Alert archive / Wisconsin / Winter Storm Watches in 2018

Winter Storm Watch 9, NWS La Crosse, WI

April 16, 201811 counties in Wisconsin; 8 counties in Iowa; 7 counties in Minnesota

NWS La Crosse, WI issued this winter storm watch at Apr 16, 2018, 3:11 AM CDT for 11 counties in Wisconsin; 8 counties in Iowa; 7 counties in Minnesota. It took effect at Apr 18, 2018, 1:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 16, 2018, 3:11 AM CDT (08:11 UTC)
In effect from: Apr 18, 2018, 1:00 AM CDT
Expired: Apr 17, 2018, 3:19 PM CDT
In force
Issued by: NWS La Crosse, WI

All 26 counties

Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Crawford County, WI, Grant County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 37 km from the middle of the area, began a volume at 08:17 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, 8.2 hours before the alert went out and 212 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 598 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 172 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 winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before this winter storm watch went out at Apr 15, 11:40 PM CDT, 3 hours 31 minutes earlier.

Area forecast discussion, Apr 15, 11:40 PM CDT, 3 hours 31 minutes before

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Hazardous weather outlook, Apr 15, 8:50 PM CDT, 6 hours 21 minutes before

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In the hours before

Local storm report, Apr 15, 9:18 PM CDT, 5 hours 53 minutes before

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Local storm report, Apr 15, 9:59 PM CDT, 5 hours 12 minutes before

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Local storm report, Apr 15, 10:01 PM CDT, 5 hours 10 minutes before

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Nearby

Winter Storm Watches in Wisconsin, 2018 Winter Storm Watches in Iowa, 2018 Winter Storm Watches in Minnesota, 2018 Every winter storm watch in 2018

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.