Alert archive / Minnesota / Special Weather Statements in 2017

Special Weather Statement, NWS Duluth, MN

July 18, 2017Itasca County, Minnesota

NWS Duluth, MN issued this special weather statement at Jul 18, 2017, 3:13 AM CDT for Itasca County, Minnesota. 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 outline as issued.

The facts

Issued
Jul 18, 2017, 3:13 AM CDT (08:13 UTC)
Expired
Jul 18, 2017, 3:45 AM CDT
In force
32 min
Issued by
NWS Duluth, MN

County Itasca County, MN

The radar

The Duluth radar (KDLH), 130 km from the middle of the area, began a volume at 08:13 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, 8.2 hours before the alert went out and 87 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 2017-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 946 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 2017-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
946 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1268 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 18, 12:06 AM CDT, 3 hours 7 minutes earlier.

Area forecast discussion, Jul 18, 12:06 AM CDT, 3 hours 7 minutes before
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Hazardous weather outlook, Jul 17, 3:43 PM CDT, 11 hours 30 minutes before
Hazardous Weather Outlook
National Weather Service Duluth MN
343 PM CDT Mon Jul 17 2017

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-181245-
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-
343 PM CDT Mon Jul 17 2017

This Hazardous Weather Outlook is for portions of northeast
Minnesota and northwest Wisconsin.

.DAY ONE...This afternoon and Tonight

Strong to severe thunderstorms are expected to develop across
north-central Minnesota later this afternoon and track eastward
into northeast Minnesota towards this evening. The strongest
storms will be capable of producing large hail and damaging winds,
with a small chance of a tornado. A Severe Thunderstorm Watch has
been issued for all of north-central and northeast Minnesota, as
well as portions of northwest Wisconsin for this afternoon and
evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Another round of strong to severe thunderstorms are expected
Tuesday, mainly for east central Minnesota into northwest
Wisconsin.

Thunderstorms are possible from central Minnesota to northwest
Wisconsin Wednesday afternoon through Thursday morning.

Thunderstorms are possible across northeast Minnesota and
northwest Wisconsin Friday afternoon, and again Saturday
afternoon through Saturday night.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotters will be needed this afternoon into this evening
across much of north-central and northeast Minnesota and portions
of northwest Wisconsin. Please report hail of any size, damaging
winds, and heavy rainfall amounts.

LSZ121-140>148-181245-
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-
343 PM CDT Mon Jul 17 2017

This Hazardous Weather Outlook is for portions of the Nearshore
waters of western Lake Superior.

.DAY ONE...This afternoon and Tonight

Strong to severe thunderstorms will be possible over the western
Lake Superior nearshore waters later this evening and overnight.
Some storms may cause damaging winds, large hail, cloud-to-water
lightning, and heavy downpours.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms will be possible during the day Tuesday.

Another chance of thunderstorms will be possible Saturday
afternoon through Sunday morning.

JTS

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, 2:06 AM CDT, 1 hour 7 minutes before
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Special weather statement, Jul 18, 2:14 AM CDT, 59 minutes before
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Special weather statement, Jul 18, 2:29 AM CDT, 44 minutes before
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Special weather statement, Jul 18, 2:47 AM CDT, 26 minutes before
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Special weather statement, Jul 18, 3:12 AM CDT, 1 minute before
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Special weather statement, Jul 18, 3:13 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:11 PM CDTTornado WarningDLHSaint Louis34 min
Jul 17, 7:17 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine43 min
Jul 17, 7:23 PM CDTSevere Thunderstorm WarningDLHSaint Louis37 min
Jul 17, 7:30 PM CDTSevere Thunderstorm WarningDLHSaint Louis30 min
Jul 17, 7:39 PM CDTSevere Thunderstorm WarningDLHPine51 min
Jul 17, 7:47 PM CDTSpecial Weather StatementDLHSaint Louis13 min
Jul 17, 7:56 PM CDTSevere Thunderstorm WarningDLHPine49 min
Jul 17, 8:02 PM CDTSpecial Weather StatementDLHSaint Louis28 min
Jul 17, 8:10 PM CDTSpecial Weather StatementDLHSaint Louis20 min
Jul 17, 8:38 PM CDTSpecial Weather StatementDLHLake22 min
Jul 17, 9:27 PM CDTSpecial Weather StatementDLHItasca33 min
Jul 17, 9:52 PM CDTSpecial Weather StatementDLHItasca38 min
Jul 18, 1:54 AM CDTSpecial Weather StatementDLHKoochiching21 min
Jul 18, 2:06 AM CDTSpecial Weather StatementDLHItasca24 min
Jul 18, 2:14 AM CDTSpecial Weather StatementDLHKoochiching16 min
Jul 18, 2:29 AM CDTSpecial Weather StatementDLHItasca16 min
Jul 18, 2:47 AM CDTSpecial Weather StatementDLHItasca28 min
Jul 18, 3:12 AM CDTSpecial Weather StatementDLHItasca33 min
Jul 18, 10:20 AM CDTSpecial Weather StatementDLHCrow Wing25 min
Jul 18, 11:02 AM CDTSpecial Weather StatementDLHAitkin28 min
Jul 18, 11:17 AM CDTSpecial Weather StatementDLHCarlton28 min
Jul 17, 8:36 PM CDTSpecial Weather StatementDLHBurnett, Washburn24 min
Jul 17, 8:52 PM CDTSpecial Weather StatementDLHBayfield23 min
Jul 17, 9:04 PM CDTSpecial Weather StatementDLHWashburn26 min
Jul 17, 9:14 PM CDTSpecial Weather StatementDLHAshland31 min
Jul 17, 9:46 PM CDTSpecial Weather StatementDLHAshland29 min
Jul 18, 11:00 AM CDTSpecial Weather StatementDLHSawyer15 min
Jul 18, 11:23 AM CDTSpecial Weather StatementDLHPrice37 min

Nearby

Special Weather Statements in Minnesota, 2017Every special weather statement in 2017

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.