textproduct: Indianapolis

KEY MESSAGES

- Dry yet pleasant fall weather continues through early next week seasonably cool early mornings, above normal afternoon highs

- Patchy fog will occur in low lying areas late night/early mornings through Sunday morning

- A wetter pattern may take shape towards the Halloween weekend

FORECAST UPDATE

Issued at 941 AM EDT Fri Oct 23 2026

The forecast remains in good shape with only minor adjustments needed this morning. Latest observations depict patchy fog development in climatologically favored locations has mixed out under sunny skies. Surface high pressure across the region will continue to promote quiet weather conditions through the day. Look for plentiful sunshine to warm temperatures into the low 70s once again while winds remain light out of the southeast. Diurnal mixing should result in min RH values of around 30 to 40 percent during the afternoon.

DISCUSSION (Today through Thursday)

Issued at 308 AM EDT Fri Oct 23 2026

Pleasant yet increasingly dry pattern to continue through at least early next week, if not the entire forecast period...due to several factors, starting with stacked ridging over Indiana. Western North American trough splitting into active northern jet and southern cut-off will promote strengthening H500 ridging, which will extend from central Mexico to much of southeastern Canada by the start of the weekend, placing the local region under its eastern half. While same, nearly-stationary surface high pressure presently occupying most of the continent's eastern half...shifts to the Atlantic coast by Monday while still providing dry lower levels back into the Midwest.

This will translate to much of the same fair conditions seen so far this week, with subtle moderating trend to continue as thermal ridge axis aloft sliding over Indiana Sunday-Monday brings unseasonable warmth nearing 75F. Remarkably persistent calm/light winds should also continue to be the rule as pattern directs more active weekend storm well north across interior Canada. Likely a few clouds will return as small weaknesses embedded in the upper ridge cross the CWA. Patchy late night/early morning fog will also be a mainly isolated hazard through Sunday morning.

The latter half of the period will find the impressive ridge shrinking southward, allowing the next chilly air mass to slide east along the US-Canada border and smaller forcing to take a northern path into the Upper Midwest. Expect partly to mostly cloudy skies from associated fetch of moisture from southwest...yet continued mild conditions amid light southerly breezes. Low confidence in any precipitation in central Indiana through Thursday...ahead of some rain potential around the Halloween weekend.

AVIATION (12Z TAF Issuance)

Issued at 554 AM EDT Fri Oct 23 2026

Impacts:

- MVFR VIS in patchy ground fog possible until 13Z outside of KIND

Discussion:

Broad, stacked ridge will continue to prevail over central Indiana and vicinity through Saturday morning, allowing only a few high clouds and a light easterly breeze generally below 7KT this afternoon.

Carbon-copy of recent patchy and at times transient ground fog near KLAF/KHUF/KBMG both through 13Z this morning and again pre-dawn Saturday.

IND WATCHES/WARNINGS/ADVISORIES

None.