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424 FXUS66 KOTX 291122 AFDOTX Area Forecast Discussion National Weather Service Spokane WA 422 AM PDT TUE JUL 29 2014 .SYNOPSIS... Hot temperatures and dry weather will continue through midweek. Thunderstorms chances will increase during the latter portion of the work week as monsoonal moisture overspreads the Inland Northwest. && .DISCUSSION... Today through Thursday...The ridge of high pressure will continue to dominate the weather pattern across the region. Hot and dry conditions will prevail with today likely to be the hottest day. Triple digit temperatures will be common for valley locations. A Heat Advisory remains in effect for the lower basin and portions of the Washington Palouse and the Lewis-Clark Valley. Weak disturbances will ride along the ridge Wednesday and Thursday and if enough monsoonal moisture gets caught up in the flow we could see showers and thunderstorms pop up across the southeast zones. The NAM is the most generous developing QPF into the forecast area. Both the GFS and EC are dry Wednesday but do bring precip right up to our southern border for Thursday. For now the forecast will continue with slight chance thunderstorms from the NE Blue Mts into the Central Panhandle Mts. The increasing cloud cover streaming up from the south will help to bring daytime temperatures down a couple of degrees for Wednesday and Thursday but will act to keep overnight temperatures quite warm. This will be especially true for the mid-slopes where overnight RH recovery will be fair to poor. The one fortunate effect of this persistent ridge is that winds will continue to be light and terrain driven. /Kelch Friday and Saturday: This period has the potential to very active. The models are indicating a disturbance associated with remnants of Tropical Storm Hernan moving through the region. The ECMWF has been more consistent with bringing the disturbance through the Pacific Northwest than GFS. With that in mind, the forecast leans toward the ECMWF which brings more of the moisture with the system further West towards the Central Columbia Basin. This led to an increase in the POPs and cloud cover for the period. Afternoon convection will lead to possible thunderstorms and a few hundredths of an inch of rain to the region. The heavier rainfall will be in Eastern Washington and the Idaho Panhandle. The max temperatures were lowered a couple of degrees to allow for the increased cloud cover. Temperatures will still in the 90s for low lying locations. Sunday through Tuesday: Behind this system, a slight ridge pattern will build in the Pacific Northwest. This will lead to a drying trend in the region and decreasing chances of precip for the Inland Northwest. Temperatures will still be in the 90s for the period. /JDC && .AVIATION... 12Z TAFS: High pressure will continue to keep mostly clear skies and light winds over the aviation area for the next 24 hours with just some high clouds moving in from the south. /EK && .PRELIMINARY POINT TEMPS/POPS... Spokane 99 68 96 67 95 69 / 0 0 0 10 10 10 Coeur d`Alene 98 64 94 62 94 64 / 0 0 10 10 10 10 Pullman 97 60 94 59 93 61 / 0 10 20 10 10 10 Lewiston 105 72 101 68 100 72 / 0 10 20 20 20 20 Colville 101 60 99 59 98 60 / 0 0 0 10 10 10 Sandpoint 94 57 91 56 93 56 / 0 0 10 10 10 10 Kellogg 94 62 91 60 92 63 / 0 0 10 20 10 10 Moses Lake 104 67 101 65 99 66 / 0 0 0 0 10 10 Wenatchee 102 71 100 70 99 71 / 0 0 0 0 10 10 Omak 103 66 102 65 100 66 / 0 0 0 0 10 10 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...Heat Advisory until 8 PM PDT this evening for Lewiston Area. WA...Heat Advisory until 8 PM PDT this evening for Lower Garfield and Asotin Counties-Moses Lake Area-Upper Columbia Basin- Washington Palouse. && $$