Alert archive / Minnesota / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 28, NWS Duluth, MN

April 18, 2004Saint Louis County, Minnesota; Douglas County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Apr 18, 2004, 5:13 PM CDT for Saint Louis County, Minnesota; Douglas County, Wisconsin. It was in force for 32 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: Apr 18, 2004, 5:13 PM CDT (22:13 UTC)
Expired: Apr 18, 2004, 5:45 PM CDT
In force: 32 min
Issued by: NWS Duluth, MN
Area: Counties, with a storm outline in the text

Counties Saint Louis County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 21 km from the middle of the area, began a volume at 22:16 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.

Issued	Product	Office	Lasted
Apr 18, 1:40 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 10.2 hours before the alert went out and 191 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1153 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 254 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 Apr 18, 3:05 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Apr 18, 3:05 PM CDT, 2 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
305 PM CDT SUN APR 18 2004

.DISCUSSION...MAIN FOCUS IS ON SEVERE WEATHER POTENTIAL LATE THIS
AFTERNOON AND THIS EVENING.

SEVERE WEATHER HAS BEEN PROMINENT DURING THE DAY...WITH DAMAGING
WINDS INITIALLY, AND UP TO 2 INCH HAIL WITH THE LATER STORMS.
SUPERCELLS DEVELOPED IN THE LAST 3 HOURS OF THE EVENT, WITH ROTATION
EVIDENT IN MANY OF THE STORMS. NOT A GOOD VORTICITY GENERATION
POTENTIAL (VGP) SIGNAL, SO STORM RELATIVE HELICITY WAS NOT
EFFICIENTLY INGESTED INTO THE STORMS FROM THE SURFACE. THIS MIGHT
HAVE KEPT THE CIRCULATIONS FROM BECOMING SURFACE BASED.

AS FOR THE NEXT STAGE OF THE EVENT, THE CONVECTIVE INITIATION HAS
ALREADY BEGUN ACROSS CENTRAL AND SOUTHERN MN. SHEAR PROFILES, AND
INSTABILITY PARAMETERS ARE INDICATING THE STRONG POTENTIAL FOR
SUPERCELL THUNDERSTORMS THIS AFTERNOON AND EVENING, WITH TORNADOES A
STRONG THREAT. A TORNADO WATCH HAS BEEN ISSUED THROUGH 8 PM FOR MOST
OF THE CWA. THE STORM PREDICTION CENTER (SPC) DISCUSSED THE STRONG
MARINE LAYER NORTH OF THE ADVANCING WARM FRONT, AND THAT IT MAY
REDUCE THE CHANCES OF TORNADOES FARTHER INTO THE ARROWHEAD...BUT THE
TORNADO THREAT REMAINS EVERYWHERE, NONE THE LESS. THIS IMPENDING
SEVERE WEATHER EVENT IS BEING HIGHLIGHTED AS A PARTICULARLY
DANGEROUS SITUATION (PDS), BY THE SPC. STORM WILL CONTINUE
OVERNIGHT...AS THE LOW PRESSURE MOVES RAPIDLY NORTHEAST ALONG THE
WARM FRONT INTO NORTHWEST WISCONSIN BY THIS EVENING...AND ALL THE
WAY NORTH OF LAKE SUPERIOR BY MIDNIGHT. HEAVY RAINS ARE LIKELY WITH
THE STRONGEST STORMS...ALONG WITH HAIL, DAMAGING WINDS, AND
TORNADOES. RAINFALL TOTALS UP TO 2 INCHES ARE POSSIBLE. AREAS OF
DENSE FOG ARE POSSIBLE MONDAY MORNING DUE TO THE ABUNDANT SURFACE
MOISTURE FROM THIS SYSTEM.

POST FRONTAL PRECIPITATION WILL CONTINUE INTO MONDAY MORNING BEFORE
A STRONG SUBSIDENCE REGION AND HIGH PRESSURE SHUT THINGS DOWN.
CLEARING SKIES ARE EXPECTED MONDAY AFTERNOON. THE NEXT SYSTEM TO
BRING PRECIP WILL HOLD OFF UNTIL TUESDAY NIGHT...AS LOW PRESSURE
LIFTS INTO SOUTHERN MINNESOTA.

&&

.DLH...WATCHES/WARNINGS/ADVISORIES

MN...TORNADO WATCH UNTIL 8 PM FOR AREAS SOUTH AND EAST OF A LINE
FROM WALKER TO GRAND MARAIS.
WI...TORNADO WATCH UNTIL 8 PM FOR ALL OF NW WIS.

SHIMON

Hazardous weather outlook, Apr 18, 7:30 AM CDT, 9 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
730 AM CDT SUN APR 18 2004

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-191230-
ASHLAND-BAYFIELD-BURNETT-C. ST. LOUIS-CROW WING-DOUGLAS-IRON-
KOOCHICHING-N. AITKIN-N. CASS-N. ITASCA-N. LAKE/N. COOK-N. ST. LOUIS-
PINE-PRICE-S. AITKIN-S. CASS-S. COOK/LAKESHORE-S. ITASCA-
S. LAKE/LAKESHORE-S. ST. LOUIS/CARLTON-SAWYER-WASHBURN-
730 AM CDT SUN APR 18 2004

...MODERATE RISK OF SEVERE STORMS TODAY AND TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEASTERN MINNESOTA AND
NORTHWESTERN WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

A SIGNIFICANT SEVERE WEATHER OUTBREAK IS SHAPING UP FOR MUCH OF THE
NORTHLAND TODAY AND TONIGHT. THE BEST CHANCE OF SEVERE WEATHER WILL
BE ACROSS EAST CENTRAL MINNESOTA AND NORTHWESTERN WISCONSIN. GOLF
BALL SIZE HAIL OR LARGER...DAMAGING WINDS IN EXCESS OF 60 MPH AND
TORRENTIAL DOWNPOURS ARE EXPECTED WITH SOME OF THE STORMS. OF
GREATEST CONCERN TODAY WILL BE THE THREAT OF TORNADOES. ALL THE
FORECAST PARAMETERS INDICATE THAT THERE IS A GOOD POSSIBILITY OF
TORNADOES...ESPECIALLY THIS AFTERNOON AND EVENING. BE SURE TO
MONITOR FOR POSSIBLE WATCHES AND WARNINGS AS THIS SEVERE WEATHER
EVENT UNFOLDS. ASIDE FROM THE SEVERE WEATHER...A SMALL CRAFT ADVISORY
IS IN EFFECT FOR THE NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION IS POSSIBLE AT ANY POINT TODAY...BUT
IT IS LIKELY THIS AFTERNOON AND EVENING.

&&

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING URL:

HTTP://WWW.CRH.NOAA.GOV/DLH

DAP

In the hours before

Local storm report, Apr 18, 4:14 PM CDT, 59 minutes before

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Local storm report, Apr 18, 4:31 PM CDT, 42 minutes before

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Local storm report, Apr 18, 4:40 PM CDT, 33 minutes before

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Local storm report, Apr 18, 4:57 PM CDT, 16 minutes before

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Local storm report, Apr 18, 5:02 PM CDT, 11 minutes before

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Local storm report, Apr 18, 5:03 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
503 PM CDT SUN APR 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0411 PM     HAIL             3 S DANBURY             45.96N 92.37W
04/18/2004  1.00 INCH        BURNETT            WI   TRAINED SPOTTER

&&

EOM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 2:20 AM CDT	Severe Thunderstorm Warning	DLH	Pine	55 min
Apr 18, 3:17 AM CDT	Severe Thunderstorm Warning	DLH	Pine	58 min
Apr 18, 7:18 AM CDT	Severe Thunderstorm Warning	DLH	Pine	27 min
Apr 18, 8:01 AM CDT	Severe Thunderstorm Warning	DLH	Cass	44 min
Apr 18, 8:39 AM CDT	Severe Thunderstorm Warning	DLH	Cass, Crow Wing	51 min
Apr 18, 8:42 AM CDT	Severe Thunderstorm Warning	DLH	Itasca	33 min
Apr 18, 9:47 AM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	28 min
Apr 18, 10:07 AM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	38 min
Apr 18, 10:33 AM CDT	Severe Thunderstorm Warning	DLH	Lake	42 min
Apr 18, 11:06 AM CDT	Special Marine Warning	DLH		54 min
Apr 18, 12:13 PM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	62 min
Apr 18, 12:58 PM CDT	Severe Thunderstorm Warning	DLH	Lake	62 min
Apr 18, 1:35 PM CDT	Severe Thunderstorm Warning	DLH	Cook	55 min
Apr 18, 3:36 PM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	39 min
Apr 18, 3:59 PM CDT	Tornado Warning	DLH	Pine	61 min
Apr 18, 4:13 PM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	62 min
Apr 18, 4:30 PM CDT	Special Marine Warning	DLH		60 min
Apr 18, 5:31 PM CDT	Special Marine Warning	DLH		89 min
Apr 18, 5:31 PM CDT	Special Marine Warning	DLH		89 min
Apr 18, 5:53 PM CDT	Severe Thunderstorm Warning	DLH	Lake	52 min
Apr 18, 2:11 AM CDT	Severe Thunderstorm Warning	DLH	Sawyer	64 min
Apr 18, 3:37 AM CDT	Severe Thunderstorm Warning	DLH	Burnett, Douglas, Washburn	53 min
Apr 18, 4:00 AM CDT	Severe Thunderstorm Warning	DLH	Bayfield	30 min
Apr 18, 4:43 AM CDT	Severe Thunderstorm Warning	DLH	Sawyer	32 min
Apr 18, 4:56 AM CDT	Severe Thunderstorm Warning	DLH	Douglas, Washburn	34 min
Apr 18, 5:20 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Sawyer	55 min
Apr 18, 7:33 AM CDT	Severe Thunderstorm Warning	DLH	Washburn	27 min
Apr 18, 7:56 AM CDT	Severe Thunderstorm Warning	DLH	Sawyer	34 min
Apr 18, 8:27 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Sawyer	48 min
Apr 18, 9:10 AM CDT	Severe Thunderstorm Warning	DLH	Price	35 min
Apr 18, 4:41 PM CDT	Tornado Warning	DLH	Burnett	64 min
Apr 18, 5:23 PM CDT	Tornado Warning	DLH	Washburn	67 min
Apr 18, 5:54 PM CDT	Tornado Warning	DLH	Sawyer	66 min
Apr 18, 6:32 PM CDT	Severe Thunderstorm Warning	DLH	Ashland	43 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2004 Severe Thunderstorm Warnings in Wisconsin, 2004 Every severe thunderstorm warning 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.