Alert archive / Oklahoma / Tornado Watches in 1999

Tornado Watch 206

May 4, 199947 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this tornado watch at May 4, 1999, 5:00 AM CDT for 47 counties in Oklahoma; 4 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 4, 1999, 5:00 AM CDT (10:00 UTC)
Expired: May 4, 1999, 11:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 51 counties

Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Custer County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Washington County, OK, Washita County, OK, Foard County, TX, Hardeman County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 73 km from the middle of the area, began a volume at 10:03 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 4, 6:15 AM CDT	Tornado Warning	OUN	Garfield, Noble	30 min
May 4, 6:41 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	49 min
May 4, 6:45 AM CDT	Tornado Warning	OUN	Kay, Noble	45 min
May 4, 7:03 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	42 min
May 4, 7:13 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	47 min
May 4, 7:13 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	47 min
May 4, 7:26 AM CDT	Tornado Warning	TSA	Osage	34 min
May 4, 7:28 AM CDT	Tornado Warning	OUN	Caddo, Grady	47 min
May 4, 7:29 AM CDT	Tornado Warning	OUN	Kay	31 min
May 4, 7:41 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	49 min
May 4, 7:41 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma	49 min
May 4, 7:44 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kay, Noble	46 min
May 4, 7:49 AM CDT	Severe Thunderstorm Warning	OUN	Payne	41 min
May 4, 7:57 AM CDT	Tornado Warning	OUN	Lincoln	33 min
May 4, 7:57 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	48 min
May 4, 7:57 AM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	48 min
May 4, 8:12 AM CDT	Tornado Warning	OUN	Payne	48 min
May 4, 8:28 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Logan, Noble, Payne	47 min
May 4, 8:28 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma	47 min
May 4, 8:33 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain	42 min
May 4, 8:33 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland	42 min
May 4, 8:37 AM CDT	Severe Thunderstorm Warning	TSA	Pawnee	38 min
May 4, 8:55 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	50 min
May 4, 9:04 AM CDT	Severe Thunderstorm Warning	TSA	Osage	56 min
May 4, 9:32 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	43 min
May 4, 10:16 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	44 min
May 4, 10:17 AM CDT	Severe Thunderstorm Warning	TSA	Nowata	43 min

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 10.0 hours before the alert went out and 59 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: 2379 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 13.3

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
May 3, 7:15 PM CDT	Tornado Watch	SPC	Alfalfa, Blaine, Bryan, Caddo, Canadian, Carter and 33 more	5 hr
May 3, 7:30 PM CDT	Tornado Watch	SPC	Love, Marshall	5 hr
May 3, 10:45 PM CDT	Tornado Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 42 more	6 hr
May 3, 11:30 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 16 more	6 hr
May 4, 12:00 AM CDT	Tornado Watch	SPC	Craig, Kay, Nowata, Osage, Ottawa, Washington	5 hr
May 4, 11:00 AM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 27 more	5 hr
May 4, 3:00 PM CDT	Tornado Watch	SPC	Adair, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more	6 hr
May 4, 3:00 AM CDT	Tornado Watch	SPC	Bandera, Brown, Burnet, Concho, Coryell, Crockett and 18 more	2 hr
May 4, 5:00 AM CDT	Tornado Watch	SPC	Archer, Baylor, Blanco, Bosque, Brown, Burnet and 46 more	6 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; radar from the NEXRAD Level II archive.