Brent’s Carpet One – Banner
All Americans Bail Bonds – Banner
Beyond Harmony – Banner
SCV Senior Center – Touch A Truck 2015 – Banner
Newhall Land – 2015 – Banner
College Of The Canyons – Banner
IHOP – Banner
Green Convergence – Sun Power – Banner
Simply Taylored – Banner
PizzaRev – Banner
Adage IT – Banner
Newhall Land – Banner
Union Bank – Banner
AV Party Rental – Banner
San Diego Zoo – Generic – Banner
Santa Clarita Transit – Dump the Pump – Banner
SCV Chinese School – Banner
Action Family Counseling – Banner
Valencia Town Center – Farmer’s Market – Banner
Facey – Banner
Hugo Naturals – Banner
Nothing Bundt Cakes – Banner
Academy Swim Club – Banner
Disneyland – Diamond Celebration – Banner
SCV Chinese School – Banner 2
Galpin Motors – Banner
Santa Clarita Autosound – Banner
Patterson’s Collision Center – Banner
It is forecast to be Partly Cloudy at 7:00 PM PDT on May 23, 2015
Partly Cloudy
Home » Santa Clarita News » Environment » SCV Outdoor Report » SCV Outdoor Report: Rule Of Thumb

SCV Outdoor Report: Rule Of Thumb

khts_scvoutdoorreportBy Wendy Langhans

Here’s a rule of thumb about “rules of thumb”:  professionals take measurements and amateurs use a “rule of thumb”.  For example, suppose you want to know what the weather will be like this evening.

If you’re a meteorlogist, you rely on measurements from the National Weather Service office in Oxnard.  If you’re a mom, you remind your kids to “take a sweater”, just in case.

Firefighters are professionals and so, according to my “rule of thumb”, they rely on measurements.  The LA County Fire Department’s Forestry Division measures “Live Fuel Moisture” twice a month.  Samples are taken from specific sites in the Santa Monica mountains and in the mountains surrounding our Santa Clarita Valley, including, Bouquet Canyon, Castaic and Placerita Canyon. For a look at the July 2 report, go here.


According to the S-190 Wildland Fire Behavior workbook, fuel moisture is “the amount of water in a fuel, expressed as a percentage of the oven-dry weight of that fuel”.  In other words, you gather samples of live plant material (in this case, Chamise, Purple Sage, Black Sage or California Sage).  You weigh the samples, dry them in an oven, and weigh them again; the difference in weight before and after is due to the weight of water.  Divide the weight of water by the weight of the dry sample and multiply it by 100.  And voilà – you have the live fuel moisture!


These live fuel measurements are also plotted over time, comparing this year, last year and the ~30 year average.  For an look at LA County measurements, go here.  For a look at Castaic, go here.  Right now, both local and regional levels are above the ~30 year average.

Don’t miss a thing. Get breaking news alerts delivered to your inbox.

But what do these measurements tell us?  The LA County Fire Department website explains it here:  “Fuel moisture determines if certain fuels will burn” and “how quickly and completely they will burn…”  According to the professionals, “60% is generally recognized as approaching a critical level of live-fuel moisture.”  And judging from the charts, we have not yet reached the 60% level.

But speaking strictly as an amateur, I’d suggest this rule of thumb – create a defensible space around your home.  In other words, take a sweater with you.


Upcoming Outdoor Events:

Every Saturday at 11:00 AM & 1:00 PM.  Family Nature Walk (11) and Animal Show (1) at Placerita Canyon.

For more information, click here.

Saturday, July 17, 8:00-10:00 AM.  Bird Walk walk.  Towsley Canyon.  Get out in the park before the heat of the day and enjoy a bit of bird watching and exploration. Our bird guide extraordinaire, Volunteer Naturalist Roger, will share his expertise and considerable knowledge on this easy walk. Beginners are welcome. Bring your binoculars and meet at the entrance to the park. 2 hrs. For map, click here.

Trail Maintenance Schedule.  Come join our volunteers as they help maintain our trails.  Contact Steve at for time and place.

Wednesday mornings, July 1, 14, 21 & 28.

Saturday mornings, July 10 & 24.


You can listen to stories like this every Friday morning at 7:10 a.m. on “The Hike Report”, brought to you by your hometown radio station KHTS (AM1220) and by the Mountains Recreation and Conservation Authority.

For the complete MRCA hike and activity schedule, directions to the parks and trail maps, go to

SCV Outdoor Report: Rule Of Thumb

Leave a Reply

Your email address will not be published. Required fields are marked *


You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

About KHTS AM 1220

Action Family Counseling – News Banner
Hugo Naturals – News Banner
College Of The Canyons – News Banner
All American Bail Bonds – News Banner
Beyond Harmony – News Banner
AV Party Rental – News Banner
Academy Swim Club – News Banner
Brent’s Carpet One – Tile
Newhall Land – Tile
Galpin Motors – Tile
Mannered Mutt – Tile
Academy Swim Club – Tile
SCV Chinese School – Tile