Alert archive / Minnesota / Mesoscale Discussions in 2020

Mesoscale Discussion 1606

August 28, 20205 counties in Iowa; 35 counties in Minnesota; Deuel County, Moody County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2020, 1:28 AM CDT for 5 counties in Iowa; 35 counties in Minnesota; Deuel County, Moody County, South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Aug 28, 2020, 1:28 AM CDT (06:28 UTC)
Expired
Aug 28, 2020, 3:00 AM CDT
In force
92 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...severe thunderstorm watch likely
Chance of a watch
95%
All 42 counties

Dickinson County, IA, Emmet County, IA, Lyon County, IA, Osceola County, IA, Winnebago County, IA, Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Hennepin County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Swift County, MN, Waseca County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Deuel County, SD, Moody County, SD

The radar

The Minneapolis radar (KMPX), 116 km from the middle of the area, began a volume at 06:30 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.5 hours before the alert went out and 114 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, Minneapolis, MN at 00:00Z on 2020-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 487 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, Minneapolis, MN at 00:00Z on 2020-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
487 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
1571 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 28, 6:59 AM CDTMesoscale DiscussionSPCAllamakee, Cerro Gordo, Chickasaw, Floyd, Hancock, Howard and 5 more91 min
Aug 28, 2:56 PM CDTMesoscale DiscussionSPCAdair, Adams, Allamakee, Appanoose, Audubon, Benton and 53 more64 min
Aug 28, 3:16 PM CDTSevere Thunderstorm WatchSPCBenton, Black Hawk, Buchanan, Cedar, Clayton, Clinton and 19 more4 hr
Aug 28, 5:29 PM CDTMesoscale DiscussionSPCAppanoose, Clinton, Davis, Des Moines, Henry, Jefferson and 8 more91 min
Aug 27, 11:30 PM CDTMesoscale DiscussionSPCLincoln, Pipestone, Rock2 hr
Aug 28, 1:54 AM CDTSevere Thunderstorm WatchSPCAnoka, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 36 more7 hr
Aug 28, 4:04 AM CDTMesoscale DiscussionSPCAnoka, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 31 more86 min
Aug 27, 9:20 PM CDTMesoscale DiscussionSPCBennett, Brule, Buffalo, Butte, Campbell, Corson and 27 more85 min
Aug 27, 10:20 PM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Brookings, Brown, Brule, Buffalo and 36 more5 hr

Nearby

Mesoscale Discussions in Minnesota, 2020Mesoscale Discussions in Iowa, 2020Mesoscale Discussions in South 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.