Chilly overnight and Sunday; frost possible in some areas

Temps gradually recover this week

Last weekend, we had Twin Cities highs in the mid 70s. The high temperature at Minneapolis-St. Paul International Airport this Saturday was 56 degrees. Our average high on May 21 is 71 degrees.

Our winds will lighten up as we go through Saturday night and the cloud cover will shrink. Temperatures will drop into the 30s across much of Minnesota and western Wisconsin overnight into early Sunday morning:

Forecast lows late Saturday night and early Sunday AM
National Weather Service

Minneapolis and St. Paul and the inner ring of suburbs may see lows close to 40 degrees, with 30s elsewhere in the Twin Cities metro area.

When winds are light, the temperature near the ground can be several degrees colder than the official temp which is measured 5 feet above the ground.

Frost advisories

The National Weather Service has issued frost advisories from 11 p.m. Saturday to 9 a.m. Sunday for the blue-shaded areas on the following maps:

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Frost advisory 11 p.m. Saturday to 9 a.m. Sunday
National Weather Service
Frost advisory (blue) and flood warning (green)
National Weather Service

The green-shaded areas in northern Minnesota have flood warnings plus frost advisories. Northwestern Minnesota is also in a frost advisory into mid morning on Sunday.

You can cover tender plants to protect them from frost, and small potted plants can be stored in a garage, apartment or house overnight.

You can hear updated weather information for Minnesota and western Wisconsin on the Minnesota Public Radio News network, and you can see updated weather info on the MPR News live weather blog.

Rainy River Basin flooding

Flood warnings (shaded green in the previous map) continue in the Rainy River Basin of northern Minnesota. Here are the details:

Flood Statement National Weather Service Duluth MN 304 PM CDT Sat May 21 2022 MNC071-075-137-252200- /O.CON.KDLH.FA.W.0011.000000T0000Z-220525T2200Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Koochiching MN-Lake MN-St. Louis MN- 304 PM CDT Sat May 21 2022 ...FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM CDT WEDNESDAY... * WHAT...Flooding caused by rain and snowmelt is occurring. Namakan Lake has already surpassed the level reached in the 2014 flood and is continuing to rise. Rainy Lake is expected to exceed the 2014 level. * WHERE...Portions of north central Minnesota and northeast Minnesota, including the following counties, in north central Minnesota, Koochiching. In northeast Minnesota, Lake and St. Louis. * WHEN...Until 500 PM CDT Wednesday. * IMPACTS...Lake level rises are ongoing. Flooding continues on areas lakes and rivers. Widespread impacts are ongoing for shoreline residents. * ADDITIONAL DETAILS... - At 301 PM CDT, Emergency management reported ongoing flooding across the warned area. - Lake inflows are slowing for Crane Lake, Kabetogama Lake and Namakan Lake. However... inflows still exceed outflows so rises will continue... especially on Rainy Lake. Lake levels on Namakan Lake are expected to rise 6 to 7 inches through May 27th with continued rises thereafter. Namakan Lake inflows are expected to decline but remain high for the remainder of the month. Rainy Lake is expected to rise 12 inches through May 27th. The 2014 level on Rainy Lake will be exceeded early this week and rises will continue at a slower rate beyond the 7 day forecast. Expect minimal rainfall amounts over the next 7 days. - Areas affected include Rainer, Island View, Voyageurs National Park, Crane Lake, Kabetogama Lake and Lake Vermilion. - PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don`t drown when encountering flooded roads. Most flood deaths occur in vehicles. Use extreme caution if venturing our on these water bodies as many hazards exist.

Here’s additional info on the flooding:

Flooding update for the Rainy River Basin
National Weather Service

Temperature trends

Sunday highs will be in the 50s in many locations:

Sunday forecast highs
National Weather Service

The Twin Cities metro area and some spots in southeastern Minnesota could creep slightly above 60.

Twin Cities metro area highs are projected to reach the lower 60s on Monday, followed by mid 60s Tuesday and Wednesday, then around 70 Thursday and lower 70s on Friday.

It looks like we could see scattered showers late Monday and also on Tuesday and Wednesday.

Programming note

You can hear my live weather updates on MPR News at 7:35 a.m., 9:35 a.m. and 4:39 p.m. each Saturday and Sunday.