A prototype version of the parameterization for real-time alarms based on data of meteorological sensors was implemented based on feedback from CDF:
# alert conditions: # the data if based on one minute averages # 1. if RH goes below $RH_thres percent # AND if Wind Direction is between $WD_l_thres and $WD_h_thres degrees # AND if WSpeed is above $WS_thres Mph # 2. OR if Fuel Moisture drops below $FM_thres percent $RH_thres=25; # Relative Humidity threshold in percent $WD_l_thres=10; # Wind Direction low threshold in degrees $WD_h_thres=110; # Wind Direction high threshold in degrees $WS_thres=25; # Wind Speed threshold in Miles/hour $FM_thres=7; # Fuel Moisture (10 hr stick) threshold in percent # hysteresis value to clear alert # data value has to change by this amount to clear an alert condition $RH_hyst=$RH_thres+20; # Relative Humidity increase needed to clear alarm $WS_hyst=$WS_thres-10; # Wind Speed decrease needed to clear alarm $FM_hyst=$FM_thres+3; # Fuel Moisture increase needed to clear alarm # 24 hour time-of-day to re-issue alerts $RTime=7; # Still persisting alarms are ressued at this time
This is currently implemented for the sensors at the HPWREN backbone sites on Lyons Peak and Mt. Laguna, although the Mt. Laguna site currently does not utilize fuel moisture, due to some difficulties with the sensor.
The format for the messages is like:
Subject: URGENT weather sensor alert LP: RH=25.4 WD=43.8 WS=2.1 FM=6.7 AT=86.8 at 20060701.093100 More details at http://hpwren.ucsd.edu/Sensors/ LP: location (Lyons Peak) RH Relative Humidity in percent WD Wind Direction in degrees WS Wind Speed in Miles/hour FM Fuel Moisture (10 hr stick) in percent AT Outside Air Temperature in degrees Fahrenheit 20060701.093100 date.time