Thirtymile Fire - USDA Forest Service

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Appendix: Fire Behavior the drier fuels at a bend in the road (perpendicular to the direction of spread), where the only path of down-canyon escape was blocked by the head of the fire moving up-canyon. This was a result of the tactical decision to suppress spot fires ahead of the main fire along the road, which placed firefighters under increasingly severe weather conditions in a different fuel type that exhibited different, more severe, fire behavior. By 5:00 p.m. the fire had become well-established on the canyon floor east and west of the Chewuch River and on the canyon slope east of the river. Deployment Phase (from 5:00 p.m. to 8:00 p.m. July 10 th ) At about 5:00 p.m., the fire was firmly established on the hillside east of the Chewuch River. Strong uphill and up canyon fire movement had carried the fire in an easterly direction and crown fire activity was engulfing the hillside east of the deployment location. An active fire front was also located in the canyon bottom in the vicinity of the point of entrapment along a line Fire Area by 5:30 p.m. Deployment Area Point of Fire Origin N Fire Behavior Figure 6. Thirtymile Fire Spread by 5:30 p.m. July 10 th 59
Appendix: Fire Behavior extending from the base of the northern hillside to the hillside south of the fire. Strong indrafts and massive spotting associated with the crown fire high on the hillside east of the river intensified the fire activity in the canyon floor. At approximately 5:00 p.m., the fire in the canyon floor transitioned to an active crown fire moving up canyon towards the deployment zone at spread rates estimated to be in excess of 1.6 miles per hour (125 chains per hour). Two columns had now formed, one on the hillside east of the river and a second column located on the canyon floor. The canyon floor column was initially oriented horizontally directly towards the deployment zone. While the exact interaction of the columns is unknown, it is felt that the column on the hillside south of the river established strong up canyon winds which contributed to the speed and intensity of the canyon floor fire front as it moved up canyon. Immediately preceding fire shelter deployment., embers falling from the fire columns rained down on the deployment site. The flaming front and plume of hot gasses from the canyon floor fire reached the deployment site at 5:24 p.m. The canyon floor fire continued to intensify as it moved past the deployment site to the east and its column began to rise vertically. The column in the canyon floor and the column on the hillside east of the river eventually merged as the fire moved up canyon. The rate of fire movement and intensity of fire activity is characteristic of crown fires observed historically. During this period of time the fire also began to extend up the northern hillside north of the creek. The scarcity of fuels on this hillside limited the fire behavior, which consisted initially of spotting and isolated torching. Fire behavior became more severe as the forest became denser on top of the ridgeline and north of the deployment site. Fire continued up canyon at 1.6 miles per hour (125 chains per hour) reaching the trailhead within approximately 1 hour. 60
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Thirtymile Fire Investigation Repor
Page 3 and 4:
Accident Investigation Factual Repo
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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
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Incident Overview Thirtymile Fire V
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Incident Overview The Entiat IHC wa
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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 and 66: Appendix: Fire Behavior Transition
Page 67: Appendix: Fire Behavior where the 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
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Thirtymile Fire - USDA Forest Service

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