Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1522

July 18, 200710 counties in Minnesota; 12 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2007, 3:42 PM CDT for 10 counties in Minnesota; 12 counties in Wisconsin. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Jul 18, 2007, 3:42 PM CDT (20:42 UTC)
Expired
Jul 18, 2007, 4:45 PM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 22 counties

Anoka County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Olmsted County, MN, Ramsey County, MN, Scott County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 106 km from the middle of the area, began a volume at 20:42 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 12:00Z, 8.7 hours before the alert went out and 143 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 12:00Z on 2007-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1891 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 12:00Z on 2007-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -61 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
1891 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
641 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-61 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
-0.2
Supercell composite
-1.6

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
Jul 17, 9:31 PM CDTSevere Thunderstorm WatchSPCDodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more6 hr
Jul 17, 11:24 PM CDTMesoscale DiscussionSPCFaribault, Freeborn, Jackson, Martin, Mower, Nobles and 1 more96 min
Jul 18, 3:35 AM CDTMesoscale DiscussionSPCDodge, Fillmore, Houston, Mower, Olmsted, Steele and 1 more85 min
Jul 18, 12:17 PM CDTMesoscale DiscussionSPCAnoka, Chisago, Isanti, Ramsey, Washington118 min
Jul 18, 12:47 PM CDTMesoscale DiscussionSPCBlue Earth, Cottonwood, Faribault, Fillmore, Freeborn, Houston and 10 more2 hr
Jul 18, 2:09 PM CDTSevere Thunderstorm WatchSPCFaribault, Freeborn, Jackson, Martin, Mower, Nobles and 1 more4 hr
Jul 18, 3:59 PM CDTSevere Thunderstorm WatchSPCAnoka, Carver, Dakota, Dodge, Fillmore, Goodhue and 14 more5 hr
Jul 18, 4:59 PM CDTMesoscale DiscussionSPCFillmore, Houston91 min
Jul 18, 6:44 PM CDTMesoscale DiscussionSPCHouston, Winona2 hr
Jul 18, 1:37 PM CDTSevere Thunderstorm WatchSPCBrown, Calumet, Dodge, Door, Fond du Lac, Green Lake and 18 more7 hr
Jul 18, 5:35 PM CDTSevere Thunderstorm WatchSPCGrant, Green, Lafayette, Rock6 hr
Jul 18, 5:46 PM CDTMesoscale DiscussionSPCBrown, Calumet, Dodge, Fond du Lac, Green Lake, Manitowoc and 11 more119 min
Jul 18, 6:38 PM CDTMesoscale DiscussionSPCKenosha97 min
Jul 18, 6:50 PM CDTMesoscale DiscussionSPCGrant, Green, Lafayette85 min

Nearby

Mesoscale Discussions in Wisconsin, 2007Mesoscale Discussions in Minnesota, 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.