Wednesday, January 11, 2017

Snow is done but now the arctic air returns! Bitterly cold through Friday. Accumulated Winter Season Severity Index in this post

/Issued 5:06 PM CST, Wednesday, January 11, 2017/


More information at the links below.

Wind Chill Advisory

Winter Weather Advisory

Tonight's low temperature forecast.  Source:

Thursday's high temperature forecast.  Source:

Accumulated Winter Season Severity Index (AWSSI) updated as of January 11, 2017.  

Click on the link for a map of the U.S. and city rankings

What is the AWSSI?   "The severity of a winter is related to the intensity and persistence of cold weather, the frequency and amount of snow, and the amount and persistence of snow on the ground. The Accumulated Winter Season Severity Index (AWSSI) was developed to objectively quantify and describe the relative severity of the winter season".


Note:  Categories range from Extreme, Severe, Normal, Moderate and Mild -- Bismarck and Rapid City this winter has been a rough one thus far with an extreme category, while in most of Minnesota including here in Duluth, International Falls and the Twin Cities this winter has been Moderate (Really not that bad so far)

Bismarck, North Dakota

AWSSI value:  781
Category:  Extreme

Rapid City, South Dakota

AWSSI value:  460

Category:  Extreme

International Falls, Minnesota

AWSSI value:  749
Category:  Moderate

Duluth, Minnesota

AWSSI value:  591
Category:  Moderate

Twin Cities, Minnesota

AWSSI value:  380
Category:  Moderate

Weather Synopsis:

The day started out a little snowy in parts of the Northland with anywhere from a dusting to a few inches of fluffy snow reported (Officially 1.0" of snow reported at the Duluth Airport this morning)

Skies this afternoon ranged from mostly sunny in northern Minnesota to partly to mostly cloudy in northwest Wisconsin.  Highs today were in the single digits -- Much colder than it was on Tuesday.

*One area of high pressure will build southeast out of the northern Plains tonight which will be followed by an even stronger high which will also build southeast out of the northern Plains from Thursday into Friday -- In between the two highs will be a cold front which will move through the Northland on Thursday.  There could be a few flurries or snow showers accompanying that front but no accumulation is expected.

Lows tonight will be in the single digits, teens and 20s below zero with highs on Thursday in the single digits.  Lows Thursday night will be in the teens, 20s and 30s below with highs on Friday in the single digits below to single digits above zero.

Note:  Winds will increase and become quite gusty in northeast Minnesota and northwest Wisconsin on Thursday.  South or southwest winds will turn more to the west once the cold front moves through.  Wind speeds are forecast to range from 15 to 25 mph with gusts over 30 mph expected.  Areas of blowing snow are possible on Thursday.

Forecast for Duluth and Superior

Event:  *Wind Chill Advisory for Duluth*
Timing:  9 PM this evening until 10 AM CST Thursday

.Tonight...  Very cold.  Clear to partly cloudy.  Low 8 below to 13 below.  Wind west at 10 to 15 mph.  Wind chills 20 below to 30 below.

.Thursday...  Partly to mostly cloudy.  Areas of blowing snow.  A few flurries possible.  High 3 to 8.  Breezy with a southwest wind at 15 to 20 mph becoming west later in the day, wind gusts to 30 mph possible.  Morning wind chills 20 below to 30 below.

Normal temperatures for Thursday

High:  19
Low:      1

Sunrise Thursday:  7:51 AM CST
Sunset Thursday:   4:44 PM CST