Area Forecast Discussion
Issued by NWS Green Bay, WI

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FXUS63 KGRB 231605

Area Forecast Discussion
National Weather Service Green Bay WI
1105 AM CDT Fri Mar 23 2018

Updated aviation portion for 18Z TAF issuance

.SHORT TERM...Today...Tonight...and Saturday
Issued at 332 AM CDT Fri Mar 23 2018

Persistent Hudson Bay high pressure will continue to bring dry
weather through the weekend. A swath of heavy snow will stay
well to our southwest tonight into Saturday, with only an increase
in clouds anticipated over the southwest half of the GRB forecast
area. East to northeast winds will also increase as low pressure
tracks to our south. Weak CAA and increased flow off Lake
Michigan should result in some minor cooling the next couple
days. Highs today and Saturday should be in the middle 30s to
middle 40s. Lows tonight should be in the teens north, and lower
to middle 20s south.

Continued the trend of lowering dew points into the single digits
in the sandy soil regions during the afternoons, with relative
humidity dropping to 20 to 35 percent (typical values seen with
a Hudson Bay high in the spring).

.LONG TERM...Saturday Night Through Thursday
Issued at 332 AM CDT Fri Mar 23 2018

A mid level ridge and large Canadian high pressure system should
keep the forecast area dry, but cooler than normal until these
features move farther to the east.

Temperatures will warm up as flow aloft becomes southwest, and an
approaching surface system will bring increasingly moist air to
the area. There is a chance for showers, except in far northeast
Wisconsin, Monday afternoon. Precipitation chances increase Monday
night and spread across the remainder of the area. Rain may mix
with, or change to, snow in the north as temperatures fall
overnight. Looks like enough instability to at least mention
thunder in eastern and parts of central Wisconsin late Monday
night and Tuesday. Any snow or mix will change to rain by mid
morning on Tuesday as the boundary layer warms. Rain should exit
the area Tuesday night, possibly changing to snow before coming to
an end. Another surface high/ridge should keep the area dry
Wednesday through Thursday. The exception is in far northern
Wisconsin where a mid level short wave will bring a small chance
for rain or snow late Wednesday night into Thursday.

Highs Monday through Wednesday should be mostly in the mid 40s to
lower 50s. Slightly cooler temperatures are in store for Thursday
in the wake of the departing system.

.AVIATION...for 18Z TAF Issuance
Issued at 1030 AM CDT Fri Mar 23 2018

VFR flight conditions are anticipated through the TAF
period. Cirrus will increase late this afternoon into tonight as
a storm system slides southwest of the region. Breezy northeast
winds will shift to the east late tonight into Saturday and become
gusty. Some possibility of wind shear over the central WI taf
sites tonight, but thought it was too marginal and left out of
the forecast.




SHORT TERM.....Kieckbusch
AVIATION.......MPC is the U.S. government's official web portal to all federal, state and local government web resources and services.