Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 202, NWS Duluth, MN

August 19, 2011Burnett County, Douglas County, Washburn County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Aug 19, 2011, 5:51 AM CDT for Burnett County, Douglas County, Washburn County, Wisconsin. It was in force for 39 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 19, 2011, 5:51 AM CDT (10:51 UTC)
Expired: Aug 19, 2011, 6:30 AM CDT
In force: 39 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Burnett County, WI, Douglas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 86 km from the middle of the area, began a volume at 10:55 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

Minneapolis, MN (KMPX), launched 00:00Z, 10.9 hours before the alert went out and 184 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 876 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1385 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.9

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 19, 3:46 AM CDT, 2 hours 5 minutes earlier.

Area forecast discussion, Aug 19, 3:46 AM CDT, 2 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
346 AM CDT FRI AUG 19 2011

.DISCUSSION...SFC COLD FRONT... WITH MDT/STRONG FRONTOGENESIS IN
SFC/85H LAYER.. IS PUSHING INTO NWRN CORNER OF STATE EARLY THIS
MORNING. SIGNIFICANT AXIS OF MUCAPE AVAILABLE AHEAD OF FRNTL BDRY
WITH LINE OF BROKEN STORMS HAVING MERGED INTO AN MCS OVER WCTRL
CWA. NUMEROUS REPORTS OF WIND DMG/HAIL ASSOCIATED WITH SYSTEM
WEST OF CWA AND EXPECT THAT TO CONTINUE.

TODAY...MCS SHOULD WORKS ITS WAY EAST TOWARDS TWIN PORTS BY
9/10Z...THEN SOUTHEAST INTO NWRN WISC FOLLOWING MORE SIGNIFICANT MSTR
TRANSPORT AXIS. FRONTAL BDRY WILL MAKE ITS WAY INTO ERN WISC ZONES
BY 18Z..AND WELL EAST OF CWA BY 00Z. ADDITIONAL HAIL/WIND DMG
EXPECTED THROUGH AT LEAST EARLY MORNING. BEHIND FRONT...DEEPENING
UNIDIRECTIONAL NW WIND AND INCREASING PGF SHOULD PROMOTE GUSTY
WINDS. SOME LOW POPS NEAR NRN TIER OF MN ZONES THIS AFTN AS LAPSE
RATES STEEPEN DUE TO LOWERING HEIGHTS HOWEVER CONFIDENCE NOT THAT
GREAT AS DEEP LYR RH DECREASES MARKEDLY.

TONIGHT/TOMORROW...SFC HIGH BUILDS INTO REGION AS UPPER TROF
AMPLIFIES OVERHEAD. MIGRATORY WEAK SHORTWAVE TROFS ARE EXPECTED TO
BE EMBEDDED WITHIN THE CYCLONICALLY CURVED FLOW ALOFT. ALTHOUGH
SOME MOISTENING OF ATMOSPHERE DEVELOPS WILL HOLD DRY FCST FOR NOW.
MAY NEED TO ADD POPS LATE AFTN EARLY EVENING SATURDAY AS MULTI MDL
CONSENSUS SUGGESTS SOME LIGHT QPF.

EXTENDED...SATURDAY NIGHT THROUGH TUESDAY...
NO SIGNIFICANT CHANGES MADE TO INHERITED FCST AS SYNOPTIC PATTERN
YIELDS LOW CONFIDENCE. BRISK MID LVL NWRLY FLOW WILL DOMINATE
THROUGH MONDAY BEFORE BRIEF RIDGING/FLATTENING OF FLOW DEVELOPS
ALOFT. INSTABILITY RW ARE POSSIBLE LATE SAT/SUNDAY ACROSS NRN/ERN
CWA UNDERNEATH MORE CYCLONIC FLOW SFC/ALOFT. AS SFC HIGH MOVES
EAST OF REGION EARLY MONDAY...A PERIOD OF WEAK ISENTROPIC ASCENT WILL
OCCUR AND CONTINUE INTO TUESDAY. DIFFICULTY ARISES IN DETERMINING
IF ENOUGH LIFT/SATURATION ACTUALLY OCCURS IN THIS WARM ADVECTION
REGIME TO CAUSE PRECIP...OR JUST GENERATE CLOUDS. EXISTING DRY
GRIDS WILL BE MAINTAINED UNTIL BETTER CONFIDENCE IS GAINED. NEXT
ORGANIZED AREA OF FORCING/PRECIP OCCURS WITH UPPER TROF/FRNTAL
SYSTEM. AGAIN ENOUGH DIFFERENCE IN TIMING TO KEEP FCST AS IS.

.AVIATION...06Z TAF ISSUANCE...
A COLD FRONT WILL SWEEP EAST OVER THE REGION THROUGH THE TAF
PERIOD. ALTHOUGH VFR CONDITIONS WILL PREVAIL...AN AREA OF SHOWERS
AND THUNDERSTORMS WILL BE FOUND WITH THE FRONTAL PASSAGE. CONDITIONS
WILL BRIEFLY REDUCE TO MVFR/IFR FOR A PERIOD WITH ANY STORMS THAT
DEVELOP. VARIABLE WIND GUSTS AROUND 40 KT WILL ALSO BE POSSIBLE
WITH ANY STORMS. SHORT TERM MODELS ARE SUGGESTING A FEW HOUR
PERIOD OF LOW CEILINGS AROUND 1500 FT EARLY THIS MORNING NEAR/BEHIND
THE FRONT. WINDS WILL TURN INTO THE NORTHWEST AND BECOME GUSTY ON
FRIDAY AS THE FRONT DEPARTS TO THE EAST. LINGERING STORMS AND
AREAS OF MVFR/IFR WILL BE FOUND OVER WISCONSIN...INCLUDING THE
KHYR AREA...INTO LATE MORNING.

.POINT TEMPS/POPS...
DLH  74  56  72  52 /  20  10  10  10
INL  73  44  74  47 /  20  10  10  20
BRD  76  57  74  54 /  10  10  10  10
HYR  77  52  75  49 /  40  10  10  10
ASX  78  56  74  53 /  40  10  10  10

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
LS...NONE.
&&

Hazardous weather outlook, Aug 19, 5:21 AM CDT, 30 minutes before

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In the hours before

Local storm report, Aug 19, 4:16 AM CDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
416 AM CDT FRI AUG 19 2011

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

0225 AM     TSTM WND DMG     CASS LAKE               47.40N 94.54W
08/19/2011                   CASS               MN   LAW ENFORCEMENT

            EASTWARD EXTENSION OF WIND DAMAGE PATH FROM BELTRAMI
            COUNTY ALONG ROOSEVELT RD.

&&

HLUCHAN

Special weather statement, Aug 19, 4:37 AM CDT, 1 hour 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
437 AM CDT FRI AUG 19 2011

MNZ010>012-019-191000-
CENTRAL ST. LOUIS-KOOCHICHING-NORTH ST. LOUIS-NORTHERN COOK/NORTHERN
LAKE-
437 AM CDT FRI AUG 19 2011

...STRONG THUNDERSTORMS MOVING ACROSS THE BORDERLAND...

AT 432 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM RAY TO BABBITT...
MOVING EAST AT 35 MPH.

THESE STORMS ARE CAPABLE OF PRODUCING HALF INCH DIAMETER HAIL...WIND
GUSTS UP TO 50 MPH...OCCASIONAL CLOUD TO GROUND LIGHTNING...BRIEF
HEAVY DOWNPOURS...

* THUNDERSTORMS WILL BE NEAR...
  BUYCK BY 445 AM...
  ROBINSON BY 450 AM...
  CRANE LAKE AND ELY BY 500 AM...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS
TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE
PASSED.

LAT...LON 4863 9307 4860 9306 4862 9296 4857 9289
      4854 9264 4850 9262 4846 9271 4845 9250
      4824 9237 4825 9229 4834 9230 4836 9222
      4766 9141 4751 9217 4853 9365 4855 9348
      4859 9348 4862 9341 4865 9322

HLUCHAN

Special weather statement, Aug 19, 4:57 AM CDT, 54 minutes before

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Special weather statement, Aug 19, 4:59 AM CDT, 52 minutes before

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Special weather statement, Aug 19, 5:33 AM CDT, 18 minutes before

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Special weather statement, Aug 19, 5:46 AM CDT, 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 1:21 AM CDT	Special Weather Statement	DLH	Cass, Crow Wing, Itasca	24 min
Aug 19, 1:33 AM CDT	Special Weather Statement	DLH	Cook	12 min
Aug 19, 1:48 AM CDT	Severe Thunderstorm Warning	DLH	Cass, Itasca	57 min
Aug 19, 2:08 AM CDT	Special Weather Statement	DLH	Cook	22 min
Aug 19, 2:33 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Itasca	42 min
Aug 19, 3:14 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Carlton, Cass, Itasca, Saint Louis	61 min
Aug 19, 3:52 AM CDT	Special Weather Statement	DLH	Carlton	23 min
Aug 19, 3:56 AM CDT	Special Marine Warning	DLH		94 min
Aug 19, 4:09 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Carlton, Lake, Pine, Saint Louis	51 min
Aug 19, 4:37 AM CDT	Special Weather Statement	DLH		23 min
Aug 19, 4:48 AM CDT	Severe Thunderstorm Warning	DLH	Koochiching, Saint Louis	42 min
Aug 19, 4:57 AM CDT	Special Weather Statement	DLH	Lake	33 min
Aug 19, 5:46 AM CDT	Special Weather Statement	DLH	Cook	29 min
Aug 19, 6:09 AM CDT	Special Marine Warning	DLH		39 min
Aug 19, 4:59 AM CDT	Special Weather Statement	DLH	Douglas	31 min
Aug 19, 5:33 AM CDT	Special Weather Statement	DLH	Ashland, Bayfield, Douglas	27 min
Aug 19, 6:28 AM CDT	Severe Thunderstorm Warning	DLH	Sawyer, Washburn	32 min
Aug 19, 6:59 AM CDT	Special Weather Statement	DLH	Iron, Price, Sawyer	31 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011 Every 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.