849 FXUS63 KOAX 240449 AFDOAXArea Forecast Discussion National Weather Service Omaha/Valley NE 1149 PM CDT Tue Sep 23 2025
.KEY MESSAGES...
- Showers and perhaps a few isolated storms will linger into Wednesday morning, mainly south of Interstate 80. Additional rainfall amounts of 1/4 to 1/2 inch are expected in most areas, though a few isolated pockets of 1" are possible (20-30% chance).
- A few sprinkles are possible Wednesday afternoon (10-15% chance) with highs remaining in the 70s.
- Dry and warmer weather favored Thursday into next week, with highs in the upper 70s to lower 80s.
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.DISCUSSION... Issued at 334 PM CDT Tue Sep 23 2025
Early afternoon analysis showed a very positively tilted upper level trough axis stretching from a cutoff low over the Great Lakes to another cutoff low over CO and toward the Four Corners region. Associated precip stretched from CO, along the NE/KS border and into IA/MO. The band of precip is expected to linger in areas near/south of I-80 tonight with some guidance still hinting at some heavier shower or isolated storm development in that area later this afternoon into early evening. Currently not expecting those to be too impactful with only some very isolated pockets of perhaps 1" of additional rain and a more widespread 1/4 to 1/2". However, if the heavier rain happens to fall somewhere that received heavy rain last night (e.g. southern Johnson county), some localized flooding could occur.
Lingering precip associated with the main wave should exit south by mid to late Wednesday morning. However, another weak shortwave rounding the back side of the cutoff low over the Great Lakes will slide through the forecast area, and combined with a little instability in the cloud layer, could lead to some sprinkle/light shower development Wednesday afternoon (10-15% chance). Otherwise, northerly winds will keep temperatures right around average for this time of year, with highs in the mid 70s for most. The trough axis pushes off to the east Wednesday night into Thursday with upper level ridging setting up for the remainder of the period. This will lead to dry and warmer conditions into next week with highs mostly in the upper 70s to lower 80s.
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.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 1149 PM CDT Tue Sep 23 2025
VFR conditions will prevail throughout the TAF cycle. Mid to high-level clouds will keep pushing southeast early in the period. Fog potential has shifted farther southeast away from terminals for early this morning. Will see diurnally driven cumulus develop at around 4 to 5kft after 17z then dissipating after 23z. Terminals may see a few pop up showers in the afternoon as well, but confidence in this occurring is low at about a 10 to 15% chance.
Winds will remain light under 12kts and generally from the north northeast.
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.OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None.
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DISCUSSION...CA AVIATION...Castillo
NWS OAX Office Area Forecast Discussion