Persistent cold-air pool forecast valid Saturday 02/16/2019 8:00 pm MST

Summary:  Cool temperatures and scattered snow showers will impact Utah through the weekend. A broad  trough will keep unseasonably cool temperatures and well-mixed conditions through next week. A stronger storm is possible later next week.

No persistent cold-air pools are forecast for the next 7 days at this point, and with the climatological end of "inversion season" in mid-February, it is looking almost certain that the winter pollution season is over.

Persistent cold-air pool forecast valid Monday 02/11/2019 1:00 pm MST 

 

Summary:  Another storm system will approach Utah Wednesday afternoon through Thursday, increasing southerly winds and keeping the air clean. The storm looks to be primarily a rain/snow mix in the Valley locations.

Yet another cold front and snowstorm is possible Saturday, with cold and unsettled conditions with light snow lingering into early next week.   

No persistent cold-air pools are forecast for the next 7 days at this point, and with the climatological end of "inversion season" in mid-February, it is looking increasingly likely that the winter pollution season is over.

Daily forecast info will be provided once a persistent cold air pool period has been identified in weather guidance models.

Persistent cold-air pool forecast

Persistent cold-air pool forecast valid Friday 02/08/2019 7:00 pm MST 

 

Summary:  A storm system will approach Utah Sunday afternoon, increasing southerly winds and keeping the deep snowcover and cold temperatures from generating much pollution build-up.

Another snowstorm is possible Sunday night into Monday morning. Unsettled conditions with another cold storm possible Wed-Thursday next week.   

No persistent cold-air pools are forecast for the next 7 days at this point.

Daily forecast info will be provided once a persistent cold air pool period has been identified in weather guidance models.

Persistent cold-air pool forecast valid Wednesday 02/06/2019 6:00 pm MST 

Summary:  A major storm system generally brought between 9 and 14 inches of snow to Utah Valleys Wednesday with more lake effect possible into Thursday morning. See https://www.cocorahs.org/ for a map of snowfall totals.

A large trough over the western US will keep air quality good through next weekend with breezy conditions and moderating temperatures.  Snow possible Monday. Yet additional storms may affect the region going into the middle of Feb.

Daily forecast info will be provided once a persistent cold air pool period has been identified in weather guidance models.

Persistent cold-air pool forecast

Persistent cold-air pool forecast valid Saturday 02/02/2019 1:00 pm MST 

Summary:  A complex series of storms will traverse the western US through the next week.  Rain will predominantly fall in the Valleys this weekend, melting the remaining snow. A chance of snow if forecast with colder systems by the middle of next week No persistent cold-air pools are forecast for the next week at least.

Sunday 3 February:

Rain.

High 48 F Low 41 F

  

Monday 4 February:

Rain.
High 49 F Low 42 F

Tuesday 5 February:
Rain with possible snow mix.

High 43 F Low 29 F

  

Wednesday 6 February:

Chance of snow.
High 36 F Low 25 F

Thursday 7 February:
Partly cloudy.
High 32 F Low 24 F

Friday 8 February:
Partly cloudy.
High 35 F Low 23 F

Persistent cold-air pool forecast

Persistent cold-air pool forecast valid Wednesday 01/30/2019 5:00 pm MST 

Summary:  A weak persistent cold-air pool (high pressure and associated capping inversion is not that pronounced, meaning the pollution builds into a deeper layer, and also surface snow cover is partially gone) will continue through Friday, with PM2.5 concentrations increasing ~5 microgram/m3 each day. A series of weather systems will clean the air starting Saturday and bring Valley Rain this weekend, followed by Valley snow early next week.

Thursday 31 January:

Partly cloudy, increasing haze within cold-air pool.

High 37 F Low 27 F

 

Friday 1 February:

Partly cloudy, increasing haze within cold-air pool.

High 42 F Low 25 F

NAM Forecast Model showing temperature inversion in place on Friday morning showing a surface inversion and inversion aloft.

Saturday  2 February:

A chance of showers in the afternoon.  

High 45 F Low 32 F.

  
Sunday 3 February: 

   

Rain showers likely, changing to snow showers Sunday night.

High  40 F Low 30 F.

Monday 4 February
 
A chance of snow.

High  39 F Low 23 F.

Tuesday 5 February
 
A chance of snow.

High  32 F Low 21 F.

Persistent cold-air pool forecast

Sunday, January 27, 2019 5 pm

Weather Synopsis:

Persistent cold-air pool forecast valid Sunday 01/27/2019 4:00 pm MST 

This will be updated every 2-3 days except before and during major PCAPS (will be updated daily).

Summary:  Weather models have backed away from any major PCAPS for the next 10 days. A weak cold-air pool this weekend will end Monday with a dry cold system coming from the north. Another weak 3.5 day duration cold-air pool will extend from Tuesday evening - Friday. 

Pollution levels may slowly increase to 15+ micrograms/m3 by Friday, but this is not expected to be a very significant inversion episode. 

A series of storm systems are now forecast to bring rain and snow to Utah from next Saturday - Tuesday (February 2 nd-5 th).

Monday 28 January:

Mostly cloudy,

High 38 F Low 25 F

 

Tuesday  29 January:

Mostly sunny.
High 35 F Low 24 F

Wednesday  30 January:

 

Sunny. 

High 36 F Low 23 F.
  
GFS Forecast Model showing weak inversion in place on Wednesday morning.

Thursday 31 January: 
 
Mostly sunny.

High 39 F Low 27 F.

GFS Forecast Model showing weak inversion continuing Thursday morning.

Friday 1 February:    

Mostly sunny.

High  41 F Low 25 F.

Saturday 2 February
 
A chance of rain and snow.

High  40 F Low 32 F.