Area Forecast Discussion
Issued by NWS Indianapolis, IN

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FXUS63 KIND 241852

Area Forecast Discussion
National Weather Service Indianapolis IN
252 PM EDT Fri Mar 24 2017

The LONG TERM Section has been updated below.


Issued at 258 AM EDT Fri Mar 24 2017

A series of upper lows and surface low pressure systems will keep
frequent chances for rain in the forecast into next week.
Temperatures will be near to above average through the period.


.NEAR TERM.../This Afternoon/
Issued at 111 PM EDT Fri Mar 24 2017

Had to raise temperatures about 4 degrees based on trends and also
increased the wind speed to 20 to 25 mph with gusts to 35 mph.

Previous discussion follows...
Issued at 258 AM EDT Fri Mar 24 2017

Upper ridging will help keep the area dry today, but an increase in
clouds is expected with moisture and some isentropic lift in a warm
advection pattern.

With the cloud cover increasing, didn`t go as warm as the model
blend for high temperatures. However, did go warmer than some of the
MOS numbers. The result is highs in the upper 60s to around 70.

Some of the stronger winds not too far off the surface may mix down
at times today, providing wind gusts around 30 mph.


.SHORT TERM.../Tonight through Sunday night/
Issued at 258 AM EDT Fri Mar 24 2017

Models are close enough that the model blend initialization
was accepted for most items.

Upper ridging will move out of the area tonight as an upper low
begins to move closer to the forecast area. While there will be a
decent flow of moisture into the area, it looks like better forcing
will hold off until Saturday. Will keep the evening dry, then allow
for some increase in PoPs overnight. Far western areas will see
likely PoPs very late tonight, with chance category or lower PoPs

During the day Saturday as the upper low gets closer upper overall
forcing will increase. Moisture will continue to move in on a good
southerly flow. Will go likely or higher PoPs most areas by late

The upper low will keep providing good forcing across much of the
area Saturday night and Sunday morning, requiring likely category or
higher PoPs. Chances will begin to diminish later Sunday afternoon
and Sunday night as the low moves off to the northeast.

Temperatures will remain mild with upper flow generally remaining
south to southwest. Stayed with the model blend`s temperatures.


.LONG TERM /Monday Night through Thursday Night/...

Issued at 237 PM EDT Fri Mar 24 2017

Back to back low pressure systems are still expected to affect
the forecast area during the extended period. The period will
start out though with most of the first system already through
the area. As a result, the thunderstorm threat will diminish by
Monday night with just rain showers lingering into Tuesday. After
that, a ridge will strengthen over the area for mid-week,
resulting in dry conditions from Tuesday night through Wednesday
night. At that point, the next system tracking through the
Missouri Valley will move closer to central Indiana. So, rain will
spread across the forecast area from west to east on Thursday,
increasing in coverage by Thursday night.  Meanwhile,
temperatures through the period will be above normal with highs
generally in the 60s and lows in the 40s and 50s.


.AVIATION /Discussion for the 241800Z TAF Issuance/...
Issued at 1249 PM EDT Fri Mar 24 2017

Good confidence that VFR conditions will prevail through at least
05z. After that, expect showers to gradually spread east across the
terminals. Should still be mostly VFR, but MVFR conditions can not
be ruled out. Also, would not rule out thunderstorms, but chances
too low to mention.

Winds will be southerly 15 to 20 knots through 02z or so and then
drop to 10 knots or less overnight before gusty winds return after
14z Saturday. Also, could see some low level wind shear at LAF from
07z-13z as a low level jet moves in from the west.





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