Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1746

July 26, 2011Roosevelt County, Sheridan County, Montana; 16 counties in North Dakota; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2011, 9:45 AM MDT for Roosevelt County, Sheridan County, Montana; 16 counties in North Dakota; 5 counties in South Dakota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2011, 9:45 AM MDT (15:45 UTC)
Expired: Jul 26, 2011, 10:45 AM MDT
In force: 60 min
Issued by: the Storm Prediction Center

All 23 counties

Roosevelt County, MT, Sheridan County, MT, Burke County, ND, Burleigh County, ND, Divide County, ND, Emmons County, ND, Kidder County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McLean County, ND, Mercer County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Sheridan County, ND, Ward County, ND, Williams County, ND, Campbell County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, McPherson County, SD

The radar

The Bismarck radar (KBIS), 52 km from the middle of the area, began a volume at 15:48 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

Aberdeen, SD (KABR), launched 12:00Z, 3.8 hours before the alert went out and 323 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: 154 J/kg
Mixed-layer CIN: -337 J/kg
Mixed-layer LCL: 1066 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 203 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
Jul 25, 9:07 PM MDT	Mesoscale Discussion	SPC	Dawson, McCone, Prairie	83 min
Jul 26, 1:07 PM MDT	Mesoscale Discussion	SPC	Daniels, Dawson, Fallon, Garfield, McCone, Petroleum and 7 more	53 min
Jul 26, 2:43 PM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, Garfield, McCone, Petroleum, Prairie and 5 more	5 hr
Jul 26, 2:59 PM MDT	Mesoscale Discussion	SPC	Dickey, Emmons, LaMoure, Logan, McIntosh, Sargent and 1 more	2 hr
Jul 26, 4:21 PM MDT	Tornado Watch	SPC	Dickey, Emmons, LaMoure, Logan, McIntosh, Sioux	5 hr
Jul 25, 8:33 PM MDT	Mesoscale Discussion	SPC	Beadle, Brookings, Buffalo, Hamlin, Hand, Hughes and 9 more	57 min
Jul 26, 4:06 PM MDT	Mesoscale Discussion	SPC	Mellette, Todd	84 min
Jul 26, 4:43 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brule, Charles Mix, Douglas, Gregory and 4 more	7 hr

Nearby

Mesoscale Discussions in North Dakota, 2011 Mesoscale Discussions in South Dakota, 2011 Mesoscale Discussions in Montana, 2011 Every mesoscale discussion in 2011

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.