Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 835

May 9, 20087 counties in Arkansas; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 9, 2008, 3:45 AM CDT for 7 counties in Arkansas; 4 counties in Missouri. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 9, 2008, 3:45 AM CDT (08:45 UTC)
Expired: May 9, 2008, 4:45 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Benton County, AR, Boone County, AR, Carroll County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Washington County, AR, Barry County, MO, McDonald County, MO, Stone County, MO, Taney County, MO

The radar

The Springfield radar (KSGF), 102 km from the middle of the area, began a volume at 08:46 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 00:00Z, 8.8 hours before the alert went out and 63 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: 3 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 750 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 17 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
May 9, 1:21 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Boone, Carroll, Madison, Marion, Newton and 2 more	3 hr
May 9, 3:29 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Cleburne, Craighead, Crittenden, Cross and 20 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Missouri, 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.