Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 128, NWS Duluth, MN

July 16, 2011Itasca County, Koochiching County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 16, 2011, 2:19 PM CDT for Itasca County, Koochiching County, Minnesota. It was in force for 56 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 16, 2011, 2:19 PM CDT (19:19 UTC)
Expired
Jul 16, 2011, 3:15 PM CDT
In force
56 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Itasca County, MN, Koochiching County, MN

The radar

The Duluth radar (KDLH), 162 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 83 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 2011-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1350 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, International Fa, MN at 12:00Z on 2011-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
1350 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
563 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

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 16, 1:37 PM CDT, 42 minutes earlier.

Area forecast discussion, Jul 16, 1:37 PM CDT, 42 minutes before
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Hazardous weather outlook, Jul 16, 4:08 AM CDT, 10 hours 11 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
408 AM CDT SAT JUL 16 2011

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-171030-
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-
408 AM CDT SAT JUL 16 2011

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WILL BE POSSIBLE OVER PORTIONS OF THE NORTHLAND
TODAY AND TONIGHT. THE STORMS MAY BE SEVERE TONIGHT OVER FAR
NORTHERN MINNESOTA WITH LARGE HAIL...DAMAGING WINDS AND HEAVY RAIN
THE MAIN THREATS.

HOT AND HUMID CONDITIONS WILL OCCUR OVER A GOOD PORTION OF THE
NORTHLAND TODAY...WITH THE HIGHEST HEAT INDICES OVER PORTIONS OF
NORTHWEST WISCONSIN BACK INTO THE BRAINERD LAKES...AND NORTH TO
INTERNATIONAL FALLS. VARIOUS HEAT ADVISORIES AND EXCESSIVE HEAT
WARNINGS ARE IN EFFECT. SEE THE LATEST WEATHER MESSAGE FOR FURTHER
INFORMATION.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SEVERE STORMS WILL BE POSSIBLE OVER MUCH OF THE NORTHLAND SUNDAY
INTO SUNDAY NIGHT. LARGE HAIL...DAMAGING WINDS AND HEAVY RAIN WILL
BE THE MAIN THREATS. A TORNADO IS ALSO POSSIBLE SUNDAY AFTERNOON
AND EVENING.

MORE THUNDERSTORMS ARE POSSIBLE PERIODICALLY FROM MONDAY THROUGH
NEXT FRIDAY. IT'S TOO EARLY TO DETERMINE WHAT PERIOD WILL SEE
SEVERE STORMS...BUT SOME STORMS WILL BE SEVERE DUE TO THE
EXCESSIVE HEAT AND HUMIDITY.

VERY HOT AND HUMID CONDITIONS WILL CONTINUE THROUGH AT LEAST THE
MIDDLE OF NEXT WEEK OVER MUCH OF THE NORTHLAND WITH HIGHS IN THE
UPPER EIGHTIES TO MIDDLE NINETIES AND HIGH HUMIDITY. VARIOUS
EXCESSIVE HEAT WATCHES...WARNINGS AND ADVISORIES ARE IN EFFECT.
SEE THE LATEST WEATHER MESSAGE FOR FURTHER INFORMATION.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED TONIGHT...AND MAINLY OVER
FAR NORTHERN MINNESOTA.

LSZ121-140>148-171030-
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-
408 AM CDT SAT JUL 16 2011

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE POSSIBLE OVER LAKE SUPERIOR. SOME SEVERE STORMS
ARE POSSIBLE TONIGHT.

FOG WILL BE POSSIBLE THIS MORNING...SOME LOCALLY DENSE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS WILL BE POSSIBLE PERIODICALLY THROUGH THE
PERIOD...WITH SOME SEVERE.

MELDE

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 16, 8:42 AM CDT, 5 hours 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
842 AM CDT SAT JUL 16 2011

WIZ009-161615-
PRICE-
INCLUDING THE CITY OF...PHILLIPS
842 AM CDT SAT JUL 16 2011

...HEAVY RAIN WILL CONTINUE TO FALL FROM PHILLIPS ON SOUTH...

HEAVY RAIN...FROM NEARBY THUNDERSTORMS...WILL CONTINUE TO FALL
ACROSS THE SOUTHERN HALF OF PRICE COUNTY...FROM PHILLIPS SOUTH
LATE THIS MORNING. RAINFALLS WILL GENERALLY BE A HALF INCH AN
HOUR...WITH A FEW AREAS BRIEFLY RECEIVING UP TO AN INCH OF
RAINFALL AN HOUR.  ONE OR TWO CLAPS OF THUNDER MAY BE HEARD.

EOM
Special weather statement, Jul 16, 1:22 PM CDT, 57 minutes before
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Special weather statement, Jul 16, 1:55 PM CDT, 24 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 3:46 AM CDTHeat AdvisoryDLHCarlton, Cook, Itasca, Koochiching, Lake, Saint Louis5 days
Jul 16, 1:55 PM CDTSpecial Weather StatementDLHKoochiching65 min
Jul 16, 3:09 PM CDTSpecial Weather StatementDLHKoochiching66 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning in 2011

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.