Thirtymile Fire - USDA Forest Service

More documents

Recommendations

Info

Appendix: Fire Behavior Entrapment Phase (from 3:20 p.m. to 5:00 p.m. July 10th) At 3:20 p.m. the fire began uphill crowning runs from base of east slope. Slopes of nearly 100%, dense forests, and upslope convective winds combine to move this fire uphill at approximately 1.25 miles per hour (100 chains per hour). Spotting was pervasive from all active portions of the fire both in the canyon floor, and up the east slope. The fire established a convection column on the hillside east of the canyon floor. Spot fires became established east of the road 0.4 miles Fire Area 3:20 p.m. to 4:40 p.m. Road Entrapment Area Chewuch River Point of Fire Origin N from the main fire area. Fire Behavior Figure 4. Thirtymile Fire Spread 3:20 p.m. to 4:40 p.m. July 10 th Within an hour the fire in the canyon floor began a sustained torching run in tree crowns and at 4:34 p.m. crossed the road at the entrapment point. The up canyon spread of the fire up to this point had been parallel to the road. With a 90-degree turn in the road to the SE, the orientation of fire spread was now directly perpendicular to the road. A variety of sites and fuel types describe conditions within the Chewuch River canyon. This difference is significant, insofar as it may have influenced tactical decisions as the fire moved between fuel types through July 10. At the point of origin, where the fire was first attacked, spruce and alder dominate the site within a riparian zone. Aspen is also nearby. This is a wetter site relative to the drier surrounding areas where fir, lodgepole, and ponderosa pine occur and 57
Appendix: Fire Behavior where the fire made its largest runs on the afternoon of July 10 th . Contrasting patterns of fire behavior were observed between the wetter fuel types in the riparian zones and the drier upland fuel types. Initially, the fire spread was principally influenced through torching and spotting in the wetter types, while sustained crowning better defined fire spread in the drier types. The differing patterns of fire behavior were influenced both by the nature of the fuel types, and increasingly drier and warmer conditions encountered as the day progressed. It is remarkable that after the fire, although there are isolated patches of firescorched and fire-killed trees in the vicinity of the point of origin, much of the area within the riparian zone where the fire was first attacked remains unburned. When the fire spread out of the riparian zone, as weather conditions worsened, fire intensities and rates of spread increased considerably. The fuels type and drier conditions were more conducive to rapid spread rates and more severe fire behavior. Notably, entrapment occurred in Fire Area by 5 p.m. Deployment Area Road Point of Fire Origin N Fire Behavior Figure 5. Thirtymile Fire Spread by 5:00 p.m. July 10 th 58
Page 1 and 2:
Thirtymile Fire Investigation Repor
Page 3 and 4:
Accident Investigation Factual Repo
Page 5 and 6:
Investigation Team of the Thirtymil
Page 7 and 8:
Prologue In Memory Of Tom Craven Ka
Page 9 and 10:
Executive Summary He turned the van
Page 11 and 12:
Incident Overview Thirtymile Fire V
Page 13 and 14:
Incident Overview The Entiat IHC wa
Page 15 and 16: Incident Overview pumps with kits,
Page 17 and 18: Incident Overview Incident Organiza
Page 19 and 20: Incident Overview At 12:08 p.m. Pet
Page 21 and 22: Incident Overview of the fire and c
Page 23 and 24: Incident Overview The Entrapment Th
Page 25 and 26: Incident Overview Figure 10. The Ro
Page 27 and 28: Incident Overview Conditions outsid
Page 29 and 30: Incident Overview References 1. Dis
Page 31 and 32: Findings Significant Equipment Find
Page 33 and 34: Environment Findings 8. No Spot Fir
Page 35 and 36: Environment Findings 36. The deploy
Page 37 and 38: Equipment Findings 9. The following
Page 39 and 40: People Findings People Findings Sig
Page 41 and 42: People Findings the road and recomm
Page 43 and 44: Management Findings Management Find
Page 45 and 46: Management Findings • The IC was
Page 47 and 48: Management Findings 25. * Between 3
Page 49 and 50: Standard Fire Orders Standard Fire
Page 51 and 52: Watch Out Situations Watch Out Situ
Page 53 and 54: Epilogue Epilogue The Investigation
Page 55 and 56: Appendix: Investigation Team Thirty
Page 57 and 58: 48 Appendix: Investigation Team
Page 59 and 60: Appendix: Time Line Incident Time L
Page 61 and 62: Appendix: Time Line Event Time/Date
Page 63 and 64: Appendix: Fire Behavior Appendix: F
Page 65: Appendix: Fire Behavior Transition
Page 69 and 70: Appendix: Fire Behavior extending f
Page 71 and 72: Appendix: Fire Behavior low since t
Page 73 and 74: Appendix: Fire Behavior 100% and in
Page 75 and 76: Appendix: Weather Appendix: Weather
Page 77 and 78: Appendix: Weather 2:00 p.m. (PDT) w
Page 79 and 80: Appendix: Weather Weather Appendix
Page 87 and 88: Appendix: Weather .WEDNESDAY... SKY
Page 89 and 90: Appendix: Human Factors fire approa
Page 91 and 92: Appendix: Human Factors one and onl
Page 93 and 94: Appendix: Human Factors Entiat IHC
Page 95 and 96: Appendix: Equipment Appendix: Equip
Page 97 and 98: Appendix: Equipment • Four of the
Page 99 and 100: Appendix: Equipment issued in sprin
Page 101 and 102: Appendix: Equipment THIRTYMILE FIRE
Page 103 and 104: Appendix: Equipment LO WER DEPLO YM
Page 105 and 106: Appendix: Qualifications Name North
show all

Thirtymile Fire - USDA Forest Service

Create successful ePaper yourself

Delete template?

Save as template?