textproduct: Indianapolis

KEY MESSAGES

- Dry and pleasant weather expected today through next week.

- Near-average temperatures, highs near 80, lows in 50s/60s.

- Isolated showers Monday; next best chance for widespread rain will be on Saturday

DISCUSSION (This evening through Sunday)

Issued at 236 PM EDT Sun May 31 2026

Fairly quiet start to Meteorological Summer ahead as ridging dominants the weather pattern locally over the next week. There will be some subtle changes in the overall set up, but sensible weather at the surface should remain fairly consistent with mainly dry conditions and near normal temperatures.

An upper level omega blocking pattern is currently set up over the CONUS with a thin ridge axis from Winnipeg, Manitoba southeastward to the lower Mississippi Valley. Indiana remains just to the east of the ridge axis, which is acting as almost a wall keeping any convection south and west of Central Indiana. Surface high pressure resides over Ontario for the next few days resulting in northeasterly flow keeping a drier airmass in place for this time of year and temperatures largely around average with highs in the 70s to near 80 and lows in the 50s to near 60.

Minor change to the overall pattern occurs tomorrow as the omega block briefly reorients itself and ridging sharpens over the Plains, placing Indiana within a northwesterly flow pattern aloft. The NW-SE boundary which had been in place over the Plains, keeping storms away from Indiana, briefly shifts eastward tonight, potentially placing portions of the state in the vicinity of the storm track. High pressure at the surface will still be the dominant weather influence locally keeping the low levels fairly dry, so not expecting widespread rain or storms in the area; however CAMs guidance has been consistent in showing the potential for some precipitation Monday morning and afternoon. A shortwave within the NW flow aloft dives southeast into Illinois tonight, sparking off a nocturnal MCS just to the south and west of Central Indiana. This system could impact far western and southwestern Indiana in the morning hours, then additional showers may develop during peak heating of the day along leftover boundaries. Keeping 20-30 PoPs across Central Indiana for tomorrow. Confidence is still low on how the mesoscale features will evolve upstream going into tonight and tomorrow as CAMs struggle in these situations. Will raise PoPs as needed based on trends later this evening and tonight in Illinois and Missouri. Overall not expecting a washout of day for Monday, but thicker cloud cover and isolated to scattered showers with highs in the 70s is the most likely outcome.

For the rest of next week, upper ridging redevelops overhead while high pressure over Canada shifts southward into the southeast CONUS. This pattern supports continued dry conditions for Central Indiana with a warming trend by next weekend as flow becomes southwesterly. Expect highs to gradually warm into the mid 80s by the end of the week with lows in the mid 60s as humidity values gradually increase. Longer range guidance introduces the chance for rain and storms by Saturday the 6th as Gulf moisture streams northward along a boundary. Will be monitoring the storm threat next week and updating the forecast daily as confidence increase on the exact pattern evolution and associated threats to Central Indiana.

AVIATION (00Z TAF Issuance)

Issued at 747 PM EDT Sun May 31 2026

Impacts:

- Isolated showers possible Monday

Discussion:

Largely quiet weather expected for the TAF period, but can't rule out the potential for isolated showers Monday as hinted by CAMs. Confidence isn't enough to mention in the TAF itself. VFR conditions will persist through the period as high pressure northeast of Indiana continues to provide dry lower level easterly flow across the TAF sites. High cloud caught up within the upper ridging to the west will continue to stream in overhead, becoming thicker into tonight.

Winds will be light and variable to calm at times through tomorrow. Generally, the direction will be out of the east.

IND WATCHES/WARNINGS/ADVISORIES

None.