124
fxus63 kiwx 201704
afdiwx
area forecast discussion
national weather service northern indiana
104 pm edt mon apr 20 2026
.key messages...
- a return to well above normal temperatures starts tuesday.
- there is a 30% to 40% chance of showers, and perhaps a
thunderstorms, tuesday night. better chances (70-90%) of
showers and storms friday.
&&
.discussion...
issued at 104 pm edt mon apr 20 2026
after a cold start to the day, temps have rebounded somewhat into
the 40s and eventually some 50s as the caa wanes and shifts east. a
rapid return of warmer air commences tonight and through the
remainder of the week with the only hiccup being a weak disturbance
and associated sfc cold front that pushes through tuesday night with
scattered showers (isolated storm?) as steeping lapse rates and a
bit of an eml settle in with some upper level support. no severe
weather is expected and overall rain amounts should not be
significant.
wednesday into most of thursday night will feature dry and much
warmer conditions as a closed low moves along the international
border towards the area. a few showers or storms could arrive late
thursday night in the west, but better chances look to occur on
friday with likely to cat pops warranted ahead of this feature.
pwats over 1" may signal some locally heavy rain concerns, but the
system appears to be rather progressive so hopefully this doesn`t
become an issue.
temperatures will then drop back to more seasonable levels for this
weekend.
&&
.aviation /18z tafs through 18z tuesday/...
issued at 1256 pm edt mon apr 20 2026
a departing ridge of high pressure will result in light south
winds developing this evening. low level gradient will
strengthen overnight as the ridge shifts eastward and sfc
troughing reaches the eastern dakotas into south central
ontario. low level moisture advection will increase from this
pattern as better low level moisture takes circuitous route from
north texas to the corn belt into the southern great lakes.
greater chances of rain will remain northwest of the terminals
through this period but advection of the low level moisture
axis, steeper lapse rates moving in, and pre-frontal forcing
will lead to increased chances of showers/isolated storms
heading toward 00z tuesday evening. it will become windy again
on tuesday with southwest gusts to 25 to 30 knots.
&&
.iwx watches/warnings/advisories...
in...none.
oh...none.
mi...none.
marine...none.
&&
$$
discussion...fisher
aviation...marsili