Alert archive / Minnesota / Mesoscale Discussions in 2020

Mesoscale Discussion 1252

July 17, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2020, 5:09 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 17, 2020, 5:09 PM CDT (22:09 UTC)
Expired
Jul 17, 2020, 7:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch likely
Chance of a watch
95%
All 56 counties

Aitkin County, MN, Anoka County, MN, Becker County, MN, Beltrami County, MN, Benton County, MN, Big Stone County, MN, Carlton County, MN, Cass County, MN, Chippewa County, MN, Chisago County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Isanti County, MN, Itasca County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Mahnomen County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Pine County, MN, Polk County, MN, Pope County, MN, Red Lake County, MN, Sherburne County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wilkin County, MN, Wright County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, LaMoure County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Marshall County, SD, Roberts County, SD, Burnett County, WI

The radar

The Fargo/Grand Forks radar (KMVX), 180 km from the middle of the area, began a volume at 22:13 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 12:00Z, 10.2 hours before the alert went out and 239 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 12:00Z on 2020-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1028 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 12:00Z on 2020-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
1028 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
924 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jul 17, 9:55 AM CDTMesoscale DiscussionSPCMurray, Nobles, Pipestone, Rock95 min
Jul 17, 12:30 PM CDTSevere Thunderstorm WatchSPCKittson, Marshall, Pennington, Polk, Red Lake, Roseau10 hr
Jul 17, 5:39 PM CDTSevere Thunderstorm Watch PDSSPCAitkin, Becker, Beltrami, Benton, Big Stone, Carlton and 29 more8 hr
Jul 17, 6:04 PM CDTMesoscale DiscussionSPCKittson, Marshall, Pennington, Polk, Red Lake, Roseau116 min
Jul 17, 12:10 PM CDTMesoscale DiscussionSPCBottineau, Burleigh, Dunn, Grant, Hettinger, McHenry and 14 more95 min
Jul 17, 2:25 PM CDTMesoscale DiscussionSPCBenson, Cavalier, Eddy, McHenry, McLean, Nelson and 7 more95 min
Jul 17, 3:47 PM CDTMesoscale DiscussionSPCGrant, Hettinger, McLean, Mercer, Morton, Oliver88 min

Nearby

Mesoscale Discussions in Minnesota, 2020Mesoscale Discussions in North Dakota, 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.