Showers and thunderstorms at times Monday and Monday night, with a severe storm possible

Twin Cities NWS radar to be taken out of service this Monday, due to a planned upgrade

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Our official Twin Cities high temp on Sunday was only 62 degrees. That isn’t even close to our average Sept. 8 high of 75 degrees.

Temperature trends

Monday highs could range from 60s and a few upper 50s in northern and central Minnesota to the lower 70s in the far south:

Monday forecast highs
National Weather Service

Tuesday will probably be the warmest day of this week, with highs reaching the 80s in far southern Minnesota:

Tuesday forecast highs
National Weather Service

We could touch 80 degrees Tuesday afternoon in the Twin Cities metro area. Metro area highs are projected to reach the mid-to-upper 70s on Wednesday and Thursday, followed by upper 60s on Friday.

Showers and thunderstorms at times

Minnesota and western Wisconsin will see some showers and thunderstorms at times as we go through Monday and Monday night.

The National Oceanic and Atmospheric Administration's North American Mesoscale forecast model shows the potential rain pattern Monday and Monday evening:

NOAA NAM simulated radar Monday through Monday evening

It’ll rain in some areas that look dry in the loop, but the loop illustrates the general rain pattern. As always, updated weather information can be heard on the Minnesota Public Radio Network, and you’ll also see updated weather info on the MPR News live weather blog.

The National Weather Service Storm Prediction Center shows a slight risk of severe weather Monday and Monday night for far southern Minnesota, with a marginal risk of severe weather extending through portions of southern and central Minnesota and western Wisconsin. The NWS Twin Cities office posted these details of the Monday/ Monday night severe weather outlook:

Severe weather outlook for Monday and Monday night
National Weather Service

“Tomorrow” in the graphic refers to Monday. The severe weather outlook will be updated by the NWS early Monday morning.

There’ll be additional rounds of showers and thunderstorms Wednesday and Thursday. Many parts of Minnesota and western Wisconsin could see 2 to 4 inch rain totals from today through late Thursday.

Starting on Monday, the Twin Cities NWS doppler radar will be offline for 3 weeks

There’s never a real good time to take a radar offline, but it has to be done periodically to keep the equipment functional. Duluth NWS radar was taken out of service for several days in August for a major upgrade. Now it’s time to upgrade the Twin Cities NWS doppler radar in Chanhassen:

Here are some details about the radar upgrade::

Twin Cities National Weather Service

According to the National Weather Service:

This is one of four major upgrades, known as service life extension projects (SLEP), planned to replace and refurbish major components of the 20+ year old WSR-88Ds and to keep the radars operational into the 2030s.

The NWS explained how storms will be monitored while the NWS doppler radar in Chanhassen is out of service:

During the outage, radar coverage is available from adjacent radar sites including Duluth, MN; La Crosse, WI; Des Moines, IA; Sioux Falls, SD; Aberdeen, SD; Grand Forks, ND; and the Minneapolis Terminal Doppler Weather Radar (TMSP TDWR).

Are you curious about what’s involved in the upgrade? Here’s a time-lapse of the pedestal replacement that was done to the NWS radar in Pendleton, Oregon: