Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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FXUS63 KGRR 171922

Area Forecast Discussion
National Weather Service Grand Rapids MI
322 PM EDT Sat Mar 17 2018

Synopsis/Short Term/Long Term/Hydro

Issued at 322 PM EDT Sat Mar 17 2018

Clear skies across Michigan will continue into next week thanks to
high pressure in southern Canada. After highs in the 50s Sunday,
we`ll see cooling trend begin Monday as temperatures fall back to
the 30s Tuesday and Wednesday.


.SHORT TERM...(This evening through Monday night)
Issued at 322 PM EDT Sat Mar 17 2018

No concerns in the short term. High pressure over Manitoba will
slowly move southeast to Ontario during the next few days. The cool
dry feed of air from Ontario will continue as low pressure over the
Plains moves east across the Tennessee Valley. That system will be
too far south to produce precipitation across Southwest Lower

Another chilly night is expected. We lowered mins a bit from mos
guidance and expect lows in the lower to mid 20s tonight. The
warmest day of the week will be tomorrow as the temperature climbs
into the 50s.

.LONG TERM...(Tuesday through Saturday)
Issued at 322 PM EDT Sat Mar 17 2018

The only thing of much interest in the long term period is the
possibility of accumulating snow and/or some freezing rain next
Friday night and Saturday.

A system tracking just south of Michigan is progged to have over a
half inch of water equivalent, with a shallow cold air mass expected
to be in place courtesy of a 1040 mb surface high over Ontario.
Currently the best chance of precipitation is near and south of I-94
but this is a week out and confidence still quite low regarding the
timing and northern extent of the precip. Certainly something to
watch though.

Otherwise the long term period remains very quiet but continued
rather chilly as surface ridging and dry air continues to dominate.


.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 143 PM EDT Sat Mar 17 2018

Confidence is very high that VFR conditions will continue through
Sunday. Easterly sfc winds of 5-10 kts today will become westerly
for tonight and Sunday.


Issued at 322 PM EDT Sat Mar 17 2018

The Portage River near Vicksburg will remain just above flood stage
through Tuesday and then remain near flood stage through the end of
next week. Otherwise, dry weather is expected through next week.




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