INTERAGENCY FIRE WEATHER CENTER – PREDICTIVE SERVICES UNIT

 

THURSDAY, JUNE 21, 2018

SOUTHERN CALIFORNIA GEOGRAPHICAL AREA COORDINATION CENTER

RIVERSIDE, CALIFORNIA

Sunny, warm weather will continue through the weekend as high pressure remains lodged over the Southwest.  Today and Friday will likely be the warmest 2 days over Southern California as many inland valley locations top out in the upper 90s.  This weekend, slightly stronger onshore flow will bring marine layer stratus and a bit of cooling to the valleys.  Central California will not see much change in temperatures and highs will be in the 100-105 degree range across the San Joaquin Valley and lower Sierra Foothills through Monday.  Winds will be light overall with just some sea breezes to 15 mph along the central coast each afternoon.  Minimum RH will drop into the teens across the central coast interior and areas in and near the desert.  Light winds and clear skies will allow for good recovery at night. Long range models indicate a series of troughs may weaken the high pressure ridge, bringing slightly cooler weather to all areas during the second half of next week.  No thunderstorms are expected through the end of the month.

Long daylight hours, sunny skies and temperatures 5-10 degrees above normal will allow for very good burning conditions each afternoon. Look for rapid mixing out of inversions during the mid-morning hours, except where the marine layer is present.  Dead fuel moisture is quite low over most areas and is now close to the 5 percentile figure in the valley and foothill regions.  Fuels are driest over Southern California with moisture conditions are near record lows.  Live fuel moisture is still well above critical readings and new starts will show only moderate growth in mixed live and dead vegetation due to the lack of wind.  IA will likely be moderate the next several days with the heaviest concentration of new starts likely being in the Sierra Foothills.  IA should be successful in most cases due stable conditions and a lack of wind through the weekend. 

For additional fuel and weather information, including the Santa Ana Wildfire Threat Index, please visit:

 

http://gacc.nifc.gov/oscc/predictive/weather/index.htm