National Weather Service Raw Text Product

Displaying AFOS PIL: AFDIWX Received: 2017-10-17 17:03 UTC

FXUS63 KIWX 171703

Area Forecast Discussion
National Weather Service Northern Indiana
103 PM EDT Tue Oct 17 2017

Issued at 332 AM EDT Tue Oct 17 2017

A breezy and sunny day is in store for the region, with high 
temperatures in the 60's. Expect continued dry conditions and a 
gradual warming trend through the rest of the work week. Highs will 
range from the upper 60's to low-mid 70's through the weekend.  The 
next chance for rain will be late Saturday night into Sunday as a 
frontal boundary works its way through the forecast area. 


.SHORT TERM...(Today and Tonight)
Issued at 332 AM EDT Tue Oct 17 2017

Our quiet stretch of weather continues through the short term, as
surface high pressure expanding from the central and southern 
plains rests overhead. This high will expand and strengthen 
through the week. On the northwest side of the high lies a weak 
shortwave/trough (per obs/satellite) that will serve to gradually 
tighten the pressure gradient over our CWA as it moves closer. 
This shortwave will quickly be washed out as it intersects the 
building ridge aloft, so we won't see any precip or really cloud 
cover from this- but we'll see an increase in the winds today, 
with gusts up to 20-25 knots possible. A small craft advisory is 
in effect for our nearshore zones, as the gusty southwest winds 
will lead to choppy conditions. Highs today will be in the 60's. 
Lows tonight will drop into the 40's. Despite clear skies and our 
cooler airmass, stronger winds should keep temps a little warmer 
tonight than they were last night.


.LONG TERM...(Wednesday through Monday)
Issued at 332 AM EDT Tue Oct 17 2017

Thanks to our expanding ridge aloft, high pressure will remain in 
place through the weekend, with temperatures warming to above normal 
for this time of year. Highs will range from the upper 60's to low-
mid 70's through the weekend.

Our next chances for precipitation will be Saturday night into 
Tuesday. Last night, models agreed on the general plan for 
precipitation yesterday but disagreed on the timing. The ECMWF was 
slower in bringing the front through than the GFS/GEM. Today we see 
the same story-but with slightly different overall timing than 
yesterday. Sunday night was the timing from yesterdays run, now we 
change to Saturday night-with the main front moving through sometime 
Sunday (or Sunday evening if you go with the ECMWF). Significantly 
lowered pops from the consensus blend forecast-capping it around 40-
45% due to lower confidence, and kept front timing in between the 
two models. 

Significant discrepancies arrive on Monday into Tuesday with respect 
to the larger-scale patterns, and the associated precipitation 
chances. ECMWF has a long wave trough diving over the Great Lakes, 
deepening through Wednesday. The GFS has a closed low developing in 
the generally same vicinity. Given the disagreement, opted to 
stay more in line with the consensus but to lower pops
significantly (from likely to slight chance/chance). While there 
is a good chance for precipitation given the upper level patterns,
there is little confidence in the placement of that 


.AVIATION...(For the 18Z TAFS through 18Z Wednesday Afternoon)
Issued at 1258 PM EDT Tue Oct 17 2017

High pressure over the area for the forecast period will result in
clear skies and VFR conditions. Southwesterly flow is expected
this afternoon at 10 to 15 kts with gusts over 20 kts. Winds will
diminish by this evening. 


LM...Small Craft Advisory until 5 PM EDT this afternoon for LMZ043-




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