Alert archive / Wisconsin / Mesoscale Discussions in 2014

Mesoscale Discussion 1672

September 3, 2014Chisago County, Minnesota; 11 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 3, 2014, 8:00 PM CDT for Chisago County, Minnesota; 11 counties in Wisconsin. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Sep 3, 2014, 8:00 PM CDT (01:00 UTC)
Expired: Sep 3, 2014, 9:30 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Chisago County, MN, Barron County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Taylor County, WI

The radar

The Minneapolis radar (KMPX), 147 km from the middle of the area, began a volume at 01:02 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 watches that followed

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

Severe Thunderstorm Watch 491Sep 3, 8:25 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.0 hours before the alert went out and 149 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: 2049 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 892 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 337 m²/s²
Significant tornado parameter: 3.4
Supercell composite: 14.3

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
Sep 3, 10:41 PM CDT	Mesoscale Discussion	SPC	Houston, Winona	79 min
Sep 4, 1:17 AM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Grant, Mahnomen, Norman and 4 more	88 min
Sep 4, 1:48 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 4 more	5 hr
Sep 4, 4:43 AM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Chisago, Clay, Crow Wing, Isanti and 8 more	2 hr
Sep 4, 5:02 AM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 7 more	5 hr
Sep 4, 7:21 AM CDT	Mesoscale Discussion	SPC	Aitkin, Crow Wing, Kanabec, Mille Lacs, Pine	114 min
Sep 4, 5:04 PM CDT	Mesoscale Discussion	SPC	Houston, Winona	86 min
Sep 3, 8:22 PM CDT	Severe Thunderstorm Watch	SPC	Barron, Chippewa, Clark, Dunn, Eau Claire, Polk and 5 more	3 hr
Sep 4, 7:42 AM CDT	Severe Thunderstorm Watch	SPC	Ashland, Bayfield, Florence, Forest, Iron, Langlade and 10 more	4 hr
Sep 4, 10:25 AM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Clark, Florence, Forest, Kewaunee and 18 more	65 min

Nearby

Mesoscale Discussions in Wisconsin, 2014 Mesoscale Discussions in Minnesota, 2014 Every mesoscale discussion in 2014

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.