textproduct: Omaha/Valley

KEY MESSAGES

- Dense fog expected to develop over a large portion of our area overnight clearing by around 10 am Thursday.

- Temperatures trend warmer going into the weekend. Seasonably warm weather expected over the weekend.

- Periodic chances for storms return starting Friday night through the weekend. Low chances for severe storms Friday and Saturday nights.

- Wildfire smoke continues to drift in from the north, with only small amount reaching the surface.

DISCUSSION

Issued at 946 PM CDT Wed Aug 5 2026

Satellite shows broad troughing over the Central US with ridging in place along the East and West Coasts. This trough has brought a cooler Canadian air mass south into the Northern Plains which, combined with cloud cover, is why temperatures were so cool today. Shower and storm chances have dropped south of our area along with the cold front. A few showers may still clip Falls City overnight tonight, but the rest of our area will remain dry.

Overnight we'll start to see building gp-heights with the ridge to our west slowly expanding eastward. This combined with clear skies and calm winds over the northern 2/3rds of our area should support significant fog development. To the south, clouds have been slow to clear, but we could still see some fog develop over these areas as well, especially if we see more clearing overnight. Some of this fog across our area will likely be dense, and expect at some point we'll need a Dense Fog Advisory for a large portion of our area.

Thursday starts out foggy but this should clear by 10am. The expansion of the ridge eastward as well as increasing southerly flow will lead to warmer temperatures. High temperatures should reach into the low-to-mid 80s across the area, with some spots in northern Knox County approaching 90.

We'll remain on the east side of this stationary ridge going into the weekend. With increased southerly flow ahead of a developing area of low pressure on the lee-side of the Rockies, we'll see temperatures climb into the upper 80s to low 90s over the weekend. There is some uncertainty in high temperatures due to the GFS's tendency to over-mix, which causes a significant warm bias in these patterns. The ECMWF and other long-range models are significantly cooler with highs staying int he upper 80s to low 90s. Rain chances and lingering cloud cover could dampen daytime highs as well. Shortwaves riding down the eastern side of the ridge will tap into the moisture advecting in from the Gulf leading to nocturnal storm chances starting Friday night through the weekend. Some of these storms could become severe, particularly on Friday and Saturday due to the strengthening nocturnal LLJ and enhanced shear near a lingering frontal boundary across our area. Periodic rain chances continue into early next week with temperatures staying near normal.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

Issued at 529 AM CDT Thu Aug 6 2026

Areas of dense fog have developed this morning, bringing widespread LIFR to IFR conditions. Conditions will gradually break up and improve in the 06/14-16Z timeframe, with a return to VFR conditions at all terminals by 06/18Z. Winds will generally remain calm and out of the south over northeast Nebraska, becoming more easterly towards southeast Nebraska. A few 12-18 kt gusts will be possible at KOFK during the afternoon.

OAX WATCHES/WARNINGS/ADVISORIES

NE...Dense Fog Advisory until 10 AM CDT this morning for NEZ015>018- 030>034-042>045-050>053-065>068-078-088>093. IA...Dense Fog Advisory until 10 AM CDT this morning for IAZ043-055- 056-069-079-080-090-091.