Alert archive / North Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 2131

August 22, 20088 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2008, 2:27 AM CDT for 8 counties in North Dakota. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Aug 22, 2008, 2:27 AM CDT (07:27 UTC)
Expired: Aug 22, 2008, 4:00 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Benson County, ND, Burleigh County, ND, Eddy County, ND, Foster County, ND, McHenry County, ND, Pierce County, ND, Sheridan County, ND, Wells County, ND

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 844Aug 22, 3:00 AM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 7.5 hours before the alert went out and 116 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: 1489 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 2059 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

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
Aug 22, 3:05 AM CDT	Severe Thunderstorm Watch	SPC	Benson, Cavalier, Eddy, Foster, Grand Forks, Griggs and 11 more	4 hr

Nearby

Mesoscale Discussions in North Dakota, 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.