Alert archive / Minnesota / Mesoscale Discussions in 2004

Mesoscale Discussion 487

April 28, 200411 counties in Minnesota; Douglas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2004, 6:01 PM CDT for 11 counties in Minnesota; Douglas County, Wisconsin. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 28, 2004, 6:01 PM CDT (23:01 UTC)
Expired
Apr 28, 2004, 7:30 PM CDT
In force
89 min
Issued by
the Storm Prediction Center

Counties Aitkin County, MN, Benton County, MN, Carlton County, MN, Crow Wing County, MN, Kanabec County, MN, Lake County, MN, Mille Lacs County, MN, Morrison County, MN, Pine County, MN, Saint Louis County, MN, Todd County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 50 km from the middle of the area, began a volume at 23:03 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

International Fa, MN (KINL), launched 12:00Z, 11.0 hours before the alert went out and 169 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, International Fa, MN at 12:00Z on 2004-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, International Fa, MN at 12:00Z on 2004-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1339 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
356 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
Apr 28, 2:35 PM CDTMesoscale DiscussionSPCAitkin, Benton, Carlton, Cass, Crow Wing, Douglas and 13 more85 min
Apr 28, 3:25 PM CDTSevere Thunderstorm WatchSPCAitkin, Carlton, Cass, Crow Wing, Hubbard, Itasca and 5 more6 hr

Nearby

Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in Wisconsin, 2004Every mesoscale discussion in 2004

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.