National Weather Service Raw Text Product
Displaying AFOS PIL: AFDGRR Received: 2019-02-18 11:39 UTC
982 FXUS63 KGRR 181139 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 639 AM EST Mon Feb 18 2019 LATEST UPDATE... Aviation .SYNOPSIS... Issued at 328 AM EST Mon Feb 18 2019 - Snow tapers off Monday morning. Additional dusting to 1" of snow possible. - Dry and cold through midweek - Light snow developing Tuesday night/Wednesday morning with wintry mix possible Wednesday afternoon. && .DISCUSSION...(Today through next Sunday) Issued at 328 AM EST Mon Feb 18 2019 Snow has already begun to diminish tonight and thus the Advisory is canceled. Expect lingering flurries and light snow to continue into the Monday morning commute allowing for some possible travel impacts. An additional dusting to 1" of snowfall will be possible with this lingering snow before conditions dry out mid-morning. Quiet conditions will then return for the rest of the day Monday as an expansive area of high pressure drifts across the Great Lakes through Tuesday. Rather cold temperatures in the negatives to single digits expected Monday night into Tuesday as light winds, clearing skies, and a fresh snowpack help aid in radiational cooling. Attention now shifts to the Tuesday night/Wednesday time frame as a mid-level and surface low pressure approaches from the south-central plains towards the Great Lakes/Ohio Valley region bringing with it light snow with some mixed precip. Warm and moist air advection combined with upper-level diffluence will support an area of precipitation over the region through much of Wednesday. As the precip shield approaches from the south late Tuesday/early Wednesday, snow will be the main p-type before the warm layer lifts north during the day. With the most abundant moisture to the southeast of our area, only a few inches of snowfall look likely for southwest lower MI through Wednesday morning. During the afternoon period a wintry mix with some possible freezing rain may impact travel conditions. High pressure then filters into the Great Lakes region Thursday and Friday bringing back dry conditions. Next period that has attention in the long term is Saturday. Still quiet a bit of disagreement on overall track and thus impacts, but bears watching moving forward. No matter the track, it still appears the temperatures will be marginal enough to have some type of mixed precip possibility. && .AVIATION...(For the 12Z TAFS through 12Z Tuesday morning) Issued at 639 AM EST Mon Feb 18 2019 Areas of IFR early this morning will give way to MVFR then VFR later this morning as the snow winds down. North winds around 10 knots today will go light and variable tonight. && .HYDROLOGY... Issued at 1226 PM EST Sun Feb 17 2019 Ice continue to impact the area around Portland. The weather pattern will remain colder than normal so we do not expect the ice to break up any time soon. Elsewhere...we are looking at some very cold overnight low temperatures the next couple of nights. So there will likely be some additional ice forming. We will continue to monitor the situation closely. A moderating trend is forecasted with the temperatures for the end of the week. At this time any melting would be rather gradual based on the current forecasts. && .GRR WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...Honor DISCUSSION...Honor AVIATION...Ostuno HYDROLOGY...MJS