textproduct: Indianapolis

KEY MESSAGES

- Dense Fog Advisory in effect through 9am for the southern two- thirds of central Indiana

- Above normal temperatures expected today in the upper 70s to mid 80s.

- Dry weather expected today through the middle of next week.

FORECAST UPDATE

Issued at 359 AM EDT Thu May 28 2026

A Dense Fog Advisory has been issued for the southern two-thirds of the forecast area. Latest surface observations show visibilities have gradually dropped over the past several hours. Multiple sites are now reporting visibilities around a quarter of a mile or less. Meanwhile, traffic cameras within the advisory are also depicting more widespread fog development. Fog will likely continue expanding in coverage through daybreak.

If traveling through these areas this morning, be prepared for fog that could suddenly reduce visibilities to 1/4 mile or less. The greatest reductions in visibilities will be across more rural areas. Slow down and allow extra time to reach your destination. Expect the fog to dissipate by mid morning.

DISCUSSION (Today through Wednesday)

Issued at 302 AM EDT Thu May 28 2026

Current surface analysis shows surface high pressure centered near Lake Superior and central portions of Canada which stretches down into central IN. Subsidence from the high has provided mostly clear skies while keeping winds very light overnight. This combined with recent rainfall on Wednesday is promoting fog development this morning. The greatest coverage of fog will likely be near or south of the I-70 corridor as dry air filtering into northern counties should limit saturation. Patchy dense fog is also possible. If you are traveling through these areas, be prepared for sudden reductions in visibilities. Expect fog to dissipate by mid morning in typical diurnal fashion.

Guidance continues to depict an Omega Block pattern developing aloft with ridging centered over the central CONUS and central portions of Canada. Meanwhile, surface high pressure generally remains in control across the region. This will likely promote dry weather conditions through most or all of the forecast period. Expect another warm day today in the low to mid 80s with highs then holding nearly steady in the mid to upper 70s through early next week.

A few models have hinted at the ridge retrograding slightly, allowing for a shortwave to move in aloft early next week along with an associated cold front. These solutions are mostly outliers, but this will continue to be monitored as this could impact temperatures. Precipitation still appears unlikely even if a front does push through due to limited moisture return.

AVIATION (12Z TAF Issuance)

Issued at 635 AM EDT Thu May 28 2026

Impacts:

- Fog expected through 13Z, mainly near KHUF/KBMG

- Patchy dense fog possible near KBMG/KHUF through 13Z

Discussion:

Fog has developed near KBMG/KHUF/KIND and is expected to mix out by mid morning. KLAF remains drier with fog unlikely. The lowest visibilities are currently near KBMG/KHUF which could see visibilities as low as 1/4 mile over the next hour or two. Expect VFR cigs and vis through the period after the fog clears out.

NE winds will be around 5 kts or less through mid morning before increasing slightly. During peak heating of the day, NE winds of 07- 11 kts are expected. A few gusts up to 18kt cannot be ruled out, but the potential is far too low to include in the TAFs.

IND WATCHES/WARNINGS/ADVISORIES

Dense Fog Advisory until 9 AM EDT this morning for INZ043>049- 051>057-060>065-067>072.