Alert archive / Minnesota / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 112, NWS Duluth, MN

July 9, 2008Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 9, 2008, 4:33 PM CDT for Saint Louis County, Minnesota. It was in force for 42 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 9, 2008, 4:33 PM CDT (21:33 UTC)
Expired
Jul 9, 2008, 5:15 PM CDT
In force
42 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon

County Saint Louis County, MN

The radar

The Duluth radar (KDLH), 86 km from the middle of the area, began a volume at 21:32 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, 9.6 hours before the alert went out and 126 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 2008-07-09Temperature 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 2008-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
970 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 9, 3:22 PM CDT, 1 hour 11 minutes earlier.

Area forecast discussion, Jul 9, 3:22 PM CDT, 1 hour 11 minutes before
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Hazardous weather outlook, Jul 9, 3:37 PM CDT, 56 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DULUTH MN
337 PM CDT WED JUL 9 2008

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-101030-
KOOCHICHING-NORTHERN ST. LOUIS-NORTHERN COOK/NORTHERN LAKE-
NORTHERN ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/LAKESHORE-
SOUTHERN COOK/LAKESHORE-NORTHERN CASS-SOUTHERN ITASCA-
SOUTHERN CASS-CROW WING-NORTHERN AITKIN-SOUTHERN AITKIN-
CARLTON/SOUTHERN ST. LOUIS-PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON-
BURNETT-WASHBURN-SAWYER-PRICE-
337 PM CDT WED JUL 9 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND
NORTHWEST WISCONSIN.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL OCCUR THIS AFTERNOON OVER THE
INTERNATIONAL BORDER REGION AND MOVE TOWARDS THE RANGE BY EARLY
EVENING. SOME STORMS MAY PRODUCE GUSTY WINDS AND HAIL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF THE NORTHLAND
THURSDAY THROUGH FRIDAY NIGHT. THERE IS A SLIGHT RISK THAT SOME
THUNDERSTORMS MAY BE SEVERE THURSDAY THROUGH FRIDAY NIGHT...WITH
LARGE HAIL AND DAMAGING WINDS.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED THURSDAY AND/OR FRIDAY.

LSZ121-140>148-101030-
BAYFIELD TO OAK POINT WI-GRAND PORTAGE TO GRAND MARAIS MN-
GRAND MARAIS TO TACONITE HARBOR MN-
TACONITE HARBOR TO SILVER BAY HARBOR MN-
SILVER BAY HARBOR TO TWO HARBORS MN-TWO HARBORS TO DULUTH MN-
DULUTH MN TO PORT WING WI-PORT WING TO SAND ISLAND WI-
SAND ISLAND TO BAYFIELD WI-OAK POINT TO SAXON HARBOR WI-
337 PM CDT WED JUL 9 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF
WESTERN LAKE SUPERIOR.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS THROUGH WEDNESDAY EVENING ACROSS
MOST OF NORTHWESTERN LAKE SUPERIOR....GENERALLY NORTH OF TWO HARBORS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF WESTERN LAKE
SUPERIOR THURSDAY THROUGH EARLY SATURDAY. THERE IS A SLIGHT RISK THAT
SOME THUNDERSTORMS MAY BE SEVERE THURSDAY THROUGH FRIDAY
NIGHT...WITH LARGE HAIL AND DAMAGING WINDS.

CANNON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 5:03 PM CDTSevere Thunderstorm WarningDLHItasca, Koochiching42 min
Jul 9, 5:12 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis48 min
Jul 9, 5:17 PM CDTSevere Thunderstorm WarningDLHItasca, Koochiching, Saint Louis43 min
Jul 9, 5:20 PM CDTTornado WarningDLHLake, Saint Louis40 min
Jul 9, 5:46 PM CDTSevere Thunderstorm WarningDLHItasca, Koochiching44 min
Jul 9, 6:00 PM CDTSevere Thunderstorm WarningDLHLake30 min
Jul 9, 6:01 PM CDTSpecial Marine WarningDLH59 min
Jul 9, 6:31 PM CDTSevere Thunderstorm WarningDLHItasca, Saint Louis29 min
Jul 9, 6:31 PM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis59 min
Jul 9, 6:58 PM CDTSpecial Marine WarningDLH53 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.