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Area Forecast Discussion
401 FXUS64 KHUN 241738 AAC AFDHUN Area Forecast Discussion...UPDATED National Weather Service Huntsville AL 1238 PM CDT FRI JUN 24 2016 .UPDATE... For 18Z TAFs. && .DISCUSSION... (Issued 1054 AM CDT FRI JUN 24 2016) On radar, a few showers still linger along the TN River, slowly dissipating as they move southeast. Visible satellite shows the cloud cover associated with these showers extends back into southern TN and is having an effect on the temp trend this morning. For example, it`s 79 degrees in Scottsboro while sunshine has warmed Fort Payne up to 86 degrees already. The combination of the differential heating boundary along with leftover mesoscale boundaries and an approaching upper-level disturbance will allow for additional development this afternoon. Therefore, expanded slight chance and chance POPs into NE AL through this afternoon. Adjusted dewpoints up slightly to accommodate current trends but will monitor as boundary slowly sags south. Big story for this afternoon (and this weekend) is the heat index. This afternoon, heat index values will range from the mid 90s in NE AL up to 105 in far NW AL. These will hinge on the daytime temps reaching full potential of climbing into the low-mid 90s. JMS && .AVIATION... For 18Z TAFs: A slow-moving frontal boundary lies to our north early this afternoon and in concert with a weak upper short wave will help to instigate shower/storm development later this afternoon. Northern areas are favored for development due to the closer proximity to these features as they drift southward into our area. Scattered shower activity is expected, although there still remains some uncertainty regarding eventual shower coverage. Instability is sufficient to produce strong updrafts and some thunderstorm activity as well, but due to lack of confidence in exact locations of development, will not mention TSRA in TAFs at this time. Will amend as necessary if a TSRA and lower cig/vis affect a TAF site. KDW && .HUN Watches/Warnings/Advisories... AL...Heat Advisory from 10 AM Saturday to 4 AM CDT Monday for ALZ001>010- 016. TN...Heat Advisory from 10 AM Saturday to 4 AM CDT Monday for TNZ076-096- 097. && $$ For more information please visit our website at weather.gov/huntsville.