Winter Weather bar

 Winter weather can impact all aspects of society, from travel to commerce to utilities, and it can be life threatening. Be prepared before winter weather hits to protect you and your family at home or on the road.

Latest Winter Storm Watch/Warning/Advisory

Forecasted Snow Amounts

Contents:
Daily Snowfall Amounts and Forecasted Amounts
Definitions
Winter Weather Safety
Road Conditions
Winter Weather Statistics


Daily Snowfall Amounts


Winter Weather Definitions:

Winter Storm Watch - Conditions are favorable for hazardous winter weather conditions including heavy snow, blizzard conditions, or significant accumulations of freezing rain or sleet. These watches are usually issued 12 to 36 hours in advance of the event.

Winter Storm Warning - Hazardous winter weather conditions that pose a threat to life and/or property are occurring, imminent or likely. The generic term, winter storm warning, is used for heavy snow of 6 inches or greater, heavy sleet of half inch or more, or a combination of two or more of the following winter weather events; heavy snow, freezing rain, sleet and strong winds. The following event-specific warnings are issued for a single weather hazard:

  • Blizzard Warning - Sustained winds or frequent gusts of 35 mph or greater, considerable falling and/or blowing snow reducing visibility frequently to 1/4 mile or less for a period of three hours or more. There are no temperature criteria in the definition of a blizzard but freezing temperatures and 35 mph winds will create single digit wind chills.
  • Lake Effect Snow Warning - Lake effect snowfall of 6 inches or more in 12 hours or less, or 8 inches or more in 24 hours or less.
  • Ice Storm Warning - Accumulations of 1/4 inch or more of freezing rain.

Winter Weather Advisory - Hazardous winter weather conditions are occurring, imminent or likely. Conditions will cause a significant inconvenience and if caution is not exercised, will result in a potential threat to life and/or property. The generic term, winter weather advisory, is used for a combination of two or more of the following events; snow, freezing rain or drizzle, sleet, blowing snow.

Wind Chill Warning - Extreme wind chills of -30oF or colder.
A Wind Chill Warning is issued when the wind chill will be less than or equal to -30oF AND winds greater than or equal to 10 mph.

Wind Chill Advisory - Dangerous wind chills of -20oF to -30oF.
A Wind Chill Advisory will be issued when the wind chill is less than or equal to -20oF AND the winds are greater than or equal to 10 mph.

Wind Chill Temperature Chart
Wind Chill Chart
Click here for a Wind Chill Calculator

Winter Weather Safety

Road Conditions:

Winter Weather Statistics


MONTHLY SNOWFALL NORMALS FOR O'HARE (1981-2010)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Annual
10.8
9.1
5.6
1.2
T
0
0
0
0
0.2
1.2
8.2
36.3
 
MONTHLY SNOWFALL NORMALS FOR ROCKFORD (1981-2010)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Annual
10.2
7.7
4.8
0.9
T
0
0
0
0
0.1
1.7
11.3
36.7

 


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