Saturday, August 21, 2010

8/21/10: Saturday's Weather Report

Issued at 7:48 PM CDT, Saturday, August 21st, 2010

So far the Summer of 2010 has been very wet across most of the Northland...Here are some rainfall totals and the departure from normal during the period from May 22nd through August 20th, 2010. Source: NWS Duluth, MN.

Winter WI (Sawyer County) 23.70"/10.50" Above Normal
Duluth MN (St. Louis County) 18.30"/6.08" Above Normal
Gordon WI (Douglas County) 18.59"/5.93" Above Normal
International Falls MN (Koochiching County) 16.16"/5.79" Above Normal
Federal Dam MN (Cass County) 13.99"/2.16" Above Normal
Tower MN (St. Louis County) 13.33"/0.48" Above Normal
Grand Portage MN (Cook County) 7.18"/2.42" Below Normal

Rainfall report from Northern Minnesota and Northwest Wisconsin. Date: Friday, August 20th, 2010. Source: NWS Duluth, MN.

Duluth MN: 0.41"

Grand Marais MN: 0.57"

Ashland WI: 0.43"

Hayward WI: 0.51"

Weather History:

On this date in 2004... A record low temperature of 37 degrees occurred at Duluth, Minnesota.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

Widespread low clouds and dense fog took a while to burn off, but once it did skies became partly-mostly sunny during the Afternoon. High temperatures were in the 70s to lower 80s, except 60s close to Lake Superior Today with dewpoints generally in the 60s along with east or north winds under 15 mph. An area of high pressure was centered over Central Minnesota early This Evening, this high combined with a building upper level ridge into the Upper Midwest capped off the atmosphere even with some instability around parts of our area This Afternoon.

Today's Upper Level Analysis:

W-NW 500 mb flow covered the Upper Midwest early This Evening with an upper level trough developing west of the Rockies per RUC model analysis and water vapor satellite imagery.

Tonight through Sunday Night:

High pressure will remain in control of our weather during this period as it sits over the Upper Midwest/Western-Central Great Lakes region. Mostly clear-partly cloudy skies will be found across the area with the possibility of some late night and early Morning fog. Lows Tonight and Tomorrow Night will be in the 50s and 60s with highs Tomorrow in the 70s and 80s, except somewhat cooler close to Lake Superior. Winds will be out of the south or east under 15 mph through this period.

Extended Forecast:

A vigorous area of low pressure will pass by well to our northwest-north early next week. A cold front attached to this low will move across our local area during the Monday Evening/early Tuesday time frame. Dewpoints in the 60s, PWS increasing to between 1.50-2.00" will develop along and ahead of this boundary on Monday, that combined with some weak instability with CAPES <1000 j/kg and Lifted Indicies around zero/-2 degrees C will lead to some showers or thunderstorms in Northern Minnesota and Northwest Wisconsin from late Monday Afternoon into early Tuesday. High temperatures on Monday will be in the 70s and 80s with lows Monday Night in the 50s and 60s. A strong SW 850 mb jet of 30-45 knots will also be in place on Monday out ahead of this cold front which could result in some gusty S-SW winds around our area at that time, sustained wind speeds of 15-25 mph will likely occur with some higher gusts possible. The cold front will be passing well of to our east on Tuesday with less humid and cooler conditions moving into the area. Highs will be in the 60s and 70s on Tuesday with lows in the 40s and 50s.

The middle of next week should remain tranquil as high pressure remains in control of Minnesota's weather. A change in the pattern is expected to take place late next week through next weekend and possibly into early the following week as an upper level trough develops over the Western U.S. putting the Upper Midwest in a southwest flow aloft and susceptible to seeing some rounds of showers/thunderstorms and possibly some heavy rainfall and or severe weather especially by next weekend or early the following week the way it looks now.

5 Day Forecast for Duluth/Superior

.Tonight... Mostly clear. Areas of fog developing. Low 53 to 58. Wind variable around 12 mph.

.Sunday... Areas of fog early, otherwise mostly sunny. High 76 to 81 but cooler closer to Lake Superior. Wind east to southeast at 5 to 15 mph.

.Sunday Night... Mostly clear. Low 58 to 63. Wind southeast to south at 5 to 15 mph.

.Monday... Partly cloudy. High 80 to 85.

.Monday Night... Showers or thunderstorms developing. Mostly cloudy. Low 60 to 65. Chance of rain 60%.

.Tuesday... Partly sunny. High 70 to 75.

.Tuesday Night... Mostly clear. Low 48 to 53.

.Wednesday... Mostly sunny. High 68 to 73.

Normal High Temperature Tomorrow 73 degrees

Normal Low Temperature Tomorrow 53 degrees

Tim