Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 809

June 4, 20209 counties in Arkansas; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2020, 5:44 AM CDT for 9 counties in Arkansas; 4 counties in Missouri. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2020, 5:44 AM CDT (10:44 UTC)
Expired: Jun 4, 2020, 6:45 AM CDT
In force: 61 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 248

Counties Boone County, AR, Carroll County, AR, Johnson County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Searcy County, AR, Van Buren County, AR, Barry County, MO, Christian County, MO, Stone County, MO, Taney County, MO

The radar

The Springfield radar (KSGF), 100 km from the middle of the area, began a volume at 10:48 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, 10.7 hours before the alert went out and 78 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: 1794 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1420 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 4, 12:32 PM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 13 more	58 min
Jun 3, 8:54 PM CDT	Mesoscale Discussion	SPC	Atchison, Holt	2 hr
Jun 3, 9:38 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Buchanan, Clay, Clinton, Holt and 3 more	6 hr
Jun 3, 10:44 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Bates, Buchanan, Caldwell, Cass and 11 more	2 hr
Jun 4, 12:54 AM CDT	Mesoscale Discussion	SPC	Andrew, Barton, Bates, Buchanan, Caldwell, Cass and 16 more	96 min
Jun 4, 2:07 AM CDT	Severe Thunderstorm Watch	SPC	Barton, Bates, Cass, Cedar, Dade, Greene and 7 more	5 hr
Jun 4, 3:32 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Cedar, Dade, Greene and 6 more	88 min
Jun 4, 2:42 PM CDT	Mesoscale Discussion	SPC	Mississippi, Scott	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2020 Mesoscale Discussions in Missouri, 2020 Every mesoscale discussion in 2020

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.