/Issued 4:21 PM CDT, Wednesday, August 21, 2013/
*Incredible visible satellite loop at 1 minute intervals showing the explosion of severe thunderstorms This Afternoon in Upper Michigan and in parts of Wisconsin and Minnesota. (Source, Twitter @BrewCityChaser)
*A still visible satellite image from 3 PM Today as thunderstorms blossomed along and ahead of a cold front which stretched from Northern Lake Superior to Western Wisconsin to Southern Minnesota late This Afternoon. (Source, Twitter @BrewCityChaser)
*Enhanced satellite loop showing the thunderstorms that formed while moving across Northern Minnesota early This Morning. (Source, Unisys weather) Note: Darker blue/green colors=colder cloud tops, heavier precipitation.
Rainfall report for August 21, 2013
Source: National Weather Service Duluth, Minnesota
Hibbing, MN: 0.34″
Cass Lake, MN: 0.15″
Dixon Lake, MN: 0.20″
Togo, MN: 0.44″
Babbitt, MN: 0.24″
Cook, MN: 0.22″
Embarrass, MN: 0.40″
*Rainfall map from early Today (August 21, 2013) Northern Minnesota did get some much needed rain, nothing for Duluth though. (Source, Midwest Regional Climate Center)
Today’s Weather Summary for Northeast Minnesota and Northwest Wisconsin
Scattered thunderstorms favored Northern Minnesota early This Morning with frequent lightning and heavy downpours. Scattered thunderstorms redeveloped This Afternoon over parts of Northwestern Wisconsin. These storms developed thanks to a fairly strong cold front (more of a dew point front) which was moving SE across the Northland Today. Speaking of those dew points, a much drier airmass continues to advect south out of Northern Minnesota late This Afternoon with 40s and 50s for that area, while steamy 60s and 70s prevailed in much of Northwest Wisconsin. Note: At the Duluth Airport the dew point dropped 20+ degrees between 11am (71F) and 3pm (50F) Today as that cold front moved through. Temperatures were very warm once again with highs mainly in the 80s to lower 90s. Winds shifted from the SW to the NNW at 10 to 25 mph.
Forecast Discussion for Northeast Minnesota and Northwest Wisconsin
Short Term Forecast – Confidence: High.
Tonight through Thursday Night (August 21-22)
Much better weather for sleeping Tonight and Tomorrow Night as low temperatures drop into the 40s and 50s, although a few spots in Eastern Minnesota and Northwest Wisconsin might stay in the low 60s Tonight. High temperatures Tomorrow will be in the 70s and 80s but with much lower dew points compared to recent days. Partly cloudy skies are forecast this period with a few showers and thunderstorms early Tonight in Northwest Wisconsin. High pressure will build into the Upper Midwest during the next 24 hours resulting in a very pleasant late summer airmass.
Extended Forecast – Confidence: High.
Friday through Sunday (August 23-25)
Dew points stay low on Friday while the weather remains dry and high temperatures climb into the 70s and 80s. Lows Friday Night will be in the 50s to lower 60s. Humidity returns this weekend as south winds develop on the backside of high pressure which shifts southeast into the Central/Eastern Great Lakes during the weekend. A few showers and thunderstorms could develop both Saturday and Sunday as a warm front/stationary front drapes itself across the Upper Midwest with plenty of moisture and instability developing near that boundary, but there’s also going to be a fairly stout cap (warm layer aloft) which could hinder thunderstorm development. High temperatures Saturday and Sunday will be in the 80s, possibly even some 90s on Sunday. It will be cooler though along the North Shore of Lake Superior.
Long Range Forecast – Confidence: High.
An upper level ridge of high pressure covers the Plains and Great Lakes with a SW flow aloft for the Western/Northern U.S. Disturbances/fronts along the west/north side of that upper ridge combined with an abundant supply of warm, moist and unstable air could lead to a couple episodes of showers and thunderstorms over parts of the Northland during this period. Above average temperatures are forecast from the 26th-31st.
*7-day rainfall forecast valid thru Wednesday, August 28, 2013. Still seeing signs of a wetter pattern in the Northland starting this weekend and continuing at times into next week. Will see what happens. (Source, Weather Prediction Center)
5 DAY FORECAST FOR DULUTH/SUPERIOR
.Tonight… Much less humid. Partly cloudy and cooler compared to recent nights. Low 55 to 60. Wind north to northwest at 10 to 20 mph.
.Thursday… Partly cloudy. High 76 to 81. Wind north to northwest at 10 to 20 mph.
.Thursday Night… Mostly clear. Low 50 to 55. Wind becoming east at 5 to 15 mph.
.Friday… Partly cloudy. High 75 to 80.
.Friday Night… Partly cloudy. Low 55 to 60.
.Saturday… Partly sunny. High 80 to 85.
.Saturday Night… Partly to mostly cloudy. Low 60 to 65.
.Sunday… Partly sunny. High 82 to 87.
Normal temperatures for Today
Sunrise Thursday: 6:16 AM CDT
Sunset Thursday: 8:06 PM CDT