Alert archive / North Dakota / Mesoscale Discussions in 2017

Mesoscale Discussion 1430

July 31, 2017Kittson County, Marshall County, Minnesota; 20 counties in North Dakota; Corson County, Perkins County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2017, 3:43 PM CDT for Kittson County, Marshall County, Minnesota; 20 counties in North Dakota; Corson County, Perkins County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 31, 2017, 3:43 PM CDT (20:43 UTC)
Expired
Jul 31, 2017, 6:15 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 24 counties

Kittson County, MN, Marshall County, MN, Adams County, ND, Benson County, ND, Burleigh County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Grant County, ND, Griggs County, ND, Kidder County, ND, Logan County, ND, Morton County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Sioux County, ND, Steele County, ND, Stutsman County, ND, Walsh County, ND, Wells County, ND, Corson County, SD, Perkins County, SD

The radar

The Bismarck radar (KBIS), 77 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 72 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 2017-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 425 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 2017-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -39 square meters per square second.1939Sfc1 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
425 J/kg
Mixed-layer CIN
-271 J/kg
Mixed-layer LCL
1028 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-39 m²/s²
0-3 km storm-relative helicity
7 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in North Dakota, 2017Mesoscale Discussions in Minnesota, 2017Mesoscale Discussions in South Dakota, 2017Every mesoscale discussion in 2017

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.