FXUS63 KIND 240107 AFDIND Area Forecast Discussion National Weather Service Indianapolis IN 907 PM EDT Thu Oct 23 2025 .KEY MESSAGES... - Freeze Warning tonight and early Friday morning - Periodic chances for rain Sunday through the middle of next week - Near to below normal temperatures in the 40s and 50s next week && .FORECAST UPDATE... Issued at 907 PM EDT Thu Oct 23 2025 No changes needed to the forecast this evening. Continue to expect a cold night with temps dipping into the low 30s in urban areas and into the upper 20s in rural areas. Widespread frost and freeze conditions expected with a Freeze Warning remaining in effect. && .SHORT TERM (This evening through Friday)... Issued at 232 PM EDT Thu Oct 23 2025 A broad upper level trough continues to maintain itself over the eastern Canadian Provinces, ushering cold NW flow into the Ohio Valley. This cold air advection is addition in low level height rises today, resulting in a localized area of high pressure. Still, there is enough mid level moisture on the periphery of the upper trough for scattered diurnal cu across NE portions of the area, with clear skies elsewhere. This push of cooler air is keeping high temperatures this afternoon well bellow normal, with expected highs in the mid 50s. Tonight, the combination of much cooler air and building surface high pressure will provide us with the coldest night since April. These conditions will allow for efficient diurnal cooling with lows expected to drop well into the 20s near river valleys and near 30 elsewhere. For this reason, a Freeze Warning has been issued for all of central Indiana starting at 2AM, and continuing until 9AM tomorrow morning && .LONG TERM (Friday night through Thursday)... Issued at 232 PM EDT Thu Oct 23 2025 The large high pressure will continue to dominate the weather pattern Friday and Saturday with dry conditions expected beneath broad subsidence. The polar airmass will likely remain through this period, but greater overnight winds should allow for overnight temperatures to rebound slowly each day with lows in the mid 30s Friday night and low 40s Saturday night. With the strong high well establish across the eastern portion of North America this weekend, this should allow for anomalous streamwise vorticity across the Canadian Rockies, inducing height falls and a synoptic scale trough to form by early next week. Initially, this should lead to a weak shortwave across the southern Plains pushing eastward Sunday through Monday, and then a larger low pressure system to dive to the SE within the stronger supergeostrophic jet streak Tuesday and Wednesday. Ensemble members are still widely varied on the placement of both waves, but generally agree on the second low quickly diving south, and becoming detached from the Polar Jet next week. As is becomes detached, the steering flow wanes keeping this close low near the Ohio Valley into next weekend. Both systems should provide periods of rainfall next week, but will greatly depend on how the each low phases and tracks through the central US. With the first low likely to pass to the south and the closed low originating from the Canadian Rockies, near to below normal temperatures should remain within the long term. && .AVIATION (00Z TAF Issuance)... Issued at 722 PM EDT Thu Oct 23 2025 Impacts: - None Discussion: VFR conditions expected through the TAF period. Winds are diminishing this evening and will become light and variable overnight. After sunrise, a slight increase in speed is expected from a northwesterly direction. Speeds remain under 10kt on Friday. Some diurnal cumulus is likely during the afternoon hours Friday with high cirrus gradually increasing in coverage through the day.&& .IND WATCHES/WARNINGS/ADVISORIES... Freeze Warning from 2 AM to 9 AM EDT Friday for INZ021-028>031- 035>049-051>057-060>065-067>072. && $$ UPDATE...Eckhoff SHORT TERM...Updike LONG TERM...Updike AVIATION...Eckhoff