Alert archive / Oklahoma / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 147

April 23, 200321 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Apr 23, 2003, 1:20 PM CDT for 21 counties in Oklahoma. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 23, 2003, 1:20 PM CDT (18:20 UTC)
Expired: Apr 23, 2003, 7:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 21 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Altus AFB radar (KFDR), 141 km from the middle of the area, began a volume at 18:23 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

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

Issued	Product	Office	Counties	Lasted
Apr 23, 4:31 PM CDT	Severe Thunderstorm Warning	OUN	Greer	29 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.3 hours before the alert went out and 155 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1075 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 2:58 AM CDT	Mesoscale Discussion	SPC	Harmon	2 hr
Apr 23, 9:55 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Creek and 17 more	65 min
Apr 23, 10:30 AM CDT	Mesoscale Discussion	SPC	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 4 more	90 min
Apr 23, 11:50 AM CDT	Tornado Watch	SPC	Comanche, Cotton, Harmon, Jackson, Tillman	6 hr
Apr 23, 1:26 PM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Harmon, Jackson, Tillman	94 min
Apr 23, 2:44 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 15 more	91 min
Apr 23, 3:08 PM CDT	Mesoscale Discussion	SPC	Carter, Comanche, Cotton, Garvin, Jackson, Jefferson and 5 more	97 min
Apr 23, 4:00 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Carter, Jefferson, Johnston, Love and 3 more	6 hr
Apr 23, 5:36 PM CDT	Mesoscale Discussion	SPC	Cotton, Tillman	54 min
Apr 23, 5:47 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 16 more	88 min
Apr 23, 6:00 PM CDT	Tornado Watch	SPC	Comanche, Cotton, Stephens, Tillman	4 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2003 Every severe thunderstorm watch in 2003

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.