Alert archive / Arkansas / Mesoscale Discussions in 2009

Mesoscale Discussion 760

May 8, 200912 counties in Arkansas; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 8, 2009, 11:08 AM CDT for 12 counties in Arkansas; 7 counties in Missouri. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 8, 2009, 11:08 AM CDT (16:08 UTC)
Expired: May 8, 2009, 12:15 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Baxter County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Johnson County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Washington County, AR, Christian County, MO, Douglas County, MO, Howell County, MO, Ozark County, MO, Taney County, MO, Texas County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 89 km from the middle of the area, began a volume at 16:11 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, 4.1 hours before the alert went out and 64 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: 3210 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 556 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 9.0

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 8, 4:31 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 3 more	59 min
May 8, 4:55 AM CDT	Severe Thunderstorm Watch PDS	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 10 more	7 hr
May 8, 7:17 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Fulton, Izard and 1 more	58 min
May 8, 8:37 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Faulkner, Greene and 12 more	53 min
May 8, 9:21 AM CDT	Tornado Watch	SPC	Clay, Cleburne, Craighead, Greene, Independence, Izard and 10 more	7 hr
May 8, 2:16 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 2 more	89 min
May 8, 3:24 PM CDT	Mesoscale Discussion	SPC	Greene, Mississippi	66 min
May 8, 3:42 PM CDT	Tornado Watch	SPC	Clay, Craighead, Greene, Mississippi, Poinsett	7 hr
May 8, 5:52 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 35 more	11 hr
May 7, 7:37 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more	6 hr
May 7, 9:38 PM CDT	Mesoscale Discussion	SPC	Audrain, Benton, Bollinger, Boone, Callaway, Camden and 34 more	97 min
May 7, 10:17 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Bollinger, Camden, Cape Girardeau, Carter, Cole and 31 more	8 hr
May 7, 11:46 PM CDT	Mesoscale Discussion	SPC	Bollinger, Cape Girardeau, Cole, Crawford, Dent, Franklin and 23 more	89 min
May 8, 3:34 AM CDT	Mesoscale Discussion	SPC	Mississippi	56 min

Nearby

Mesoscale Discussions in Arkansas, 2009 Mesoscale Discussions in Missouri, 2009 Every mesoscale discussion in 2009

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.