Alert archive / Minnesota / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 114, NWS Duluth, MN

July 21, 2016Koochiching County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 21, 2016, 12:09 AM CDT for Koochiching County, Minnesota. It was in force for 66 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 21, 2016, 12:09 AM CDT (05:09 UTC)
Expired
Jul 21, 2016, 1:15 AM CDT
In force
66 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Koochiching County, MN

The radar

The Duluth radar (KDLH), 196 km from the middle of the area, began a volume at 05:11 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 00:00Z, 5.2 hours before the alert went out and 51 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 00:00Z on 2016-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2808 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 00:00Z on 2016-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
2808 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
915 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

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 20, 7:11 PM CDT, 4 hours 58 minutes earlier.

Area forecast discussion, Jul 20, 7:11 PM CDT, 4 hours 58 minutes before
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Hazardous weather outlook, Jul 20, 3:47 PM CDT, 8 hours 22 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
347 PM CDT WED JUL 20 2016

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-211300-
KOOCHICHING-NORTH ST. LOUIS-NORTHERN COOK/NORTHERN LAKE-
NORTH ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/NORTH SHORE-
SOUTHERN COOK/NORTH SHORE-NORTH CASS-SOUTH ITASCA-SOUTH CASS-
CROW WING-NORTHERN AITKIN-SOUTH AITKIN-CARLTON/SOUTH ST. LOUIS-
PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON-BURNETT-WASHBURN-SAWYER-PRICE-
347 PM CDT WED JUL 20 2016

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

DANGEROUSLY HOT CONDITIONS WILL CONTINUE ACROSS MUCH OF THE
NORTHLAND OVERNIGHT. HIGH HUMIDITY VALUES AND OVERNIGHT LOW
TEMPERATURES IN THE UPPER 60S TO UPPER 70S WILL PROVIDE LITTLE
RELIEF. PLEASE REFER TO THE LATEST HEAT ADVISORY PRODUCTS FOR
ADDITIONAL DETAILS.

THUNDERSTORMS ARE EXPECTED TO DEVELOP IN WESTERN NORTH DAKOTA THIS
AFTERNOON AND ADVANCE EASTWARD INTO THE NORTHLAND LATE TONIGHT.
SOME OF THE STORMS MAY BE SEVERE WITH DAMAGING WINDS AND HEAVY
RAINFALL THE GREATEST THREATS. THE MOST VIGOROUS STORMS WILL BE
CAPABLE OF PRODUCING LARGE HAIL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

IT WILL BE HOT AND HUMID ONCE AGAIN ON THURSDAY. TEMPERATURES ARE
EXPECTED TO CLIMB WELL INTO THE 80S AND LOW 90S WITH HEAT INDEX
VALUES FROM 95 TO 105 EXPECTED. PLEASE REFER TO THE LATEST HEAT
ADVISORY PRODUCTS FOR ADDITIONAL DETAILS.

THERE IS A CHANCE STRONG TO POSSIBLY SEVERE THUNDERSTORMS FROM THE
OVERNIGHT PERIOD WILL LINGER INTO THURSDAY MORNING. THE GREATEST
THREAT FROM THESE STORMS WILL BE TORRENTIAL RAINFALL AND DAMAGING
WIND GUSTS. A FEW OF THE MORE VIGOROUS STORMS WOULD SUPPORT LARGE
HAIL.

STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE AGAIN SATURDAY
AND SATURDAY NIGHT. THE MAIN THREAT WILL ONCE AGAIN BE DAMAGING
WINDS AND TORRENTIAL RAINFALL...WITH A SECONDARY THREAT OF LARGE
HAIL.

ADDITIONAL THUNDERSTORM CHANCES RETURN MONDAY NIGHT THROUGH THE
MIDDLE OF NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS MAY BE NEEDED LATE TONIGHT AND EARLY THURSDAY
MORNING.

LSZ121-140>148-211300-
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-
347 PM CDT WED JUL 20 2016

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS LATE OVERNIGHT OVER WESTERN
LAKE SUPERIOR. SOME OF THE STORMS MAY BE STRONG TO SEVERE WITH
WIND GUSTS GREATER THAN 30 KNOTS...FREQUENT CLOUD TO WATER
LIGHTNING...LARGE HAIL...AND TORRENTIAL RAINFALL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SEVERAL ROUNDS OF THUNDERSTORMS WILL AFFECT WESTERN LAKE SUPERIOR
THROUGH THE PERIOD. THE STRONGEST STORMS WILL BE CAPABLE OF
PRODUCING BRIEF GUSTY WINDS TO 30 KNOTS...SMALL HAIL...FREQUENT
CLOUD TO WATER LIGHTNING...AND HEAVY RAINFALL.

HUYCK

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

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 1:03 AM CDTSevere Thunderstorm WarningDLHCass, Itasca57 min
Jul 21, 1:13 AM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis62 min
Jul 21, 1:34 AM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing41 min
Jul 21, 2:01 AM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Itasca, Koochiching, Saint Louis59 min
Jul 21, 2:14 AM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Crow Wing, Pine61 min
Jul 21, 2:17 AM CDTSevere Thunderstorm WarningDLHLake, Saint Louis58 min
Jul 21, 3:00 AM CDTSevere Thunderstorm WarningDLHCarlton, Saint Louis60 min
Jul 21, 3:05 AM CDTSpecial Weather StatementDLHCarlton, Pine40 min
Jul 21, 3:11 AM CDTSpecial Marine WarningDLH34 min
Jul 21, 3:13 AM CDTSpecial Marine WarningDLH47 min
Jul 21, 3:14 AM CDTSevere Thunderstorm WarningDLHCook, Lake46 min
Jul 21, 3:37 AM CDTSpecial Marine WarningDLH38 min
Jul 21, 3:41 AM CDTSevere Thunderstorm WarningDLHLake, Saint Louis46 min
Jul 21, 3:50 AM CDTSevere Thunderstorm WarningDLHCarlton, Pine40 min
Jul 21, 3:53 AM CDTSevere Thunderstorm WarningDLHSaint Louis18 min
Jul 21, 3:56 AM CDTSpecial Marine WarningDLH49 min
Jul 21, 3:59 AM CDTSevere Thunderstorm WarningDLHCook61 min
Jul 21, 4:11 AM CDTSpecial Marine WarningDLH49 min
Jul 21, 4:45 AM CDTSpecial Marine WarningDLH30 min
Jul 21, 4:53 AM CDTSpecial Marine WarningDLH37 min
Jul 21, 4:05 AM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Douglas55 min
Jul 21, 4:32 AM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Burnett, Douglas, Sawyer, Washburn43 min
Jul 21, 4:41 AM CDTSevere Thunderstorm WarningDLHAshland, Iron49 min
Jul 21, 4:57 AM CDTSevere Thunderstorm WarningDLHAshland, Iron, Price, Sawyer63 min
Jul 21, 6:03 AM CDTSpecial Weather StatementDLHPrice12 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2016Every severe thunderstorm warning in 2016

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.