Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 182, NWS Duluth, MN

September 24, 2007Carlton County, Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Sep 24, 2007, 4:34 PM CDT for Carlton County, Saint Louis County, Minnesota. It was in force for 41 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
Sep 24, 2007, 4:34 PM CDT (21:34 UTC)
Expired
Sep 24, 2007, 5:15 PM CDT
In force
41 min
Issued by
NWS Duluth, MN
Area
Counties, with a storm outline in the text

Counties Carlton County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 39 km from the middle of the area, began a volume at 21:36 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

Minneapolis, MN (KMPX), launched 12:00Z, 9.6 hours before the alert went out and 262 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 2007-09-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 176 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 2007-09-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
176 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
90 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 Sep 24, 3:26 PM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Sep 24, 3:26 PM CDT, 1 hour 8 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
326 PM CDT MON SEP 24 2007

.DISCUSSION...A BROKEN LINE OF SHOWERS AND THUNDERSTORMS HAS
DEVELOPED ALONG A COLD FRONT...AND CONTINUES TO PROGRESS EWRD
ACROSS MINNESOTA THIS AFTERNOON. FARTHER EAST...SCATTERED TO
ISOLATED SHOWERS AND STORMS HAVE DEVELOPED AS WELL AHEAD OF THE
FRONT. THIS ACTIVITY SHOULD CONTINUE TO INCREASE IN COVERAGE
ACROSS OUR CWA LATE THIS AFTERNOON AND EARLY THIS EVENING...AS THE
FRONT MOVES OVER OUR CWA PROVIDING MORE LIFT. BOTH THE GFS AND NAM
HAVE COME INTO BETTER AGREEMENT WITH THEIR PRECIP FIELDS...SHOWING
THE HEAVIEST PRECIP AMOUNTS FALLING THIS AFTERNOON AND EVENING ACROSS
THE MN PORTION OF OUR CWA AND OUR WRN WI ZONES. PREVIOUS MODEL
RUNS...ESPECIALLY FROM THE NAM PRODUCED THE HEAVIEST PRECIP ACROSS
NWRN WI THIS EVENING. THE HIGHEST RISK FOR SEVERE
THUNDERSTORMS...WHICH IS SLIGHT...WILL BE ACROSS OUR SRN ZONES
THROUGH THIS EVENING AS OUTLINED IN SWODY1.

BY EARLY TUESDAY MORNING...THE FRONT WILL REACH THE ERN BORDER OF
OUR CWA...THEN MOVE OVER ERN WI AND UPPER MICHIGAN TUESDAY
AFTERNOON. EVEN WITH CAA OCCURRING ACROSS OUR CWA...AN UPPER LEVEL
SHORTWAVE WILL TAP RESIDUAL LOW-LEVEL MOISTURE TO PRODUCE
SCATTERED SHOWERS ACROSS MUCH OF OUR FCST AREA LATE TONIGHT AND
TUESDAY MORNING. DRIER AIR WILL ADVECT EAST ACROSS THE NORTHLAND
TOMORROW AFTERNOON AND NIGHT...ENDING MOST IF NOT ALL OF THE
SHOWER ACTIVITY. A SECOND WEAK DISTURBANCE WILL FOLLOW ON
WEDNESDAY...WHICH COULD PRODUCE SCATTERED PRECIP ACROSS THE
NORTHLAND WEDNESDAY AND WEDNESDAY NIGHT.

AFTER MUCH ABOVE TO MUCH ABOVE NORMAL TEMPS TODAY...READINGS WILL
TUMBLE DOWN INTO THE UPPER 50S AND LOWER 60S FOR HIGHS TUESDAY AND
WEDNESDAY.

&&

.AVIATION...A COLD FRONT WILL PUSH FROM WEST TO EAST ACROSS
NORTHEAST MINNESOTA THIS EVENING...AND ACROSS NORTHWEST
WISCONSIN OVERNIGHT. NUMEROUS SHOWERS AND THUNDERSTORMS ARE
EXPECTED TO ALONG AND AHEAD OF THIS FRONT. WIDESPREAD MVFR
CONDITIONS ARE EXPECTED TO PERSIST TONIGHT WITH AREAS OF IFR
CONDITIONS IN SHOWERS AND THUNDERSTORMS. WINDS WILL SWITCH TO THE
NORTHWEST BEHIND THE COLD FRONT TONIGHT. SOME POST FRONTAL SHOWERS
WILL BE POSSIBLE TUESDAY MORNING...MOVING FROM WEST TO EAST ACROSS
THE NORTHLAND.

&&

POINT TEMPS/POPS...
DLH  50  57  37  62 /  80  20  10  30
INL  44  55  35  62 /  60  20  10  30
BRD  50  58  38  65 /  50  10  10  30
HYR  54  60  35  64 /  90  30  10  20
ASX  55  61  39  63 /  80  40  20  20

&&

.DLH WATCHES/WARNINGS/ADVISORIES...

MN...NONE.
WI...NONE.
LS...NONE.

BERDES/LILES
Hazardous weather outlook, Sep 24, 3:45 AM CDT, 12 hours 49 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
345 AM CDT MON SEP 24 2007

LSZ121-140>148-162-MNZ010>012-018>021-025-026-033>038-WIZ001>004-
006>009-251030-
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-
OPEN WATERS OF LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI
TO GRAND PORTAGE MN-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-
345 AM CDT MON SEP 24 2007

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WILL BECOME NUMEROUS ACROSS THE NORTHLAND TODAY...
AND WILL CONTINUE INTO TONIGHT AS WELL. WHILE THE SLIGHT RISK OF
SEVERE THUNDERSTORMS IS JUST SOUTHWEST OF OUR AREA...AN ISOLATED
SEVERE THUNDERSTORM IS POSSIBLE THIS AFTERNOON AND EVENING. THE
MAIN THREAT WOULD BE HIGH WINDS AND POSSIBLY SOME LARGE HAIL.
LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE...AND WILL BE CLOSELY
MONITORED DUE TO THE HEAVY RAIN THAT HAS RECENTLY FALLEN.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS A CHANCE OF THUNDERSTORMS TUESDAY NIGHT INTO THURSDAY
MORNING...AND AGAIN FROM FRIDAY NIGHT THROUGH SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT.

DAP

In the hours before

Local storm report, Sep 24, 4:24 PM CDT, 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 24, 3:56 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Saint Louis49 min
Sep 24, 5:12 PM CDTSevere Thunderstorm WarningDLHSaint Louis48 min
Sep 24, 5:16 PM CDTSpecial Marine WarningDLH59 min
Sep 24, 5:21 PM CDTSpecial Marine WarningDLH39 min
Sep 24, 6:13 PM CDTSpecial Marine WarningDLH62 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2007Every severe thunderstorm warning 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.