Alert archive / Wisconsin / Special Weather Statements in 2017

Special Weather Statement, NWS Milwaukee, WI

July 21, 2017Iowa County, Lafayette County, Wisconsin

NWS Milwaukee, WI issued this special weather statement at Jul 21, 2017, 12:42 PM CDT for Iowa County, Lafayette County, Wisconsin. It was in force for 63 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 21, 2017, 12:42 PM CDT (17:42 UTC)
Expired
Jul 21, 2017, 1:45 PM CDT
In force
63 min
Issued by
NWS Milwaukee, WI

Counties Iowa County, WI, Lafayette County, WI

The radar

The Milwaukee radar (KMKX), 135 km from the middle of the area, began a volume at 17:45 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, 5.7 hours before the alert went out and 134 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 2017-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 81 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 2017-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 125 square meters per square second.1939Sfc1 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
81 J/kg
Mixed-layer CIN
-302 J/kg
Mixed-layer LCL
1173 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
125 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Milwaukee, WI wrote its last area forecast discussion before this special weather statement went out at Jul 21, 12:20 PM CDT, 22 minutes earlier.

Area forecast discussion, Jul 21, 12:20 PM CDT, 22 minutes before
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Hazardous weather outlook, Jul 21, 4:10 AM CDT, 8 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
410 AM CDT Fri Jul 21 2017

WIZ046-047-051-052-056>060-062>072-220915-
Marquette-Green Lake-Fond Du Lac-Sheboygan-Sauk-Columbia-Dodge-
Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee-
Lafayette-Green-Rock-Walworth-Racine-Kenosha-
410 AM CDT Fri Jul 21 2017

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

.DAY ONE...Today and Tonight

Several rounds of thunderstorms are expected from this afternoon
through the overnight hours. Repeated rounds of storms over the
same area will produce heavy rain that would affect the already
high rivers. A flash flood watch is in effect for all but east
central WI. Damaging winds, large hail and even a tornado are
possible.

Heat index values in the middle to upper 90s are forecast across
mainly southern and western portions of the area this afternoon.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms Saturday and Sunday, and again
Wednesday night through Thursday.

Heat index values in the middle 90s are forecast across mainly
southern portions of the area Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and tonight.

LMZ643>646-220915-
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-
410 AM CDT Fri Jul 21 2017

This Hazardous Weather Outlook is for portions of Lake Michigan.

.DAY ONE...Today and Tonight

Thunderstorms will develop this afternoon and overspread all of
southern Wisconsin tonight before tapering off Saturday morning.
Gusty winds and hail are possible at times. There is a slight risk
for severe storms during this period.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms Saturday and Sunday, and again
Wednesday night through Thursday.

Cronce

www.weather.gov/mkx

In the hours before

Special weather statement, Jul 21, 12:42 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 9:29 AM CDTRiver Flood WarningMKXSauk5 days
Jul 21, 2:03 PM CDTSpecial Weather StatementMKXGreen, Rock72 min
Jul 21, 5:04 PM CDTSpecial Weather StatementMKXLafayette71 min
Jul 21, 5:21 PM CDTSpecial Weather StatementMKXGreen24 min
Jul 21, 5:31 PM CDTSpecial Weather StatementMKXLafayette29 min
Jul 21, 5:46 PM CDTAreal Flood AdvisoryMKXDane3 hr
Jul 21, 5:50 PM CDTSpecial Weather StatementMKXRock25 min
Jul 21, 5:55 PM CDTSpecial Weather StatementMKXGreen20 min
Jul 21, 6:02 PM CDTSpecial Weather StatementMKXLafayette28 min
Jul 21, 6:14 PM CDTSpecial Weather StatementMKXRock31 min
Jul 21, 6:23 PM CDTSpecial Weather StatementMKXLafayette22 min
Jul 21, 6:40 PM CDTSpecial Weather StatementMKXRock35 min
Jul 21, 6:44 PM CDTSpecial Weather StatementMKXLafayette31 min

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.