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Lucerne, Indiana Weather Forecast Discussion

401
FXUS63 KIWX 222334
AFDIWX

Area Forecast Discussion National Weather Service Northern Indiana 734 PM EDT Mon Sep 22 2025

.KEY MESSAGES...

- A very active weather period will continue through Friday with numerous showers and isolated thunderstorms.

- Flooding is not anticipated.

- High temperatures the rest of the week will be in the 70s.

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.DISCUSSION... Issued at 214 PM EDT Mon Sep 22 2025

A positively tilted trof will settle south across the Upper Great Lakes region. This system will bring numerous showers to the forecast area as well as an occasional chance for a thunderstorm at times. WPC rainfall amounts of generally 1.00" to 1.50" are forecast through Friday. Heavier rainfall amounts so far today (as of 1 AM EDT) have been generally 0.25" to 0.50" over northeast Indiana and northwest Ohio. A short break in the heavier rain is expected before another upper level trof brings more rain Tuesday. Moderate drought conditions (D1) covered most of northern Indiana and northwest Ohio. Ft Wayne observed rainfall amounts since August 1st has been less than 2 inches (1.90) which is the 2nd driest in 130 years. So far, the rain that has fallen has not been sufficient to improve drought conditions.

While isolated to scattered showers are possible at time through Tuesday morning, more organized rainfall should develop Tuesday afternoon with the next impulse that moves across the area. The new WPC forecast indicates around a half inch of additional rain through 8pm Wednesday evening is forecast. Limited impacts are expected with this precipitation. Very minor rises on some rivers have been noted with this past round of rain. This next round of rain into Wednesday night should do little to effect river conditions.

Otherwise, dry weather if forecast from Friday night into early next week. Temperatures are expected to be near normal.

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.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... Issued at 726 PM EDT Mon Sep 22 2025

As this trough pulls away, the left over moisture gets trapped under a forming inversion. There is definitely some uncertainty around whether the TAF sites will be affected by fog or stratus or both, but these tafs will run with the idea that SBN is affected by fog given they had clouds scatter out before sunset. FWA has the potential to see both stratus and fog. There`s also uncertainty around how low flight conditions go at both sites. Aviation guidance seems to point toward brief low MVFR or IFR conditions at SBN given their ability to scatter out before sunset, but lowered flight conditions look to stay longer and go lower at FWA, perhaps into LIFR. LAV guidance from both sites indicates weak sub-5 kts sustained winds which would point to some possibility for fog than if it was 5 kts or above at their lowest, which would point to solely a stratus situation. Have pulled SBN out of fog at around 13z with these tafs, but RAP time sections keep the low level saturation into the afternoon so wouldn`t be surprised to see it last longer than that. Will pass this along to the next shift to hone in on. FWA looks ready to give up its buck in the mid to late morning as it heads back into VFR.

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.IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...None.

&&

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DISCUSSION...Skipper AVIATION...Roller

NWS IWX Office Area Forecast Discussion

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