Hello NSCO community! I greatly apologize for this large gap in between posts, and get ready for some awesome breakdowns of Nebraska's weather these past few weeks! This past week across Nebraska featured a continuation of warm, dry, and increasingly fire-prone conditions as much of the state remained well above normal for mid-May temperatures. Afternoon highs frequently climbed into the upper 70s and 80s statewide, with some western and southwestern locations nearing the lower 90s by late week. Omaha and eastern Nebraska generally remained in the upper 70s to mid-80s early in the week before warming into the upper 80s later in the week, while Kearney, North Platte, and Scottsbluff in the central, west, and northwest portions of the state experienced some of the hottest temperatures statewide with widespread 80s and isolated 90 degree readings. Valentine and O’Neill also remained warm and dry with breezy conditions persisting through much of the forecast period. Humidity values frequently dropped into the teens and lower 20s during the afternoon hours, especially across central and western Nebraska, leading to widespread elevated to critical fire weather concerns. Red Flag Warnings were issued across portions of north-central, central, and western Nebraska due to strong winds, critically low relative humidity, ongoing drought conditions, and dry fuels. Precipitation remained very limited across the state, with most areas staying completely dry outside of a few isolated sprinkles and very low-end thunderstorm chances.
Looking at our upper atmosphere, an amplified upper-level ridge dominated much of the western and central CONUS throughout the week, supporting persistent warm-air advection and above-normal temperatures across Nebraska. At the surface, multiple weak frontal boundaries pushed through the region, though they brought little moisture and mainly served as wind-shift boundaries. At 850 mb, strong southerly flow redeveloped by midweek with winds increasing to near 50 knots over northeastern Nebraska ahead of an approaching shortwave trough. This aided in transporting warmer air and, later in the forecast period, modest amounts of Gulf moisture northward. At 500 mb, ridging remained the dominant feature through much of the week before a northern Plains trough gradually approached by the weekend. Meanwhile, 300 mb jet energy largely remained displaced north of Nebraska early in the week, though stronger upper-level support began increasing by Saturday into Sunday as a trough deepened over the northern Plains. This evolving pattern helped support increasing thunderstorm and rainfall chances heading into the weekend while also maintaining strong pressure gradients and windy conditions during the midweek period.
Several notable weather features impacted the state throughout the week. A cold front pushed through Nebraska early Tuesday, shifting winds northerly while maintaining extremely dry conditions behind the boundary. Strong pressure gradients and efficient daytime mixing allowed wind gusts to frequently reach 30 to 45 mph across western and north-central Nebraska. By Wednesday and Thursday, southerly return flow strengthened ahead of an approaching trough and developing lee cyclone over the High Plains. A dryline was forecast to set up somewhere between Highways 61 and 83 across western Nebraska, separating higher dewpoints to the east from very dry downslope air over the Panhandle and Sandhills. Several forecast discussions also noted the presence of a strong low-level jet Wednesday night into Thursday morning, which contributed to increasing fire danger and stronger overnight winds. Although isolated showers and thunderstorms were possible at times, strong capping and dry sub-cloud layers limited widespread precipitation development. Some elevated convection and dry lightning concerns were noted across western Nebraska and portions of the Panhandle, particularly where inverted-V soundings favored gusty outflow winds.
Precipitation across Nebraska remained sparse for most of the week, with many areas receiving little to no measurable rainfall. Eastern Nebraska, including Omaha and surrounding areas, only carried isolated 20–40% shower and thunderstorm chances through Thursday before better rainfall opportunities shifted toward the weekend. Western and central Nebraska similarly stayed mostly dry despite occasional weak disturbances and elevated convection attempts. Forecast guidance consistently highlighted Saturday night through Monday as the best opportunity for more widespread appreciable rainfall and thunderstorm activity statewide. Gulf moisture was expected to increase substantially by the weekend, with dewpoints climbing into the 60s across portions of central and eastern Nebraska. This moisture return, combined with increasing instability and stronger upper-level forcing, supported the potential for organized thunderstorms and some severe weather. Forecast discussions noted the possibility for strong storms with large hail, damaging winds, and locally heavy rainfall, especially Sunday as a cold front moved through the region.
Temperature and precipitation extremes this week highlighted the persistence of abnormal warmth and dry conditions across Nebraska. Maximum high temperatures generally ranged from the upper 80s to lower 90s across western and southwestern Nebraska, particularly near Scottsbluff, North Platte, and portions of the Sandhills. Minimum afternoon relative humidity values frequently dropped into the 10–20% range statewide, especially west of Highway 83 where fire weather conditions became most critical. Wind gusts commonly exceeded 35 mph, with isolated gusts approaching 45 mph in western Nebraska and the Panhandle. Rainfall totals remained very limited for much of the state, though the forecast increasingly pointed toward more widespread precipitation opportunities entering the upcoming weekend period.
