National Weather Service Forecast for: Omro, WI
Issued by: National Weather Service Green Bay, WI
Updated: Sun, 20-Jan-2019 6:39am CST

Omro
 
Today

Today: Sunny
Sunny
M.L. King
Jr. Day
M.L. King Jr. Day: Mostly Sunny
Mostly Sunny
Tuesday

Tuesday: Snow
Snow
Wednesday

Wednesday: Mostly Sunny
Mostly Sunny
Thursday

Thursday: Mostly Cloudy then Slight Chance Light Snow
Mostly Cloudy then Slight Chance Light Snow
Friday

Friday: Partly Sunny
Partly Sunny
Saturday

Saturday: Slight Chance Snow Showers then Partly Sunny
Slight Chance Snow Showers then Partly Sunny
 
Hi 9 °F ↓ Hi 19 °F ↓ Hi 25 °F Hi 23 °F Hi 21 °F Hi 2 °F Hi 9 °F  
 
Tonight

Tonight: Mostly Clear
Mostly Clear
Monday
Night
Monday Night: Mostly Cloudy then Slight Chance Light Snow
Mostly Cloudy then Slight Chance Light Snow
Tuesday
Night
Tuesday Night: Snow
Snow
Wednesday
Night
Wednesday Night: Partly Cloudy
Partly Cloudy
Thursday
Night
Thursday Night: Mostly Cloudy
Mostly Cloudy
Friday
Night
Friday Night: Mostly Cloudy then Slight Chance Snow Showers
Mostly Cloudy then Slight Chance Snow Showers
Saturday
Night
Saturday Night: Mostly Cloudy
Mostly Cloudy
 
Lo -3 °F Lo 14 °F Lo 17 °F Lo 7 °F Lo -6 °F Lo -10 °F Lo -3 °F  

 

Today
 
Sunny. High near 9, with temperatures falling to around 5 in the afternoon. Wind chill values as low as -14. North wind 7 to 13 mph, with gusts as high as 18 mph.
Tonight
 
Mostly clear, with a low around -3. North wind 1 to 6 mph.
M.L. King Jr. Day
 
Mostly sunny. High near 19, with temperatures falling to around 14 in the afternoon. East southeast wind 1 to 10 mph.
Monday Night
 
A slight chance of snow after midnight. Mostly cloudy, with a low around 14. South southeast wind around 12 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tuesday
 
Snow. Cloudy, with a high near 25. Southeast wind 3 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
Tuesday Night
 
Snow. Cloudy, with a low around 17. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
Wednesday
 
Mostly sunny, with a high near 23.
Wednesday Night
 
Partly cloudy, with a low around 7.
Thursday
 
A slight chance of snow after noon. Mostly cloudy, with a high near 21.
Thursday Night
 
Mostly cloudy, with a low around -6.
Friday
 
Partly sunny, with a high near 2.
Friday Night
 
A slight chance of snow showers after midnight. Mostly cloudy, with a low around -10.
Saturday
 
A slight chance of snow showers before noon. Partly sunny, with a high near 9.
Saturday Night
 
Mostly cloudy, with a low around -3.

 

Forecast from NOAA-NWS for Omro, WI.

000
FXUS63 KGRB 201012
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
412 AM CST Sun Jan 20 2019

Forecast discussion for routine morning forecast issuance

.SYNOPSIS...
Issued at 409 AM CST Sun Jan 20 2019

Rather cold today and tonight, then moderating temperatures with
a round of "shovelable" snow during the first half of the upcoming
work week.

The very energetic split flow across North America will gradually
consolidate as a full-latitude ridge slowly evolves near the West
Coast. As the ridge builds, a large, deep trough will strengthen
from Hudson Bay into the Great Lakes region. A persistent flow of
cold air from high latitudes into the northern CONUS will result,
causing temperatures across the forecast area to end their
rollercoaster ride and settle at substantially below normal
levels. Medium range models are still trying to hone in on the
details of the pattern, but the coldest conditions may occur
beyond the end of the forecast period. There will be numerous
opportunities for precipitation as a strong baroclinic zone
remains across the area. The most significant will probably be as
a southern stream cyclone crosses the region during the early to
middle part of the upcoming work week. Despite the cold,
precipitation amounts will probably end up AOA normal for the
period.
&&

.SHORT TERM...Today...Tonight...and Monday
Issued at 409 AM CST Sun Jan 20 2019

Dealing with the ongoing wind chill headline is messy. Temperatures
were cold, but winds have gone calm across much of the advisory
area. Decided to continue the advisory since wind chills will
probably dip to -20 to -25 for a time after sun-up when winds pick
up a bit.

A similar conundrum may occur with wind chills again tonight. Will
leave it for the day shift to make a final decision on headlines
after we can hopefully hone in on exact temperatures and winds
speeds a little better.

The other main short-term forecast problem is the lake-effect
potential--especially off Lake Michigan. A strong land breeze
circulation has carried the primary lake band away from the
Wisconsin shoreline, though some clouds and flurries could still
brush lakeshore areas at times. Northern Door County will be most
susceptible to that as bands off Lake Superior will precondition
the air flowing across northern Lake Michigan. The high-res models
also suggest the possibility of meso-lows forming within the
primary lake band later today into tonight as the large scale
flow continues to weaken. Once that occurs, movement of the band
can become erratic, and felt it was prudent to keep at least a
mention of snow showers lakeside. The large scale flow veering
south will probably drive the lake band back to the Wisconsin
shore on Monday. The Door Peninsula is again the most likely area
to be affected. Some of the models show the band dissipating by
that point, but given the favorable conditions for maintenance of
the band today into tonight, is seems doubtful it will go away
that quickly.

Went a little below a blend of top performing guidance products
for highs today and Monday, as guidance has been a little too warm
lately. Lowered mins for tonight in most areas given the cold air
mass across the area and the expectation of light winds. Clouds
could mess things up of course, but it seems likely we`ll have at
least a cloud-free period everywhere except possibly near Lake
Michigan.

.LONG TERM...Monday Night Through Saturday
Issued at 409 AM CST Sun Jan 20 2019

Models remain consistent with the amplified mean flow to consist
of an eastern Pacific/West Coast upper ridge, a deep/broad upper
trough over east-central NOAM and a western Atlantic upper ridge.
This pattern will bring a northwest flow into WI with a couple of
arctic intrusions (early week and late week). There is one main
system of interest Monday night through Tuesday night that appears
to bring accumulating snow and possible headlines to northeast WI.
Other than Tuesday, temperatures are expected to be below to
well-below normal.

Attention is focused on a developing system over the central
Plains with an inverted surface trough extended north-northeast
into the Upper MS Valley Monday night. A tightening pressure
gradient between the low pressure over KS and high pressure over
the eastern CONUS will crank up a southerly low-level jet (up to
60 knots) which will quickly transport gulf moisture northward.
The increasing moisture transport, combined with WAA, should bring
an increasing chance for light snow across most of the forecast
area. Snow potential by daybreak could range from a dusting south,
to as much as 3 inches north of Hwy 8. Min temperatures Monday
night to be around 10 above zero north, middle to upper teens
east-central WI.

The surface low is forecast to track northeast and reach southeast
IA by 00Z Wednesday, as the inverted surface trough to move east
across western/central WI. Accompanying these surface features
will be a trailing shortwave trough that adds mid-level Q-G
forcing. Based on the location of best lift and forcing, the axis
of higher snow amounts would shift toward central/east-central WI
on Tuesday, especially during the afternoon hours where 2-3 inches
of snow is possible. Max temperatures to range from around 20
degrees north-central WI, to the middle to upper 20s eastern WI.

The overall trend of the models have slowed this system down a
bit, similar to what the ECMWF showed last night. The surface low
moves northeast through northeast IL Tuesday evening and
eventually reaches Lake Huron late Tuesday night. This track
favors parts of central and most of east-central WI in the
deformation zone as the models indicate moderate mid-level
frontogenesis. Potential for another 1 to 3 inches of accumulation
with lesser amounts farther north and west during the evening.
If these trends do not change, a winter weather headline would
become necessary over parts of the forecast area. The snows should
then begin to taper off overnight with min temperatures 5 to 10
above zero north-central, 15 to 20 degree range east-central WI.

There could be a brief window late Tuesday night into Wednesday
morning for lake effect snow showers over Vilas County as
northwest winds and modest cold air moves over western Lake
Superior. However, a surface ridge axis is forecast to move into
the western Great Lakes on Wednesday bringing drier air and
backing winds to the area, thereby ending the lake effect threat.
The remainder of northeast WI should see a mix of sun and clouds
with max temperatures mainly in the upper teens to lower 20s.

A clipper system is progged to move southeast from Lake Winnipeg
to Lake Superior Wednesday night, then turn east-southeast toward
northeast Lower MI/southeast Ontario on Thursday. A strong cold
front will accompany the clipper, as well as a trailing mid-level
shortwave trough. While stronger forcing to remain along/north of
the surface low track, expect to see at least a small chance of
light snow with the passage of the cold front on Thursday. Max
temperatures to be in the middle to upper teens north-central,
lower 20s elsewhere.

Arctic air to overspread the region Thursday night with 8H
temperatures tanking into the -26 to -30C range. Northwest winds
and these bitterly cold temperatures should lead to lake effect
snow showers across north-central WI Thursday night into Friday
morning before the approach of high pressure backs the winds
making trajectories unfavorable. The main story here will be the
temperatures with mins Thursday night from 10 to 15 below zero
over central WI, to around zero near Lake MI. Max temperatures for
Friday are expected to struggle to reach zero over central WI,
zero to 5 above for eastern WI. Add in a northwest wind of 10 to
15 mph and wind chills Friday morning could dip into the -20 to
-30 degree range.

Another snow chance arrives late Friday night into Saturday as
another mid-level shortwave trough drops southeast within the
broad upper trough over the eastern half of the CONUS. There could
be a surface reflection as well to help generate light snow over
the forecast area. A wind shift to the west-southwest should allow
temperatures to `warm` a bit with readings on Saturday from 5 to
10 above zero central WI, 10 to 15 above eastern WI.
&&

.AVIATION...for 12Z TAF Issuance
Issued at 409 AM CST Sun Jan 20 2019

MVFR conditions with lake-effect clouds should be confined
primarily to the far north and near Lake Michigan. Anticipate
primarily VFR conditions at all the TAF sites except MTW.
&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Wind Chill Advisory until 10 AM CST this morning for WIZ005-
010>012-018-019.
&&

$$

SYNOPSIS.......Skowronski
SHORT TERM.....Skowronski
LONG TERM......Kallas
AVIATION.......Skowronski

NWS GRB Office Area Forecast Discussion