


Area Forecast Discussion
Issued by NWS Northern Indiana
Issued by NWS Northern Indiana
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
011 FXUS63 KIWX 041024 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 624 AM EDT Fri Jul 4 2025 .KEY MESSAGES... - Today through Sunday - highs around 90 with heat indices around 90 to the mid 90s. - Isolated mainly afternoon and evening thunderstorms today. Dry Saturday. - Periodic chances for thunderstorms Sunday through Friday. && .DISCUSSION... Issued at 220 AM EDT Fri Jul 4 2025 Relatively hot and humid conditions are ahead for all three days of the extended holiday weekend as upper level ridging attempts to become established across the Ohio Valley region. High temperatures all three days over the forecast area will be around 90 into the lower 90s with heat indices reaching the mid 90s - but below heat advisory criteria. Temperatures should not be as warm Tuesday through next Friday with highs near 85 degrees. Along with the heat, there will be chances for thunderstorms each day through this upcoming 7 days - except for Saturday. As for these storms, weak impulses topping the upstream ridge and moving southeast across the Upper Midwest have the best chance for reaching the forecast area. Diurnal storms should remain isolated in the 19Z to 01Z window. Severe storms are not expected given very stable mid level lapse rates near 5.0C/Km. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 619 AM EDT Fri Jul 4 2025 VFR conditions expected through this TAF period with mainly light and variable winds with a slight uptick with diurnal warming after 15z today. Convection that originally developed over northern and central WI continues to move southward and is now moving through Chicago Suburbs. Expectation is that activity will fizzle out over Lake Michigan and before moving into either TAF site. However, still very uncertain whether or not any of the cells will survive and still have left mention out of the TAFs. Will continue to monitor these storms and update the TAF forecasts if current thinking changes. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...Air Quality Alert until midnight EDT tonight for INZ020. OH...None. MI...Air Quality Alert until midnight EDT tonight for MIZ177-277. MARINE...None. && $$ DISCUSSION...Skipper AVIATION...Andersen