Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1825

August 1, 201129 counties in North Dakota; 18 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2011, 5:10 PM MDT for 29 counties in North Dakota; 18 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 1, 2011, 5:10 PM MDT (23:10 UTC)
Expired
Aug 1, 2011, 7:15 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
All 47 counties

Adams County, ND, Barnes County, ND, Benson County, ND, Burleigh County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Grant County, ND, Griggs County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Nelson County, ND, Oliver County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Sheridan County, ND, Sioux County, ND, Steele County, ND, Stutsman County, ND, Walsh County, ND, Wells County, ND, Brown County, SD, Butte County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, McPherson County, SD, Meade County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 100 km from the middle of the area, began a volume at 23:12 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, 11.2 hours before the alert went out and 98 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2236 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 341 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2236 J/kg
Mixed-layer CIN
-306 J/kg
Mixed-layer LCL
910 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
341 m²/s²
0-3 km storm-relative helicity
373 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.3

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.

IssuedProductOfficeCountiesLasted
Jul 31, 7:16 PM MDTMesoscale DiscussionSPCAdams, Grant, Morton, Sioux89 min
Jul 31, 9:26 PM MDTSevere Thunderstorm WatchSPCBarnes, Benson, Burleigh, Cass, Cavalier, Dickey and 25 more8 hr
Jul 31, 11:35 PM MDTMesoscale DiscussionSPCBarnes, Burleigh, Cass, Eddy, Emmons, Foster and 12 more85 min
Aug 1, 1:31 AM MDTMesoscale DiscussionSPCCass, Grand Forks, Griggs, Nelson, Steele, Traill and 1 more89 min
Aug 1, 3:57 AM MDTSevere Thunderstorm WatchSPCBarnes, Cass, Dickey, Eddy, Foster, Griggs and 11 more7 hr
Aug 1, 10:52 AM MDTSevere Thunderstorm WatchSPCBarnes, Cass, Grand Forks, Griggs, Nelson, Ransom and 4 more7 hr
Aug 1, 12:33 PM MDTMesoscale DiscussionSPCAdams, Burleigh, Emmons, Grant, Hettinger, Kidder and 10 more57 min
Aug 1, 1:19 PM MDTSevere Thunderstorm WatchSPCAdams, Bowman, Burleigh, Emmons, Grant, Hettinger and 10 more6 hr
Aug 1, 2:53 PM MDTMesoscale DiscussionSPCBarnes, Cass, Grand Forks, Griggs, Nelson, Ransom and 3 more67 min
Aug 1, 4:57 PM MDTMesoscale DiscussionSPCAdams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more2 hr

Nearby

Mesoscale Discussions in North Dakota, 2011Mesoscale Discussions in South Dakota, 2011Every 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.