Scientific Forecaster Discussion

Return to Local Conditions & Forecast

Without Abbreviations
With Abbreviations

fxus63 kgrr 082324 

Area forecast discussion
National Weather Service Grand Rapids Michigan
624 PM EST sun Dec 8 2019

Latest update...

issued at 225 PM EST sun Dec 8 2019

- light rain tonight and Monday

- rain changes to snow Monday Night

- Lake effect snow showers Tuesday


Discussion...(this evening through next sunday)
issued at 225 PM EST sun Dec 8 2019

No big storms this week but there could be some travel impacts
Tuesday morning as cold air rushes in Monday night causing
residual moisture to freeze and adding a coasting of snow on top
of it. The rain transitions to snow and temperatures drop below
freezing by the morning commute, so an advisory may be needed.

Lake effect snow showers continue through Wednesday evening but
are limited by inversion height at or below 5 kft during that
time, so amounts are expected to be light, generally a couple
inches or less across the western third of the forecast area.
Skies should at least partially clear on Wednesday night allowing
temperatures to drop to the 5 to 15 degree range for Thursday

A weak clipper could bring some light snow across the northern
zones later Thursday, then we will have to watch a southern
stream low moving north at the end of the week that could
eventually spread some rain or snow Friday and Saturday.


Aviation...(for the 00z tafs through 00z Monday evening)
issued at 610 PM EST sun Dec 8 2019

Impacts will be on the increase as some Gulf moisture lifts up
from the MS valley into Michigan. IFR and lower conditions will be
developing and persisting through 00z Tue. There will be rain
moving in as well. The wind will be on the decrease through the
evening and into tonight. The wind will start to shift later
Monday as the low pressure system tracks into northern lower Michigan.


issued at 225 PM EST sun Dec 8 2019

Gale Warning was replaced with a Small Craft Advisory for the marine zones north of
Holland. Winds and waves will continue to diminish this afternoon
and evening.


GRR watches/warnings/advisories...
Lm...Small Craft Advisory until 7 PM EST this evening for lmz844>849.



National Weather Service Glossary of Abbreviations