/Issued 5:22 PM CDT, Thursday, May 31, 2018/
12z European model from May 31, 2018 — Temperature Anomaly Forecast for Friday afternoon.
18z NAM-Nest model from May 31, 2018
18z NAM-Nest model, Simulated Radar forecast valid from 7 PM Friday to 1 AM Sunday.
June Climate Averages for Duluth, Minnesota
Temperature: 60.1 degrees
Precipitation: 4.23 inches
Warmest June on record: 65.5 degrees in 1910
Coldest June on record: 53.0 degrees in 1917
Wettest June on record: 10.89 inches in 1874
Driest June on record: 0.11 inches in 1910
Average number of 80 degree days: 5
Normal High on the 1st: 67 degrees
Normal High on the 30th: 75 degrees
Normal Low on the 1st: 45 degrees
Normal Low on the 30th: 53 degrees
Astronomical Data for June
Sunrise on the 1st: 5:18 AM CDT
Sunrise on the 30th: 5:17 AM CDT
Sunset on the 1st: 8:55 PM CDT
Sunset on the 30th: 9:06 PM CDT
Note: Going into the final day of the month — May 2018 ranked as warmest May on record at Duluth, Minnesota with an average temperature of 57.5 degrees. It’s likely with the above average temperatures we had today that May 2018 won’t drop out of the number one ranking.
Mostly cloudy skies today in far northern and northeast Minnesota where some spotty rain showers have been occurred today, the rest of the area saw partly to mostly sunny skies. Highs on this final day of May 2018 were in the low 70s to near 80 degrees with cooler 60s in far northern Minnesota due to the thicker cloud cover and showers today.
The big weather story for the next few days will be much cooler temperatures. A cold front will pass through the Northland tonight with winds turning northeast behind this front. High pressure will build into Hudson Bay Canada for Friday and Saturday while low pressure approaches from the west. The pressure gradient will tighten between the high and low, and this will cause a gusty northeast wind especially near Lake Superior for Friday through at least Saturday morning, wind gusts from 20 to 30 mph are likely with some higher gusts possible.
925mb temperatures which ranged from +16 to +20C in northeast Minnesota and northwest Wisconsin late this afternoon will drop to +2 to +8C on Friday with the coolest readings near Lake Superior.
Lows tonight will be in the 40s and 50s with highs Friday holding in the 40s and 50s, but areas farther away from Lake Superior should make it into the 60s.
Rain is expected to move into western portions of the Northland late Friday night or Saturday morning with rain then advancing farther east Saturday afternoon. Rain should then continue Saturday evening before ending from SW-NE later Saturday night or Sunday morning the way it looks now. Low pressure and a rather strong upper level trough moving east out of the northern Plains will pass through the upper Midwest over the weekend and this will give us another round of rain. PWATS ahead of this system are expected to range from 1.25 to around 1.50 inches on Saturday so some heavier pockets of rainfall are possible.
Note: There should be a period of low clouds and possible fog/drizzle that moves inland off Lake Superior later this evening as the east wind develops, the low clouds should burn off Friday as drier air advects down the lake.
Forecast for Duluth and Superior
.Tonight… Turning breezy. Partly to mostly cloudy. Some fog or drizzle is possible from late evening into the overnight hours. Low 40 to 45. Wind north to northwest at 10 to 15 mph, becoming northeast at 15 to 30 mph before midnight.
.Friday… Breezy and cool. Mostly cloudy early followed by some clearing. High 47 to 52. Wind east to northeast at 15 to 30 mph.
.Saturday… Breezy and cool. Mostly cloudy. Rain developing especially during the afternoon. High 43 to 48. Wind east at 15 to 25 mph.
Normal Temperatures for June 1
Sunrise Friday: 5:18 AM CDT
Sunset Friday: 8:55 PM CDT