Area Forecast Discussion
Issued by NWS Detroit/Pontiac, MI

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FXUS63 KDTX 150721

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
321 AM EDT Thu Mar 15 2018


A surface trough will continue to slide south through Michigan this
morning along with a trailing cold front. This will result in an
uptick in winds out of the northwest with gusts to around 25 mph
during the day. Also dropping south will be slight increase in low
level moisture that will bring more cloudy conditions. Weak cold air
advection will come with the passing of this front and expect high
temperatures to remain below average in the 30s. Locations to the
north across the Tri-Cities and the Thumb will be in the low 30s
while locations to the south of I-69 will be in the mid to upper
30s. The increased low level moisture brings the possibility to see
light snow showers/flurries across parts of southeast Michigan
today. However, the presence of a surface dry layer and lack of
deeper moisture will make it a struggle to see anything more intense
than flurries reach the surface. Best shot at seeing any appreciable
light snow will be towards the Thumb and Lake Huron shoreline where
the northwest winds will have a little extra moisture boost and
there will be slightly colder low levels.

Troughing over the northeastern CONUS continues to keep cold
northwest flow over southeast Michigan into tonight. Light snow
showers remain possible along the Huron coastline into the early
part of tonight. Given the more WNW flow, expect any heavier snow
showers to remain off the coast. Though, a few glancing showers
could produce some minor accumulations. Much drier air will begin to
 shut off any activity after midnight as a surface high pressure
dropping out of Canada begins to take hold. Clearing skies will
allow overnight temperatures tonight to drop slightly lower into the
teens for most locations.

Surface high pressure and weakening ridge will keep dry conditions
going through Friday. Winds will be on the downward trend through
the overnight time frame tomorrow and be on the lighter side by
Friday afternoon. Remaining cold air will keep high temperatures in
the 30s for one more day. The broad trough over the northeast begins
to loosen its grip a little by the weekend as a weakening low
pressure coming out of the Central Plains slides through IL/IN/OH.
This will provide a subtle push of warm air advection bringing
temperatures up into the 40s for most locations. The exception being
the Thumb where temperatures stay in the upper 30s. Precipitation
chances that will accompany the weakening low pressure look to
remain south of the Michigan border at this time. If low pressure
takes a more northerly track, some of the southern counties may see
an increase in precipitation chances for Saturday. On Sunday, the
Thumb finally gets into the 40s with the rest of southeast Michigan
under mostly sunny skies while a ridge builds across the central

The next low pressure system is forecast to push through the central
plains and into the Ohio Valley early next week. This will bring
increased precipitation chances to the southern portions of the
area. Still some differences in models in regards to the exact track
of this system, so confidence remains low at this time on how
rain/snow chances will play out. The low will also result in low
level northeast flow, which will draw some cooler temperatures
southward and lower high temperatures slightly for early next week.
General daytime highs will be in the lower 40s and upper 30s.


.MARINE...A push of colder air under northwest winds will advance
across lake Huron this afternoon and evening. Although over-lake
mixing depths will not be too terribly high, there remains high
probabilities of wind gusts around 30 knots across the open waters
of Lake Huron. A ridge of high pressure will extend across Lower Mi
on Friday. This will result in a steady weakening of the winds as
they back toward the west. A broad region of high pressure will
linger over the region through the weekend, leading to generally
light winds.


Issued at 101 AM EDT Thu Mar 15 2018


Broken to occasional scattered cloud deck in the 6-8kft range will
persist into Thursday morning as shortwave brushes by the area to
the north. A trailing cold front will then drop through the region
and bring ceilings more in the 3500-4500 foot range by mid morning.
Clearing will then occur very gradually from north to south by the
end of the forecast period. Southwest winds of 10 knots or so will
veer to northwest with the cold fropa with gusts to 20-22 knots in
best daytime mixing.

For DTW...Ceilings will remain above 5kft (~7kft) overnight and drop
to 3500-4500 feet Thursday morning. At least broken cigs should be
the rule much of the day with a better chance of breaks by evening.
Northwest flow (290-300) will develop Thursday morning with gusts to
20 knots or better during the day.


* Low for cigs aob 5kft overnight, high by 13z-14z Thursday, medium
  after 00z Thursday evening.


Lake Huron...Small Craft Advisory from 8 PM this evening to 4 PM EDT Friday for

     Small Craft Advisory from 8 AM this morning to 4 PM EDT Friday for

Lake St Clair...NONE.
Michigan waters of Lake Erie...NONE.



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