Area Forecast Discussion
Issued by NWS Jackson, KY
Issued by NWS Jackson, KY
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196 FXUS63 KJKL 062311 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 711 PM EDT Thu Jun 6 2024 .KEY MESSAGES... - Isolated showers or sprinkles are anticipated through this evening ahead of a secondary cold front. - Cooler and noticeably less humid air will arrive behind this cold front and reside over the area Friday and into Saturday. - Another passing cold front will bring increasing rain chances to eastern Kentucky Saturday night into Sunday. - Cooler air will be reinforced across the region early next week, before temperatures modify back to above normal by the end of the period. && .UPDATE... Issued at 632 PM EDT THU JUN 6 2024 Modified slight chance (~15) PoPs for the near-term next few hours to accommodate latest observed trends based on satellite and radar. Otherwise, the forecast is on track with no significant changes. && .SHORT TERM...(This evening through Friday night) Issued at 438 PM EDT THU JUN 6 2024 Late this afternoon, an enlongated upper level low/trough extended from Alberta and Saskatchewan to the northern Great Lakes with a 500 mb trough axis extending south to the Lower OH Valley and into the Southeastern Conus. A weak impulse/shortwave is moving through the OH Valley ahead of this trough axis. Meanwhile an upper level ridge extended from northern Mexico north through the Rockies. Further northwest, a shortwave trough was moving into BC and the Northwest. At the surface, an area of low pressure was over Ontario with the frontal zone trailing into the Lower OH Valley to the Southern Plains. A ridge of sfc high pressure extended through the Central to the Northern Plains. This evening and tonight, the lead weak shortwave/impulse will move from the OH Valley to the mid Atlantic states as the 500 mb trough axis also approaches from the west. At the same time, the enlongated upper low/trough will trend to two closed upper lows one centered over the northern Great Lakes/Ontario and another centered over Saskatchewan. The 500 mb trough axis will move east of eastern KY late tonight to early on Friday. The associated frontal zone will will move across the Commonwealth as well. Mid level capping has kept upstream activity and cumulus rather shallow. However, there are some upstream returns. Some sprinkles or light showers will be possible with the boundary and the shortwave trough moving through the area through this evening. Clear or clearing skies and slackening winds despite drier air advecting into the region will probably set the stage for at least some patchy valley fog late tonight following recent wet weather. Sfc high pressure will build into the mid to Lower MS Valley as well as the southeast and OH Valley behind the boundary late tonight and through Friday combined with mid level height rises in the OH Valley. Following any early day valley fog, sunny or mostly skies are expected with a few passing cirrus and the potential for a few shallow cumulus developing during peak heating cannot be ruled out. The cooler and drier airmass ushered into the region will lead to highs about 3 to 5 degrees below normal. High pressure will continue working across the area on Friday night along with the mid level ridge as the next shortwave/system the one now near the BC coast and Pacific Northwest having moved near the US/Canadian border and then southeast into the Central Conus. A ridge/valley temperature split will be favored across the area, especially south and southeast for Friday night and valley fog at least along the largest creeks, ares rivers, and lakes is favored. .LONG TERM...(Saturday through Thursday) Issued at 530 PM EDT THU JUN 6 2024 At the start of the weekend, an elongated east to west trough, with several embedded vorticity maxima/closed lows, will be stretched from southeastern Quebec/northern New England to southern Alberta, while a subtropical ridge is centered across the north central Gulf of Mexico. Troughing will pivot southeast through the end of the week, reinforcing lower 500 mb heights across the Ohio and Tennessee valleys, with a passing surface cold front to bring increasing rain chances to eastern Kentucky Saturday night through Sunday. PoPs will peak in the likely range (40-70%) Sunday afternoon. Troughing will remain in place the majority of the time east of the Mississippi River through mid-week, although model agreement and smaller scale feature prediction becomes increasingly problematic with time. As such, have maintained at least a small chance of mainly diurnally-driven PoPs in place over the Ohio Valley each day, very close to the offered blended guidance. Temperatures will average below normal through Tuesday, with highs mainly in the 70s and lows in the 50s. Monday looks to be the coolest day overall, with highs in the low to mid 70s, and overnight lows in the lower 50s, with some upper 40s not out of the question in the typically colder valley locations. Stronger ridging building in over the central CONUS, will then spread increasing 500 mb heights over the Tennessee and Ohio Valleys Wednesday and especially Thursday, with highs returning to the 80s, and lows mainly back in the 60s. && .AVIATION...(For the 00Z TAFS through 00Z Friday evening) ISSUED AT 710 PM EDT THU JUN 6 2024 VFR conditions are expected through the TAF period, though there is some uncertainty with regards to brief morning fog formation at some terminals between 06z and 13z Friday morning. Brief reductions to MVFR visibility are possible with any fog formation. A weak cold front may lead to additional isolated showers moving from west to east through about 03Z. Winds will average west to northwest at 10 kts or less through the period, with a few gusts possible 15 to 20 kts Friday afternoon, mainly at KSYM. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ UPDATE...CMC SHORT TERM...JP LONG TERM...GEOGERIAN AVIATION...CMC