The warming trend begins today with temperatures on track to warm to around 100° in the Treasure Valley. There is patchy smoke around this afternoon courtesy of the Goldrun Fire burning around 25 miles north of Emmett.
Isolated thunderstorms have developed around the Nevada border, but with dry air in place the storms likely don't reach the Magic Valley. However, there could be locally gusty winds associated with outflow from the storms.
The high pressure centered over the Desert Southwest is expanding north along with the hot temperatures. The heat peaks on Friday and Saturday with high temperatures ranging from 103-107° in the Treasure Valley, 99-103° in the Magic Valley, around 90° in mountain valleys, and mid to upper 80s in the mountains.
A weak trough will keep a slight risk for showers and thunderstorms in the forecast on Wednesday and Thursday. The storms will be very isolated and mainly confined to higher elevations near the Nevada border and in the Central Mountains. As the high pressure ridge shifts further east, the Treasure Valley will be placed under southwest flow bringing some monsoonal moisture into play. This will increase the chance for showers and thunderstorms in the same areas on Saturday and Sunday.
The high pressure ridge and accompanied monsoon moisture shifts further east next week. Triple digit heat continues through Monday, before cooling off into the 90s next week. Shower and thunderstorm chances diminish.
