Blizzard Warning

Sorry for one more email but this is really exceptional: NWS just added Cook and Dupage to a Blizzard Warning until 9:00 tomorrow morning.

The low continues to deepen and conditions are atrocious in Iowa. Many major roads are closed and impassable. The switch to snow is beginning across Chicago and the snow will intensify from west to east around 5-6pm. The worst conditions will arrive with heavy snow and winds over 40 mph (gusting to 50+) from 9pm through midnight. Snow totals are largely unchanged from prior models (see below; I'm taking the under by an inch or two, especially along the lake, but that doesn't change the fact that this is a big, nasty storm).

The very sharp line between rain/snow and light/heavy remains in place, running SW to NE right through the area. 10+ inches of heavy, wet snow will be separated by only 10-20 miles from a little slushy accumulation.

The airports are already a mess and by 8-9pm tonight the roads will be very tough. Hopefully crews can catch up by tomorrow morning but we'll see...

(Reminder: a blizzard is actually a specific term defined by three or more consecutive hours of 35+ mph sustained winds that cause blowing or falling snow to create visibility below 1/4 mile. There is no threshold for snowfall accumulation that pertains to a blizzard.)


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