Alert archive / Minnesota / Mesoscale Discussions in 2020

Mesoscale Discussion 1479

August 13, 202017 counties in Minnesota; 5 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2020, 8:26 PM CDT for 17 counties in Minnesota; 5 counties in North Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Aug 13, 2020, 8:26 PM CDT (01:26 UTC)
Expired
Aug 13, 2020, 10:00 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 433
All 22 counties

Becker County, MN, Beltrami County, MN, Clay County, MN, Clearwater County, MN, Hubbard County, MN, Koochiching County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wadena County, MN, Wilkin County, MN, Cass County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 103 km from the middle of the area, began a volume at 01:30 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

International Fa, MN (KINL), launched 00:00Z, 1.4 hours before the alert went out and 241 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, International Fa, MN at 00:00Z on 2020-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1650 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, International Fa, MN at 00:00Z on 2020-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
1650 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
636 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 14, 12:33 AM CDTMesoscale DiscussionSPCAitkin, Becker, Benton, Cass, Crow Wing, Douglas and 15 more87 min
Aug 14, 6:06 AM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Mahnomen, Marshall and 5 more114 min
Aug 14, 6:41 AM CDTSevere Thunderstorm WatchSPCBecker, Beltrami, Clay, Clearwater, Grant, Hubbard and 8 more7 hr
Aug 14, 10:19 AM CDTMesoscale DiscussionSPCBecker, Beltrami, Clay, Clearwater, Douglas, Grant and 9 more86 min
Aug 14, 1:57 PM CDTMesoscale DiscussionSPCBenton, Big Stone, Blue Earth, Brown, Carver, Chippewa and 38 more2 hr
Aug 14, 2:17 PM CDTSevere Thunderstorm WatchSPCCottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more6 hr
Aug 14, 2:36 PM CDTTornado WatchSPCBenton, Big Stone, Brown, Chippewa, Douglas, Grant and 18 more5 hr
Aug 14, 4:53 PM CDTMesoscale DiscussionSPCBig Stone, Chippewa, Douglas, Grant, Kandiyohi, Lac qui Parle and 15 more97 min
Aug 14, 5:35 PM CDTMesoscale DiscussionSPCBrown, Cottonwood, Jackson, Murray, Nobles, Rock and 1 more85 min
Aug 14, 5:38 PM CDTSevere Thunderstorm WatchSPCAitkin, Anoka, Carlton, Carver, Chisago, Crow Wing and 13 more5 hr
Aug 13, 11:28 PM CDTMesoscale DiscussionSPCAdams, Bowman, Burleigh, Emmons, Grant, Hettinger and 3 more2 hr
Aug 14, 12:50 AM CDTSevere Thunderstorm WatchSPCAdams, Burleigh, Dickey, Emmons, Grant, Hettinger and 8 more8 hr
Aug 14, 2:12 AM CDTMesoscale DiscussionSPCAdams, Emmons, Grant, Hettinger, Morton, Sioux93 min
Aug 14, 5:14 AM CDTMesoscale DiscussionSPCEmmons, Grant, Kidder, LaMoure, Logan, McIntosh and 2 more91 min

Nearby

Mesoscale Discussions in Minnesota, 2020Mesoscale Discussions in North Dakota, 2020Every mesoscale discussion in 2020

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.