Saturday, May 15, 2010

5/15/10: Saturday's Weather Report

Issued at 3:20 PM CDT, Saturday, May 15th, 2010

Weather History:

On this date in 2004... A record low temperature of 26 degrees occurred at Duluth, MN.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

High pressure ridge (1027 mb) extended from Central Lake Superior south to Western Lake Michigan. A mix of high thin cirrus clouds and some cumulus clouds have been spreading north-northeast into our local area Today, but skies for the most part remained mostly sunny. Temperatures warmed into the lower 70s for areas away from Lake Superior...Near Lake Superior highs were in the 50s and 60s Today. 850 mb temperatures as of 3 PM ranged from +8/+10 degrees C across Northern Minnesota and Northwest Wisconsin. Winds Today were out of the south or east at 5-15 mph.

Today's 500 mb analysis:

Upper level trough covered Northeast Canada and the Northeast U.S. Today per water vapor satellite imagery. Weak winds aloft were in place over the Upper Midwest Today while a shortwave trough was centered across the Central Rockies with an upper level low (570 meters) located in Northeast Colorado/Eastern Wyoming per RUC model analysis. The big ridge of high pressure (588 meters) which covered much of the Southern/Southeast U.S. during the past several days has been surpressed Today...Bascially covering areas from Florida and Georgia through the Carolinas.

Tonight through Monday Night:

An area of high pressure will remain nearly stationary to our east through this period while an upper level disturbance works south/east out of the Northern Plains. Mainly dry conditions are forecast in Northern Minnesota and Northwest Wisconsin from Tonight through Monday Night, but isolated showers could develop especially away from Lake Superior Sunday Afternoon/Evening and again Monday Afternoon/Evening as some weak instability (CAPES generally under 250 j/kg) combines with dewpoints around 40 degrees along with some cold air aloft (-15/-18 degree C 500 mb temperatures) to warrant at least a mention of isolated rain shower activity in parts of our area. Lows Tonight will be in the 30s and 40s with mainly 40s expected for Sunday Night and Monday Night. Highs Tomorrow and Monday will be in the 60s and 70s but it will be cooler near Lake Superior. Winds from Tonight through Monday Night will be out of the south, north, or east generally under 15 mph.

Extended Forecast:

The weather pattern from Tuesday through the end of next week will be characterized by an upper level ridge of high pressure which will remain nearly stationary across the Upper Midwest while an upper level low passes well to our south. It looks dry around Northern Minnesota and Northwest Wisconsin from Tuesday through Friday with highs Tuesday and Wednesday in the 60s and 70s with lows Tuesday Night and Wednesday Night in the 40s to around 50 degrees.

5 Day Forecast for Duluth/Superior

.Tonight... Partly cloudy. Low 38 to 43. Wind south to southeast at 5 to 15 mph.

.Sunday... Partly sunny. High 65 to 70 but cooler near Lake Superior. Wind south to southeast at 5 to 15 mph.

.Sunday Night... Partly to mostly cloudy. Low 40 to 45. Wind southeast at 5 to 15 mph.

.Monday... Partly sunny. High 65 to 70 but cooler near Lake Superior.

.Monday Night... Partly to mostly cloudy. Low 40 to 45.

.Tuesday... Partly cloudy. High 68 to 73.

.Tuesday Night... Partly cloudy. Low 42 to 47.

.Wednesday... Partly cloudy. High 70 to 75.

Normal High Temperature Today 63 degrees

Normal Low Temperature Today 40 degrees