Report: Chisholm wildfire entrapment investigation - FPInnovations ...

To: Slave/LLB fire ops
Issued: May 26, 2001
Afternoon Spot Forecast
For tonight and Saturday
For: Chisholm Fire 63
Synopsis:
Very light shower activity that affected the zone near noon has moved to the northeast and clearing is occurring this
aftn. The higher RH values at noon have given some slight FFMC relief. Dewpoints near 6 deg are expected by late
aftn and will allow minimum RH values late in the burning period of 35%. Airmass remains unstable and a risk of
TRW RW will persist into the evening. Winds increasing this aftn and evening as a strong pressure gradient begins
to develop with the formation of a new low pressure system over north-central BC and the surface high pressure area
remains over northern Alta. Moderate E-SE winds of 15-20 km/h likely persisting overnight. Good ventilation
overnight. Strong SE winds , lower RH values and high temperatures Sunday will generate very easy burning
conditions and possible erratic fire behaviour given the extreme BUI values of 118 expected Sunday. FIRE
WEATHER ADVISORY WILL BE IN EFFECT ON SUNDAY.
Low Temp tonight: 10°C
Max RH tonight: 70%
Wind tonight: E-SE 15-20 km/h persisting overnight
Max Temp tomorrow: 27°C
Low RH tomorrow: 25%
Wind tomorrow: E-SE 25g50 km/h possible gusts to 60 km/h
Pcpn chance (%), amount, and type during next 24 hours: 30L TRW/RW
(Note L means 0.5-5mm, M means 5-20mm, and H means over 20mm in next 24 hours)
LFS WX
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