The first widespread snow event of the 2007-08 winter season affected south-central and southeast Wisconsin on November 21st.  Snow accumulations were in the 1 to 3 inch range.  Media reports indicated that dozens vehicle accidents occurred.  Temperatures were in the upper 20s to lower 30s and the snowflakes were large and moist.  Maximum accumulations included 3 inches in southern Sheboygan County, northeastern Washington County, and from north of Elkhorn in Walworth County to central Waukesha County.  Otherwise the remainder of south-central and southeast Wisconsin had 1 to 2.5 inches.  Initially, the precipitation started off as rain, but changed over to snow between 1600CST and 1700CST west of Madison and between 1800CST and 1900CST in the Sheboygan to Kenosha area.  Synoptically, a strong, upper-level short wave trough moving from Colorado to Illinois was responsible for the snow.  Additionally, southern Wisconsin was under the right-rear quadrant of a 140 knot jet streak over the Great Lakes region.  This is a favored region of lift/upward vertical motion.

Winter Weather in SHEBOYGAN, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in COLUMBIA, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in WALWORTH, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in MARQUETTE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in WAUKESHA, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in WASHINGTON, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in LAFAYETTE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in MILWAUKEE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in OZAUKEE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in IOWA, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in GREEN LAKE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in FOND DU LAC, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in RACINE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in DANE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in JEFFERSON, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in KENOSHA, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in DODGE, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in GREEN, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Weather in ROCK, WISCONSIN
From 21-NOV-07 15:00:00 to 21-NOV-07 23:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations