Southern Idaho Weather Forecast
CHIEF METEOROLOGIST ERIC BRILL – EVENING UPDATE Thursday, September 16th, 2021
A red flag warning has been issued for all of Southern Idaho. Parts of the region are expected to have the warning expire on Thursday evening, but I have a feeling that a new red flag warning will be put into place until Saturday evening (which is the case for Gooding, Cassia and Twin Falls counties). While that does sound rather confusing as to who is within what, the big thing to really get out of this is that dry weather conditions and strong winds will allow any fire that is started to spread rather quickly through the weekend. Try to avoid starting any fires if you are able to, as you don’t want to be the person known to start a grassfire or wildfire!
Thursday was breezy and cooler around Southern Idaho, but warmer and not as breezy of weather conditions are expected for Friday, until some bigger changes arrive.
There really aren’t many (if any!) issues pertaining to the weather on Friday! Sunny skies, slightly above average temperatures and 5-15 mph winds are within the forecast. A little bit more smoke may return throughout the day, but it should not be bad at all.
For Saturday, expect stronger winds to return to Southern Idaho, as sustained winds will likely be in the 15-30 mph range. Temperatures will be a little bit warmer for Saturday compared to that of Friday, so there won’t be a drastic cool-down with the weather on Saturday. The winds truly are the biggest issue for the day, as partly cloudy skies are expected.
A cold front is going to move through Southern Idaho on Sunday, which will result in quite a temperature drop when it moves through. There is still a little bit of disagreement as to what part of the day the cold front will move through Southern Idaho, but it now appears to be a late morning/early afternoon general time frame. Stronger winds will continue to be apart of the weather as well, as sustained winds will still likely be in the 15-30 mph range. There will be some showers to go along with this cold front as well, but as that cold front moves further to the southeast, it will lose some of the moisture within it. Nonetheless, the showers should help out the drought situation a little bit and the possibility is there that some snow will fall in the higher elevation locations. The lowest that rain/snow line looks to drop to is around 7,000 feet overnight Sunday into Monday. This means parts of the South Hills, Albion Mountains and mountains around the Wood River Valley could see some accumulating snow during this time frame. Of course, it isn’t like it will stick around forever, but the possibility is there for those areas to get snow. Be aware of this if you plan on driving through Galena Summit late Sunday into early Monday.
Temperatures will likely stay below 60° for many southern Idaho towns and cities on Monday. As you can imagine, overnight lows will be seasonably chilly as well, with Tuesday morning having the coldest temperatures. I anticipate a lot of Southern Idaho to fall into the 30s for those overnight lows on Tuesday morning. Within parts of the Mini-Cassia Region and Wood River Valley as well as the Northern Magic Valley, overnight lows very well could fall into the 31-35° range. Monday morning and Wednesday morning will also be chilly starts to the day, but those given mornings should be 2-3° ‘warmer’ than Tuesday morning.
An area of high pressure looks to build in during the middle of next week and that should calm the weather down and warm it back up a bit. There may be another cold front by the Friday time frame, so continue to keep an eye on that as well.
You warm weather fans better enjoy Friday and Saturday (although the winds on Saturday aren’t ideal)! We are in for quite a roller coaster over the next 10 days!
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THURSDAY NIGHT (September 16, 2021)
MAGIC VALLEY: Clear skies. Low: 44. Winds: Southwest to South 5-10 mph. WOOD RIVER VALLEY: Clear skies. Low: 39. Winds: Northeast 5-10 mph.
FRIDAY (September 17th)
MAGIC VALLEY: Sunny skies and warmer. High: 83. Winds: Northeast 5-15 mph. WOOD RIVER VALLEY: Sunny skies. High: 75. Winds: Southeast to Southwest 5-10 mph.
MAGIC VALLEY: Partly cloudy skies. Low: 58. Winds: South 5-20 mph. WOOD RIVER VALLEY: Partly cloudy skies. Low: 45. Winds: North 5-10 mph.
SATURDAY (September 18th)
MAGIC VALLEY: Partly cloudy skies. It will be windy as well. High: 85. Low: 49. WOOD RIVER VALLEY: Partly cloudy skies. It will be windy as well. High: 77. Low: 44.
SUNDAY (September 19th)
MAGIC VALLEY: Partly sunny skies with a chance of showers and/or thunderstorms. It will be windy as well. High: 71. Low: 40. WOOD RIVER VALLEY: Mostly cloudy skies with a chance of showers and/or thunderstorms. It will be breezy as well. High: 63. Low: 35.
MONDAY (September 20th)
MAGIC VALLEY: Partly sunny skies with a slight chance of an AM shower or thunderstorm. It will be breezy as well. High: 59. Low: 38. WOOD RIVER VALLEY: Partly sunny skies with a slight chance of an AM shower or thunderstorm. High: 54. Low: 33.
TUESDAY (September 21st)
MAGIC VALLEY: Sunny skies. High: 65. Low: 41. WOOD RIVER VALLEY: Sunny skies. High: 60. Low: 37.
WEDNESDAY (September 22nd)
MAGIC VALLEY: Partly cloudy skies. High: 78. Low: 49. WOOD RIVER VALLEY: Partly cloudy skies. High: 68. Low: 42.