Area Forecast Discussion
Issued by NWS Jackson, KY

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000 FXUS63 KJKL 291253 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 753 AM EST Tue Nov 29 2016 .UPDATE...
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Issued at 753 AM EST TUE NOV 29 2016 Showers have just about moved out. Clouds are less extensive than earlier forecasted, and central KY is mostly clear. Based on this and forecast soundings, have lowered the sky cover forecast for today.
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&& .SHORT TERM...(Today through Wednesday) Issued at 443 AM EST TUE NOV 29 2016 Rain was ongoing over the southeast portion of the forecast area early this morning, but the back edge was progressing toward the Virginia state line. The rain was occurring near a cold front moving east through Kentucky. The parent low is deep, stacked, and very wound up over the north central CONUS. Its initial cold front trying to pass through at our latitude is becoming oriented nearly parallel to the upper level flow, and is slowing down and losing its identity. It will not result in any real cooling. Instead, another upper level impulse rotating around the large scale low/trough will support a second cold front moving in from the west tonight. Low level flow ahead of this front and around the large scale low will advect mild and humid low level air (by November standards) into our area late today and tonight. This eventually results in unstable soundings during the night. The smaller scale models such as the WPC NAM and the NSSL WRF are indicating convection breaking out during the night and moving east into the region. Forecast soundings suggest it will be mainly elevated, but show some potential to become briefly surface based just ahead of the cold front. Shear is expected to be very strong, which certainly does cause concern for severe wx potential, especially if the convection can become surface based. Have noted SPC`s outlook, with slight risk now into the southwest part of the forecast area. Lingering precip will probably last into Wednesday morning, but will taper off for the afternoon as the cold front moves east of the area, a much cooler air mass arrives, and most moisture above 850 mb is lost. .LONG TERM...(Wednesday night through Monday) Issued at 235 AM EST TUE NOV 29 2016 Extended starts off with good model agreement and confidence, but by the end of the weekend into next week, confidence is as low as you can get with models all over the place with possible solutions. In general, expect any remaining showers to quickly exit the area Wednesday evening with dry weather returning for the remainder of the work week thanks to a surface ridge that will spread in over the region. Despite the ridge, cooler weather will persist through Saturday with temperatures slightly below normal for this time of year. By Sunday, models continue to show poor agreement on how much energy ejects out of the southwest CONUS and into our region. 00z ECMWF has backed off slightly on the strength of the system, but still has a decently wrapped up system coming across the area with some very high rainfall totals. Meanwhile, GFS brings a much weaker system across the area with very little rain. This operational run has some support of the GFS Ensembles. Depending on how much energy initially ejects out from the southwest will lead into what happens early next week. Thus, with the low confidence, opted to stay close to climatological rainfall chances (generally around 20 to 30 percent) from Sunday through the end of the period. Right now, the best rain chances look to be on Sunday and Sunday night, but this could still change. What does appear to remain somewhat confident on the forecast is that precipitation will likely remain rain through most of the period. There could be a chance for some snow flurries or snow showers if a stronger system does develop late this weekend or next week, but with the ECMWF backing off of the stronger solution, snow chances look less. && .AVIATION...
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(For the 12Z TAFS through 12Z Wednesday morning) ISSUED AT 753 AM EST TUE NOV 29 2016 The last of the night`s showers were exiting to the southeast early this morning. Conditions were generally VFR, although there were some pockets of ceilings bordering on MVFR. Most of the clouds should dry up this morning, with an uneventful day in store. Mid level clouds from about 10-15K ft are expected to move in this evening, with a few showers/thunderstorms possibly developing and bringing localized sub-VFR conditions. The best shot at precipitation will be overnight, when showers and thunderstorms with largely MVFR conditions (but locally worse) are expected. Some of the storms tonight could contain strong winds. There is also a potential for low level wind shear during the coming night.
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&& .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ UPDATE...HAL SHORT TERM...HAL LONG TERM...KAS AVIATION...HAL

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