Alert archive / Minnesota / Mesoscale Discussions in 2014

Mesoscale Discussion 1676

September 4, 201414 counties in Minnesota; 4 counties in North Dakota; 6 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2014, 4:43 AM CDT for 14 counties in Minnesota; 4 counties in North Dakota; 6 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 4, 2014, 4:43 AM CDT (09:43 UTC)
Expired
Sep 4, 2014, 6:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 24 counties

Aitkin County, MN, Becker County, MN, Chisago County, MN, Clay County, MN, Crow Wing County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Todd County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Barron County, WI, Burnett County, WI, Polk County, WI, Rusk County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Minneapolis radar (KMPX), 173 km from the middle of the area, began a volume at 09:46 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, 9.7 hours before the alert went out and 172 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 2014-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2049 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 2014-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 243 square meters per square second.19395878Sfc1 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
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.

IssuedProductOfficeCountiesLasted
Sep 3, 8:00 PM CDTMesoscale DiscussionSPCChisago90 min
Sep 3, 10:41 PM CDTMesoscale DiscussionSPCHouston, Winona79 min
Sep 4, 1:17 AM CDTMesoscale DiscussionSPCBecker, Clay, Douglas, Grant, Mahnomen, Norman and 4 more88 min
Sep 4, 1:48 AM CDTSevere Thunderstorm WatchSPCBecker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 4 more5 hr
Sep 4, 5:02 AM CDTSevere Thunderstorm WatchSPCAitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 7 more5 hr
Sep 4, 7:21 AM CDTMesoscale DiscussionSPCAitkin, Crow Wing, Kanabec, Mille Lacs, Pine114 min
Sep 4, 5:04 PM CDTMesoscale DiscussionSPCHouston, Winona86 min
Sep 3, 7:01 PM CDTSevere Thunderstorm WatchSPCBillings, Bottineau, Burke, Burleigh, Divide, Dunn and 17 more7 hr
Sep 3, 8:54 PM CDTMesoscale DiscussionSPCBillings, Bottineau, Burke, Burleigh, Divide, Dunn and 17 more96 min
Sep 3, 8:22 PM CDTSevere Thunderstorm WatchSPCBarron, Chippewa, Clark, Dunn, Eau Claire, Polk and 5 more3 hr
Sep 4, 7:42 AM CDTSevere Thunderstorm WatchSPCAshland, Bayfield, Florence, Forest, Iron, Langlade and 10 more4 hr
Sep 4, 10:25 AM CDTMesoscale DiscussionSPCBrown, Calumet, Clark, Florence, Forest, Kewaunee and 18 more65 min

Nearby

Mesoscale Discussions in Minnesota, 2014Mesoscale Discussions in Wisconsin, 2014Mesoscale Discussions in North Dakota, 2014Every 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.