Wednesday, October 8, 2014

Wednesday, October 8, 2014 - Dog Rock Fire Smoke, Initial Report

Dog Rock Fire, initial report: 

(Current view of smoke from the Dog Rock fire, as seen from the Turtleback Dome (west) web camera in Yosemite National Park)

Fire Information:
As of this morning size of the Dog Rock fire was 245 acres, and it's burning in steep terrain, in canyon live oak and shrub fuel types.   

AQ Impacts so far:
Impacts from the Dog Rock fire have been significant but transient, raising 3 hr averages into the moderate range for El Portal (morning) and into the Unhealthy for Sensitive Groups range last night around midnight in the Yosemite Valley.  Some smoke also may fumigate the Yosemite valley 10 am to noon, probably to moderate AQI levels,  as the regular up-canyon winds manifest and bring smoke in from the fire to the west.  

Residual smoke that remains in the Yosemite Valley from this transport will add to the typical pattern, where highest concentrations occur around midnight, and likely continue to be in the USG range at their maximum if current emission persist. Faster growth will cause more severe impacts.

Outlook for next couple days: 
Expect this pattern to continue if growth continues at the same rate in the Merced River Canyon.  The BlueSky model and forecasters agree that some strong down-canyon transport typical for this time of year may also occur and create additional impacts  points down-canyon/west of Yosemite as well, and we are tracking monitors in Ponderosa Basin and Mariposa.  

More information:
Linked here are charts and graphs illustrating the above for downloading..Bluesky output appears to be matching the patterns we are seeing on the monitors, so graphics from that are also included, and can be used as a guide for anticipating the pattern, if not the magnitude of the smoke impacts in the coming days.

The best webcam (s) from which to view fire activity can be found on the Yosemite NP website: 

More to come as conditions and/or the outlook change, and if smoke impacts warrant.

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