Area forecast discussion...updated National Weather Service Huntsville Alabama 627 am CDT Sat may 25 2013 Update... for 12z tafs && Discussion... /issued 310 am CDT Sat may 25 2013/ the latest 08z surface analysis and infrared satellite imagery indicated that a large ridge of high pressure at surface and aloft was across the lower Ohio and Tennessee Valley region. Temperatures were in the middle 40s at some locations to around 50 degrees. Some high clouds were spilling over top of the middle level ridge into the region at 08z. The back edge of the surface ridge was extending south from southeast Missouri...to central Arkansas. Expect mostly sunny conditions today with a decent warming trend...as temperatures should warm to around 80 degrees this afternoon. The models hold the upper ridge firmly in control of our weather here in the Tennessee Valley region through middle week with an increasing low level southerly flow with time. The lack of a focusing mechanism in the weak northwest flow has led ME to stick with a dry forecast into the extended time periods. The GFS hints at a weak short wave making it far enough southward by Monday evening to give at least southern middle Tennessee a slight chance of showers. Have left this scenario in the going forecast. A dry forecast is further expected through the end of the upcoming week...with the upper ridge holding firm across the region. The GFS and European model (ecmwf) models attempt to move an upper level low through the central Rocky Mountain states by Thursday and into the northern plains by Friday. A surface cold front will attempt to drop southeast through the Central Plains into the lower Ohio Valley by Saturday... with increasing clouds noted. Will not introduce precipitation chances at this time on Saturday...as the European model (ecmwf) model weakens this storm system quite a bit...compared to the GFS model. Have followed a general compromise between the GFS and European model (ecmwf) models involving forecast temperatures through the extended forecast time periods. Tt && Aviation... for 12z tafs...VFR conditions will persist through the period. Winds shift through the afternoon to become generally out of the southeast...remaining near or below 5kts. Ccc && Hun watches/warnings/advisories... Alabama...none. Tennessee...none. && $$ For more information please visit our website at weather.Gov/Huntsville.