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California, Surprise Valley California

Special Statement

Statement as of 11:39 AM PST on December 11, 2017

Expires 9:00 AM EST on December 12, 2017


... Strong inversions continue this week...

Persistent high pressure and lack of wind will keep valley
inversions in place through at least Thursday this week.

* The main impacts will be continued hazy conditions for lower
elevation valleys in western Nevada and eastern California.
Local air quality districts will issue alerts as needed if
pollution values become high enough.

* Morning temperatures will continue to be quite cold for lower
elevation valleys including urban areas such as Reno. Tuesday
and Wednesday mornings could see the coldest lows of the winter
season so far with widespread teens, or even single digits
possible in rural valleys. Mountain areas will remain
considerably warmer.

* A weak storm passing to our north Friday should be just enough
to erode the inversions, resulting in warmer temperatures and
less haze buildup Friday into the weekend.

* Inversions are where cold air is trapped in valleys allowing
smoke and pollutants to build up. They are fairly normal for
our region in winter, and can remain in place for many days or
even weeks especially with snowcover on the ground. Normally it
takes a winter storm with increased winds to rid the region of
these inversions.

-Chris

Http://weather.Gov/Reno

1139 am PST Mon Dec 11 2017

... Strong inversions continue this week...

Persistent high pressure and lack of wind will keep valley
inversions in place through at least Thursday this week.

* The main impacts will be continued hazy conditions for lower
elevation valleys in western Nevada and eastern California.
Local air quality districts will issue alerts as needed if
pollution values become high enough.

* Morning temperatures will continue to be quite cold for lower
elevation valleys including urban areas such as Reno. Tuesday
and Wednesday mornings could see the coldest lows of the winter
season so far with widespread teens, or even single digits
possible in rural valleys. Mountain areas will remain
considerably warmer.

* A weak storm passing to our north Friday should be just enough
to erode the inversions, resulting in warmer temperatures and
less haze buildup Friday into the weekend.

* Inversions are where cold air is trapped in valleys allowing
smoke and pollutants to build up. They are fairly normal for
our region in winter, and can remain in place for many days or
even weeks especially with snowcover on the ground. Normally it
takes a winter storm with increased winds to rid the region of
these inversions.


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