Suppression Forecast
Issued by NWS Rapid City, SD

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000
FNUS73 KUNR 012315
FWSUNR

Spot Forecast for Lyman...Great Plains Dispatch
National Weather Service Rapid City SD
515 PM MDT Sun Aug 1 2021

Forecast is based on forecast start time of 1800 MDT on August 01.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Winds will be terrain driven because of the weak
synoptic pattern. An upper-level ridge to the west will dominate
the weather through the upcoming week. Very warm conditions can be
expected. Somewhat elevated fire weather conditions are possible
at times this week as relative humidities drop into the teens on
some days, especially over northeastern Wyoming into far western
South Dakota. At this point, winds look to be relatively light
most days. Dry weather will continue early this week, with
isolated showers and thunderstorms possible late Tuesday through
midweek. Wetting rain chances will remain low.

.TONIGHT...

Sky/weather.........Clouds dissipating this evening. Patchy smoke.
Min temperature.....Around 60.
Max humidity........51 percent.
Wind (20 ft)........Variable at 3-5 mph, becoming downslope this
                    evening, and then downvalley by midnight.
CWR.................0 percent.
LAL.................1.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.
Mixing height.......400 to 900 ft agl.
Transport winds.....Southeast 10 to 15 mph.
Smoke dispersal.....Poor.

.MONDAY...

Sky/weather.........Mostly sunny early, but with broken cumulus
                    clouds developing by midday. Patchy smoke.
Max temperature.....Around 88.
Min humidity........19 percent.
Wind (20 ft)........Downvalley early 3-6 mph, becoming upslope
                    3-6 mph by late morning, then upvalley by
                    early afternoon. Variable 3-6 mph overall.
CWR.................0 percent.
LAL.................1.
Haines Index........4 or low potential for large plume dominated
                    fire growth.
Mixing height.......8800 to 9300 ft agl.
Transport winds.....West 5 to 10 mph.
Smoke dispersal.....Fair.

.MONDAY NIGHT...

Sky/weather.........Mostly clear.
Min temperature.....Around 64.
Max humidity........46 percent.
Wind (20 ft)........Variable 3-6 mph, becoming downslope and then
                    downvalley.
CWR.................0 percent.
LAL.................1.
Haines Index........4 or low potential for large plume dominated
                    fire growth.
Mixing height.......400 to 900 ft agl.
Transport winds.....East around 15 mph.
Smoke dispersal.....Poor.

.TUESDAY...

Sky/weather.........Mostly sunny.
Max temperature.....Around 89.
Min humidity........21 percent.
Wind (20 ft)........Downvalley early 3-6 mph, becoming upslope
                    3-6 mph by late morning, then upvalley by
                    early afternoon. Variable 3-6 mph overall.
CWR.................0 percent.
LAL.................1.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.
Mixing height.......10000 to 10500 ft agl.
Transport winds.....North around 10 mph shifting to the west in the
                    afternoon.
Smoke dispersal.....Good.

$$
Forecaster...MB
Requested by...Cassandra Garcia
Type of request...WILDFIRE
.TAG 2116781.0/UNR
.DELDT 08/01/21
.FormatterVersion 1.0.26
.EMAIL sdgpc@firenet.gov


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