Tuesday, September 8, 2020, at approximately 8:30 AM, firefighters responded to a wildfire in the Mount Thielsen Wilderness. The fire began in the tree line near the Pacific Crest Trail within the Diamond Lake Ranger District. The east wind event caused the fire to run northwest and jump Highway 138 E.
The command of the fire transitioned to the Southern Area Gray Team on September 12th, then to the Southern Area Gold Team on September 15th, and the Southern Area Red Team assumed command on September 27th. The Southern Area Red Team is managing the Thielsen Fire along with the Archie Creek Fire.
Most of the fire activity on the Thielsen Fire has decrease significantly due to several days of rain. As temperatures warm, the fire may continue to produce smoke from stumps and logs that are still burning. Over the next several days, crews will be pulling hoses and other supplies off the line, and they will be conduction suppression repairs.
|Current as of|
|Date of Origin||Tuesday September 08th, 2020 approx. 08:30 AM|
|Location||5 miles north of Crater Lake National Park and within 1 mile of Diamond Lake Resort|
|Incident Commander||Mike Dueitt - ICT1 Steve Parrish - Deputy ICT1 Charlie Patterson - ICT1(t)|
|Incident Description||Thielsen Wilderness Fire|
|Coordinates||43.16 latitude, -122.07 longitude|
|Percent of Perimeter Contained||69%|
|Estimated Containment Date||Saturday October 10th, 2020 approx. 12:00 AM|
Timber (Litter and Understory) Timber (Grass and Understory) Brush (2 feet)
Continued drying further support the consumption of deep duff and heavy down and dead fuels.
Negligible midflame winds suppress any spread. In those areas exposed to sun and wind that have
available fuels, some spread could occur
Resources will remove & backhaul remaining hose and begin suppression repair action in division A/M that has been deemed safe to do so. In Division P/W, resources will remove & backhaul remaining hose and begin suppression repair action where it has been deemed safe to do so. Resources will continue to improve containment contingency lines along FS road 60. MIST tactics are being implemented by resources.
|Projected Incident Activity|
Projected Incident Activity, Potential, Movement, Escalation, or Spread and influencing factors during the next
operational period and in 12-, 24-, 48-, and 72-hour time frames:
12 hours: Good overnight relative humidity recovery limited the burn period to a few hours in the midafternoon. Fire continues to smolder in fuels comprised of deep duff and heavy down dead that
have recovered from recent rainfall.
Light terrain driven winds Thursday with temperatures continuing to trend higher.
Temperatures should soar into the 80s with relative humidity values dipping into the mid
teens. Increased potential for spread in areas retaining heat near available fuels however, light
winds limit spread potential.
High pressure dominates with resultant temperature and relative humidity values exceeding
seasonal norms. Temperatures around 80 and relative humidity values only dip to around 20%.
Continuing potential for spread in areas retaining heat near available fuels however, light
winds continue to limit spread potential.
Moving into the weekend will finally bring temperatures down 5 to 10 degrees from midweek
highs with daytime humidity recoveries not dipping as low. Overnight humidity recoveries will
also improve late in the week. Decrease in temperatures coupled with increased relative
humidity values should moderate spread potential while consumption of deep duff and heavy
down dead fuels continues to be the observed trend.
Anticipated after 72 hours:
Temperatures remain above normal moving into next week, but are not as hot as
what was observed during the previous week. Humidity minimums and
recoveries will be better than last week. No chance of precipitation looks present
through the middle of next week. ERC values continue trending slowly higher
however, those values should remain below the 70th percentile for the next.
The weather pattern becomes rather repetitive as we remain under
the ridge of high pressure. Temperatures continue to be well above
normal with humidity values dipping into the teens for the next
couple days. Pushing into the weekend will bring temperature down
a few degrees with humidity minimums rising into the 20s.
Overnight humidity recoveries should improve moving forward. Over
the next few days we will start to accumulate smoke from other
fires as transport winds remain weak.