A mackerel sky is an indicator of moisture (the cloud) and instability (the cirrus-cumulus form) at intermediate levels, 8000-20,000 ft. I took the picture above, Sunday morning. I knew something was up when the NWS started mentioning a shift in the weather pattern.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
100 AM PST SAT JAN 16 2010
.HYDROLOGY...THE PRECIPITATION NEXT WEEK HAS THE POTENTIAL TO GENERATE RAINFALL OF 5 TO 8 INCHES NEAR THE COAST WITH CLOSE TO 20 INCHES ON THE COASTAL MOUNTAIN SLOPES. TYPICALLY WETTER LOCATIONS ON THE COASTAL MOUNTAIN SLOPES COULD RECEIVE NEAR 30 INCHES OF RAINFALL. AT HIGHER ELEVATIONS IN THE SAN BERNARDINO AND RIVERSIDE COUNTY MOUNTAINS...MOSTLY ABOVE 6000 FEET...4 TO 6 FEET OF SNOWFALL IS POSSIBLE WITH LOCAL LARGER AMOUNTS.
THERE WILL ALSO BE THE POTENTIAL FOR THUNDERSTORMS
AND WATERSPOUTS AT TIMES NEXT WEEK AS THESE STRONG STORM SYSTEMS MOVE INTO
THE COASTAL WATERS.
This was confirmed by a Sciencedude blog quoting Mark Moede of the San Diego office by Epic weather on it's way.
A SERIES OF STORMS EMBEDDED IN A STRONG PAC JET WILL BRING A POTENTIALLY EPIC WET WEATHER EVENT NEXT WEEK. - MOEDE
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