Friday, November 26, 2010

Nov. 25 - I missed the past couple of days due to being on the road and finally have internet access. I'm in Southern Nevada where it's been very brisk on Thanksgiving. The low here in Henderson was a chilly 28 and ranged from 21 to 34 in the Las Vegas Valley. Still a freeze warning in for the LV Valley for Black Friday. Similar story for southern NM where there are "hard" freeze warnings going out from the NWS office. Forecast low for Las Cruces is 23 for Friday with light northernly winds. With that kind of temperatures I would not be surprised to see some decent temperature inversions causing high particulate matter concentrations in the morning hours as the boundary layer falls to very shallow depths as long as the winds are light. Nothing interesting in the MODIS AOD product on Thursday as levels looked to be less than 0.2 which is low.

The Sunland Park City Yard NMED monitoring site recorded some high PM2.5 Thursday. At 2 pm peak PM2.5 ranged around 60 ug/m3 but PM10 was about 22 ug/m3. Maybe a instrument or calibration issue for that since we require that the PM2.5 mass be less than PM10 mass.

The EPA Air Quality Index (AQI) for the area shows some :moderate levels in southern NM.
The forecast shows a system coming in Sunday that might cause high winds and blowing dust. Will have to get an update on this on Friday.


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