Area Forecast Discussion
Issued by NWS Jackson, KY

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000 FXUS63 KJKL 152351 AAA AFDJKL AREA FORECAST DISCUSSION...UPDATED National Weather Service Jackson KY 651 PM EST Sun Jan 15 2017 .UPDATE...
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Issued at 651 PM EST SUN JAN 15 2017 Showers/light rain has become more widespread along and north of the Mountain Parkway over the last hour. As such, will be raising POPs to categorical, as most locations will measure. As forcing exits later on this evening, mid-level ridging will move in aloft, helping to promote stratiform build-down fog, as abundant low level moisture remains in place. As such, have issued a Special Weather Statement highlighting this concern.
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&& .SHORT TERM...(This evening through Monday night) Issued at 345 PM EST SUN JAN 15 2017 As of mid afternoon, an upper level ridge was centered near Florida with the ridge axis extending into the Southeastern states to Mid South Region. Meanwhile, a weak shortwave was moving through the OH Valley region while a broad trough encompasses much of the Western and especially Southwestern Conus. Within this trough, an upper level low was located over the Southern NM and far West TX area while a shortwave trough was digging south off the California coast. At the surface, an area of low pressure was moving from the Southern Rockies into the Southern Plains region with a warm front that extended east and became stationary across the Gulf Coast states and into the Carolinas. North of the boundary across the Lower OH Valley region, moisture remains in place within the rather broad frontal zone in place. Meanwhile, sfc high pressure was in place across the Eastern Great Lakes region with weak east to north flow across the area. Stratus build down across the area is leading to low clouds across all but the far south with visibilities already reduced on the ridges. Through this evening, the shortwave trough will move across the area this evening with another round of scattered to numerous showers and some drizzle or sprinkles across the far south. Behind this shortwave, the upper level ridge axis will move into the Lower OH Valley and Eastern KY while the upper level now nearing TX moves into the Southern Plains. Meanwhile the surface low will track into the KS and OK area. The stationary front meanwhile will begin to return north as a warm front into the TN Valley tonight. After the round of showers through this evening, moisture will become more shallow so the chances for getting measurable precipitation will likely end. However, the low levels will remain moist and this combined with subsidence associated with the ridge should lead to further stratus build down tonight and some sprinkles or patchy drizzle will be possible. Patchy coverage to areas of fog coverage is expected, especially on the ridgetops. The upper level ridge axis will move east of the area on Monday while the upper level low moves into NW MO and SW IA. The sfc low should move to northern MO by Monday evening. The upper level through will move into the western Great Lakes region with the sfc low also reaching southern Lake MI or MI by the end of the period. The warm front should lift north of the area by Monday evening into Monday night. Elevated instability will also be on the increase late especially in the southwest and west. Thus, much of Monday morning into mid afternoon should feature precipitation free weather and skies possibly brightening up a bit. However, as the warm front nears and the upper level system approaches, isentropic lift should bring another good chance for showers. A rumble or two of thunder cannot be ruled out late in the south and west. .LONG TERM...(Tuesday through Sunday) Issued at 230 PM EST SUN JAN 15 2017 Convoluted weather pattern throughout the long term period with split jet streams. Multiple closed lows will meander about the central part of the CONUS keeping southwest flow in place over our area and this will provide the one constant for the period: above normal temperatures. Relied heavily on the blended model guidance in this complex pattern. A cold front will be stretched out across the area Tuesday into Tuesday evening as a shortwave scoots across the Ohio Valley. This should provide for numerous showers during the day and cannot rule out a few thunderstorms with models showing some instability along with a fairly healthy 850 mb jet aloft. The chance for showers will linger into Wednesday morning as the front slowly works to our southeast. Timing is very suspect beyond Wednesday, but it appears now that we can expect a brief break Wednesday afternoon through Thursday morning. A southern stream disturbance then rides north-northeast out of Texas and this will bring renewed rain chances Thursday night into Friday. Saturday looks dry right now but another system ejecting out of the southwest appears to spread more rain across the area by Sunday. && .AVIATION...
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(For the 00Z TAFS through 00Z Monday evening) ISSUED AT 651 PM EST SUN JAN 15 2017 Light rain showers will continue to affect locations north of a line from JKL to PBX through 02z, before tapering off from west to east. Most locations will remain solidly IFR in ceilings, with ridges likely staying below airport minimums. Once the precipitation exits, low stratus/fog will likely build down into the lower elevations between 06 and 12z, bringing more widespread LIFR or worse restrictions. The fog will hang on through the mid- morning hours on Monday, before gradually lifting into the afternoon. Light east to northeast winds will gradually veer around to the south southeast late.
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&& .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ UPDATE...GEOGERIAN SHORT TERM...JP LONG TERM...ABE AVIATION...GEOGERIAN is the U.S. government's official web portal to all federal, state and local government web resources and services.