Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 40, NWS Duluth, MN

May 23, 2007Douglas County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at May 23, 2007, 3:53 PM CDT for Douglas County, Wisconsin. It was in force for 37 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: May 23, 2007, 3:53 PM CDT (20:53 UTC)
Expired: May 23, 2007, 4:30 PM CDT
In force: 37 min
Issued by: NWS Duluth, MN
Area: Counties, with a storm outline in the text

County Douglas County, WI

The radar

The Duluth radar (KDLH), 48 km from the middle of the area, began a volume at 20:56 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 23, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.9 hours before the alert went out and 223 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: 84 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 23, 2:11 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, May 23, 2:11 PM CDT, 1 hour 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
211 PM CDT WED MAY 23 2007

.DISCUSSION...
SLOW MOVG CFNT OVR WRN MN CONTS TO EDGE EWD. CONVECTIVE ACTIVITY
DEVELOPING IN A ZONE JUST AHD OF THE FNT EARLY THIS AFTN...WITH
BEST CHC OF SVR OVR CENT PLAINS INVOF HIGHER TEMPS/DPTS. SEE
LATEST SWODY1 DISC FOR DETAILS. MODERATE AMT OF INSTAB OVR OUR CWA
THIS AFTN AND APPROACHING CFNT COULD STILL RESULT IN ISOLD SVR
CELLS LATE THIS AFTN/EVE. SFC LI/S AS LOW AS -3 AND SFC BASED CAPE
UP TO 1000 J/KG. CFNT WILL MOVE THRU OUR CWA ON THU AS FNTL WAVE
RIDES UP THE FNT...BRINGING PLENTY OR RAIN TO ERN HALF OF OUR
CWA...WHERE AMTS COULD APPROACH ONE INCH. MODELS IN VERY GOOD
AGMT ON THIS SCENARIO. SHORT BREAK EXPECTED ON FRI UNDER DRY SLOT
BEFORE ANOTHER S/WV EMERGES FROM THE L/WV TROF AND HEADS TWRD THE
GRT LKS. THIS WILL GENERATE ANOTHER SUBSTANTIAL SFC SYSTEM THAT
WILL KEEP RAIN CHCS IN THE AREA FOR MOST OF THE WEEKEND. SYSTEM
MAY DEPART SOON ENUF FOR SUNSHINE TO RETURN BY SUN AFTN...THEN MON
LOOKS DRY AS SFC HIGH PUSHES IN AGN.

&&

.AVIATION...
SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE EASTERN
HALF OF THE NORTHLAND TONIGHT. MVFR/IFR CONDITIONS WILL PREVAIL IN
THESE AREAS. A FRONT WILL ALSO CONTINUE TO SHIFT INTO THE WESTERN
AREAS INCLUDING KINL TO KBRD...AND REACH KHIB TO KDLH BY EARLY
THURSDAY MORNING. WINDS WILL SWITCH TO THE WEST BEHIND THIS FRONT.
ABUNDANT LOW LEVEL MOISTURE WILL LIKELY KEEP MVFR AND IFR CONDITIONS
WITH AREAS OF FOG PREVALENT OVERNIGHT. A STRONG WARM FRONT WILL LIFT
BACK NORTH THURSDAY...WITH SHOWERS AND THUNDERSTORMS LIKELY.

&&

POINT TEMPS/POPS...
DLH  51  58  39  62 /  50  70  10  10
INL  48  57  37  54 /  30  50  10  10
BRD  49  59  41  63 /  30  60  10  20
HYR  56  66  43  65 /  60  70  10  10
ASX  56  63  44  64 /  60  70  10  10

&&

.DLH WATCHES/WARNINGS/ADVISORIES...

MN...NONE.
WI...NONE.
LS...NONE.

04/LILES

Hazardous weather outlook, May 23, 5:25 AM CDT, 10 hours 28 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
May 23, 4:09 PM CDT	Special Marine Warning	DLH		36 min
May 23, 5:31 PM CDT	Special Marine Warning	DLH		29 min
May 23, 4:10 PM CDT	Tornado Warning	DLH	Burnett	50 min
May 23, 4:30 PM CDT	Tornado Warning	DLH	Bayfield	60 min
May 23, 4:42 PM CDT	Severe Thunderstorm Warning	DLH	Washburn	48 min
May 23, 5:13 PM CDT	Tornado Warning	DLH	Washburn	32 min
May 23, 5:27 PM CDT	Tornado Warning	DLH	Ashland, Bayfield	33 min
May 23, 6:16 PM CDT	Severe Thunderstorm Warning	DLH	Sawyer	44 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2007 Every severe thunderstorm warning in 2007

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.