Wednesday, September 8, 2010

9/8/10: Wednesday's Weather Report

Issued at 3:27 PM CDT, Wednesday, September 8th, 2010

Rainfall report from Tuesday, September 7th, 2010. Source: NWS Duluth, Minnesota.

Hayward WI: 0.18"

Crane Lake MN: 0.13"

Embarrass MN: 0.22"

Kabetogama MN: 0.20"

3 miles East of Orr MN: 0.38"

2 miles South of Tower MN: 0.26"

Butternut WI: 0.30"

Upson WI: 0.35"

4 miles West of Clam Lake WI: 0.22"

Weather tidbits:

*September 2009 produced 18 days with a maximum temperature of at least 70 degrees and 2 days with a maximum temperature of at least 80 degrees at Duluth, Minnesota.

*September 2010 (although only 8 days old) has produced just 1 day with a high temperature of at least 70 degrees (9/1/10)

*1.65" of rain has fallen at Duluth, Minnesota through September 7th, 2010. This surpasses the total amount of rain we had all of September 2009 (1.40")

*Today marks the 7th consecutive day with a below normal high temperature at Duluth, Minnesota.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

A ridge of high pressure averaging 1022 mb extended from Western Ontario Province through Central Minnesota south into the Central Plains. Partly-mostly cloudy skies were found across our area Today with highs in the lower 50s in far Northeast Minnesota with middle 50s to lower 60s elsewhere. Winds Today were calm or west/northwest in direction under 15 mph.

Today's Upper Level Analysis:

RUC model analysis and water vapor satellite imagery reveals an upper level trough covering Eastern Canada, Northeast U.S. and Eastern Great Lakes. An upper level ridge was spreading east into the Upper Midwest while a new upper level trough heads east through the Western U.S.


High pressure ridge will be in control of our weather with clear-partly cloudy skies and cool temperatures. Lows will be in the 40s with some 30s in the typical cold spots. Winds will be variable or east in direction under 15 mph. Note: Patchy frost could develop late Tonight away from Lake Superior.

Thursday and Thursday Night:

Ridge of high pressure will be centered to our north/east during this period while low pressure remains over the Western High Plains. East-southeast winds will develop across our area during this period with wind speeds from 10-20 mph. Partly-mostly cloudy skies are forecast with a few showers possible, mainly along and west-southwest of a line from International Falls to Aitkin, better prospects for rain will occur west-southwest of our local area during this period. Highs Tomorrow will be in the 50s and 60s with lows Tomorrow Night in the 40s and 50s.

Extended Forecast:

Warm and moist advection pattern will be in full swing for Friday and Friday Night as low pressure heads northeast through the Northern Plains, reaching the Manitoba Lakes region by Friday Night-early Saturday. A cold front extending south of that low will move east and through the Upper Midwest from Friday Afternoon into Saturday Morning. A southerly low level jet of 30-50 knots is expected to develop along and ahead of this system for Friday and Friday Night. Dewpoints are forecast to climb into the 50s with PWS averaging 1.10-1.50". 850 mb temperatures which were in the +2/+6 degree range This Afternoon will climb to between +8/+14 degrees C by Friday. Rain/showers will develop first in Western parts of our area late Friday Afternoon, then will overspread the remainder of the area Friday Evening and Overnight Friday. Rain will then end from west to east Saturday Morning the way it looks now. Isolated thunderstorms could also occur late Friday Afternoon into Friday Night with weak instability in place (CAPES <250 j/kg) High temperatures will be mainly in the 60s for Friday and Saturday although it will be cooler near Lake Superior on Friday. Lows Friday Night and Saturday Night will be in the 40s and 50s.

5 Day Forecast for Duluth/Superior

.Tonight... Partly cloudy. Low 40 to 45. Wind becoming east around 12 mph.

.Thursday... Partly sunny. High 60 to 65, a little cooler near Lake Superior. Wind east at 10 to 20 mph.

.Thursday Night... Partly cloudy. Low 45 to 50. Wind east at 10 to 15 mph.

.Friday... Increasing cloudiness. High 60 to 65 but cooler near Lake Superior.

.Friday Night... Showers developing between 8-11 PM. Showers continuing at times Overnight. Mostly cloudy. Low 50 to 55. Chance of rain 60%.

.Saturday... Showers possible during the Morning. Mostly cloudy. High 60 to 65. Chance of rain 40%.

.Saturday Night... Partly cloudy. Low 45 to 50.

.Sunday... Partly sunny. High 60 to 65.

Normal High Temperature Today 67 degrees

Normal Low Temperature Today 47 degrees