![National Oceanic and Atmospheric Administration](/build/images/header/noaa.d87e0251.png)
![National Weather Service](/build/images/header/nws.4e6585d8.png)
![United States Department of Commerce](/build/images/header/doc.b38ba91a.png)
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
47
382 FXUS63 KIWX 110658 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 258 AM EDT Thu Jul 11 2024 .KEY MESSAGES... - Morning fog dissipates and may allow for a few afternoon showers and thunderstorms that have a chance to linger overnight. - Periodic chances for showers and thunderstorms between Friday and the middle of next week with the best chance for storms occurring during the afternoons. - 90 degree high temperatures are most possible Sunday through Tuesday of next week, dependant on thunderstorm chances. && .DISCUSSION... Issued at 300 AM EDT Thu Jul 11 2024 A relatively dry airmass is in place today with low to mid 60s dew points, but 850 mb dew points around 10C. This still allows for some instability to build in after the morning fog dissipates with 500 to 1500 J/kg of MUCAPE. The kicker shortwave that helped to push the remnants of Beryl eastward only slowly saunters through the Great Lakes region between today and Friday. A lack of upper and low level kinematic support exists limiting shear and this also limits severity to just general thunder mainly south of US-30 this afternoon. Locally heavy rain would be the main threat, which could be exacerbated by the already saturated ground. It is interesting to see models continue the convection tonight without shear and with waning instability perhaps along an outflow boundary and perhaps sustained with the antecedent low level moisture. The ECMWF has an area of warm advection and large scale ascent coupling at times tonight that may be able to sustain it. With the shortwave contuing to saunter through and ongoing showers and storms, Friday, will have to see if sunshine can peak through, but GFS/NAM/ECMWF all create 1500 to 2000 J/kg of MUCAPE, which will allow for more showers and thunderstorms Friday afternoon. DCAPE is still up between 800 and 1200 J/kg indicating wet microbursts could be observed in these storms. There is some signal of more of a moisture axis east of US- 31 on Friday and that seems to be where models are keying into providing PoPs. Highs Wednesday generally spanned the 70s, but with some increased sunshine and some warming in the low levels, temperatures will be able to reach around 80 degrees with a few spots south of US-24 able to reach into the low 80s. This is thunderstorm dependant though. Friday`s highs will also be thunderstorm dependant, but additional warm advection may allow for highs in the low to mid 80s. For Saturday into next week, a ridge over the southwestern CONUS slowly edges eastward into the Central Plains. This pattern will allow Pacific shortwaves to pass near the region through mid week. The first such wave arrives Saturday morning, continues into the day time, and will have some instability to work with, but shear and columnar moisture appear to lacking likely limiting the hazards as a result. A few more of these waves are expected to move through between Sunday and mid week next week providing opportunities for showers and thunderstorms. Through that time frame, an upper low forms across Central Canada and pushes a cold front through by Tuesday or Wednesday of next week. Friday night and Saturday, especially for areas east of IN-15 and north of US-6 have the best chance for a dry period. As mentoined previously, thunderstorms may be around the around area and that could cut into how warm temperatures could get, but Sunday through Tuesday still has the best chance to achieve 90 degrees before temperatures cool off behind the cold front. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 133 AM EDT Thu Jul 11 2024 Primary aviation concern is potential for fog later this morning given mostly clear skies, calm winds, and residual surface moisture. Latest concensus guidance (supported by area obs) shows a lot of variability and not expecting widespread/dense fog. KSBN still looks to have the better chance with brief IFR possible. Chances are much lower at KFWA but introduced a TEMPO 5SM. Otherwise there is a very low risk for isolated storms Thursday evening but confidence in coverage and timing is far too low to mention in the TAF`s. Winds will remain light and variable through the period. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...None. && $$ DISCUSSION...Roller AVIATION...AGD