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Continued Unsettled Pattern

Yesterday, we had a high of 55° and a low of 42°. I haven’t emptied my rain gauge yet; I will post later this morning.

This week, we will continue to see a daily risk of showers. We’ll start out on the mild side before temperatures cool off later in the week. After Wednesday, we could even see some of the first snowflakes of the season.


Weather History

1930: Record late-season warmth was across Lower Michigan with highs of 74 degrees at Grand Rapids and Lansing.

On November 19, 1953, this started a two-day streak of record highs in Flint with a temperature of 70 degrees on the 19th and 68 degrees on the 20th.


NWS Forecast

Today
Showers, mainly before noon. High near 62. Southeast wind 10 to 15 mph becoming west-southwest in the afternoon. Winds could gust as high as 29 mph. The chance of precipitation is 80%—new precipitation amounts of less than a tenth of an inch possible.
Tonight
Mostly cloudy, with a low of around 41. West southwest wind 5 to 7 mph becoming calm after midnight.
Wednesday
Showers, mainly after 7 am. High near 48. Light west wind becoming west northwest 9 to 14 mph in the morning. Winds could gust as high as 26 mph. The chance of precipitation is 90%—new precipitation amounts between a tenth and a quarter of an inch possible.
Wednesday Night
Rain showers before 10 pm, then rain and snow showers. Low around 33. West wind 11 to 14 mph, with gusts as high as 23 mph. The chance of precipitation is 100%. Little or no snow accumulation is expected.
Thursday
Rain, possibly mixed with snow showers, becomes all rain after 1 pm. High near 40. West wind around 14 mph, with gusts as high as 26 mph. The chance of precipitation is 100%. Little or no snow accumulation is expected.
Thursday Night
Showers are likely, mainly before 1 am. Mostly cloudy, with a low of around 32. The chance of precipitation is 70%.
Friday
Showers are likely, mainly after 1 pm. Mostly cloudy, with a high near 46. The chance of precipitation is 70%.
Friday Night
Showers are likely, mainly before 1 am. Cloudy, with a low around 38.
Saturday
A chance of showers after 1 pm. Mostly cloudy, with a high near 44.
Saturday Night
Mostly cloudy, with a low of around 34.
Sunday
Mostly cloudy, with a high near 46.
Sunday Night
A chance of showers. Mostly cloudy, with a low of around 35.
Monday
A chance of showers. Mostly cloudy, with a high near 47.

 


Forecast Discussion

- Mild with showers this morning, cooler with showers Wednesday

Radar shows a band of showers associated with an occluded front
tied to low pressure over Minnesota moving toward the cwa. This
band of showers will move northeast across the cwa this morning
leaving much of the afternoon dry. We`ll realize some mild air
this morning and temperatures will climb into the lower 60s across
the southern cwa prior to the front moving through. Closer to
noon, cooler air will begin flowing into the cwa from the
southwest.

Tonight will be dry and colder with lows around 40. The deep upper
low approaching from the west will result in a low forming over
southeast Lower Wednesday and we`re likely to see showers develop
over the southern cwa mid morning Wednesday and continue into the
afternoon as the upper low begins to move over Lower MI. Highs
Wednesday will remain in the 40s.

- Potential wintry mix of pcpn Wednesday night - Thursday


Wednesday night into Thursday continues to feature a low confidence
yet potentially moderate to high impact event in parts of GRR CWFA
or somewhere close by. Strong/rapid cyclogenesis is expected to take
place over the Great Lakes Region during this time as a deep upper
low/trough arrive and colder air sweeps in from the northwest. This
set up favors the (still low) potential of some heavier wet/slushy
synoptic snow accumulations, but the placement of the heavier QPF
under the upper low is still very difficult to pin down (as well as
if it even turns cold enough to changeover to all snow and snow hard
enough to overcome warm ground temps).

While this worst case/90th percentile scenario needs pointed out,
the best case/50 percentile forecast continues to be for a mixture
or rain and snow showers with fairly minor snow accumulations of 1
to 3 inches possible. Favored areas would be inland from the Lk MI
shoreline and/or across higher/colder elevations such as near/north
of M-20 and possibly the Irish Hills around JXN.

There`s also uncertainty regarding the extent/amounts of lake
effect/enhanced precipitation due to questions about H8 temps and wind
directions. Currently the guidance indicates the core of the coldest
air at H8 sliding south of MI but perhaps becoming cold enough for
lake effect rain and snow showers on Wednesday night into early
Thursday when the sfc low is potentially north of here and a
westerly flow dominates.

Another consideration in all of this is the interplay of the lake
aggregate component with the synoptic evolution of this system. The
Great Lakes are still quite warm (50-55F) and this will likely
influence the sfc low development/pressure pattern and resultant
wind directions to some extent. The global models are currently
locking in on the idea of the low initially developing in the
vicinity of Lakes Huron/Erie later Wednesday, pivoting northwestward
on Wednesday night toward the Straits area while deepening, then
sliding southward on Thursday while filling as another low forms
over New England. The New England low eventually becomes the primary
low by Thursday night. It will be interesting to see how the
Hires/mesoscale models eventually handle things in future runs.
newest oldest
Rocky (Rockford)
Rocky (Rockford)

Snow, snow , snow is coming! Rock n roll baby!

Mark (East Lansing)
Mark (East Lansing)

“The average temperature across the Lower 48 this fall is more than 7 degrees Fahrenheit above normal as of November 15. The warmest fall on record in 2016 was 4.04 degrees warmer than average. This fall will likely finish cooler than 7 degrees above normal with storms on the way this week, but it has still been the warmest start to fall on record.”

https://www.cnn.com/2024/11/19/weather/fall-temperature-change-climate/index.html

Mookie
Mookie

Wow – warmest fall ever after a warm summer!

Mark (East Lansing)
Mark (East Lansing)

Don’t remember about spring but wasn’t last winter the warmest on record too? I’m sensing a trend here.

Slim

I recorded 0.22” of rainfall yesterday and overnight. At the current time it is cloudy and 52 here in MBY.
Slim

Slim

The official H/L yesterday at GR was 55/40 there was 0.17” of rainfall. The sun was out 24% of the possible time. The highest wind gust was 26 MPH out of the SE. For today the average H/L is 46/32 the record high of 74 was set in 1930 the coldest high of 25 was set in 2022. The record low of 9 was set in 1986 the warmest low of 55 was set in 1991. The most rainfall of 1.33” fell in 1991 the most snowfall of 8.7” fell in 2022 the most on the ground of 10” was… Read more »