Alert archive / South Dakota / Mesoscale Discussions in 2009

Mesoscale Discussion 239

March 23, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2009, 11:06 AM MDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Mar 23, 2009, 11:06 AM MDT (17:06 UTC)
Expired: Mar 23, 2009, 4:00 PM MDT
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Carter County, MT, Fallon County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Hettinger County, ND, Slope County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 110 km from the middle of the area, began a volume at 17:06 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 5.1 hours before the alert went out and 337 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: 488 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Mar 23, 3:59 AM MDT	Mesoscale Discussion	SPC	Carter, Powder River	6 hr
Mar 23, 5:56 PM MDT	Mesoscale Discussion	SPC	Carter	3 hr
Mar 22, 10:28 PM MDT	Mesoscale Discussion	SPC	Brookings, Deuel, Grant	3 hr
Mar 23, 9:13 AM MDT	Mesoscale Discussion	SPC	Gregory	2 hr
Mar 23, 11:16 AM MDT	Tornado Watch	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 17 more	4 hr
Mar 23, 2:11 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Gregory, Hutchinson, Lincoln and 3 more	94 min
Mar 23, 2:50 PM MDT	Tornado Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 27 more	6 hr
Mar 23, 5:04 PM MDT	Mesoscale Discussion	SPC	Beadle, Hand, Hanson, Hughes, Hyde, Jerauld and 10 more	116 min

Nearby

Mesoscale Discussions in South Dakota, 2009 Mesoscale Discussions in Wyoming, 2009 Mesoscale Discussions in North Dakota, 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.