Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 241945
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
345 PM EDT Fri Mar 24 2017

.SYNOPSIS...
Issued at 345 PM EDT Fri Mar 24 2017

A frontal boundary will drop south into the region bringing
increasing chances for rain to far northwest Indiana and lower
Michigan tonight, and across the entire forecast area on Saturday.
Temperatures will remain on the warm side for most locations,
with lows generally in the 50s tonight and highs in the 60s to
near 70 degrees on Saturday. The one exception will be across
lower Michigan, far northeast Indiana, and far northwest Ohio on
Saturday where temperatures may hold steady in the 50s. The
occasionally wet weather will continue into Sunday with highs
ranging between the upper 50s and upper 60s.

&&

.SHORT TERM...(This Evening through Saturday)
Issued at 345 PM EDT Fri Mar 24 2017

Unseasonably mild with increasing rain chances tonight-Saturday...

Warm sector well established over the area this afternoon with ample
sunshine supporting deeper mixing. The result has been for stronger
wind gusts 30-40 mph and highs well into the 70s in deep layered
southwest flow.

Shortwave energy translating east through Ontario with high pressure
building in its wake will force the near sfc portion of a southern
WI-central MI front south to near the Lake MI shoreline in far nw
IN/sw Lower MI this evening/overnight...and the rest of our lower
MI/far ne IN/far nw OH counties later tonight into Saturday. A
cooler marine influence to the north of this boundary will provide
a rather significant temp gradient making for a difficult/low
confidence temp forecast north of US 30 tomorrow.

Rain/embedded thunder chances will also increase in the vicinity
of this feature as the upper flow becomes increasingly diffluent
and deeper moisture advects in on a developing LLJ. This will
occur downstream of a Southern Plains low expected to wobble/fill
northeast into Missouri tomorrow. Continued to highlight lower
chances for scattered showers/iso thunder into far nw IN/lower MI
this evening into the early overnight near the boundary, as
moisture quality at least initially looks a little suspect with
more widespread activity setting up north near the mid level
front. Better chances then into Saturday mainly along/northwest of
Hwy 24 as low level convergence/isentropic lift increases on the
nose of a LLJ.

&&

.LONG TERM...(Saturday Night through Friday)
Issued at 345 PM EDT Fri Mar 24 2017

Mild and at times wet pattern continues late weekend/next week...

The above mentioned upper low will continue to fill/open
northeast through the local area on Sunday. Residual
forcing/moisture along with some potential for weak sfc
destablization remains supportive of likely-categorical PoPs for
showers and perhaps some embedded thunder into Sunday. Upstream
kicker will force this wave northeast of the area by Sunday night,
though cannot rule out some lingering drizzle/light showers near
a leftover low level trough. The next in a series of pacific
waves then brings the next chance for rain showers later Monday
into Monday night. This will be followed by slightly cooler/dry wx
for the middle of the week and then more rain chances Thursday-
Friday as the next impulse takes a track similar to this weekends
system.

&&

.AVIATION...(For the 18Z TAFS through 18Z Saturday Afternoon)
Issued at 1156 AM EDT Fri Mar 24 2017

VFR conditions expected through 00Z as low and mid clouds likely
begin to increase by late afternoon/early evening. Shower chances
will increase around/after 6z at KSBN with MVFR cigs/vsbys taking
hold. Potential for IFR at KSBN after 12Z as deeper moisture settles
in and more widespread area of showers possibly moves in. Have
stayed conservative, but cigs could drop to 500 ft or less and vsbys
less than a mile.

At KFWA, precip will likely take longer to reach the site with
measurable precip and MVFR cigs not arriving till closer to 15z with
deteriorating conditions after 18Z.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
MI...NONE.
OH...NONE.
LM...Small Craft Advisory until 8 PM EDT this evening for LMZ043-046.

&&

$$

SYNOPSIS...Steinwedel
SHORT TERM...Steinwedel
LONG TERM...Steinwedel
AVIATION...Fisher


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