Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 1498

July 4, 200411 counties in Arkansas; 15 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2004, 1:25 PM CDT for 11 counties in Arkansas; 15 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 4, 2004, 1:25 PM CDT (18:25 UTC)
Expired: Jul 4, 2004, 3:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 26 counties

Benton County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Cherokee County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okmulgee County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Western Arkansas radar (KSRX), 56 km from the middle of the area, began a volume at 18:27 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

Springfield, MO (KSGF), launched 12:00Z, 6.4 hours before the alert went out and 151 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: 1470 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1244 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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
Jul 4, 5:05 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	5 hr
Jul 4, 6:08 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	2 hr
Jul 4, 6:09 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	2 hr
Jul 4, 9:00 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 28 more	5 hr
Jul 4, 10:38 AM CDT	Mesoscale Discussion	SPC	Arkansas, Clay, Craighead, Crittenden, Cross, Greene and 11 more	2 hr
Jul 4, 11:35 AM CDT	Severe Thunderstorm Watch	SPC	Crittenden, Mississippi	4 hr
Jul 4, 3:21 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Roger Mills, Woods, Woodward	84 min
Jul 4, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Beckham, Dewey, Ellis, Greer, Harper and 3 more	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2004 Mesoscale Discussions in Arkansas, 2004 Every mesoscale discussion in 2004

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.