textproduct: Indianapolis

KEY MESSAGES

- Dry through Saturday with most days at near to above normal temperatures 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

- Rain chances return beginning early Sunday

FORECAST UPDATE

Issued at 1019 AM EDT Tue Oct 6 2026

No significant updates needed to the forecast this morning. Made very minor adjustments to temperatures and dew points in anticipation of efficient boundary layer mixing. Under conditions that feature strong solar insolation, clear skies, and light winds...temperatures tend to be a few degrees above guidance, while dew points are a few degrees below. Nudged each in those respective directions. This results in afternoon relative humidity minimums between 25 and 35 percent. Fire weather conditions should be mitigated by light wind speeds today along with still-green plant matter.

DISCUSSION (Today through Monday)

Issued at 126 AM EDT Tue Oct 6 2026

Yet again, Big Bubble, No Trouble through the remainder of this week, though low rain chances return for the latter half of the weekend into early next week.

Dry weather is forecast through at least Saturday due to the expansive influence of strong surface high pressure. Broadly cyclonic flow will be in place over the region, though any forcing from shortwave troughs pivoting through this flow will be displaced well to the north, leaving the primary impact to the area to be mild temperatures and low humidity through the week.

Temperatures will be mild and pleasant, with substantially less humid conditions than experienced in recent weeks. Fluctuations are expected as a dry cold front produces some late work week moderation in temps, though each day should still be quite pleasant with cool mornings and mild to warm afternoons.

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. With the possible arrival of increased moisture late in the weekend, these values will improve.

That said, forestry partner input indicates live fuels are moist enough to help slow any fire spread, and overnight relative humidity recovery is helping to mitigate fire danger overall, though conditions still require monitoring.

Again, low rain chances return late Saturday night into early next week as a possible tropical remnants from the western Gulf move northward and begin to undergo extratropical transition. Uncertainty precludes more than low chances at this time, though this will bear watching as a transitioning tropical cyclone and quick hit of tropical moisture could produce some heavy downpours and some increased winds depending upon the track.

AVIATION (12Z TAF Issuance)

Issued at 257 AM EDT Tue Oct 6 2026

Impacts:

- Shallow ground fog possible again late tonight

Discussion:

Surface high pressure will remain in control across the area during the period, leading to clear skies and predominantly VFR conditions.

The exception may be at the outlying sites in the 2-3 hours prior to daybreak late tonight. Multiple mornings have seen rapid visibility reductions and quick recoveries, with significant fluctuations in shallow ground fog. This is far too uncertain for inclusion at this point, but is worth noting as an ongoing possibility.

Winds become more southerly today, remaining less than 10KT.

IND WATCHES/WARNINGS/ADVISORIES

None.