Area Forecast Discussion
Issued by NWS Central Illinois

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FXUS63 KILX 161626

Area Forecast Discussion
National Weather Service Lincoln IL
1126 AM CDT Mon Oct 16 2017

Issued at 1125 AM CDT Mon Oct 16 2017

High pressure has a firm hold on our weather today, with chilly
Canadian air accompanying the high. The 12z ILX sounding confirmed
the depth of dry air in place across central Illinois, and little
to no cloud cover is expected, even during peak heating this

Despite full sun and light southwest winds, high temperatures
will struggle to reach the low to mid 60s. Those highs look on
track, as mixing heights are expected to reach the base of the
morning inversion, and dry adiabatic descent to the surface
supports low to mid 60s.

Only minor updates were needed to hourly temps and dewpoints,
otherwise the current forecast is on track.


.SHORT TERM...(Today and tonight)
ISSUED AT 310 AM CDT Mon Oct 16 2017
High pressure is building into the midsection of the country this
morning...dominating much of the weather map. The cold front from
last night is well to the SE as the region is sitting under a
ridge axis from the Southern Plains into the Great Lakes. Weak
northwest flow aloft is expected to flatten out throughout the
period and quiet weather to continue with ridging anchoring the
weather through the work week.

In the shorter term, winds getting a southerly component to the
light westerly flow by the end of the day. Plenty of sunshine
should help to boost the temps into the low to mid 60s this
afternoon. Tonight, temps not expected to be quite as cold as this
morning. Concern for patchy frost south of Interstate 70 with the
lighter winds overnight. However, holding off on the mention for
now as the guidance is showing a general warming trend to the
lower 40s.

.LONG TERM...(Tuesday through Sunday)
ISSUED AT 310 AM CDT Mon Oct 16 2017

Extended forecast is very mild as temps climb to a few degrees
higher than climatological norms by tomorrow, and continue the
warming trend through the end of the week. By Friday, high
temperatures are expected in the low to mid 70s. Northwesterly
flow aloft today dampens into a more zonal pattern, shifting the
more active flow off to the north. Ridging remains in place over
the south/southeastern CONUS, effectively deflecting the
precip/impact of a mid week wave to the north. Forecast remains
dry and warming through the end of the work week.

Models agree with a break in the pattern moving into the weekend
with a more amplified wave digging in over the western half of the
CONUS. A cold front is slated to move through the region late
Saturday/early Sunday. Given the pops are out in Day 6/7, the
disparity in the models is expected. For now, chance pops move
through the forecast for next weekend, but details will be
shifting as to timing and strength.


.AVIATION...(For the 12Z TAFS through 12Z Tuesday morning)
Issued at 621 AM CDT Mon Oct 16 2017

VFR conditions will prevail at all TAF sites next 24hrs. With high
pressure ridge over the area, skies should remain clear at all
sites. Winds will be west-southwest this morning and then become
southwest during the day, then gradually becoming southerly
tonight. However, with speeds forecasted to be at 6kts of less,
will just have one line TAFs with southwest winds of 5-6kts.




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