I feel compelled to post in light of Ellen's rescue; glad she is safe.
It is always preferable to have someone with you when you hike. However, the two best ways to reduce your level of risk in hiking San Jacinto are (a) review National Weather Service forecasts in detail, and (b) always carry a Personal Locator Beacon, regardless of how many people you are with.
First, be very aware of the current and forecasted weather for the entire mountain.
Here is where to find the weather at the 10,539' elevation level;
http://www.wrh.noaa.gov/forecast/MapCli ... -116.68125
Here is the weather at approximately 8,715' elevation:
http://www.wrh.noaa.gov/forecast/MapCli ... &map.y=109
Here's the weather at the start of Skyline:
http://www.wrh.noaa.gov/forecast/MapCli ... &map.y=111
Consult all three in detail before any SJ hike.
Second, carry the best PLB money can buy at all times, regardless of how many persons you are with. Here's my recommendation:
http://www.rei.com/product/751974
Even if you are with another person and they fall, hit their head, break their leg, have a heart attack, etc., and find themselves in a life threatening situation, are you going to hike for hours back to the Tram or Humber Park to contact authorities or would you rather have the ability to effect a rescue (again, only if life threatening) by using a PLB? Again, I can think of no rational reason not to carry a PLB at all times, regardless of the number of hikers you are with. Carrying a PLB should not be required or regulated, it should be a matter of choice. Clear thinking persons will do the right thing and carry one.
Of course, a PLB is useless if the weather is so bad no one can rescue you. As you look at the weather forecast, ask yourself "given the forecast, could I be rescued if needed?" High winds, low cloud levels, imminent storms, lightning, etc are all issues to consider if they might impede a rescue.
In the last four years I have hiked from Humber Park to the SJ summit 27 times, often alone. Knowing the weather will not be an issue on my trip, combined with a PLB in my bag, helps reduce the risk to what I believe is acceptable. The trip will never be risk free; work to reduce the risk by paying attention to weather and using a PLB every time.
Hope this helps and may Ellen have a speedy recovery!
