Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 77, NWS Duluth, MN

August 8, 2015Cass County, Itasca County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Aug 8, 2015, 2:09 PM CDT for Cass County, Itasca County, Minnesota. It was in force for 36 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
Aug 8, 2015, 2:09 PM CDT (19:09 UTC)
Expired
Aug 8, 2015, 2:45 PM CDT
In force
36 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Cass County, MN, Itasca County, MN

The radar

The Duluth radar (KDLH), 141 km from the middle of the area, began a volume at 19:10 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, 7.2 hours before the alert went out and 157 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 2015-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 452 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 2015-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.1939587897Sfc1 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
452 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
982 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
183 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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 Aug 8, 12:29 PM CDT, 1 hour 40 minutes earlier.

Area forecast discussion, Aug 8, 12:29 PM CDT, 1 hour 40 minutes before
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Hazardous weather outlook, Aug 8, 12:49 PM CDT, 1 hour 20 minutes before
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In the hours before

Local storm report, Aug 8, 8:51 AM CDT, 5 hours 18 minutes before
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Special weather statement, Aug 8, 9:43 AM CDT, 4 hours 26 minutes before
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Special weather statement, Aug 8, 10:11 AM CDT, 3 hours 58 minutes before
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Special weather statement, Aug 8, 10:29 AM CDT, 3 hours 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
1029 AM CDT SAT AUG 8 2015

MNZ018-026-081545-
NORTH ITASCA-SOUTH ITASCA-
1029 AM CDT SAT AUG 8 2015

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL ITASCA COUNTY...

AT 1029 AM CDT...A STRONG THUNDERSTORM WAS NEAR TACONITE...OR 7 MILES
NORTHWEST OF HILL ANNEX MINE STATE PARK...MOVING EAST AT 25 MPH.

WIND GUSTS UP TO 35 MPH...DIME SIZE HAIL...HEAVY DOWNPOURS...AND
OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THIS STORM.

THIS STORM WILL BE NEAR...
  KEEWATIN AND NASHWAUK AROUND 1045 AM CDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE LAWRENCE LAKE AND BUCK
LAKE.

SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL
THIS STORM PASSES.

IF YOU ARE ON OR NEAR ONE OF THE MANY AREA LAKES...GET OFF OF THE
WATER IMMEDIATELY AND SEEK SHELTER ON SHORE INSIDE A STURDY BUILDING.

LAT...LON 4734 9347 4749 9349 4757 9307 4735 9307
TIME...MOT...LOC 1529Z 262DEG 23KT 4741 9337

MOORE
Local storm report, Aug 8, 1:55 PM CDT, 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
155 PM CDT SAT AUG 08 2015

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

0153 PM     HEAVY RAIN       6 ENE HACKENSACK        46.96N 94.41W
08/08/2015  M2.07 INCH       CASS               MN   TRAINED SPOTTER

            TOTAL FOR TODAY. 0.23 INCHES FELL THIS MORNING.

&&

KLH
Local storm report, Aug 8, 2:05 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
205 PM CDT SAT AUG 08 2015

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

0202 PM     HAIL             2 WSW LONGVILLE         46.98N 94.25W
08/08/2015  E0.25 INCH       CASS               MN   TRAINED SPOTTER

&&

KLH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 8:40 PM CDTDense Fog AdvisoryDLHCarlton, Cook, Lake, Pine, Saint Louis13 hr
Aug 7, 9:18 PM CDTSpecial Weather StatementDLHKoochiching87 min
Aug 7, 10:12 PM CDTSpecial Weather StatementDLHKoochiching33 min
Aug 7, 10:42 PM CDTSpecial Weather StatementDLHKoochiching18 min
Aug 7, 11:01 PM CDTSpecial Weather StatementDLHKoochiching14 min
Aug 7, 11:20 PM CDTSpecial Weather StatementDLHKoochiching25 min
Aug 7, 11:48 PM CDTSpecial Weather StatementDLHKoochiching12 min
Aug 8, 12:03 AM CDTSpecial Weather StatementDLHKoochiching27 min
Aug 8, 12:28 AM CDTSpecial Weather StatementDLHKoochiching32 min
Aug 8, 1:08 AM CDTSpecial Weather StatementDLHSaint Louis37 min
Aug 8, 1:12 AM CDTSpecial Weather StatementDLHItasca33 min
Aug 8, 1:45 AM CDTSpecial Weather StatementDLHItasca30 min
Aug 8, 2:00 AM CDTSpecial Weather StatementDLHCass30 min
Aug 8, 2:11 AM CDTSpecial Weather StatementDLHItasca34 min
Aug 8, 2:28 AM CDTSpecial Weather StatementDLHCass32 min
Aug 8, 2:53 AM CDTSpecial Weather StatementDLHItasca37 min
Aug 8, 4:57 AM CDTSpecial Weather StatementDLHWadena33 min
Aug 8, 5:33 AM CDTSpecial Weather StatementDLHCrow Wing27 min
Aug 8, 5:57 AM CDTSpecial Weather StatementDLHCrow Wing33 min
Aug 8, 6:38 AM CDTSpecial Weather StatementDLHCrow Wing22 min
Aug 8, 6:57 AM CDTSevere Thunderstorm WarningDLHAitkin, Crow Wing18 min
Aug 8, 7:20 AM CDTSpecial Weather StatementDLHCrow Wing25 min
Aug 8, 7:44 AM CDTSpecial Weather StatementDLHCrow Wing31 min
Aug 8, 9:43 AM CDTSpecial Weather StatementDLHItasca17 min
Aug 8, 10:11 AM CDTSpecial Weather StatementDLHItasca19 min
Aug 8, 10:29 AM CDTSpecial Weather StatementDLHItasca16 min
Aug 8, 10:37 AM CDTSevere Thunderstorm WarningDLHItasca, Saint Louis23 min
Aug 8, 2:27 PM CDTSpecial Weather StatementDLHCass33 min
Aug 8, 2:51 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing24 min
Aug 8, 2:56 PM CDTSevere Thunderstorm WarningDLHItasca34 min
Aug 8, 3:16 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing29 min
Aug 8, 3:21 PM CDTSevere Thunderstorm WarningDLHSaint Louis24 min
Aug 8, 3:34 PM CDTSevere Thunderstorm WarningDLHCrow Wing26 min
Aug 8, 3:46 PM CDTSevere Thunderstorm WarningDLHAitkin29 min
Aug 8, 3:50 PM CDTSevere Thunderstorm WarningDLHSaint Louis25 min
Aug 8, 4:06 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis24 min
Aug 8, 4:11 PM CDTSevere Thunderstorm WarningDLHSaint Louis19 min
Aug 8, 4:16 PM CDTSpecial Weather StatementDLHAitkin29 min
Aug 8, 4:24 PM CDTTornado WarningDLHSaint Louis36 min
Aug 8, 4:29 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis31 min
Aug 8, 4:46 PM CDTSpecial Weather StatementDLHCarlton29 min
Aug 8, 4:53 PM CDTAreal Flood AdvisoryDLHLake, Saint Louis3 hr
Aug 8, 4:58 PM CDTSevere Thunderstorm WarningDLHLake32 min
Aug 8, 5:03 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton27 min
Aug 8, 5:29 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine31 min
Aug 8, 5:36 PM CDTAreal Flood AdvisoryDLHAitkin, Cass, Crow Wing5 hr
Aug 8, 5:50 PM CDTSpecial Weather StatementDLHAitkin10 min
Aug 8, 5:58 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine47 min
Aug 8, 6:06 PM CDTSpecial Weather StatementDLHAitkin24 min
Aug 8, 6:34 PM CDTSpecial Weather StatementDLHAitkin26 min
Aug 8, 6:48 PM CDTSpecial Weather StatementDLHCook27 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2015Every severe thunderstorm warning in 2015

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.