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Southern Idaho Weather Forecast

Published: Sep. 17, 2020 at 8:05 AM MDT|Updated: Sep. 17, 2020 at 4:58 PM MDT
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CHIEF METEOROLOGIST ERIC BRILL – EVENING UPDATE

Thursday, September 17, 2020

There is an air quality alert and a red flag warning in place for the majority of Southern Idaho through the PM hours of Friday. The air quality alert that is in place is due to less smoke from fires that continue to burn all around California, Washington, Idaho and Oregon. The smokes from these fires have entered Southern Idaho due to southwesterly winds at higher levels of the sky, and the end result is poor air quality. With a little bit of a breeze expected for the next couple of days, more fires could ignite, and the favorable weather conditions will allow them to spread rather easily. It is tough to determine how long the air quality is going to be less than stellar around Southern Idaho, but the possibility of a cold front on Friday could give us a little bit of help for the upcoming weekend!

Temperatures won’t be quite as warm as what we’ve seen over the past few days, and that means some changes are coming to the weather in Southern Idaho.

Afternoon high temperatures are going to be 5-10° cooler from Thursday to Friday, as an incoming area of low pressure with a cold front attached to it arrives in Southern Idaho. This cold front is also going to increase cloud coverage overnight Thursday into Friday, resulting in mostly cloudy skies for the last day of the work week. Some showers and thunderstorms will also pop-up on Friday evening, but I anticipate them to generall happen after about 6 PM. No severe weather is expected, but if lightning starts to strike in areas that do not see rain, the possibility is there that some wildfires could start.

The overall better chance of rain is going to happen overnight Friday into Saturday as the cold front will actually move through then. Some of these showers are going to hang around Southern Idaho through the day on Saturday, in which the higher elevation terrain has a better chance of rain than that of the lower elevations. Breezy weather is also going to accompany this front, and those winds will be picking up through the day on Friday, hang around through Saturday, and start to diminish overnight Saturday into Sunday.

Sunday will very likely have the nicer weather of the two weekend days, as developing sunshine and drier weather is likely to develop. Temperatures are also going to be about 5° warmer for Sunday compared to that of Saturday. The smoke that is in the higher levels of the sky should also clear out a bit for Sunday and early next week, but that doesn’t mean the smoke is going to be completely gone. With the Badger Fire in Cassia County having burned over 35,000 acres, chances are that there is still going to be a fire around, despite the rain from the cold front. This will result in more smoke being within the air of Southern Idaho, but how much is still a question. The more rain that falls with the smallest amount of potential lightning will help extinguish that fire a bit, but breezy weather conditions will also give that fire the ability to expand prior to the arrival of the rain. It really is a cat-and-mouse game when it comes to this fire, and there are a lot of questions that really can’t be answered about that fire until this weekend comes-and-goes.

Early next week will have some very pleasant weather conditions in more ways than one. Temperatures are going to be in the 70s more often than not, but some lower 80s will try to make an appearance on Wednesday and Thursday in the Wood River Valley. There is also going to be a fair amount of sunshine around as well, but a slight chance of a shower is possible for Tuesday.

This incoming cold front is going to be big for Southern Idaho. Hopefully the rain from it will be falling all across the region, as we are in quite a drought right now. Of course, with the various fires burning around the Western United States, the rain should help firefighters over the coming days (I just wish there was a little less of a breeze around). Keep your fingers crossed that Mother Nature works in our favor over the next few days!!

'<a href="http://www.kmvt.com/weather/alerts/" target="_blank"><b> For the latest on all warnings and advisories in Southern Idaho click here… </b></a>

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THURSDAY NIGHT (September 17, 2020)

MAGIC VALLEY: Smoky/hazy skies. Aside from that, partly cloudy skies. Low: 58. Winds: Northeast 3-8 mph.

WOOD RIVER VALLEY: Smoky/hazy skies. Aside from that, partly to mostly cloudy skies. Low: 52. Winds: South 5-15 mph.

FRIDAY (September 18th)

MAGIC VALLEY: Smoky skies from fires in California, Oregon, Idaho and Washington. Otherwise, mostly cloudy skies with some isolated rain showers and thunderstorms, generally after 6 PM. Not as warm and breezy. High: 79. Winds: Southwest 10-25 mph.

WOOD RIVER VALLEY: Smoky skies from fires in California, Idaho, Oregon and Washington. Otherwise, mostly cloudy skies with some isolated rain showers and thunderstorms, generally after about 7 PM. Not as warm and a little bit breezy. High: 75. Winds: Northeast to South 5-20 mph.

FRIDAY NIGHT:

MAGIC VALLEY: Smoky skies from fires in California, Oregon, Idaho and Washington. Aside from that, mostly cloudy skies with some scattered rain showers and isolated thunderstorms. A little bit breezy and a little bit cooler. Low: 52. Winds: West to South 5-20 mph.

WOOD RIVER VALLEY: Smoky skies from fires in Idaho, California, Oregon and Washington. Aside from that, mostly cloudy skies with scattered rain showers and isolated thunderstorms. A little bit breezy and cooler. Low: 45. Winds: West to South 5-20 mph.

SATURDAY (September 19th)

MAGIC VALLEY: Partly sunny skies with a chance of rain showers and thunderstorms. Cooler and breezy. High: 66. Low: 46. WOOD RIVER VALLEY: Partly sunny skies with scattered rain showers and isolated thunderstorms. Cooler temperatures and breezy. High: 62. Low: 38.

SUNDAY (September 20th)

MAGIC VALLEY: Mostly sunny skies and pleasant. High: 72. Low: 46. WOOD RIVER VALLEY: Mostly sunny skies and pleasant. High: 66. Low: 40. MONDAY (September 21st)

MAGIC VALLEY: Developing clouds late in the day, but generally mostly sunny skies and pleasant. High: 79. Low: 51. WOOD RIVER VALLEY: Increasing clouds late in the day, but mostly sunny skies and pleasant. High: 72. Low: 44.

TUESDAY (September 22nd)

MAGIC VALLEY: Mostly sunny to partly cloudy skies with a slight chance of a rain shower and/or a thunderstorm. High: 78. Low: 50. WOOD RIVER VALLEY: Mostly sunny to partly cloudy skies with a slight chance of a rain shower and/or a thunderstorm. High: 74. Low: 44.

WEDNESDAY (September 23rd)

MAGIC VALLEY: Mainly sunny skies and pleasant. High: 80. Low: 51. WOOD RIVER VALLEY: Partly cloudy skies and pleasant. High: 75. Low: 45.

THURSDAY (September 24th)

MAGIC VALLEY: Sunny skies and pleasant. High: 83. WOOD RIVER VALLEY: Sunny skies and pleasant. High: 77.

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