textproduct: Indianapolis

KEY MESSAGES

- Dry and pleasant throughout the next week with mild days and cool nights expected under the influence of high pressure

- Fire weather conditions will require monitoring as several afternoons will likely feature minimum RH values well down into the 30s if not lower at times

FORECAST UPDATE

Issued at 947 AM EDT Sat Oct 3 2026

Forecast is in great shape this morning. High pressure will provide plentiful sunshine and dry conditions today. With a dry atmosphere and the sunshine, temperatures will rebound nicely to forecast highs. Tweaked hourly forecasts to match latest observations, but otherwise no changes were made.

DISCUSSION (Today through Friday)

Issued at 112 AM EDT Sat Oct 3 2026

Autumn announces itself in a big way through the next week, with much milder conditions and a prolonged dry spell under the influence of two strong areas of surface high pressure.

Dry weather is forecast throughout the next seven days due to the expansive influence of the aforementioned surface high pressure. Broadly cyclonic flow will be in place over the region, though any forcing shortwave troughs pivoting through this flow will be displaced well to the north, leaving the primary impact to the area to be much milder temperatures through the period.

Some moderation of temperatures is expected mid to late next week, with 80 degree readings likely pushing back into portions of the region, but substantially less humid conditions than experienced in recent weeks. This leaves the primary weather hazard of concern as fire conditions, with afternoon relative humidity values likely to drop into the 30 percent range on many if not most days, and possibly even lower as blended guidance often struggles to fully capture the degree of mixing out of dewpoints in the afternoons with plentiful sunshine, even in settings with relatively light surface flow.

Additionally, there is at least a low chance for patchy frost mainly northeast Monday night into Tuesday morning as lows will have the potential to drop into the upper 30s. Current numbers appear too warm to support anything widespread or significant, but if we can drop a couple/few more degrees in the outlying areas this may be on the table.

In any case, several days of pleasant Autumn weather are expected over the next week, and all are encouraged to enjoy the abrupt shift into mild fall days and cool nights.

AVIATION (12Z TAF Issuance)

Issued at 410 AM EDT Sat Oct 3 2026

Impacts:

- None

Discussion:

Few to no operationally significant weather impacts are expected at the sites during this period under the influence of expansive surface high pressure, bringing largely clear skies, winds veering from the northeast to the east, and unrestricted visibility.

Sustained winds will be 4-8KT this morning, becoming near 8-10KT through the day, then dropping back to 5KT or less tonight.

IND WATCHES/WARNINGS/ADVISORIES

None.