Alert archive / Michigan / Mesoscale Discussions in 2007

Mesoscale Discussion 1732

August 12, 200724 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2007, 4:23 AM EDT for 24 counties in Michigan. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Aug 12, 2007, 4:23 AM EDT (08:23 UTC)
Expired
Aug 12, 2007, 5:30 AM EDT
In force
67 min
Issued by
the Storm Prediction Center
All 24 counties

Allegan County, MI, Barry County, MI, Calhoun County, MI, Cass County, MI, Clare County, MI, Eaton County, MI, Gladwin County, MI, Gratiot County, MI, Ionia County, MI, Isabella County, MI, Kalamazoo County, MI, Kalkaska County, MI, Kent County, MI, Lake County, MI, Mecosta County, MI, Missaukee County, MI, Montcalm County, MI, Newaygo County, MI, Osceola County, MI, Ottawa County, MI, Roscommon County, MI, Saint Joseph County, MI, Van Buren County, MI, Wexford County, MI

The radar

The Grand Rapids radar (KGRR), 26 km from the middle of the area, began a volume at 08:26 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 8.4 hours before the alert went out and 245 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, Green Bay/Straub, WI at 00:00Z on 2007-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 261 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, Green Bay/Straub, WI at 00:00Z on 2007-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 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
261 J/kg
Mixed-layer CIN
-375 J/kg
Mixed-layer LCL
1182 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
141 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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Nearby

Mesoscale Discussions in Michigan, 2007Every mesoscale discussion in 2007

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.