Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 172344

Area Forecast Discussion
National Weather Service Northern Indiana
744 PM EDT Sat Mar 17 2018

Issued at 731 PM EDT Sat Mar 17 2018

Dry conditions can be expected through the remainder of the
weekend as a ridge of high pressure controls the weather across
the region. Low temperatures tonight will drop into the mid 20s.
High temperatures on Sunday will reach into the lower to mid 50s,
and in the 40s on Monday. There is a chance of light snow south of
Route 30 late Monday night into Tuesday.


Issued at 731 PM EDT Sat Mar 17 2018

A lagging upper level short wave is becoming increasingly affected
by stronger northwest upper flow across Great lakes region this
evening, and will continue to get sheared as it drops southeast
across the Ohio Valley. Southeast advancement of this wave will
allow low level front/moisture gradient to slip southward this
evening with clear skies for tonight. Drying low levels and
diminishing winds should result in decent radiational cooling
conditions and will stay with idea of previous forecast in
undercutting MOS guidance slightly with lows in mid 20s.


.SHORT TERM...(Tonight and Tomorrow)
Issued at 205 PM EDT Sat Mar 17 2018

Shra within swd settling shear axis will push out of srn zones early
this evening while clearing line continues to cut south. Another
cold night in store overnight given clearing and sfc ridge nosing
into wrn zones by daybreak.

Main theme though will be ridging sfc and aloft building across the
wrn OH valley on Sunday yielding the mildest day of the upcoming
week. Mid march insolation will yield 50-55 for highs.


.LONG TERM...(Monday through Friday)
Issued at 205 PM EDT Sat Mar 17 2018

Primary notable trend is with significant height suppression within
deep nrn stream upper troughing over ern Canada steering deep
cyclone spinning up over wrn KS late Sunday south of the OH river
Mon-Tue. Trends from yesterday certainly clear cut and have dropped
all mention of precip early-mid period sans extreme south.

Otherwise within suppressed height field aloft, cool thermal
troughing will persist and actually intensify some Wed-Thu with well
below normal temps through the period.


.AVIATION...(For the 00Z TAFS through 00Z Sunday Evening)
Issued at 731 PM EDT Sat Mar 17 2018

A secondary upper trough interacted with a lingering low level
baroclinic zone earlier today to provide a few light rain showers
or sprinkles. As this system departs this evening, drier air will
advect southward with mainly clear skies through this forecast
valid period. Sfc high pressure will bring generally light and
variable winds tonight, with weak westerly component for Sunday as
center of this high pressure remains just south of northern





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