Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 211033
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
633 AM EDT Sat Apr 21 2018

.SYNOPSIS...
Issued at 320 AM EDT Sat Apr 21 2018

Temperatures will continue to moderate through Monday as a weak
high pressure area remains over the region with highs in the upper
50s today and the lower 60s Sunday. Highs will finally rise above
normal Monday into the upper 60s to near 70. A more unsettled
pattern will follow with chances for rain starting Tuesday.

&&

.SHORT TERM...(Today through Monday)
Issued at 316 AM EDT Sat Apr 21 2018

A weak ridge of high pressure will remain over the region through
Monday. The high will be accompanied by fair skies and light
winds. Temperatures will finally rise above normal as the airmass
modifies with highs around 60 today, and then approaching 70
Monday. Lows tonight and Sunday night should stay above freezing.

&&

.LONG TERM...(Monday night through Friday)
Issued at 400 AM EDT Sat Apr 21 2018

A weak upper level ridge will have helped temperatures to finally
rise above normal early next week as an upper level low moves
east across the CONUS. This low will initially track south of the
Ohio River, helping to keep the forecast area in a mild and dry
pattern into Monday night. However, with the interaction/fujiwhara
effect of an upstream system, chances for rain will then be
increasing starting Tuesday as the upper low starts to track due
north across the Ohio River. After coordinating with offices to
the south, rejected the model blend bring rain into the forecast
area Monday and kept the forecast dry. The pattern will remain
unsettled into late next week as a strong upper level trof tops
the upstream ridge and amplifies across the Upper Great Lakes
region. Colder air will then spread back into the area for next
weekend.

&&

.AVIATION...(For the 12Z TAFS through 12Z Sunday Morning)
Issued at 631 AM EDT Sat Apr 21 2018

No changes of significance with respect to 12 UTC TAFs for
northern Indiana. Continued VFR through the period and beyond.
Little more than middle/high level clouds associated with plains
vortex spilling northeast into strong ridging. Dry/subsident
subcloud layer to prevail. Provided some detail for onshore/lake
breeze penetration into KSBN about midday/early afternoon.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
MI...NONE.
OH...NONE.
LM...NONE.
&&

$$

SYNOPSIS...Skipper
SHORT TERM...Skipper
LONG TERM...Skipper
AVIATION...Murphy


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