Area Forecast Discussion
Issued by NWS Detroit/Pontiac, MI

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589
FXUS63 KDTX 231700
AFDDTX

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
100 PM EDT Thu Mar 23 2017

.AVIATION...

Steady modest southeast flow will persist through the first half of
the forecast period. As a warm front approaches from the southwest,
expectations continue for a narrow region of showers to traverse
just after midnight - might even be a lightning flash or two. The
best coverage will be in the vicinity of FNT and MBS.

Winds aloft will increase substantially overnight with speeds
climbing into the 45-50 knot range below 2 kft. Therefore, will
continue with the low-level wind shear mention into Friday morning.
Winds will veer around to southwest in the wake of the warm front
Friday morning. The southern terminals will be under the influence
of a strengthening low-level pressure gradient. Speeds and gust
potential should emerge by mid-morning with the potential for peak
winds to touch 30 knots.

The warm front is expected to stall out across the far north and the
warm sector does not perform a clean sweep into Southeast Michigan.
Therefore, with ample low-level moisture lingering in the frontal
zone, opportunity for MVFR clouds appears respectable Friday.

For DTW...ceilings are expected to drop below 5 kft in the 04-08z
window with a few passing showers. Additional restricting ceilings
around 2 kft are expected after 15z. Wind gusts will also emerge in
this time window with values around 25 kts - occasionally reaching
30 kt.

//DTW THRESHOLD PROBABILITIES...

* Medium for cigs falling below 5000 ft 04-08z Thursday night.
* Medium for cigs falling below 5000 ft after 15z Friday.
* High for gusts exceeding 25 knots Friday.

&&

.PREV DISCUSSION...
Issued at 337 AM EDT Thu Mar 23 2017

DISCUSSION...
Large arctic high pressure is centered just east of the state this
morning keeping the coldest and driest air also just to the east.
This is resulting in lows this morning mostly upper teen and low 20s
as opposed to colder as advertised earlier. As this high continues
to slide eastward return flow will bring waa today. The day will
start with plenty sunshine before mid and high level clouds thicken
throughout the day ahead of approaching warm front. Highs today will
do about ten degrees higher then yesterday making it to the low to
mid 40s. Lows tonight will be reached early on in the mid 30s before
slowly rising as warm front lifts quickly through. Not much forcing
with this front other then moderate isentropic lift in the 850-600mb
level resulting in a band of showers that should last for a couple of
hours. Instability is near nil so do not expect any thunder. By
sunrise Friday the warm front should be positioned across the Saginaw
Valley and Thumb where it may lift a bit more north before stalling.
This will allow for very mild air to infiltrate the rest of the
forecast area with highs reaching the 60s most locations with upper
60s near the Ohio border. Dry air in the mid levels should cap off
moist low level resulting in mostly cloudy day and dry for the most
part with lack of any forcing. Exception will be continued shower
across the north closer to stalled front. If any significant breaks
can be made in the clouds 70 could easily be reached across the
south.

Closed low system centered over Oklahoma will gradually weaken as it
drifts towards lower Michigan over the weekend. This will continue
moist mild flow into the state. Another large arctic high will move
across eastern Canada forcing the stalled front across central lower
Michigan to slowly move back southward where it will stay throughout
the weekend providing focus for continued shower activity. The whole
muddled mess should exit the area for Monday. This will be quickly
follow by another wave exiting the Plains which will bring another
chance for showers Monday night and early Tuesday.

MARINE...

Large area of high pressure will build southeastward into the Mid
Atlantic today. As the surface high pushes southeastward, winds will
switch to the southeast and steadily increase. In response, a warm
front will become increasingly organized over the region. The warm
air streaming over the cold Lakes is expected to promote stable low
level profiles, limiting wind speeds over Lake Huron to 25 to 30
knots. Winds will diminish on Friday as warm front stalls over Lake
Huron, and then sinks south as a cold front Friday night into
Saturday, resulting in increasing easterly flow as high pressure
builds over Ontario, leading to long duration easterly flow over the
weekend.

&&

.DTX WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
Lake Huron...NONE.
Lake St Clair...NONE.
Michigan waters of Lake Erie...NONE.
&&

$$

AVIATION.....Mann
DISCUSSION...DRC
MARINE.......CB


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