670
FXUS63 KILX 040502
AFDILX

Area Forecast Discussion
National Weather Service Lincoln IL
1202 AM CDT Thu Jun 4 2026

.KEY MESSAGES...

- Dry conditions and low humidity continue through tomorrow,
  with high temperatures reaching the 80s.

- A pattern change brings increased humidity and frequent
  thunderstorm chances starting Friday and continuing into next
  week. Afternoon heat indices will likely peak in the upper
  80s to mid 90s for Saturday and beyond.

&&

.DISCUSSION...
Issued at 136 PM CDT Wed Jun 3 2026

High pressure is set up over the Great Lakes region again today,
which is dominating the weather pattern for much of this week. Dry
conditions, light winds, and limited cloud cover are supporting
large diurnal swings with highs today in the mid 80s and lows
tonight in the upper 50s.

Starting tomorrow, the high pressure center will drift off to the
mid-east coast, shifting the flow to a more south-southeasterly
direction. This will support increasing moisture as we go into
the weekend. Highs will increase to the upper 80s, potentially
90 in some spots, with dewpoints in the mid 60s to low 70s for
Friday into Monday. Heat indices could bump north of 90 degrees
by Saturday and looks to potentially continue into the new week.
In conclusion... summer has arrived.

The ridging pattern starts to break up Friday as a shortwave pulses
through the region, bringing rain chances into the forecast. The
showers and thunderstorms on Friday into Saturday appear to have the
ability to be efficient rain producers with PWATs around 1.6-1.9
inches. However, the forcing will be pretty weak, making coverage of
the showers and thunderstorms not as widespread as we would like,
with the recent dryness we have experienced. The higher rainfall
amounts will be localized where multiple showers or thunderstorms
pass over the same area during this time. The shear is weak during
this wave, so a severe weather risk should stay minimal.

The long range forecast remains uncertain at this time, starting
early next week. By midweek (next week), the upper level flow is
questionable on how it will be set up. There does appear to be the
possibility of a few more weak rounds of convection into net
Wednesday. The extended forecast relies heavily on the NBM due to
that uncertainty. Looking beyond the seven-day window, the CPC 6-10
day outlook highlights a strong signal for a persistence of above-
normal temperatures across the central U.S.

&&

.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...
Issued at 1201 AM CDT Thu Jun 4 2026

VFR conditions persist through the period, with increasing high
cloud coverage. SSE winds overnight will turn to SW by 14-15z,
becoming sustained around 12-15 kts during the day. Winds weaken
slightly after sunset and shift slightly to SSW.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

KEY MESSAGES...Copple
DISCUSSION...Copple
AVIATION...Erwin