Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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FXUS63 KGRR 211035

Area Forecast Discussion
National Weather Service Grand Rapids MI
635 AM EDT Wed Mar 21 2018


Issued at 314 AM EDT Wed Mar 21 2018

Expect partly cloudy skies with highs in the 40s and lows in the
20s through Sunday. A large blocking Canadian Polar high pressure
system, centered near southern Hudson Bay will remain in place
through this coming weekend. That will force all storm systems
this week, into this weekend, to track south of Michigan.


.SHORT TERM...(Today through Friday)
Issued at 314 AM EDT Wed Mar 21 2018

No significant weather issues through Friday. Being on the south
edge of a large Canadian Polar high pressure system we will stay
in the cooler air through Friday. We will see mid clouds from the
storm tracking south of the area today into tonight but the sun
should be able to shine through most of those clouds. Once that
storm gets east of the area Thursday skies should become mostly
clear until Saturday.

We remain on the down stream side of a large upper level ridge
through Friday. This will continue to force all Pacific storm
systems to track south of Michigan. Meanwhile our Polar Vortex,
while displaced southward to near Baffin Island, is keeping the
polar air locked north of the Polar Jet, which is currently near
65 north latitude. The southern branch of the polar jet is
largely over the Gulf States. The combination of these to features
will keeps all the polar air in the arctic and the really warm
air over the southern states.

The bottom line is highs in the 40s and lows in the 20s through

.LONG TERM...(Friday night through Tuesday)
Issued at 314 AM EDT Wed Mar 21 2018

Fair wx will continue through the weekend as a high pressure ridge
remains in control of our wx pattern. We will go with a dry fcst for
Saturday through Saturday night in lieu of recent medium range
guidance trends the past 24 hours which now suggest all pcpn with
the TN Valley low pressure system will stay south of our area
Saturday through Saturday night.

Fair wx will continue into Monday and temperatures will undergo a
slow moderating trend this weekend into early next week as southerly
flow develops on the back side of the departing ridge by next
Monday. High temperatures early next week will potentially reach the
50`s. The southerly flow will also result in increasing moisture and
a chance of showers by Monday night through Tuesday.


.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 635 AM EDT Wed Mar 21 2018

Solid VFR for the next 48 hrs and then some. The combination of a
storm tracking off to the south of Michigan and large Canadian
Polar high pressure system over James Bay will keep winds from the
north around 10kts today and become northwest tomorrow around 10
knots as the storm pulls away from the area.

The deck of thick high and some mid clouds near Jackson will be
gone by this evening leaving general clear skies for tonight and


Issued at 314 AM EDT Wed Mar 21 2018

We will see our northeast winds slowly turn to the northwest over
the next 24 hours as the storm to our south moves toward the east
coast. Winds and waves will remain below Small Craft Criteria.


Issued at 330 PM EDT Tue Mar 20 2018

Persistent dry pattern will allow rivers to continue to slowly
recede. The Portage River at Vicksburg will continue to remain
elevated for a few days yet, however. River levels should remain
near to below normal for the foreseeable future given the




LONG TERM...Laurens
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