/Issued 8:22 PM CDT, Saturday, May 27, 2017/
18z HRRRX model.
Weather Tidbits for Duluth, Minnesota
*Today's (May 27th) high of 75 degrees is the warmest temperature since September 11 (76 F)
*Today (May 27th) marks the 4th time this month with a high temperature of at least 70 degrees, but this will likely be the last 70 degree temperature we get for the rest of this month.
*5 days at or above 70 F so far this year (Thru May 27th) 9 days at or above 70 F last year thru May 27th.
The main feature that will affect us through Tuesday will be an upper level low pressure system which will move east/southeast out of Manitoba through Monday before it exits slowly off to the east on Tuesday.
This system will bring some showers to northeast Minnesota and northwest Wisconsin tonight and Sunday morning, then as daytime heating occurs, the risk for thunderstorms will increase Sunday afternoon into the early evening hours. Colder temperatures aloft along with steepening mid level lapse rates will move into our area Sunday with CAPE projected to be in the 200-800 j/kg range. Should be a favorable setup for scattered convection with isolated strong thunderstorms possible Sunday afternoon.
The risk for thunderstorms decreases Memorial Day with little to no instability forecast in our area but showers are expected to continue at times.
Lows tonight in the 40s and 50s. Highs Sunday mainly in the 60s. Highs Memorial Day cooling off into the 50s with a few locations in far southern parts of the area close to 60 degrees.