Tuesday, May 25, 2010

5/25/10: Tuesday's Weather Report

Issued at 3:36 PM CDT, Tuesday, May 25th, 2010

Note: If the 85 degree high temperature that was reported in Duluth, MN Today is official, then we will have tied the record high temperature for the 25th of May which was last set in 1914!

Weather History:

On this date in 1992 and 1988, a record low temperature of 30 degrees occurred at Duluth, MN.

Here are some high temperatures that occurred on Monday, May 24th, 2010 across Northern Minnesota and Northwest Wisconsin. Source: NWS Duluth, MN.

Brainerd MN: 91 degrees

Hibbing MN: 88 degrees

Ely MN: 88 degrees

Orr MN: 88 degrees

Cook MN: 86 degrees

Grand Rapids MN: 88 degrees

Longville MN: 90 degrees

Pine River MN: 90 degrees

Aitkin MN: 88 degrees

Moose Lake MN: 90 degrees

Hinckley MN: 90 degrees

Ashland WI: 93 degrees

Hayward WI: 91 degrees

Siren WI: 92 degrees

Phillips WI: 91 degrees

Bruno MN: 91 degrees

Floodwood MN: 85 degrees

5 miles Northwest of Washburn WI: 91 degrees

Gordon WI: 93 degrees

Solon Springs WI: 93 degrees

Upson WI: 90 degrees

Weather tidbits:

*Record High Temperatures occurred at St. Cloud Minnesota (94 degrees) and the Twin Cities (95 degrees) on 5/24/10.

*St. James Minnesota and Cambridge Minnesota reported a high temperature of 97 degrees on Monday, May 24th, 2010!

Note: The National Weather Service in Duluth, MN issued it's first Tornado Warning for Spring 2010 on Monday Evening, May 24th. The tornado warning was issued for Northwest Koochiching County in Northern Minnesota, although no tornadoes were spotted, there was a report of 1.75" diameter hail at Loman MN (Koochiching County) at 9:40 PM CDT Monday Evening.

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

A cold front was located in Central Minnesota This Afternoon while an outflow boundary caused by last night's storms in Western-Southern Minnesota made it's way into Northern-Central Wisconsin Today. A drier and more stable airmass developed in wake of this outflow boundary across most of Northern-Eastern Minnesota Today where dewpoints dropped into the 40s and 50s while a much more humid and unstable airmass continued Today over most of Northwest Wisconsin with dewpoints This Afternoon in the 60s to around 70 degrees, PWS of 1.00"-1.60" along with CAPES from 1500-2500 j/kg and Lifted Indices of -3/-6 degrees C. Scattered showers and thunderstorms have been developing across Northwest Wisconsin Today with movement toward the north-northwest. A few of these storms have turned severe at times This Afternoon with reports of high winds and hail. These storms Today have also been prolific rain and lightning producers. High temperatures Today were in the 80s to around 90 degrees, but temperatures fell into the 70s in the rain cooled air across parts of Northwest Wisconsin. The marine layer also continued Today at the head of Lake Superior with temperatures in the 50s and 60s, areas of thick fog also occurred at times Today with visibilities down to 1/4 mile or less from time to time.

There's been some interesting things going on near the Twin Ports Today. One, the lake breeze front was shifting east through Southern St. Louis/Carlton Counties This Afternoon, but as this boundary moved toward Proctor/West Duluth around 3:30 PM it stopped and was actually getting pushed back a bit toward the west now thanks to an area of thunderstorms that was moving through the South Shore of Lake Superior which is helping to reinforce the marine layer to some extent. Second, there's been an outflow boundary shifting northwest across Northern Wisconsin Today, this OFB as of 3:51 PM CDT stretched from Northern Bayfield County through Central Douglas County in Northwest Washburn County in Northwest Wisconsin with movement toward the NW! This OFB has collided with the lake breeze front in Central Douglas County late Today, and new thunderstorms have been erupting just east of this boundary!

Mostly sunny skies covered Northern-Northeast Minnesota Today while clouds were more extensive across Northwest Wisconsin. Winds Today were out of the south, east, or north generally under 20 mph.

Today's 500 mb analysis:

Strong upper level low (552 meters) was centered in Southern Saskatchewan Province This Afternoon per RUC model analysis with movement toward the north. A S-SW flow aloft continued Today over the Upper Midwest out ahead of an upper level trough across the Western U.S. An upper level ridge (588 meters) continued to cover portions of the Central-Eastern Great Lakes as well as parts of Eastern Canada and the Northeast U.S. Today.


Scattered showers and thunderstorms will continue This Evening across portions of Northwest Wisconsin and the Arrowhead of Minnesota...Generally affecting areas from Forest Center to Castle Danger in Minnesota and off to the northeast. A few of these storms could be strong to severe with hail up to 1" in diameter and wind gusts from 40-60 mph! Heavy downpours and dangerous lightning strikes will also occur with this activity This Evening. By late Tonight, the cold front which was over Central Minnesota This Afternoon will head slowly east, this boundary could cause a few more showers or thunderstorms Overnight, mainly in Northwest Wisconsin and possibly back toward the Twin Ports and Eastern Minnesota. Partly-mostly cloudy skies will cover our area Tonight with lows in the 50s and 60s with some 40s possible at the head of Lake Superior where areas of dense fog could linger at times. Winds Tonight will be out of the south, west, or east under 15 mph.

Wednesday and Wednesday Night:

A cold front will exit Northwest Wisconsin Tomorrow Morning, then high pressure will build into the area from the Northern Plains. Showers and possibly an isolated thunderstorm could continue Wednesday Morning in Northwest Wisconsin, then look for generally dry conditions throughout Northern Minnesota and Northwest Wisconsin from Wednesday Afternoon into Wednesday Night. Highs Tomorrow will be in the 70s and 80s with much lower dewpoints compared to the last few days. Lows Tomorrow Night will be in the 40s and 50s. Winds during this period will be out of the north or west under 20 mph.

Extended Forecast:

Dry weather is expected in our area for Thursday through Saturday as an upper level ridge of high pressure re-develops over the Upper Midwest and Central Plains. High temperatures will be in the 70s and 80s for Thursday and Friday with cooler temperatures at times closer to Lake Superior. Lows Thursday Night and Friday Night will be in the 40s and 50s. An area of low pressure and it's associated warm front and cold front is expected to move east out of the Northern Rockies/Northern Plains this weekend. This system could bring some showers or thunderstorms to our local area sometime during the Sunday-Monday time period. The forecast models Today are not in very good agreement on the overall timing of this system, so it remains to be seen when exactly our best shot of rain will occur.

5 Day Forecast for Duluth/Superior

.Tonight... Isolated showers or thunderstorms possible. Partly to mostly cloudy. Areas of dense fog at times mainly closer to Lake Superior. Low 50 to 55. Wind southwest at 5 to 15 mph Inland with east winds at 5 to 15 mph closer to Lake Superior. A period of strong winds with gusts to 40 mph may occur through 5 PM.

.Wednesday... Partly cloudy. High 73 to 78. Wind west to northwest at 10 to 20 mph.

.Wednesday Night... Mostly clear. Low 48 to 53. Wind northwest at 5 to 15 mph.

.Thursday... Mostly sunny. High 72 to 77.

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

.Friday... Mostly sunny. High 70 to 75 but cooler near Lake Superior.

.Friday Night... Partly cloudy. Low 48 to 53.

.Saturday... Partly cloudy. High 70 to 75.

Normal High Temperature Today 67 degrees

Normal Low Temperature Today 43 degrees