Alert archive / Wisconsin / Frost Advisories in 2020

Frost Advisory 5, NWS Milwaukee, WI

October 3, 20208 counties in Wisconsin

NWS Milwaukee, WI issued this frost advisory at Oct 3, 2020, 1:45 PM CDT for 8 counties in Wisconsin. It took effect at Oct 4, 2020, 12:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Oct 3, 2020, 1:45 PM CDT (18:45 UTC)
In effect from: Oct 4, 2020, 12:00 AM CDT
Expired: Oct 4, 2020, 8:00 AM CDT
In force: 8 hr
Issued by: NWS Milwaukee, WI

Counties Columbia County, WI, Dane County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Lafayette County, WI, Marquette County, WI, Sauk County, WI

The radar

The Milwaukee radar (KMKX), 92 km from the middle of the area, began a volume at 18:45 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.8 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1350 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 126 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 frost advisory 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 frost advisory went out at Oct 3, 9:16 AM CDT, 4 hours 29 minutes earlier.

Area forecast discussion, Oct 3, 9:16 AM CDT, 4 hours 29 minutes before

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Hazardous weather outlook, Oct 3, 3:41 AM CDT, 10 hours 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 3, 3:18 AM CDT	Small Craft Advisory	MKX		44 hr

Nearby

Frost Advisories in Wisconsin, 2020 Every frost advisory in 2020

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.