56°F
Updated:
4/24/2025
11:21:53pm

Forecast Discussion
NWS Omaha/Valley, NE
897 FXUS63 KOAX 250350 AFDOAX Area Forecast Discussion National Weather Service Omaha/Valley NE 1050 PM CDT Thu Apr 24 2025 .KEY MESSAGES... - Scattered to numerous showers and storms will move through the area this afternoon and evening. Isolated severe weather and locally heavy rainfall are possible. - Friday afternoon through Saturday morning looks dry. - Thunderstorm chances return Sunday into Monday, with some severe weather threat, especially on Monday. && .DISCUSSION... Issued at 255 PM CDT Thu Apr 24 2025 Remainder of this afternoon through tonight... Synthesis of radar and satellite imagery as of 230 PM indicates a vorticity maximum over central NE, which is supporting a loosely organized shield of showers and thunderstorms across portions of eastern NE. More vigorous convection has recently developed just north of Hebron along an apparent surface boundary that extends east-northeast through portions of southeast NE and southwest IA. While considerable cloud debris and marginal boundary-layer moisture content have limited air mass destabilization so far today, filtered sunshine should allow for further destabilization this afternoon along and south of the surface boundary. That notion is consistent with latest CAM guidance, which indicates a gradual uptick in thunderstorm intensity later this afternoon into evening along or just south of the I-80 corridor. Locally backed surface winds along and just north of the surface boundary are resulting in enhanced low-level hodograph curvature with the current KOAX VWP indicating 0-1-km SRH of 200-250 m2/s2. A number of the CAM solutions indicate updraft helicity swaths with the simulated storms, which is consistent with the currently observed wind profile. So, despite the marginal instability, the potential exists for embedded supercell structures capable of hail up to quarter size, locally strong wind gusts, and perhaps a brief tornado or two through 7 or 8 PM. Locally heavy rainfall is also possible. Another round of showers and a few thunderstorms could move through the area late tonight; though no severe weather is expected with that activity. Friday and Saturday... Mid-level ridging will build over the central U.S. while a surface high progresses from the northern Plains into Great Lakes region. That pattern evolution will allow a drier low- level air mass to filter into the region Friday and Friday night with no precipitation expected during that timeframe. By Saturday, low-level moisture will begin to increase on the backside of the surface high, with the forecast indicating 15-20% PoPs across our western counties. High temperatures are expected to be mainly in the 60s both days. Saturday night through Sunday night... A prominent mid-level trough will progress through the Interior West, encouraging the development of a surface low over the northern or central High Plains on Sunday. As mentioned above, low-level moisture will begin to increase by Saturday, with that process being hastened by the development of a low-level jet (LLJ) during this timeframe. The 12z global models suggest that moisture increase coupled with steepening mid-level lapse rates will promote air mass destabilization, with the potential for periodic thunderstorm chances (peak PoPs of 40-60%) during this time period. While specific details remain uncertain, a few strong to severe storms appear possible. Gusty south winds on Sunday will draw a warmer air mass into the region with forecast highs in the 70s. Monday and Monday night... The 12z models indicate a complex upper-air pattern evolution, with an apparent lead shortwave trough progressing through the northern Plains into upper MS Valley early in the day Monday. That lead disturbance will then precede a neutral to positively tilted trough, which will overspread the northern and central Plains later Monday into Monday night. In response to those upper-air developments, the primary surface low is expected to develop from the northern Plains into upper Great Lakes on Monday with a trailing cold front progressing through the mid MO Valley. The cold front will serve as the focus for thunderstorm development Monday afternoon and evening. The early-day passage of the lead shortwave trough to our north may result in the veering of low-level winds within the pre- frontal warm sector, potentially reducing low-level hodograph curvature and resultant SRH. Nonetheless, ample deep-layer shear will combine with a moderately unstable air mass to create a favorable environment for supercells capable of all hazards. That notion is supported by various machine-learning systems, which highlight far eastern NE and IA with some of the highest severe-weather probabilities. Tuesday and Wednesday... Surface high pressure is forecast to build through the region Tuesday and Tuesday night, ahead of another frontal system, which is expected to move into the area Wednesday night. As such, the forecast will indicate a dry forecast Tuesday and Tuesday night with increasing PoPs Wednesday afternoon into Wednesday night. && .AVIATION /06Z TAFS THROUGH 06Z SATURDAY/... Issued at 1050 PM CDT Thu Apr 24 2025 Low clouds expanding across eastern Nebraska and western Iowa will sock in IFR/LIFR cigs overnight at the terminals. Low clouds will gradually improve to MVFR by Friday afternoon, but remain MVFR until clouds start to break up late in the day. Depending on how long it takes for clouds to break up we may keep MVFR conditions through the end of the TAF period, but could be as early as 00Z. Winds remain out of the north through the TAF period, becoming more northeasterly late in the day on Friday. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None. && $$ DISCUSSION...DeWald/Mead AVIATION...McCoy
NWS OAX Office Area Forecast Discussion
Forecast Discussion
NWS Hastings, NE
075 FXUS63 KGID 242346 AFDGID Area Forecast Discussion National Weather Service Hastings NE 646 PM CDT Thu Apr 24 2025 .KEY MESSAGES... - Shower and thunderstorm activity is expected to increase across north central Kansas (50-60%) late this afternoon and evening, with lower probabilities (20-40%) across south central Nebraska. Any severe weather should be primarily limited to our Kansas counties. - Mostly dry and seasonably cool temperatures return to the local area to end the week, with addition chances (20-50%) for showers and thunderstorms anticipated over the upcoming weekend. Despite the multiple chances for precip over the upcoming weekend, overall QPF amounts are expected to generally be less than 0.10". - Temperatures will spike in to the 80s on Monday ahead of a cold front from the north and an upper level low ejecting from the Rockies. Severe weather could be possible with this next system, although the focus has trended further east the past couple of days. - Additional shower and thunderstorm chances return next Wednesday/Thursday as the occasionally unsettled weather pattern continues across the plains. && .DISCUSSION... Issued at 122 PM CDT Thu Apr 24 2025 Widespread shower activity with a few isolated lighting strikes moved across the forecast area today. As this disturbance continues to push further east, a couple of thunderstorms have been able to develop across Fillmore county the past hour as it is tracking into a more favorable environment, but this activity should rapidly exit the area by 4 PM with the focus then shifting to our Kansas counties. For the late afternoon and evening hours...expect the potential for additional shower and thunderstorm development as another weak upper level disturbance moves across the area. While instability is not overly impressive, could see a few strong to marginally severe storms early in the period across north central Kansas where better instability resides. If realized, hail to the size of quarters and 60 mph wind gusts will be the primary concerns. Late this evening, could see some additional shower and thunderstorm development extend across south central Nebraska, although this activity should be non-severe and diminish by daybreak Friday. As the showers and thunderstorms diminish, could also see a bit of fog development, especially considering the moist ground and light northeasterly winds, but fog is not expected to be widespread. For the daytime hours Friday, skies will likely remain mostly cloudy through the daytime hours with seasonably cool temperatures and mostly dry conditions anticipated. Additional weak disturbances in southwesterly flow aloft will bring additional chances for showers and thunderstorms over the upcoming weekend. Given the more disorganized look of this activity, anticipate more clouds than rainfall over the upcoming weekend when all is said and done. Temperatures will then spike into the 80s next Monday ahead of a cold front expected to cross the area Monday night. Just ahead of this cold front, and upper level low is expected to eject out of the Rockies and cross the plains, potentially acting as a trigger for shower and thunderstorm development Monday afternoon and evening. While severe storms will be possible with this set-up, the threat has trended further east, and confidence in severe storms locally has decreased. Dry weather should then return for Tuesday before additional small chances for precip return toward the middle of next week. Overall, an unsettled weather pattern continues with nearly daily chances for at least some precip across the region. && .AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 645 PM CDT Thu Apr 24 2025 For KGRI/KEAR Airports: Significant weather: LIFR CIGs and MVFR VSBYs tonight into Fri morning. Tonight: Likely LIFR much or all of the night as stratus has already lowered to 300-400ft...and don`t see much to change that anytime soon. VSBYs are a bit more uncertain, but seems plausible for some MVFR to continue to mix in with VFR. The steady Nrly wind 9-13kt should keep VSBYs from getting worse to IFR category. Removed all of the potential for convection tonight as it appears we`ll be too stable. Did leave in a PROB30 group, though, for some showers that could try to work their way in from the W late tonight into early Fri AM. Confidence: High. Friday: Should slowly improve from LIFR to IFR CIGs 13-15Z, then IFR to MVFR around midday into early aftn. VSBYs should be primarily VFR thanks to moderate Nrly winds 10-15kt, gusting 20-25kt. Mainly dry conditions expected. Confidence: Medium. && .GID WATCHES/WARNINGS/ADVISORIES... NE...None. KS...None. && $$ DISCUSSION...Rossi AVIATION...Thies
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