/Issued 5:10 PM CDT, Thursday, September 14, 2017/
Source: https://www.tropicaltidbits.com/
18z NAM
Source: http://www.weather.gov/crh/
It’s not unusual at all to see snow in the northern Rockies in September, but this is the first significant snow event of the fall season for portions of Montana and Wyoming — Pink areas are winter storm warnings; Blue is a winter storm watch; while a freeze warning is in effect for parts of southern Oregon!
Source: https://www.weatherbell.com/
Minnesota radar loop ending ~5 PM, September 14, 2017. Note: The blue polygons that pop up in far northern Minnesota are severe thunderstorm warnings.
Source: http://weather.cod.edu
Visible satellite loop through 3:45 PM CDT, Thursday, September 14, 2017. Two things — One is the explosion of severe thunderstorms in far northern Minnesota (shows up as 3 blobs on this image) The other is the persistent low clouds/fog near the head of Lake Superior today thanks to the easterly flow off the lake.
Source: http://kamala.cod.edu/SPC/
Source: http://kamala.cod.edu/SPC/
Source: http://www.spc.noaa.gov
Surface analysis from earlier this afternoon — A big temperature contrast between the northern Rockies and upper Midwest today with upper 30s and 40s over parts of Montana while much of central and southern Minnesota were in the 80s to lower 90s this afternoon.
Note: Duluth, Minnesota had its 2nd warmest high temperature, and 2nd warmest low temperature on record for September 13, 2017 — See lists below.
Top 5 warmest high temperature for September 13
1: 84 degrees set in 1990
2: 82 degrees set in 2017
3: 81 degrees set in 1981
4: 80 degrees set in 2009, 2004 and 1952
5: 78 degrees set in 1931
Top 5 warmest low temperature for September 13
1: 63 degrees set in 1877
2: 61 degrees set in 2017 and 1992
3: 60 degrees set in 1994, 1931 and 1882
4: 59 degrees set in 1901
5: 58 degrees set in 1939, 1927, 1897, 1893 and 1883
Note: International Falls, Minnesota had a top 5 warmest high temperature and warmest low temperature on record for September 13, 2017 — See lists below.
Top 5 warmest high temperature for September 13
1: 89 degrees set in 1952
2: 84 degrees set in 1969 and 1920
3: 81 degrees set in 2006 and 1897
4: 79 degrees set in 2017 and 2009
5: 78 degrees set in 2015, 2004, 1971 and 1911
Top 5 warmest low temperature for September 13
1: 61 degrees set in 2004 and 1952
2: 59 degrees set in 1997
3: 57 degrees set in 1994 and 1909
4: 56 degrees set in 2017, 1967, 1916 and 1914
5: 55 degrees set in 1912
Weather Synopsis
A large temperature contrast was in place over the Northland today thanks to a cold frontal boundary which extended from Lake Superior back to north central and west central Minnesota late this afternoon. Temperatures near and south of that front ranged from the mid 80s to low 90s this afternoon while north of this front and also along the North Shore of Lake Superior temperatures were in the 60s today. It was also another muggy day with dew points in the 60s over east central Minnesota and northwest Wisconsin. Low clouds and fog which developed early this morning lingered most of the day close to Lake Superior while skies ranged from mostly cloudy over northern Minnesota to mostly sunny in eastern Minnesota and northern Wisconsin late this afternoon. Showers and thunderstorms have erupted this afternoon over far northern Minnesota on the north side/cool side of the frontal boundary with several of these storms severe warned with potential for large hail quarter size to half dollar size along with damaging wind gusts to 60 mph.
The weather setup through Saturday evening will change very little. A frontal boundary will remain over the upper Midwest and not exit to the south/east until Sunday morning. Warm, moist and unstable air will be found near and south of this front with much cooler air north of the front. Showers and thunderstorms will develop at times through Saturday night across northeast Minnesota and northwest Wisconsin. Periods of steeper mid level lapse rates combined with sufficient elevated instability will combine with stronger winds aloft to produce a risk for a few strong to severe thunderstorms in parts of the Northland tonight, Friday and again on Saturday. There will also be heavy rainfall near these storms with localized flooding possible if storms begin to train over the same location for a few hours.
Note: The greatest potential for storms tonight looks to remain along and north of Highway 2 in northeast Minnesota. The threat for thunderstorms will extend farther south to include east central Minnesota and northwest Wisconsin for Friday afternoon and Friday night, with the entire Northland under the gun for showers and thunderstorms Saturday into Saturday night as the main upper level trough and low pressure swings through the region from SW-NE.
Lows tonight will be in the 50s and 60s with highs Friday in the 50s and 60s near Lake Superior and over northern Minnesota to the 80s over east central Minnesota and northwest Wisconsin.
Note: With the humid flow off Lake Superior the potential for low clouds and fog will continue along the North Shore and South Shore of Lake Superior tonight and Friday.
Forecast for Duluth and Superior
.Tonight… Low clouds and fog possible. A few showers possible. Low 57 to 61. Wind east at 10 to 20 mph.
.Friday… Low clouds and fog possible. Mostly cloudy. Occasional showers or thunderstorms possible. High 61 to 65. Wind east at 10 to 20 mph.
.Saturday… Mostly cloudy. Occasional showers or thunderstorms possible mainly later in the day. High around 70. Wind variable in direction.
.Sunday… Partly to mostly cloudy. High near 60. Wind west at 10 to 20 mph.
Normal temperatures for Friday
High: 65
Low: 46
Sunrise Friday: 6:47 AM CDT
Sunset Friday: 7:20 PM CDT
Tim
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