Tuesday, September 7, 2010

9/7/10: Tuesday's Weather Report

Issued at 3:23 PM CDT, Tuesday, September 7th, 2010

Rainfall report from Monday and early Tuesday, September 6th-7th, 2010. Source: NWS Duluth, MN.

Duluth MN: 0.80"

International Falls MN: 0.77"

Brainerd MN: 0.68"

Grand Marais MN: 0.52"

Hibbing MN: 1.42"

Ashland WI: 0.55"

Two Harbors MN: 0.84"

Silver Bay MN: 0.54"

Ely MN: 0.99"

Orr MN: 1.12"

Eveleth MN: 1.13"

Bigfork MN: 0.95"

Grand Rapids MN: 1.15"

Cloquet MN: 0.92"

McGregor MN: 0.81"

Superior WI: 0.76"

3 miles Northeast of Nisswa MN: 0.91"

Cass Lake MN: 1.70"

Dixon Lake MN: 2.08"

Littlefork MN: 0.85"

Northome MN: 1.24"

Cook MN: 1.17"

Embarrass MN: 1.05"

Floodwood MN: 1.65"

Kabetogama MN: 1.11"

Butternut WI: 0.59"

9 miles North of Bayfield WI: 0.78"

Washburn WI: 0.80"

Winter WI: 0.48"

Weather History:

On this date in 1986... A record low temperature of 30 degrees occurred at Duluth, Minnesota.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

Strong low pressure (1000 mb) extended from Central Lake Superior to Eastern Ontario Province as of mid-Afternoon with high pressure (1020 mb) centered in Central Nebraska. Brisk winds out of the north/west at 10-25 mph with gusts topping 30 mph occurred Today behind this low pressure system. Mostly cloudy skies with lingering light rain showers and patchy drizzle also fell over parts of our area Today, but the heavier rainfall/embedded thunderstorms which occurred last night exited the area early This Morning. High temperatures Today were only in the 50s which is about 10 to almost 20 degrees below normal for early September.

Today's Upper Level Analysis:

A vigorous upper level low (5580 meters) continued to track toward the E/NE Today as it passes through Central Lake Superior/Upper Michigan This Afternoon per water vapor satellite imagery. A northwest 500 mb flow covered the Upper Midwest Today in wake of this Autumn like storm. A new upper level low/upper trough was in place over Western Canada and the Pacific Northwest and this system will eventually affect our weather later this week.

Tonight through Wednesday Night:

High pressure currently over the Western High Plains will head east into the Upper Midwest during this period. Skies will become partly cloudy in Northern Minnesota and Northwest Wisconsin Tonight as deep low pressure over Lake Superior moves farther toward the north/east. Scattered light rain showers/sprinkles will end before 8 PM, then mainly dry weather can be expected through Wednesday Night along with partly cloudy skies. Lows Tonight and Tomorrow Night will be in the 30s and 40s, but a few 20s can't be ruled out in the typical cold spots. Patchy frost could develop late Tonight and again late Wednesday Night, mainly away from Lake Superior. Winds will be out of the north or west at 10-20 mph Tonight and Tomorrow with variable to easterly winds Tomorrow Night under 15 mph.

Extended Forecast:

High pressure will be centered to our east with another high off to our north for Thursday and Friday while off to our west there will be an upper level trough that will head east into the Northern Plains and Upper Midwest from Thursday into Saturday. Low pressure is forecast to pass northeast through the Northern Plains, then into the Manitoba Lakes region around Saturday with a cold front attached to that low pushing east and through our local area from Friday Night into midday Saturday. Timing of this system and when the best chance/s for rain will occur are still a tad uncertain at this point, but right it looks to be mainly a Friday Evening through mid-Afternoon Saturday event with rain spreading east/northeast during that time. Instability looks fairly marginal at this point, but there could be just enough to cause isolated thunderstorms around our area Friday Night and early Saturday. Also, a few showers may move through Western-Southern parts of our area Thursday or Thursday Night, although the bulk of this rain should remain over Western-Southern Minnesota. High temperatures for Thursday and Friday will be mainly in the 50s and 60s with lows in the 40s and 50s both nights.

5 Day Forecast for Duluth/Superior

.Tonight... Spotty brief light rain showers or sprinkles possible through 7 PM. Mostly cloudy with partial clearing developing. Low 38 to 43. Wind northwest at 10 to 20 mph.

.Wednesday... Partly cloudy. High 58 to 63. Wind northwest at 10 to 20 mph.

.Wednesday Night... Partly cloudy. Low 38 to 43. Wind becoming east at 5 to 15 mph.

.Thursday... Partly sunny. High 58 to 63.

.Thursday Night... Partly to mostly cloudy. Low 45 to 50.

.Friday... Partly sunny. High 58 to 63.

.Friday Night... Mostly cloudy. Showers developing, especially late. Low 50 to 55. Chance of rain 40%.

.Saturday... Mostly cloudy. Showers possible, especially through early Afternoon. High 60 to 65. Chance of rain 40%.

Normal High Temperature Today 67 degrees

Normal Low Temperature Today 48 degrees

Tim