Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 2311

November 9, 20114 counties in Michigan; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Nov 9, 2011, 11:50 AM EST for 4 counties in Michigan; 10 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Nov 9, 2011, 11:50 AM EST (16:50 UTC)
Expired
Nov 9, 2011, 4:15 PM EST
In force
4 hr
Issued by
the Storm Prediction Center

Counties Delta County, MI, Dickinson County, MI, Iron County, MI, Menominee County, MI, Florence County, WI, Forest County, WI, Langlade County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI, Waupaca County, WI, Winnebago County, WI

The radar

The Marquette radar (KMQT), 110 km from the middle of the area, began a volume at 16:52 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 nearest sounding before it

Alpena, MI (KAPX), launched 12:00Z, 4.8 hours before the alert went out and 426 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, Alpena, MI at 12:00Z on 2011-11-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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, Alpena, MI at 12:00Z on 2011-11-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 square meters per square second.1939587897117Sfc1 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
424 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
291 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.

IssuedProductOfficeCountiesLasted
Nov 9, 5:41 AM ESTMesoscale DiscussionSPCAdams, Clark, Crawford, Forest, Grant, Jackson and 18 more4 hr

Nearby

Mesoscale Discussions in Wisconsin, 2011Mesoscale Discussions in Michigan, 2011Every mesoscale discussion in 2011

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.