Updated
10am MDT Wednesday, August 3, 2016
Valid
through Noon MDT Thursday, August 4, 2016
Smoke
Outlook
Air
quality is forecast to remain in the Good to Moderate air quality category across
the state today. Impacts are less
substantial today with Pocatello, Franklin, Idaho Falls, and Salmon the only
locations in south Idaho with currently- elevated monitors reading in the
Moderate Category. In north Idaho, monitor readings are currently in the
Moderate category in the Moscow area. Expect
higher readings in the evening and early morning before improving during the
day.
An
upper level low pressure system will track east into Montana along the Canadian
border this afternoon and will still provide for a chance of showers across the
extreme northern Panhandle. Expect winds
from the west-northwest with southwest winds within the Purcell trench and the
Upper Snake River Plain. Surface wind
speeds will range from 5-10 mph across north Idaho and 10-20 mph across south
Idaho. Mixing heights will range from
2,000-6,000 feet AGL in the afternoon with transport winds from the northwest-west
at 10-15 mph. Again, the Purcell Trench
and Upper Snake River Plain will see southwest transport winds at 10-15 mph and
10-20 mph, respectively. On Thursday, a
ridge of high pressure will briefly establish over northern Idaho. Wind speeds will be light, in the 2-8 mph
range, with variable direction across the state. Wind directions at higher speeds will be
primarily from the east across southern Idaho and northwest-west across
northern Idaho. Mixing heights will
range from 2,000-10,000 feet AGL in the afternoon tomorrow.
Smoke impacts today are expected to be minimal today with
the cooler temperatures and lighter wind speeds. Brief periods of heavy, localized smoke
should be expected in the morning before the inversion lifts around 11am-12noon
today. The regions that may see smoke
this evening will extend through the Snake River Plain into the Island Park
area before turning down-valley Thursday afternoon. High-altitude smoke is expected to track west
into the Treasure Valley tomorrow afternoon.
Due to lighter wind speeds, transport
of smoke is expected to be limited to areas near fires.
DEQ
Air Quality Advisories:
·
The Twin Falls Regional Office
has issued a Stage 1 Forecast and Caution for Blaine County. Valid through
1pm August 3rd.
·
The Idaho Falls Regional Office
has issued a Stage 1 Forecast and Caution for Butte, Custer and Lemhi Counties. Valid through 9 am August 3rd.
·
The Lewiston Regional Office
has issued a Stage 1 Forecast and Caution for Clearwater, Idaho, Latah, Lewis, and Nez Perce Counties (off the Nez
Perce Reservation). Valid through 10
am August 3rd.
The USFS installed monitors near Stanley, Idaho and Lowman, Idaho. The information can be found at http://www.wrcc.dri.edu/cgi-bin/smoke.pl
• Stanley, ID monitor is Smoke #217
• Lowman, ID monitor is Smoke #66
• Users should be aware that the Forest Service site reports the data in Coordinated Universal Time (UTC). To convert from UTC to Mountain Daylight Time, subtract 6 hours.
Smoke forecasts are dependent on predicted fire growth and weather. If conditions change unexpectedly, impacts could occur. When visibility starts to go below 5 miles, sensitive groups should minimize outdoor activities. Everyone else should minimize prolonged or physical activity outdoors. Visit the Idaho Smoke Blog for more information at http://idsmoke.blogspot.com/
Your eyes are your best tools to determine if it’s safe to be outside. Even if you smell smoke, the air quality may still be good.
AQI Category
|
Visibility (miles)
|
Good
|
11+
|
Moderate
|
6-10
|
Unhealthy for Sensitive Groups
|
3-5
|
Unhealthy
|
1½ -2¾
|
Very Unhealthy
|
1-1¼
|
Hazardous
|
Less than 1
|
How to estimate air quality based on visibility for areas without an air quality monitor or airport visibility estimate:
a. Face away from the sun.
b. Determine the limit of your visible range by looking for targets at known distances (miles).
c. Visible range is when an object you can easily see in the distance disappears.
d. Use the visibility values above to determine the local wildfire smoke category.
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