Monday, May 24, 2010

5/24/10: Monday's Weather Report

Issued at 3:55 PM CDT, Monday, May 24th, 2010

...Record Event...

3.93" of rain fell at Duluth, Minnesota on Sunday, May 23rd, 2010 which was a record for the day and for the month of May. The previous 24 hour rainfall record for the 23rd of May was 1.28" set in 1964. The previous monthly record for May was 3.02" which was set on May 22nd, 1884!

Here are the storm reports across Northern-Eastern Minnesota from Sunday Evening and Monday Morning, May 23rd-24th, 2010. Source: NWS Duluth, MN.

10:32 PM CDT 5/23/10: Willow River MN (Pine County) 0.88" diameter hail

1034 PM CDT 5/23/10: Moose Lake MN (Carlton County) 0.75" diameter hail

1:46 AM CDT 5/24/10: Emily MN (Crow Wing County) 0.75" diameter hail

2:05 AM CDT 5/24/10: 5 miles Southeast of Grand Rapids MN (Itasca County) 1.00" diameter hail

2:42 AM CDT 5/24/10: Coleraine MN (Itasca County) 0.50" diameter hail

3:00 AM CDT 5/24/10: Bowstring MN (Itasca County) 0.75" diameter hail

3:52 AM CDT 5/24/10: Nashwauk MN (Itasca County) 1.00" diameter hail

4:00 AM CDT 5/24/10: Big Falls MN (Koochiching County) 0.75" diameter hail, Dime size hail lasted for about 10 minutes.

5:07 AM CDT 5/24/10: Soudan MN (St. Louis County) 1.50" diameter hail. Lots of hail, most was 1.00" in diameter. Damage to vehicles and skylights. Trees stripped of leaves.

Here are some rainfall reports from Sunday, May 23rd, 2010. Source: NWS Duluth, MN

Duluth MN: 3.93"

Hibbing MN: 0.37"

Cook MN: 2.18"

Northome MN: 0.21"

8 miles South of Bigfork MN: 0.61"

2 miles South of Tower MN: 1.50"

Embarrass MN: 0.55"

Littlefork MN: 0.23"

7 miles Northwest of Two Harbors MN: 1.33"

Here are some high temperatures from Sunday, May 23rd, 2010 from Northern Minnesota and Northwest Wisconsin. Source: NWS Duluth, MN.

International Falls MN: 85 degrees

Brainerd MN: 83 degrees

Hibbing MN: 84 degrees

Cook MN: 84 degrees

Orr MN: 88 degrees

Aitkin MN: 82 degrees

Ashland WI: 82 degrees

Siren WI: 85 degrees

2 miles South of Tower MN: 82 degrees

Littlefork MN: 85 degrees

Hinckley MN: 83 degrees

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

Hot/muggy weather covered most of our area Today with high temperatures topping out in the 80s to lower 90s while dewpoints were in the 60s to around 70 degrees! Heat indices were in the upper 80s to middle 90s This Afternoon in Western-Southern parts of our local area. A marine layer persisted through the day around the head of Lake Superior where high temperatures didn't get out of the 50s, there's also been very thick fog at times with visibilities down to around zero from time to time. Winds Today were out of the south or east at 10-20 mph with some higher gusts. Surface map This Afternoon featured strong low pressure of 992 mb centered in Western Nebraska with a warm front extending northeast of this low through Northcentral Minnesota.

Today's 500 mb analysis:

Vigorous negative tilted trough was surging N/NE through the Northern Rockies-Western High Plains This Afternoon per water vapor satellite imagery. South-southwest flow aloft was in place over the Upper Midwest Today out ahead of this storm while an upper level ridge of high pressure (588 meters) covered the Great Lakes and Mid-Mississippi Valley region.

Tonight:

Potent area of low pressure will continue to lift north through the Western Dakotas Tonight while a warm front continues it's northward track through Northern Minnesota. The atmosphere is very unstable in our local area Today but it is also capped. Scattered strong to severe thunderstorms which developed early this Morning through late this Morning across Northern Minnesota have lifted north into Ontario Province late Today and further development is not expected for the majority of our immediate area Tonight due to the warm mid level temperatures in place...With that said, a few showers and thunderstorms could clip Western-Northwest parts of our area Tonight, generally west of a line from International Falls to Walker, any storm that manages to develop in these areas could be severe with the ample CAPE in place along with some rather good shear. Large hail and damaging winds would be the main threats along with torrential rain and dangerous lightning, an isolated tornado risk also exists This Evening. Partly-mostly cloudy skies will cover our area Tonight with areas of dense fog, especially near Lake Superior where visibilities could drop to zero at times. Lows Tonight will be unseasonably warm with 60s to around 70 degrees, but 50s will be common near Lake Superior. Winds Tonight will be out of the south or east at 10-20 mph.

Tuesday and Tuesday Night:

Low pressure lifts north into Central Canada while a cold front extending southwest of this low settles east into our local area during this period. The atmosphere will continue to be very moist and unstable out ahead of this boundary and as a result from this we should see scattered showers and thunderstorms develop Tuesday Afternoon through Tuesday Night. The overall severe threat is limited during this period due to weak upper level winds and marginal amounts of shear in place, but an isolated risk for severe thunderstorms capable of producing large hail and damaging winds does exist Tomorrow Afternoon-Evening across Eastcentral Minnesota-Northeast Minnesota and Northwest Wisconsin due to the high amounts of instability that are forecast to be in place. Dangerous lightning and torrential rainfall could also occur with localized flooding possible where storms develop and move over the same locations. Highs Tomorrow will be in the 80s to lower 90s with 50s and 60s closer to Lake Superior where areas of dense fog could persist on Tuesday. Lows Tomorrow Night will be in the 50s and 60s. Winds will be out of the south, east, or west during this period at 10-20 mph.

Extended Forecast:

A cold front will exit Northwest Wisconsin early Wednesday the way it looks now, there could be some additional showers or thunderstorms on Wednesday...Mainly in Northwest Wisconsin, the rest of our area should be dry on Wednesday with lowering humidity along with a wind shift to the west. Highs on Wednesday will be in the 70s and 80s with lows Wednesday Night in the 40s and 50s. Dry conditions are forecast across Northern Minnesota and Northwest Wisconsin for Thursday with highs in the 60s and 70s with lows Thursday Night in the 40s and 50s.

5 Day Forecast for Duluth/Superior

.Tonight... Muggy. Areas of dense fog. Mostly cloudy. Low 58 to 63, but around 50 closer to Lake Superior. Wind southeast at 10 to 15 mph.

.Tuesday... Muggy. Scattered showers or thunderstorms developing, mainly during the Afternoon. Locally heavy rainfall is possible. Variable cloudiness with areas of dense fog at times, especially near Lake Superior. High 75 to 80 but cooler near Lake Superior. Wind south to southeast at 10 to 20 mph. Chance of rain 40%.

.Tuesday Night... Scattered showers or thunderstorms, mainly during the Evening. Locally heavy rainfall is possible. Mostly cloudy with areas of fog. Low 55 to 60. Wind becoming north at 5 to 15 mph. Chance of rain 40%.

.Wednesday... Less humid. Partly sunny. High 75 to 80.

.Wednesday Night... Partly cloudy. Low 50 to 55.

.Thursday... Partly cloudy. High 72 to 77.

.Thursday Night... Mostly clear. Low 45 to 50.

.Friday... Partly cloudy. High 68 to 73 but cooler near Lake Superior.

Normal High Temperature Today 66 degrees

Normal Low Temperature Today 43 degrees

Tim