S-290 Questions with verified answers

S-290 Questions with verified answers
1-Hour Dead Fuel Size Ans✓✓✓ Less than 1/4"


10-Hour Dead Fuel Size Ans✓✓✓ 1/4" - 1"


100-Hour Dead Fuel Size Ans✓✓✓ 1" - 3"


1000-Hour Dead Fuel Size Ans✓✓✓ 3" - 8"


3 Clouds that are associated with an unstable atmosphere Ans✓✓✓ 1) Cumulus
2) Cumulonimbus
3) Thunderstorm


3 main contributing factors of Spotting Ans✓✓✓ 1) Firebrand source
2) Transportation
3) Receiving fuels and environment


3 Methods for Obtaining Live Fuel Moisture Ans✓✓✓ 1) Moisture Content
(fireline handbook, appendix B)
2) Live Fuel Sampling
3) Online Data Sources


3 stages of a thunderstorm Ans✓✓✓ cumulus, mature, dissipating

, 3 strong winds that promote extremem fire behavior Ans✓✓✓ - Frontal
- Thunderstorm
- Foehn
- Surface winds above 10mph


3 Ways Topography can Alter Wind Direction & Speed Ans✓✓✓ 1) Mechanical -
venturi
2) Turbulent - eddying
3) Frictional - drag


A column of cold, dry air is (lighter or heavier) and generally more (stable or
unstable) than a column of warm, humid air. Ans✓✓✓ Heavier


Stable


A temperature inversion is a layer of stable air where temperature
(increases/decreases) with an increase in altitude Ans✓✓✓ Increases


Adding water vapor to an air parcel will make it _____________ Ans✓✓✓ Lighter


Air that is forced to rise as it is pushed against mountainous terrain Ans✓✓✓
Orographic


An unstable atmosphere promotes the formation of _____________ Ans✓✓✓
Updrafts