Alert archive / Oklahoma / Mesoscale Discussions in 2003

Mesoscale Discussion 674

May 1, 200316 counties in Arkansas; 17 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 8:54 PM CDT for 16 counties in Arkansas; 17 counties in Oklahoma. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 1, 2003, 8:54 PM CDT (01:54 UTC)
Expired: May 1, 2003, 10:30 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 33 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Hempstead County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 49 km from the middle of the area, began a volume at 01:56 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 205May 1, 9:00 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.9 hours before the alert went out and 231 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: 1247 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 891 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.7

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 1, 9:00 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Columbia, Garland, Hempstead, Hot Spring, Howard and 10 more	4 hr
May 1, 11:53 PM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Garland, Hempstead, Hot Spring, Howard and 10 more	67 min
May 2, 1:27 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Clay, Craighead, Fulton and 8 more	2 hr
May 2, 2:21 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Columbia, Desha, Drew and 1 more	114 min
May 2, 2:55 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 13 more	6 hr
May 2, 6:31 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more	119 min

Nearby

Mesoscale Discussions in Oklahoma, 2003 Mesoscale Discussions in Arkansas, 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.