IND issues Area Forecast Discussion (AFD) at Oct 18, 2:06 AM EDT080
FXUS63 KIND 180606
AFDIND
Area Forecast Discussion
National Weather Service Indianapolis IN
206 AM EDT Sun Oct 18 2026
.KEY MESSAGES...
- Widespread frost and localized freezing temperatures will occur
this morning
- A Freeze Warning is in effect for much of eastern and portions of
central Indiana, Frost Advisory elsewhere
- Dry and quiet weather persists through the next 7 days with
temperatures rebounding well above normal by midweek
&&
.DISCUSSION (Today through Saturday)...
Issued at 205 AM EDT Sun Oct 18 2026
Current observations show low 30s to mid 30s dew points across
the area of which matches up with the ongoing forecast of near to
below freezing temperatures over N/NE portions of central Indiana
and widespread frost over the remainder of the area. The one caveat
to this is E/SE portions of the Freeze Warning where current dew
points of 35-37.
The surface high will push off to the east on throughout the day,
allowing for weak S/SE flow to develop over the Ohio Valley by this
afternoon. This along with mostly clear skies will lead to a slight
rebound in temperatures with highs on Sunday expected to be in the
low 60s. Clear skies and dry surface conditions will continue large
diurnal swings, but there will be enough of an air mass change to
keep temperatures above freezing Sunday night into Monday morning.
Frost potential will remain high over NE portions of the area, but
headlines will depend if any hard freezes occur this morning.
Upper level riding will continue to build throughout the beginning
of next week leading to subsidence and dry conditions. Continued S/SW
flow west of the surface high will maintain the steady warming trend
early next week as well. 850mb temperatures are expected to increase
above 10C by Tuesday. This along with dry adiabatic lapse rates in
the PBL should lead to daily temperature above seasonal normals
Monday through Wednesday. Expect large diurnal swings to continue
with lows in the 40s.
By later in the week, mid to low level northerly flow upstream of a
building ridge will likely curtail daily temperature gains late next
week into the weekend with highs remaining in the low 70s.
Subsidence will remain high with continued large diurnal temperature
swings and dry conditions.
&&
.AVIATION (06Z TAF Issuance)...
Issued at 1243 AM EDT Sun Oct 18 2026
Impacts:
- None
Discussion:
VFR conditions are expected through the period.
A dry atmosphere will keep skies clear. Surface high pressure will
provide calm to light winds overnight, with winds becoming southerly
at less than 10kt on Sunday as the high moves east.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
Frost Advisory until 9 AM EDT this morning for INZ021-028-029-
035-043>045-047-051>055-060>064-067>072.
Freeze Warning until 9 AM EDT this morning for INZ030-031-
036>042-046-048-049-056-057-065.
&&
$$
AVIATION...Updike
DISCUSSION...Updike
Source:
IND issues Area Forecast Discussion (AFD) at Oct 18, 2:06 AM EDT---------------
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