Alert archive / Minnesota / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 47, NWS Duluth, MN

July 18, 2013Cook County, Lake County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 18, 2013, 2:36 PM CDT for Cook County, Lake County, Minnesota. It was in force for 24 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 18, 2013, 2:36 PM CDT (19:36 UTC)
Expired
Jul 18, 2013, 3:00 PM CDT
In force
24 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Cook County, MN, Lake County, MN

The radar

The Duluth radar (KDLH), 131 km from the middle of the area, began a volume at 19:36 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.6 hours before the alert went out and 418 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, Green Bay/Straub, WI at 12:00Z on 2013-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 802 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2013-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.1939Sfc1 km3 km6 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
802 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1214 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.4

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 18, 1:04 PM CDT, 1 hour 32 minutes earlier.

Area forecast discussion, Jul 18, 1:04 PM CDT, 1 hour 32 minutes before
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Hazardous weather outlook, Jul 18, 12:30 PM CDT, 2 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DULUTH MN
1230 PM CDT THU JUL 18 2013

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-191030-
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-
1230 PM CDT THU JUL 18 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

WIDESPREAD SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP LATE THIS
AFTERNOON...ROUGHLY BETWEEN 3 PM AND 5 PM...ACROSS NORTH CENTRAL AND
NORTHWEST MINNESOTA...AND MOVE RAPIDLY EAST-SOUTHEASTWARD ACROSS
MUCH OF NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN THROUGH THIS
EVENING.  WIDESPREAD DAMAGING WINDS WILL BE THE PRIMARY THREAT WITH
THESE STORMS...ALTHOUGH A FEW OF THE STRONGEST STORMS COULD ALSO
PRODUCE GOLF BALL SIZE HAIL. WIND GUSTS UP TO 75 MPH WILL BE
POSSIBLE WITH THE LINE OF STORMS AS IT MOVE ACROSS MUCH OF THE
REGION THIS EVENING.  IN ADDITION...LOCALLY HEAVY RAINFALL IS ALSO
POSSIBLE AS VERY MOIST AIR CONTRIBUTES TO HIGH RAINFALL RATES.
PLEASE MONITOR THE LATEST FORECAST FOR POTENTIAL SEVERE THUNDERSTORM
WATCHES AND WARNINGS THAT MAY BE ISSUED LATER THIS AFTERNOON AND
TONIGHT.

HEAT INDICES WILL REACH THE MID 90S THIS AFTERNOON ALONG A
CORRIDOR FROM BRAINERD TO HINCKLEY TO PHILLIPS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THUNDERSTORMS ARE POSSIBLE EARLY FRIDAY OVER NORTHWEST WISCONSIN.

THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS LATE SATURDAY SOUTH OF
THE TWIN PORTS....AND OVER MOST OF THE NORTHLAND SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL BE REQUIRED LATER THIS AFTERNOON AND
INTO TONIGHT.

LSZ121-140>148-191030-
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-
1230 PM CDT THU JUL 18 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO REDEVELOP OVER MUCH
OF WESTERN LAKE SUPERIOR LATE THIS AFTERNOON AND OVERNIGHT. NEARLY
CONTINUOUS LIGHTNING...STRONG WINDS...LOCALLY HIGHER WAVE HEIGHTS UP
TO 8 FEET AND LARGE HAIL ARE ALL POSSIBLE BETWEEN ROUGHLY 5 PM AND
MIDNIGHT.  ANY MARINERS WITH PLANS TO VENTURE OUT ON LAKE SUPERIOR
THIS AFTERNOON OR EVENING SHOULD STAY CURRENT WITH THE LATEST
WEATHER INFORMATION AND HAVE A PLAN TO REACH SAFE HARBOR QUICKLY AND
ON SHORT NOTICE.  MARINERS IN SMALL CRAFT MAY WANT TO CONSIDER
DELAYING OR CHANGING PLANS TO VENTURE OUT ALTOGETHER.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SCATTERED THUNDERSTORMS ARE EXPECTED FRIDAY MORNING.

ISOLATED THUNDERSTORMS MAY DEVELOP SUNDAY.

 MILLER

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS:
HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)

In the hours before

Special weather statement, Jul 18, 1:04 PM CDT, 1 hour 32 minutes before
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Special weather statement, Jul 18, 1:09 PM CDT, 1 hour 27 minutes before
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Special weather statement, Jul 18, 1:21 PM CDT, 1 hour 15 minutes before
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Special weather statement, Jul 18, 1:55 PM CDT, 41 minutes before
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Special weather statement, Jul 18, 2:00 PM CDT, 36 minutes before
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Special weather statement, Jul 18, 2:28 PM CDT, 8 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:15 PM CDTSpecial Weather StatementDLHLake30 min
Jul 17, 8:36 PM CDTSpecial Weather StatementDLHItasca39 min
Jul 17, 8:46 PM CDTSpecial Weather StatementDLHLake29 min
Jul 18, 12:33 AM CDTSpecial Weather StatementDLHCook27 min
Jul 18, 7:11 AM CDTAreal Flood AdvisoryDLHKoochiching, Saint Louis4 hr
Jul 18, 8:50 AM CDTSpecial Weather StatementDLH25 min
Jul 18, 9:19 AM CDTSpecial Weather StatementDLH16 min
Jul 18, 9:37 AM CDTSpecial Weather StatementDLH18 min
Jul 18, 9:54 AM CDTSevere Thunderstorm WarningDLHLake, Saint Louis21 min
Jul 18, 10:47 AM CDTSpecial Weather StatementDLH18 min
Jul 18, 11:10 AM CDTSpecial Weather StatementDLHCook20 min
Jul 18, 12:50 PM CDTSpecial Weather StatementDLH25 min
Jul 18, 1:04 PM CDTSpecial Weather StatementDLH26 min
Jul 18, 1:09 PM CDTSpecial Weather StatementDLHLake21 min
Jul 18, 1:21 PM CDTSpecial Weather StatementDLHLake24 min
Jul 18, 1:26 PM CDTSevere Thunderstorm WarningDLHLake49 min
Jul 18, 1:55 PM CDTSpecial Weather StatementDLHCook20 min
Jul 18, 2:00 PM CDTSpecial Weather StatementDLHLake15 min
Jul 18, 2:07 PM CDTSpecial Marine WarningDLH53 min
Jul 18, 2:28 PM CDTSpecial Weather StatementDLHCook22 min
Jul 18, 2:54 PM CDTSpecial Marine WarningDLH51 min
Jul 18, 3:06 PM CDTSpecial Weather StatementDLHLake24 min
Jul 18, 3:45 PM CDTSpecial Marine WarningDLH30 min
Jul 18, 4:26 PM CDTSpecial Weather StatementDLHLake4 min
Jul 18, 4:41 PM CDTSpecial Weather StatementDLHKoochiching19 min
Jul 18, 4:52 PM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis23 min
Jul 18, 4:57 PM CDTSpecial Weather StatementDLHKoochiching18 min
Jul 18, 4:59 PM CDTSpecial Weather StatementDLH16 min
Jul 18, 5:06 PM CDTSpecial Weather StatementDLHKoochiching24 min
Jul 18, 5:11 PM CDTSpecial Marine WarningDLH49 min
Jul 18, 5:14 PM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis46 min
Jul 18, 5:22 PM CDTSpecial Weather StatementDLH8 min
Jul 18, 5:34 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis41 min
Jul 18, 5:52 PM CDTSpecial Weather StatementDLHCook23 min
Jul 18, 5:59 PM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis46 min
Jul 18, 6:07 PM CDTSpecial Weather StatementDLH23 min
Jul 18, 6:14 PM CDTSpecial Weather StatementDLHKoochiching16 min
Jul 18, 6:24 PM CDTSevere Thunderstorm WarningDLHCook, Lake51 min
Jul 18, 6:44 PM CDTSpecial Weather StatementDLHSaint Louis16 min
Jul 18, 6:49 PM CDTSpecial Weather StatementDLHCook26 min
Jul 18, 6:58 PM CDTSpecial Weather StatementDLHSaint Louis17 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2013Every severe thunderstorm warning in 2013

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.