Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 836

May 7, 200319 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 11:51 PM CDT for 19 counties in Oklahoma; 9 counties in Texas. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 7, 2003, 11:51 PM CDT (04:51 UTC)
Expired: May 8, 2003, 12:45 AM CDT
In force: 54 min
Issued by: the Storm Prediction Center

All 28 counties

Beckham County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Stephens County, OK, Tillman County, OK, Clay County, TX, Cooke County, TX, Fannin County, TX, Foard County, TX, Grayson County, TX, Hardeman County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 74 km from the middle of the area, began a volume at 04:52 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 296May 8, 3:50 AM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.9 hours before the alert went out and 146 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: 1026 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.9

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
May 7, 8:01 PM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Comanche, Cotton, Greer, Harmon and 4 more	59 min
May 7, 10:35 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Cherokee, Cleveland and 29 more	55 min
May 7, 10:35 PM CDT	Tornado Watch	SPC	Beckham, Bryan, Carter, Coal, Comanche, Cotton and 13 more	5 hr
May 7, 10:55 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 39 more	5 hr
May 8, 1:18 AM CDT	Mesoscale Discussion	SPC	Adair, Blaine, Cherokee, Craig, Custer, Delaware and 19 more	3 hr
May 8, 1:55 AM CDT	Severe Thunderstorm Watch	SPC	Craig, Delaware, Grant, Kay, Nowata, Osage and 2 more	5 hr
May 8, 1:57 AM CDT	Mesoscale Discussion	SPC	Atoka, Beckham, Bryan, Carter, Coal, Comanche and 14 more	2 hr
May 8, 3:50 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 25 more	3 hr
May 8, 3:51 AM CDT	Mesoscale Discussion	SPC	Ottawa	3 hr
May 8, 5:02 AM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Cherokee, Choctaw, Coal, Creek and 24 more	2 hr
May 8, 6:20 AM CDT	Tornado Watch	SPC	Haskell, Latimer, LeFlore, Sequoyah	3 hr
May 8, 12:49 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Garfield, Grant, Kingfisher, Kiowa and 1 more	3 hr
May 8, 1:35 PM CDT	Tornado Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more	7 hr
May 8, 3:34 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Caddo, Canadian, Carter, Cleveland, Comanche and 25 more	116 min
May 8, 4:47 PM CDT	Mesoscale Discussion	SPC	Canadian, Cleveland, Grady, Lincoln, Logan, McClain and 3 more	58 min
May 8, 5:31 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Coal, Craig, Creek, Delaware and 17 more	59 min
May 8, 5:45 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Coal, Craig, Delaware, Haskell and 17 more	5 hr
May 8, 6:38 PM CDT	Mesoscale Discussion	SPC	Adair, Carter, Cherokee, Cleveland, Coal, Craig and 35 more	2 hr
May 7, 8:15 PM CDT	Tornado Watch	SPC	Bosque, Coryell, Ellis, Erath, Freestone, Hamilton and 7 more	6 hr
May 8, 2:43 PM CDT	Mesoscale Discussion	SPC	Archer, Bosque, Brown, Burnet, Callahan, Clay and 28 more	62 min
May 8, 3:40 PM CDT	Tornado Watch	SPC	Archer, Brown, Callahan, Clay, Coleman, Comanche and 18 more	5 hr

Nearby

Mesoscale Discussions in Oklahoma, 2003 Mesoscale Discussions in Texas, 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.