Monday, September 13, 2010

9/13/10: Monday's Weather Report

Issued at 4:22 PM CDT, Monday, September 13th, 2010

Weather tidbits:

*High temperature of 68 degrees at Duluth, Minnesota on Sunday, September 12th, 2010 was our warmest high temperature since September 1st, 2010 when our maximum temperature was 73 degrees.

*September 2010 has only had 1 day so far with a high temperature of at least 70 degrees at Duluth, Minnesota.

*10th wettest summer on record since the late 1800s in Minnesota. 3rd wettest summer on record in Iowa. And the wettest summer on record in Wisconsin.

Rainfall report from Friday, September 10th, 2010. Source: NWS Duluth, Minnesota.

Duluth MN: 0.22"

International Falls MN: 0.47"

Brainerd MN: 0.36"

Grand Marais MN: 1.19"

Hibbing MN: 0.52"

Ashland WI: 0.50"

Two Harbors MN: 0.36"

Ely MN: 0.46"

Crane Lake MN: 0.37"

Bigfork MN: 0.57"

Grand Rapids MN: 0.25"

Aitkin MN: 0.32"

Cook MN: 0.54"

Embarrass MN: 0.30"

Kabetogama MN: 0.76"

3 miles East of Orr MN: 0.51"

Butternut WI: 0.52"

4 miles West of Clam Lake WI: 0.34"

Washburn WI: 0.42"

Weather History:

On this date in 1990... A record high temperature of 84 degrees occurred at Duluth, Minnesota.

On yesterday's date (9/12) in 2007... A record low temperature of 29 degrees occurred at Duluth, Minnesota.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

Mostly sunny skies occurred in Northwest Wisconsin back through Eastcentral Minnesota Today while clouds were more common in Northern-far Northeast Minnesota. High temperatures Today were in the 50s in Northern Minnesota due to the thicker cloudcover while southern areas had highs in the 60s. Winds Today were out of the west or northwest at 5-15 mph with higher gusts. Surface map as of mid-Afternoon featured high pressure averaging 1024 mb stretching from Central Alberta Province through Western Saskatchewan Province with a few areas of low pressure averaging 1012-1016 mb covering the Western High Plains. A stationary front attached to this low extended from the Western Dakotas through Southern Nebraska through far Southern Iowa.

Today's Upper Level Analysis:

A west-northwest flow aloft covered the Upper Midwest Today per water vapor satellite imagery with a 500 mb trough in place over Eastern Canada/Northeast U.S. as well as in the Western U.S. An upper level ridge covered the Southern U.S. Today. A tight temperature gradient was in place Today with near 60 degree temperatures in Northern Minnesota while 80s and 90s covered much of the Central Plains into the Western High Plains. 850 mb temperatures late Today ranged from +3/+7 degrees C in Northern Minnesota to +20/+28 degrees C from Western South Dakota through the Plains and Rockies.

Tonight through Tuesday Night:

High pressure ridge will extend from Lake Superior northwest through Central Canada during this period while low pressure and a frontal boundary remain nearly stationary from the Western High Plains through Iowa. Partly-mostly cloudy skies will cover our local area from Tonight through Tomorrow Night with some showers/sprinkles possible due to some F-GEN forcing which will pass southeast out of Northern North Dakota Tonight and Tomorrow. Shower chances will start in Western-Northwest areas late Tonight, then will spread south/east through Tuesday Morning before ending Tuesday Afternoon. The bulk of any shower activity is forecast to remain west-south of a line from Big Falls to Two Harbors to Ashland with rainfall totals generally a trace to under 0.10". Lows Tonight and Tomorrow Night will be in the 30s and 40s with highs Tomorrow in the 50s and 60s. Patchy frost could form late Tonight and again late Tomorrow Night in the typical cold spots. Winds will be out of the north or west through Tuesday under 20 mph and from the north or east under 15 mph Tomorrow Night.

Extended Forecast:

High pressure will be centered to our north/east for Wednesday and Thursday while low pressure passes by to our south/east during that same time period. Rain associated with that southern low could spread into portions of our area by Wednesday Afternoon into Wednesday Night before ending early Thursday. Right now it appears that the best rain chances would be south of the Iron Range. Highs on Wednesday will be in the 50s to around 60 degrees with lows Wednesday Night mainly in the 40s. Highs for Thursday will be in the 50s and 60s with lows Thursday Night mainly in the 40s. A rather vigorous cold front is then expected to drop southeast and through our area late this week with an early season polar vortex setting up over Northern Canada (west of Hudson Bay) 850 mb temperatures underneath that vortex will be as low as -4/-10 degrees C by late this week for portions of Alberta/Saskatchewan Province and points north from there. Some showers could accompany the late week cold front as it moves through the Upper Midwest.

5 Day Forecast for Duluth/Superior

.Tonight... Increasing cloudiness. Sprinkles or light rain showers possible Overnight. Low 41 to 46. Wind west to northwest at 5 to 15 mph.

.Tuesday... Light rain showers or sprinkles possible mainly early. Considerable cloudiness with some sunshine developing during the Afternoon. High 57 to 62. Wind northwest at 10 to 15 mph.

.Tuesday Night... Partly cloudy. Low 40 to 45. Wind becoming east at 5 to 15 mph.

.Wednesday... Increasing cloudiness. Rain possible late. High 55 to 60. Chance of rain 30%.

.Wednesday Night... Rain possible. Mostly cloudy. Low 42 to 47. Chance of rain 40%.

.Thursday... Rain possible early. Partly sunny. High 58 to 63. Chance of rain 30%.

.Thursday Night... Partly to mostly cloudy. Low 43 to 48.

.Friday... Showers possible. Mostly cloudy. High 58 to 63. Chance of rain 20%.

Normal High Temperature Today 65 degrees

Normal Low Temperature Today 46 degrees

Tim