, Delaware, Haskell, McIntosh and 7 more	5 hr
Apr 3, 7:15 AM CST	Severe Thunderstorm Watch	SPC	Bryan, Choctaw, McCurtain	6 hr
Apr 3, 12:00 PM CST	Tornado Watch	SPC	LeFlore, McCurtain	6 hr
Apr 3, 4:00 PM CST	Tornado Watch	SPC	Angelina, Hardin, Jasper, Liberty, Montgomery, Nacogdoches and 9 more	5 hr

Nearby

Tornado Watches in Oklahoma, 1999 Tornado Watches in Texas, 1999 Every tornado watch 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; the sounding from the Mesonet's radiosonde archive.