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Area Forecast Discussion
452 FXUS64 KHUN 241118 AFDHUN Area Forecast Discussion National Weather Service Huntsville AL 618 AM CDT SUN JUL 24 2016 .UPDATE... For 12Z TAFs. && .DISCUSSION... (Issued 231 AM CDT SUN JUL 24 2016) Temps at 230 am across the cwa were in the low/mid 70s with low 70 dewpoints. Sky cover was mainly some sct ci clouds. The early mrng wx map shows a weak upper low centered over west central MS while a large upper high extends across much of the swrn US. The main upper jet is along the nrn tier of states with most sfc boundaries well north of the TN valley. As for heat indices today, noticed that HUN dewpoints mixed down into the upper 60s on Saturday which will likely do about the same this aftn. Thus will go with aftn dewpoints arnd 70 degrees and high temps in the mid 90s. This combo will produce aftn heat indices between 100 and 105 degrees with the highest heat indices over nw AL. Attm it looks like most locations across the cwa should stay below criteria for a heat advisory. Otherwise the weak upper low and daytime heating will kick off sct shra/tsra beginning by the late mrng hours and continuing into the aftn. Pcpn will begin to taper off by the evening and should be over by midnight. Monday will continue to be hot with highs in the mid 90s and heat indices between 100 and 105 degrees, with nw AL having the highest values. Again most locations should stay below heat advisory criteria since models were showing a little better aftn mixing of dewpoints. Also expect more aftn/evening sct shra/tsra. By Tuesday models show a cdfnt trying to move south but stalls out somewhere over KY. This may produce a few more clouds across the area which should keep temps a few degrees cooler along with a little better chc of shra/shra. On Wednesday GFS shows two large upper highs, one over the wrn US and the other over much of the sern US. This will put an upper wave over much of the central part of the country, including the TN valley. Thus it looks like an unsettled wx pattern is setting up by the mid to end of next week with higher chances of pcpn and cooler temps due to more expected cloud cover. 007 && .AVIATION... For 12Z TAFs: Light winds with sct050 clouds through the day outside of any thunderstorms. Did not include thunder or showers in the TAFS due to low confidence on the coverage and location of where they may develop and will handle with amendments if necessary. Winds, clouds and any precip will diminish after sunset. LN && .HUN Watches/Warnings/Advisories... AL...NONE. TN...NONE. && $$ For more information please visit our website at weather.gov/huntsville.