Alert archive / Minnesota / Mesoscale Discussions in 2005

Mesoscale Discussion 938

May 20, 20059 counties in Minnesota; 5 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at May 20, 2005, 5:23 PM CDT for 9 counties in Minnesota; 5 counties in North Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 20, 2005, 5:23 PM CDT (22:23 UTC)
Expired: May 20, 2005, 7:00 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Becker County, MN, Clay County, MN, Clearwater County, MN, Mahnomen County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 66 km from the middle of the area, began a volume at 22:24 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.

Severe Thunderstorm Watch 305May 20, 6:10 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.4 hours before the alert went out and 290 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1627 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 1:39 PM CDT	Mesoscale Discussion	SPC	Clay, Kittson, Marshall, Norman, Pennington, Polk and 2 more	2 hr
May 20, 5:55 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Clearwater, Mahnomen, Norman, Pennington and 3 more	65 min
May 20, 6:10 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Mahnomen, Norman, Otter Tail, Polk and 2 more	8 hr

Nearby

Mesoscale Discussions in Minnesota, 2005 Mesoscale Discussions in North Dakota, 2005 Every mesoscale discussion in 2005

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.