Updraft® - Minnesota Weather News

Steamy and stormy: Timing weekend storm chances

Excessive heat warning Friday; heavy rainfall threat Saturday

lightning
Lightning in a thunderstorm.
NOAA

Recipe for a Minnesota July weekend: One part heat, two parts humidity, a dash of thunder, a generous splash of heavy rainfall.

We’ll experience all of the above this weekend. The excessive heat warning kicks in for the greater Twin Cites area at noon Friday.

Excessive heat warning Friday
Excessive heat warning Friday
Twin Cities National Weather Service

Timing weekend thunderstorms

A few scattered thunderstorms will favor western into central Minnesota Friday night and Saturday nights. A few models suggest thunderstorms could reach the Twin Cities early Friday morning.

Another wave of storms will likely move from the eastern Dakotas Friday night into Saturday morning. The storm threat favors the Twin Cities late Saturday afternoon through evening.

NOAA’s NAM 3 km resolution model captures the essence of chaotically scattered storm clusters this weekend.

NOAA NAM 3 km model from 1 am Friday through midnight Sunday
NOAA NAM 3 km model from 1 a.m. Friday through midnight Saturday night/Sunday.
NOAA via tropical tidbits

Don’t take coverage and timing in the above model loop as gospel, but use it to get a sense for the thunder threat.

Heavy rainfall threat

The highest threat zone for heavy, flooding rainfall appears to favor central Minnesota and possibly areas near the Twin Cities this weekend.

Excessive rainfall and flash flood risk areas
Excessive rainfall and flash flood risk areas Saturday night.
Twin Cities National Weather Service

Stay alert for storms late Saturday that could produce flooding rains.