2011 Fire Season Outlook: An initial look at Weather/Climate/Fuels Rich Naden/Chuck Maxwell Southwest Area Predictive Services
2011 Fire Season Outlook: An initial look at Weather/Climate/Fuels
Rich Naden/Chuck Maxwell Southwest Area Predictive Services
Key Drivers to 2011 Winter Weather / Climate
Negative AO (Arctic Oscillation)Strong La Nina!Negative NAO (North Atlantic
Oscillation)Low Solar Activity Negative PDO (Pacific Decadal
Oscillation)OK….so what does this climate index alphabet soup mean for the Southwest
Area Climate expectations and Fire Season 2011 ????
Weekly Sea Surface Temperature Anomaly Past 20 Weeks
Blue – Below Average Sea Surface TemperaturesYellow/Orange – Above Average Sea Surface Temperatures
However…this has been an atypical La Nina winter weather pattern so far….but WHY?!?!
January
February
- AO and Low Solar Output appear to be presently dominating the pattern
Fuels Considerations
Lots of fine herbaceous fuels, limited compactionUsual strain of dry/drought conditions on live and dead
fuel moisture dynamics
July 15th 2010
September 14th 2010
Upcoming Weather Pattern/Climate Anomalies Forecast – rest of JAN
• Warmer than normal western ½ to 1/3 of Arizona• Cooler than normal southeastern 1/3 of New Mexico• Drier than normal northwestern ½ of Arizona• Best chance of moisture across the eastern ½ of New Mexico into west Texas
Temperatures Precipitation
Upcoming Weather Pattern/Climate Anomalies Forecast – FEB
< TEMP >
< PRECIP >
Likely to start February Most of the remainder of February
Strong La Nina 500MB Height Anomalies
Moderate La Nina 500MB Height Anomalies
Upcoming Weather Pattern/Climate Anomalies Forecast – APR-MAY
Upcoming Weather Pattern/Climate Anomalies Forecast – APR-MAY Strong La Nina Surface Temp.
Anomalies
Moderate La Nina Surface Temp. Anomalies
Strong La Nina Surface Precip. Anomalies
Moderate La Nina Surface Precip. Anomalies
< TEMP >
< PRECIP >
Upcoming Weather Pattern/Climate Anomalies Forecast – JUL-SEP
Decent Monsoonal Moisture More than Likely!!??
Strong and Moderate La Nina’s
Moderate La Nina’s
• Despite an overall drier weather pattern region-wide expect the focus to remain across the southeastern ½ of New Mexico into west Texas• Coolish pattern across the Intermountain West could develop and remain in charge by March/April-May across the northwestern ½ or so of AZ likely leading to a slow start to Fire Season 2011 for western sections• Areas further south/east likely warmer and will eventually be the recipients of more frequent wind combined with the milder temperatures• Higher elevations have had some decent snowfall over the past month or so providing some compaction of fuels • Potential remains elevated for an active late winter>early summer fire season…especially southern & eastern halves of SWA
Forecast Points for Fire Weather