Alert archive / North Dakota / Mesoscale Discussions in 2017

Mesoscale Discussion 1428

July 29, 201718 counties in North Dakota; Harding County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2017, 1:01 PM MDT for 18 counties in North Dakota; Harding County, South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jul 29, 2017, 1:01 PM MDT (19:01 UTC)
Expired
Jul 29, 2017, 2:30 PM MDT
In force
89 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Billings County, ND, Bottineau County, ND, Bowman County, ND, Burke County, ND, Cavalier County, ND, Dunn County, ND, McHenry County, ND, McKenzie County, ND, Mountrail County, ND, Pembina County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Slope County, ND, Stark County, ND, Towner County, ND, Ward County, ND, Williams County, ND, Harding County, SD

The radar

The Minot AFB radar (KMBX), 115 km from the middle of the area, began a volume at 19:02 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, 7.0 hours before the alert went out and 125 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 2017-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 118 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 2017-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
118 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
1200 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
57 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 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.