Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 2345

October 31, 200815 counties in Arkansas; LeFlore County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Oct 31, 2008, 5:26 PM CDT for 15 counties in Arkansas; LeFlore County, Oklahoma. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Oct 31, 2008, 5:26 PM CDT (22:26 UTC)
Expired: Oct 31, 2008, 6:30 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Conway County, AR, Franklin County, AR, Garland County, AR, Hot Spring County, AR, Johnson County, AR, Logan County, AR, Montgomery County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Van Buren County, AR, Yell County, AR, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 89 km from the middle of the area, began a volume at 22:28 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, 10.4 hours before the alert went out and 218 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: 1305 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 467 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
Oct 31, 12:02 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more	88 min
Oct 31, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	Conway, Franklin, Garland, Hot Spring, Johnson, Logan and 9 more	3 hr

Nearby

Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Oklahoma, 2008 Every mesoscale discussion in 2008

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.