Tuesday, July 27, 2010

7/27/10: Tuesday's Weather Report

Issued at 8:02 PM CDT, Tuesday, July 27th, 2010

...All headlines issued by the National Weather Service Duluth, Minnesota...

Weather tidbits:

*1, possibly 2 people were struck by lightning in Duluth Minnesota late This Afternoon.

*The Aerial Lift Bridge in Duluth Minnesota was struck by lightning late Today which caused the bridge to stay up for over an hour. As of 8 PM, the lift bridge was back up and running.

*Reports of large hail and areas of wind damage around the Twin Ports with the severe thunderstorms that moved thru the city around 5 PM Today.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

Scattered showers and thunderstorms some of which were severe developed late last night over Eastern North Dakota with even a report of a tornado near Fargo North Dakota around 2 AM last night...This activity moved through Western-Southern parts of our local area This Morning with a few severe thunderstorm warnings issued for parts of Cass, Crow Wing and Aitkin Counties Minnesota before 9 AM.

A persistent band of scattered showers and a few thunderstorms lingered most of the day in a west-east band across Central-Southern parts of our area which kept the greatest instability/moisture/and warm air a bit more south then what was forecasted 24 hours ago thanks to the extra cloud cover and scattered precipitation.

In the end the amount of clouds and precip really didn't have much affect on what happened late Today as scattered strong to severe thunderstorms erupted over portions of Eastcentral Minnesota with a line of strong to severe thunderstorms continuing to push south-east across Northwestern Wisconsin This Evening. The main threats out of the storms late Today have been from large hail and damaging winds along with torrential rainfall which has led to some localized flooding problems. Dangerous cloud to ground lightning strikes have also been occurring with these storms late Today. The threat for tornadoes never really did materalize This Afternoon due to the storms lining out rather quickly instead of remaining individual supercells.

Mostly cloudy to partly sunny skies covered our local area Today with high temperatures running in the 70s, but middle and upper 80s were common in Southern areas. Dewpoints Today were in the 65-70 degree range with PWS from 1.30-2.10"! Winds Today were out of the south or east under 20 mph. Surface map as of 7 PM featured a cold front which extended from Western Lake Superior into Northwest Wisconsin to Southern Minnesota.

This Evening's Upper Level Analysis:

A vigorous upper level trough was moving east into Central Canada This Evening per water vapor satellite imagery. A westerly flow aloft was in place over the Upper Midwest downstream of this system with a 100 knot upper level jet located over Western Ontario Province per RUC model analysis along with a widespread area of 30-60 meter 12 hour 500 mb height falls over the Upper Midwest and Central Canada.

Tonight:

*Tornado Watch* continues until 11 PM CDT for Ashland, Iron, Washburn, Sawyer and Price Counties in Northwest Wisconsin...

*Urban and Small Stream Flood Advisory* is in effect until 11 PM CDT Tonight for Central Aitkin, Eastcentral Crow Wing, Carlton, Southeast St. Louis and Northwest Douglas Counties.

*Urban and Small Stream Flood Advisory* is in effect until 1:45 AM CDT Wednesday for Eastern Pine, Southern Ashland, Southern Bayfield, Northern Burnett, Southern Douglas, Iron, Northwest Sawyer and Northern Washburn Counties.

A cold front will exit Northwest Wisconsin before Midnight. The threat for showers and thunderstorms, severe weather, and heavy rainfall will end from northwest to southeast through Midnight as this boundary exits the area. Partly-mostly cloudy skies will be found across Northern Minnesota and Northwest Wisconsin Tonight with lows in the 50s and 60s along with lowering humidity by dawn. Winds will shift to the north and west at 10-20 mph.

Wednesday and Wednesday Night:

A much quieter weather pattern will take over during this period as high pressure builds east out of the Northern Rockies. Partly-mostly sunny skies with highs in the 70s and 80s along with much lower humidity can be expected on Wednesday with mostly clear skies Wednesday Night with lows mainly in the 50s. Winds will be out of the northwest or west at 10-25 mph Tomorrow and under 15 mph Tomorrow Night.

Extended Forecast:

The period from Thursday through early next week will be highlighted by a W/NW flow aloft across the Upper Midwest with an upper level ridge of high pressure centered well to our south. A couple of fast moving low pressure systems/disturbances embedded within this fast W/NW 500 mb flow will pass through the Northern Plains and Upper Midwest on occasion, and those systems could bring occasional shower/thunderstorm clusters to portions of Minnesota from Thursday into early next week. At this time it appears that the greatest threat for seeing this activity will be to our west-south at least through Saturday. High temperatures Thursday and Friday will be in the 70s to around 80 degrees with lows in the 50s and 60s both nights.

5 Day Forecast for Duluth/Superior

*URBAN AND SMALL STREAM FLOOD ADVISORY* IN EFFECT UNTIL 11:00 PM CDT TONIGHT.

.Tonight... Skies becoming partly cloudy. Turning less humid. Low 58 to 63. Wind becoming west at 10 to 20 mph.

.Wednesday... Breezy and less humid. Partly cloudy. High 77 to 82. Wind west at 15 to 25 mph.

.Wednesday Night... Mostly clear. Low 53 to 58. Wind northwest at 10 to 15 mph.

.Thursday... Partly cloudy. High 75 to 80.

.Thursday Night... Partly cloudy. Low 53 to 58.

.Friday... Partly sunny. High 73 to 78.

.Friday Night... Partly to mostly cloudy. Low 56 to 61.

.Saturday... Partly sunny. High 75 to 80.

Normal High Temperature Tomorrow 77 degrees

Normal Low Temperature Tomorrow 56 degrees

Tim