Southern Idaho Weather Forecast
CHIEF METEOROLOGIST ERIC BRILL – EVENING UPDATE
Tuesday, September 22, 2020
No significant changes have developed in the forecast over the past 24 hours, but the weather is going to be changing as a whole over the next few days.
For Wednesday and Thursday, those days won’t be all that much different compared to that of Tuesday. A mix of sun and clouds is expected, but I anticipate there being a little less haziness/smokiness within the skies of Southern Idaho. That is due to a very weak cold front that swung through the area on Tuesday. This cold front hasn’t/won’t do much to our temperatures, but it should ‘clean the air’ up in the higher levels of Southern Idaho for the next few days. I will say that it is going to become breezy on Thursday, but that almost has to do with a Friday cold front more than anything else.
This cold front, which looks to arrive overnight Thursday into Friday, is going to enhance the winds in the region, and drop temperatures for Friday and Saturday. Sustained winds for Thursday and Friday will likely be in the 10-25 mph range for both given days, and I expect Thursday to be the breezier day (especially during the afternoon and evening hours). One unfortunate thing about this cold front is that it looks to be a pretty dry one, which isn’t good news for the Western United States. A lot of Southern Idaho is going to be hard pressed to see any sort of rain out of this, which is only going to amplify our drought situation. The Thursday-Saturday time frame is about the only shot we have of seeing ANY sort of rain through potentially through the middle of October.
Yes, our drought situation is going to get worse before it gets better.
Temperatures are going to be a few degrees below average for the beginning of the weekend, but rebound nicely for Sunday, Monday and Tuesday. As a whole, besides a little bit of a breeze, some awesome weather is expected for the last weekend of September. Mostly sunny to sunny skies are expected.
One of, if not the, biggest reasons we are going to see dry weather for early next week onward is due to an area of high pressure that is going to develop. This high pressure isn’t going to move very much at all, and will keep temperatures above average. While no record breaking numbers are expected, it wouldn’t be a surprise if temps are 10-15° above average all next week. That means middle to lower 80s for the Magic Valley and Mini-Cassia Region, while the Wood River Valley is going to see middle to upper 70s.
I wish I had some better news in regards to higher chances of precipitation, but reality is that the outlook is pretty bleak. Keep your fingers crossed that Thursday through Saturday is wetter than I anticipate, but I wouldn’t bank on that happening.
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TUESDAY NIGHT (September 22, 2020)
MAGIC VALLEY: Smoky/hazy skies. Aside from that, partly cloudy skies. Low: 52. Winds: South 5-15 mph.
WOOD RIVER VALLEY: Smoky/hazy skies. Aside from that, partly to mostly cloudy skies. Low: 44. Winds: North 5-10 mph.
WEDNESDAY (September 23rd)
MAGIC VALLEY: Smoky skies from fires in California, Oregon, Idaho and Washington. Otherwise, partly cloudy to partly sunny skies. High: 82. Winds: Southwest to Northwest 5-10 mph.
WOOD RIVER VALLEY: Smoky skies from fires in California, Idaho, Oregon and Washington. Otherwise, partly cloudy to partly sunny skies. High: 73. Winds: Southwest 5-10 mph.
MAGIC VALLEY: Smoky skies from fires in California, Oregon, Idaho and Washington. Aside from that, mostly clear skies. Low: 53. Winds: South to Southwest 5-10 mph.
WOOD RIVER VALLEY: Smoky skies from fires in Idaho, California, Oregon and Washington. Aside from that, mostly clear skies. Low: 44. Winds: Northeast to West 5-10 mph.
THURSDAY (September 24th)
MAGIC VALLEY: Partly cloudy skies with some haze/smoke around as well and breezy. High: 78. Low: 50. WOOD RIVER VALLEY: Partly cloudy skies with some haze/smoke around as well. Breezy weather is expected as well. High: 70. Low: 41. FRIDAY (September 25th)
MAGIC VALLEY: Partly cloudy skies, breezy and cooler. High: 68. Low: 44. WOOD RIVER VALLEY: Partly sunny skies with a slight chance of an afternoon/evening rain shower and/or a thunderstorm. Breezy and cooler. High: 62. Low: 37.
SATURDAY (September 26th)
MAGIC VALLEY: Mainly sunny skies and a little bit breezy. High: 70. Low: 50. WOOD RIVER VALLEY: Mostly sunny skies with a slight chance of a rain shower and/or a thunderstorm. High: 65. Low: 39.
SUNDAY (September 27th)
MAGIC VALLEY: Sunny skies. It will be a little bit breezy and warmer as well. High: 76. Low: 52. WOOD RIVER VALLEY: Mainly sunny skies and a little bit breezy. High: 72. Low: 43.
MONDAY (September 28th)
MAGIC VALLEY: Mostly sunny to partly cloudy skies and a little bit breezy. High: 79. Low: 53. WOOD RIVER VALLEY: Mostly sunny to partly cloudy skies and seasonably warm. High: 77. Low: 46.
TUESDAY (September 29th)
MAGIC VALLEY: Sunny skies and seasonably warm. High: 80. WOOD RIVER VALLEY: Sunny skies and seasonably warm. High: 75.
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