Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 393

April 5, 200320 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2003, 6:55 PM CST for 20 counties in Oklahoma. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 5, 2003, 6:55 PM CST (00:55 UTC)
Expired: Apr 5, 2003, 8:30 PM CST
In force: 95 min
Issued by: the Storm Prediction Center

Counties Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, McClain County, OK, Oklahoma County, OK, Stephens County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 79 km from the middle of the area, began a volume at 00:59 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 95Apr 5, 7:10 PM CST

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.9 hours before the alert went out and 120 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: 2069 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 456 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 5, 6:35 PM CST	Mesoscale Discussion	SPC	Love	115 min
Apr 5, 6:40 PM CST	Tornado Watch	SPC	Jackson	5 hr
Apr 5, 7:10 PM CST	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 25 more	5 hr
Apr 5, 8:04 PM CST	Mesoscale Discussion	SPC	Love	116 min
Apr 5, 9:35 PM CST	Tornado Watch	SPC	Love	5 hr
Apr 5, 11:10 PM CST	Mesoscale Discussion	SPC	Adair, Alfalfa, Atoka, Beckham, Blaine, Bryan and 54 more	65 min
Apr 5, 11:35 PM CST	Severe Thunderstorm Watch	SPC	Atoka, Beckham, Blaine, Caddo, Canadian, Carter and 51 more	5 hr
Apr 6, 5:09 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Atoka, Beckham, Blaine, Caddo, Canadian and 47 more	96 min
Apr 6, 5:35 AM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Caddo, Canadian, Carter, Cherokee and 46 more	4 hr
Apr 6, 7:45 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 44 more	2 hr
Apr 6, 9:45 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 26 more	5 hr
Apr 6, 12:27 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Cherokee, Choctaw, Coal, Haskell and 17 more	2 hr
Apr 6, 2:18 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Choctaw, Haskell, Latimer and 5 more	57 min
Apr 6, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	Choctaw, LeFlore, McCurtain, Pushmataha, Sequoyah	5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2003 Every mesoscale discussion 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.