Area Forecast Discussion
Issued by NWS Twin Cities, MN

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FXUS63 KMPX 171233

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
633 AM CST Tue Jan 17 2017

.UPDATE...For 12z Aviation discussion below


.SHORT TERM...(Today and tonight)
Issued at 410 AM CST Tue Jan 17 2017

It will be an icy start to the morning for much of east central
Minnesota and west central Minnesota, especially on untreated
roads/pavement. Due to the current road conditions, combined with
the lingering snow/sleet/freezing rain mix that`s ongoing from the
Twin Cities metro north along the Interstate 35 corridor and east
into west central Wisconsin, have extended the advisory through
the morning commute.

By the noon hour, the responsible shortwave will have shifted
southeast of the forecast area, so precip should follow suit and
come to an end in west central Wisconsin. Clouds will linger a bit
longer, especially over eastern areas. Temperatures will remain
mild, with highs in the mid 20s to mid 30s and lows from 15 to 20.

.LONG TERM...(Wednesday through Monday)
Issued at 410 AM CST Tue Jan 17 2017

The main story in the extended has not changed much, it`s the
prolonged January thaw expected the rest of this week through
the weekend. Although the forecast has a lot of precip chance
mention from Friday on, we are not anticipating any significant
precip makers to impact the region through Monday.

Through the extended, the GFS/ECMWF do not differ much on the large
scale pattern details, which still looks to feature a blocking high
building out of the Atlantic across eastern Canada while a series of
storm systems crashing ashore the Pacific coast will slowly build a
deep trough across western North America. This pattern will result
in a pronounced split in the flow, with the northern stream
displaced well to the north across central/northern Canada while the
southern stream goes across the southern CONUS.  Where differences
in details start to show up is with how some of the southern stream
will get ejected up this direction this weekend into next week.

We continue to have high confidence in a prolonged stretch of warm
weather with highs in the mid 30s/lower 40s from Wednesday through
Monday. That`s the good news, the bad news is this is a January
thaw, not a March thaw, which means come Wednesday night, this
stretch of warm weather looks to feature ample stratus and fog, not
bright sunshiny days. RH-time heights from the GFS highlight this
well, with low level saturation moving in Wednesday evening, with
the low levels remaining saturated for the next several days. So it
will be warm, but with a side of permacloud. What this warmth and
cloud cover will mean is very little in diurnal temperature ranges,
with ranges of just 5 degrees looking to be tough to come by once
the clouds set in.

For precip, this forecast is unfortunately full of it from Friday
on, though it does not look to be as bad as all of the 20-40 pops
may imply.  Basically, by Friday, we get into a very moist
southeasterly low level flow with several disturbances heading our
way beginning Friday afternoon for our eastern areas. After that, we
look to get into a showery/drizzly period of weather that will last
through the weekend. It`s not until the middle of next week that a
more organized system looks to possibly work across the upper MS


.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 633 AM CST Tue Jan 17 2017

Areas of freezing drizzle and light snow will occur from east
central MN across west central Wisconsin this morning.
Precipitation should end at KMSP around 15z, KRNH by 18z, and KEAU
around 21z. While some pockets of VFR are found in the bank of
clouds, overall MVFR with occasional IFR will prevail through the
morning, with improvement this afternoon with VFR conditions
returning and prevailing through the remainder of the period.

Light freezing drizzle and snow through 15z, then MVFR/IFR until
18z. VFR expected to return for the afternoon through the
remainder of the period. Winds northwest AOB 10kts backing to the
west/southwest this afternoon.

Wed...VFR. Chc MFVR late. Winds SW 5-10 kts.
Thu...MVFR. Chc IFR. Winds S 5-10 kts.
Fri...MVFR/IFR. Slight chance -RA. Winds southeast around 5 mph.


WI...Winter Weather Advisory until 9 AM CST this morning for WIZ023-

     Winter Weather Advisory until noon CST today for WIZ025>028.

MN...Winter Weather Advisory until 9 AM CST this morning for MNZ060-



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