Area Forecast Discussion
Issued by NWS Northern Indiana

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FXUS63 KIWX 221924

Area Forecast Discussion
National Weather Service Northern Indiana
324 PM EDT Thu Mar 22 2018

Issued at 634 AM EDT Thu Mar 22 2018

Cool and dry northerly flow is expected through Friday. Lows
tonight will be in the lower to middle 20s and highs on Friday
will generally be in the middle to upper 40s. A storm system will
likely bring several inches of wet snow across northern
Illinois into central Indiana to southwest Ohio late Friday night
into Saturday. The greatest accumulations will likely be along and
south of a Logansport to Muncie Indiana line. Drier air then
returns Sunday into Monday, with temperatures warming into the 50s
by midweek. Rain chances increase along with the late Monday night
into Tuesday.


.SHORT TERM...(This Evening through Friday)
Issued at 311 PM EDT Thu Mar 22 2018

Minimal change with respect to near/short term with minor thermal
moderation into Friday amid building heights amid short duration
height building across western portion of Upper Great Lakes in
advance of progressive shortwave ejection within base of northeast
Pacific vortex base ejection.


.LONG TERM...(Friday Night through Thursday)
Issued at 311 PM EDT Thu Mar 22 2018

Again two systems noteworthy. Slight southward shunt of late Fri
night/Saturday system with respect to sharp moisture/i300k upglide
demarcation. Will continue present winter storm watch with
eventual/presumptuous shift to eventual winter wx advisory for far
southwest/southern Indiana portion CWA. Confidence levels preclude
any variance from areal extent of watch at this time. Mix farther
north. Lesser isentropic moisture availability/lower level easterly
flow on fringe and eventual mix/road temp melting should greatly
lower potential impact through northern fringe.

Late weekend deep southwesterly flow through baja into midwest to
promote significant moisture return, followed by rich GOMEX feed
addition Mon/Tue for high pop/high confidence in rain event late
Monday night into Tuesday. However, present HWO mention of locally
heavy rainfall remains sufficient at this point.


.AVIATION...(For the 18Z TAFS through 18Z Friday Afternoon)
Issued at 124 PM EDT Thu Mar 22 2018

Persistent ridging and abundant dry air throughout the column
will ensure VFR conditions through the period with light N/NW


IN...Winter Storm Watch from late Friday night through Saturday
     afternoon for INZ013-020-022-023-032>034.



LONG TERM...Murphy

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