379
FNUS73 KUNR 221603
FWSUNR

Spot Forecast for Porcupine Rx...SD-PRA
National Weather Service Rapid City SD
1003 AM MDT Wed May 22 2024

Forecast is based on ignition time of 1200 MDT on May 22.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...Today and tonight will be dry. Breezy southwest winds
today will become more southerly this evening, decreasing to around
10 mph from 5-11 PM or so, then increasing again to 10 to 20 mph
with gusts around 25 mph. Winds will become more southwesterly again
on Thursday morning. A cold front will move through in the afternoon,
and winds will become westerly and stronger, around 20 to 25 mph with
gusts up to 35 mph. Additionally, chances for showers return Thursday
afternoon.

.REST OF TODAY...

Sky/weather.........Mostly sunny (20-30 percent).
Max temperature.....Around 69.
Min humidity........27 percent.
Wind (20 ft)........Southwest winds 10 to 15 mph with gusts to
                    around 18 mph.
CWR.................0 percent.
LAL.................1.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.
Mixing height.......8200 to 8700 ft agl.
Transport winds.....Southwest around 25 mph.
Smoke dispersal.....Excellent.

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent).
Min temperature.....Around 49.
Max humidity........66 percent.
Wind (20 ft)........South winds 10 to 20 mph with gusts to around
                    25 mph.
CWR.................0 percent.
LAL.................1.
Haines Index........6 or high potential for large plume dominated
                    fire growth.
Mixing height.......500 to 1000 ft agl.
Transport winds.....South around 25 mph increasing to around 35 mph
                    overnight.
Smoke dispersal.....Poor.

.THURSDAY...

Sky/weather.........Mostly sunny (40-50 percent). Chance of rain
                    showers in the afternoon.
Max temperature.....Around 72.
Min humidity........27 percent.
Wind (20 ft)........Southwest winds 15 to 20 mph shifting to the
                    west 20 to 25 mph in the afternoon. Gusts up to
                    35 mph.
CWR.................25 percent.
LAL.................1.
Mixing height.......8300 to 8800 ft agl.
Transport winds.....Southwest 35 to 45 mph.
Smoke dispersal.....Excellent.

$$
Forecaster...KP
Requested by...FUELS SPC
Type of request...PRESCRIBED
.TAG 2414907.0/UNR
.DELDT 05/22/24
.FormatterVersion 2.0.0
.EMAIL leland.black@bia.gov