Area Forecast Discussion
Issued by NWS North Platte, NE
Issued by NWS North Platte, NE
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419 FXUS63 KLBF 150524 AFDLBF Area Forecast Discussion National Weather Service North Platte NE 1224 AM CDT Sat Jun 15 2024 .KEY MESSAGES... - Strong to severe thunderstorms are expected across portions of western and north central Nebraska this evening into tonight, with damaging winds as the main hazard. Large hail and locally heavy rainfall may also accompany the strongest storms. - The active weather pattern persists into next week, with daily chances of thunderstorms. Strong to severe thunderstorms are possible again Sunday evening and overnight. - Temperatures warm into the weekend before a cold front brings cooler temperatures for the middle of next week, though confidence remains low at this time. && .SHORT TERM /THROUGH SUNDAY/... Issued at 325 PM CDT Fri Jun 14 2024 For tonight, expect increasing instability early this evening across much of western and southwest Nebraska, as the surface warm front remains draped across central and northwest Kansas into northeast Colorado. Surface dewpoints will range in the lower 60s and MLCAPE values climbing to 1500-2000 J/kg, with higher values across far southwest Nebraska and northeast Colorado. An upper trough will extend across southeast Wyoming south across Colorado and New Mexico. A lead impulse is shown lifting northeast from eastern Colorado into western Nebraska and western Kansas early this evening, which will be the main focus for storms to develop upon. Lapse rates do steepen aloft somewhat with the approach of the upper trough. PWAT values look to increase to near 1.40 inches early this evening ahead of the storms. This will lead to widespread thunderstorm development across eastern Colorado late this afternoon. Deep layer shear near 25kts supports multicellular storms. Brief supercells could evolve at times, though this should only last a few hours before evolving into loosely organized clusters across southwest Nebraska by mid evening. This should lead to the formation of a cold pool and an increasing threat for damaging winds, especially for areas south of HWY 2. This is supported by recent runs of the HRRR. Guidance hints at least a local threat for significant damaging winds (75+ mph), and convective trends will need to be monitored closely this evening. Heavy rainfall will also be a threat where the convective complex tracks, and localized flash flooding is possible across southwest into portions of central Nebraska. On Saturday, the upper trough axis will progress into eastern Nebraska in the afternoon, with the warm front lifting into southern South dakota and the mid Missouri Valley. This will bring a warmup to the low 90s western Sandhills and southwest and mid to upper 80s east. A chance of lingering showers or isolated storms east in the morning. A slight chance for showers and storms developing in the panhandle in the late afternoon and moving east over the eastern panhandle and western Sandhills Saturday evening. A cold front will move into the northwest Sandhills overnight. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Issued at 325 PM CDT Fri Jun 14 2024 Active weather will return on Sunday. The cold front will stall out and become stationary by late afternoon. The location of the front remains uncertain, although some models locate the front near I80. This boundary will have to be monitored very closely, as dewpoints in the upper 60s to potentially the low 70s pool near the frontal boundary. Strong instability with SBCAPEs 2500-3500 and concerning shear profiles exist near this warm front. Any storms would quickly become supercellular should they initiate near the boundary. This could initiate late afternoon. A weak shortwave in southwest flow aloft will lift northeastward. A low confidence, but potentially high impact scenario exists as early as late afternoon into the evening hours, and this will be monitored very closely. A Marginal Risk is forecast near and north of Highways 2 and 91, however this may get adjusted further south and could also be upgraded to a Slight Risk. More widespread thunderstorm development is expected overnight north of the surface warm front across northern Nebraska, in the easterly upslope flow regime. The southwest flow aloft will persist across the region all next week, with near daily threats for thunderstorms persisting across western and north central Nebraska. Frontal passages and stalled frontal boundaries will exist. The threat for additional severe weather chances remains uncertain, though at least some threat looks to persist given the background synoptic regime. Highs Monday are likely to contrast from near 70 northwest to the low to mid 90s southwest. A cooldown in the 70s expected Wednesday, gradually warming to 80 to 90 by next Friday. && .AVIATION /06Z TAFS THROUGH 06Z SUNDAY/... Issued at 1224 AM CDT Sat Jun 15 2024 Early portion of the TAF period will be dealing with lingering showers/thunder through around daybreak with MVFR conditions, followed by a slow improving trend back to VFR. After some early gusts, winds will generally be 10kt or less through daybreak, then become a bit gusty 20 to 25kt late Saturday morning into the afternoon. && .LBF WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Roberg LONG TERM...Roberg AVIATION...MBS