Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 870

May 8, 200322 counties in Oklahoma; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 11:14 PM CDT for 22 counties in Oklahoma; 15 counties in Texas. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 8, 2003, 11:14 PM CDT (04:14 UTC)
Expired: May 9, 2003, 12:45 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 37 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Fannin County, TX, Grayson County, TX, Hood County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 131 km from the middle of the area, began a volume at 04:17 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.2 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: 3798 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 929 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 330 m²/s²
0-3 km storm-relative helicity: 364 m²/s²
Significant tornado parameter: 8.2
Supercell composite: 31.1

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 8, 8:30 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 25 more	60 min
May 9, 2:52 PM CDT	Mesoscale Discussion	SPC	Caddo, Carter, Cleveland, Comanche, Cotton, Creek and 15 more	113 min
May 9, 3:35 PM CDT	Tornado Watch	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 18 more	5 hr
May 9, 4:45 PM CDT	Tornado Watch	SPC	Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 4 more	6 hr
May 9, 5:36 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more	84 min
May 9, 9:08 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Dickens, Fisher, Foard and 16 more	3 hr
May 9, 4:58 PM CDT	Mesoscale Discussion	SPC	Callahan, Coke, Concho, Crockett, Fisher, Glasscock and 11 more	32 min
May 9, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	Callahan, Coke, Crockett, Fisher, Irion, Jones and 10 more	6 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.