Alert archive / Minnesota / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 201, NWS Duluth, MN

July 29, 2008Aitkin County, Carlton County, Pine County, Minnesota; Burnett County, Douglas County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Jul 29, 2008, 3:48 AM CDT for Aitkin County, Carlton County, Pine County, Minnesota; Burnett County, Douglas County, Wisconsin. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 29, 2008, 3:48 AM CDT (08:48 UTC)
Expired
Jul 29, 2008, 4:45 AM CDT
In force
57 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon

Counties Aitkin County, MN, Carlton County, MN, Pine County, MN, Burnett County, WI, Douglas County, WI

The radar

The Duluth radar (KDLH), 65 km from the middle of the area, began a volume at 08:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 29, 12:56 AM CDTSevere Thunderstorm WatchSPC5 hr
Jul 29, 3:13 AM CDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.8 hours before the alert went out and 181 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 2008-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1538 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 2008-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939Sfc1 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
1538 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1238 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.7

Open this sounding in Storm Lab

The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 2:43 AM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing, Itasca62 min
Jul 29, 3:48 AM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Cass, Itasca, Koochiching, Saint Louis57 min
Jul 29, 4:02 AM CDTSpecial Marine WarningDLH2 hr
Jul 29, 9:02 AM CDTSevere Thunderstorm WarningDLHPrice52 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2008Severe Thunderstorm Warnings in Wisconsin, 2008Every severe thunderstorm warning in 2008

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.