Wednesday, July 21, 2010

7/21/10: Wednesday's Weather Report

Issued at 8:17 PM CDT, Wednesday, July 21st, 2010

Rainfall totals across Northern Minnesota from Tuesday, July 20th, 2010. Source: NWS Duluth, Minnesota.

St. Louis County:

Duluth MN: 0.14"

Hibbing MN: 0.28"

Cook MN: 0.13"

Embarrass MN: 0.36"

Koochiching County:

Northome MN: 0.27"

Cook County:

Grand Marais MN: 0.37"

Grand Portage MN: 0.26"

Forecast Discussion for Northeast Minnesota and Northwest Wisconsin

Today's Weather:

Mostly sunny skies covered our area Today with high temperatures in the upper 70s to low/mid 80s along with tolerable amounts of humidity as dewpoints were generally in the 55-64 degree range with early Evening PWS of 1.00" around the Brainerd Lakes/Pine City-Hinckley area, east to the Siren/Grantsburg area in Northwest Wisconsin with 0.70"-0.90" PWS across Northern Minnesota and the rest of Northwestern Wisconsin. Winds Today were out of the west or northwest under 20 mph. Surface map as of 8 PM featured high pressure of 1019 mb centered over Southwest Wisconsin while a warm front was draped across the Central Plains with low pressure of 1008 mb across the Western High Plains.

This Evening's Upper Level Analysis:

500 mb flow was beginning to transition a bit from the W/NW to the W/SW This Evening as an upper level trough begins to take shape across the Northern Rockies. Upper level ridge (5940 meters) covered the Southern-Southeast U.S. This Evening per RUC model analysis while a vigorous upper level low/upper trough (5700 meters) progresses east through Quebec Province/Northeast U.S.


Partly to mostly cloudy skies will be found in Northern Minnesota and Northwest Wisconsin as high pressure continues to push off to our southeast while a warm front remains well to our south during the night. Warm/moist advection occurring north of that boundary will fuel multiple clusters of showers and thunderstorms with a heavy rain/severe threat Tonight from South Dakota through portions of Nebraska, Iowa and Southcentral Minnesota. Additional showers should develop in Southern parts of our area late Tonight, mainly south of a line from Walker Minnesota to Hayward Wisconsin. Lows Tonight will be in the 50s and 60s with winds becoming southeast to east under 15 mph.

Thursday and Thursday Night:

Cooler temperatures will occur on Thursday as our local area sits north of a warm front which will reach a Southern Minnesota to Central Wisconsin line by late Thursday Afternoon. E/SE surface winds will occur to the north of this front and this combined with quite a bit of low level moisture surging north into our area with dewpoints mainly in the 60s, 850 mb td's of +10/+16 degrees C, and PWS from 1.25"-1.75" will lead some areas of rain and rain showers in Northern Minnesota and Northwest Wisconsin Tomorrow and Tomorrow Night. With the abundant moisture in place, some of these showers could be locally heavy. Scattered thunderstorms are also possible Tomorrow and Tomorrow Evening, but severe weather is not expected in our area due to the cool/overcast conditions north of the warm front which will help limit the amount of warmth and instability around here. Highs Tomorrow will be in the 60s and 70s with lows Tomorrow Night in the 50s and 60s. Winds Thursday will be out of the east or southeast at 10-20 mph with a few higher gusts possible thanks in part to a strengthening SE 850 mb jet of 30-45 knots during the day. Winds Tomorrow Night will be out of the east, north or southwest under 20 mph.

Extended Forecast:

A stationary front will remain in the general vicinity from Southern Minnesota to Central Wisconsin from Friday into early Saturday as one low pressure disturbance exits to our east by early Friday while another one moves from the Northern Plains into the Upper Midwest from Friday into Saturday. Some additional showers or isolated thunderstorms will be possible Friday and Saturday across Northern Minnesota and Northwest Wisconsin, but severe weather is not expected around this area either day. Highs Friday and Saturday will be mainly in the 70s, but 60s if clouds are more extensive. Lows Friday Night and Saturday Night will be in the 50s and 60s. Looks like will get a break in the cool, showery weather for Sunday and Monday with temperatures moderating as well. The next threat for showers/thunderstorms will come sometime Tuesday or the middle of next week.

5 Day Forecast for Duluth/Superior

.Tonight... Partly to mostly cloudy. Low 58 to 63. Wind becoming east to southeast at 5 to 15 mph.

.Thursday... Cooler. Mostly cloudy with occasional rain or rain showers. High 67 to 72. Wind east to southeast at 10 to 20 mph. Chance of rain 60%.

.Thursday Night... Mostly cloudy. Showers possible, especially during the Evening. Low 58 to 63. Wind southeast at 5 to 15 mph becoming west. Chance of rain 50%.

.Friday... Partly sunny. Showers possible. High 70 to 75. Chance of rain 20%.

.Friday Night... Mostly cloudy. Showers possible. Low 55 to 60. Chance of rain 30%.

.Saturday... Mostly cloudy. Showers possible. High 70 to 75. Chance of rain 30%.

.Saturday Night... Partly to mostly cloudy. Low 55 to 60.

.Sunday... Partly cloudy. High 75 to 80.

Normal High Temperature Tomorrow 77 degrees

Normal Low Temperature Tomorrow 55 degrees