Alert archive / Wisconsin / Special Weather Statements in 2017

Special Weather Statement, NWS Milwaukee, WI

July 12, 2017Lafayette County, Wisconsin

NWS Milwaukee, WI issued this special weather statement at Jul 12, 2017, 1:02 PM CDT for Lafayette County, Wisconsin. It was in force for 28 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 12, 2017, 1:02 PM CDT (18:02 UTC)
Expired
Jul 12, 2017, 1:30 PM CDT
In force
28 min
Issued by
NWS Milwaukee, WI

County Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 119 km from the middle of the area, began a volume at 18:02 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

Davenport, (KDVN), launched 12:00Z, 6.0 hours before the alert went out and 116 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, Davenport, at 12:00Z on 2017-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1137 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, Davenport, at 12:00Z on 2017-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 273 square meters per square second.193958Sfc1 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
1137 J/kg
Mixed-layer CIN
-248 J/kg
Mixed-layer LCL
1424 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
273 m²/s²
0-3 km storm-relative helicity
267 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

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 Milwaukee, WI wrote its last area forecast discussion before this special weather statement went out at Jul 12, 12:53 PM CDT, 9 minutes earlier.

Area forecast discussion, Jul 12, 12:53 PM CDT, 9 minutes before
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Hazardous weather outlook, Jul 12, 11:22 AM CDT, 1 hour 40 minutes before
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
1122 AM CDT Wed Jul 12 2017

WIZ046-047-051-052-056>060-062>072-131630-
Marquette-Green Lake-Fond Du Lac-Sheboygan-Sauk-Columbia-Dodge-
Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee-
Lafayette-Green-Rock-Walworth-Racine-Kenosha-
1122 AM CDT Wed Jul 12 2017

This Hazardous Weather Outlook is for portions of east central
Wisconsin, south central Wisconsin, and southeast Wisconsin.

.DAY ONE...This Afternoon and Tonight

Another round of scattered to numerous thunderstorms is expected
from late afternoon through the evening hours. A few storms could
be severe with damaging winds and large hail being the primary
threats. A tornado or two is possible. There is a small threat of
flash flooding with this new round of storms. The storms will be
moving quickly which will limit the threat of flash flooding. The
most susceptible area for flash flooding would be Walworth,
Racine, and Kenosha Counties but also including any large urban
areas over southern Wisconsin.

The Heat Index is expected to climb into the 90s this afternoon
and early evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a chance of thunderstorms Thursday morning, Saturday
night and Tuesday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed later this afternoon and this
evening. Rainfall and flooding reports are appreciated.

LMZ643>646-131630-
Sheboygan to Port Washington WI-
Port Washington to North Point Light WI-
North Point Light to Wind Point WI-
Wind Point WI to Winthrop Harbor IL-
1122 AM CDT Wed Jul 12 2017

This Hazardous Weather Outlook is for portions of Lake Michigan.

.DAY ONE...This Afternoon and Tonight

Isolated thunderstorms will remain possible this afternoon but
more scattered to numerous thunderstorms are expected this evening
over the western near shore of Lake Michigan. Some of these
storms could be severe with damaging winds and large hail. A
waterspout cannot be ruled out.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a chance of thunderstorms Thursday morning, Saturday
night and again Tuesday afternoon.

www.weather.gov/mkx
MG

In the hours before

Local storm report, Jul 12, 10:43 AM CDT, 2 hours 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1043 AM CDT WED JUL 12 2017

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

1000 AM     HEAVY RAIN       3 ESE BOHNERS LAKE      42.61N 88.23W
07/12/2017  M7.75 INCH       KENOSHA            WI   MESONET

            NMSW3 RIVER GAUGE...NEW MUNSTER DCP.

&&
Local storm report, Jul 12, 11:20 AM CDT, 1 hour 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1120 AM CDT WED JUL 12 2017

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

0730 AM     HEAVY RAIN       PADDOCK LAKE            42.57N 88.10W
07/12/2017  M4.54 INCH       KENOSHA            WI   COCORAHS

&&
Local storm report, Jul 12, 11:32 AM CDT, 1 hour 30 minutes before
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Local storm report, Jul 12, 11:34 AM CDT, 1 hour 28 minutes before
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Local storm report, Jul 12, 12:30 PM CDT, 32 minutes before
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Special weather statement, Jul 12, 1:02 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
102 PM CDT WED JUL 12 2017

WIZ067-068-121830-
Green-Lafayette-
102 PM CDT WED JUL 12 2017

...A STRONG THUNDERSTORM WILL AFFECT LAFAYETTE COUNTY...

At 102 PM CDT, a strong thunderstorm was located near Belmont, or 10
miles southeast of Platteville, moving east at 50 mph.

Winds in excess of 30 mph and dime size hail are possible with this
storm.

Locations impacted include...
Darlington, Shullsburg, Belmont, Benton, Argyle, Somers, Wiota, South
Wayne, Lamont, Gratiot, Lead Mine and Woodford.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4257 9041 4274 9041 4276 8983 4255 8983
TIME...MOT...LOC 1802Z 271DEG 42KT 4265 9031

GAGAN

The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 11, 8:42 PM CDTSpecial Weather StatementMKXLafayette63 min
Jul 11, 9:03 PM CDTRiver Flood WatchMKXKenosha6 days
Jul 11, 9:20 PM CDTSpecial Weather StatementMKXIowa40 min
Jul 11, 9:50 PM CDTSpecial Weather StatementMKXIowa55 min
Jul 11, 10:01 PM CDTSevere Thunderstorm WarningMKXDane, Green29 min
Jul 11, 10:20 PM CDTSevere Thunderstorm WarningMKXDane, Green, Rock40 min
Jul 12, 12:02 AM CDTSpecial Weather StatementMKXKenosha, Racine, Walworth58 min
Jul 12, 12:20 AM CDTFlash Flood WarningMKXKenosha, Racine, Walworth10 hr
Jul 12, 12:55 AM CDTSpecial Weather StatementMKXLafayette50 min
Jul 12, 1:14 AM CDTSpecial Weather StatementMKXWalworth31 min
Jul 12, 1:33 AM CDTSevere Thunderstorm WarningMKXKenosha27 min
Jul 12, 1:34 AM CDTFlash Flood WarningMKXJefferson, Racine, Walworth, Waukesha3 hr
Jul 12, 3:26 AM CDTRiver Flood WarningMKXKenosha15 days
Jul 12, 4:25 AM CDTRiver Flood WarningMKXRacine6 days
Jul 12, 4:41 AM CDTRiver Flood WarningMKXWaukesha24 hr
Jul 12, 4:43 AM CDTSpecial Weather StatementMKXIowa32 min
Jul 12, 5:13 AM CDTSpecial Weather StatementMKXIowa32 min
Jul 12, 5:32 AM CDTSpecial Weather StatementMKXRock28 min
Jul 12, 5:55 AM CDTSpecial Weather StatementMKXColumbia, Marquette, Sauk35 min
Jul 12, 5:59 AM CDTSpecial Weather StatementMKXRacine46 min
Jul 12, 6:07 AM CDTSpecial Weather StatementMKXWalworth23 min
Jul 12, 6:36 AM CDTSpecial Weather StatementMKXColumbia, Sauk54 min
Jul 12, 7:01 AM CDTSpecial Weather StatementMKXColumbia, Dane, Iowa, Sauk44 min
Jul 12, 7:06 AM CDTSpecial Weather StatementMKXKenosha, Racine54 min
Jul 12, 7:18 AM CDTSevere Thunderstorm WarningMKXDane, Green, Jefferson, Rock27 min
Jul 12, 7:32 AM CDTSpecial Marine WarningMKX88 min
Jul 12, 7:40 AM CDTSpecial Weather StatementMKXGreen, Jefferson, Rock, Walworth35 min
Jul 12, 7:49 AM CDTAreal Flood AdvisoryMKXDane3 hr
Jul 12, 8:06 AM CDTSpecial Weather StatementMKXMilwaukee, Waukesha39 min
Jul 12, 8:16 AM CDTAreal Flood AdvisoryMKXRock3 hr
Jul 12, 8:36 AM CDTSpecial Weather StatementMKXKenosha, Racine24 min
Jul 12, 10:07 AM CDTAreal Flood WarningMKXKenosha, Racine, Walworth6 hr
Jul 12, 10:21 AM CDTRiver Flood WarningMKXWaukesha24 hr
Jul 12, 11:25 AM CDTRiver Flood WarningMKXRock17 hr
Jul 12, 4:18 PM CDTRiver Flood WarningMKXLafayette51 hr
Jul 12, 4:18 PM CDTRiver Flood WarningMKXRock51 hr
Jul 12, 4:22 PM CDTRiver Flood WatchMKXJefferson48 hr
Jul 12, 5:55 PM CDTAreal Flood WarningMKXKenosha, Racine, Walworth24 hr

Nearby

Special Weather Statements in Wisconsin, 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.