

http://www.wrh.noaa.gov/fgz
A CLOSED LOW IS FORECAST TO EVOLVE JUST OFF THE CALIFORNIA COAST BY MONDAY...DOWN STREAM AND AT THE BASE OF THE BLOCKING PATTERN. A LOW NEAR 140W PER WATER VAPOR IMAGERY IS FORECAST TO WEAKEN AND MOVE NORTHEAST...THE GFS INDICATES THIS MOISTURE WILL BE INGESTED IN TIME INTO THE LOW OFF THE CALIFORNIA COAST. BOTH THE GFS AND ECMWF ARE IN CLOSE AGREEMENT WITH THE POSITION OF THE LOW. WE HAVE INCREASED POPS TO HALF WHAT GUIDANCE IS SHOWING...MAINLY DUE TO THE UNCERTAINTY IN HOW THE MODELS WILL HANDLE THIS BLOCKING PATTERN. THE SYSTEM IS FORECAST TO MOVE EAST OF THE AREA BY FRIDAY.
ANOTHER MUCH COLDER SYSTEM IS FORECAST BY THE GFS TO DROP SOUTH ALONG THE ROCKIES BY SATURDAY BRINGING INCREASING CHC`S OF PRECIP BACK TO ARIZONA ONCE AGAIN. A FAIRLY STRONG COLD FRONT IS ALSO ASSOCIATED WITH THIS SYSTEM. CURRENT MODEL FORECAST TAKES MOST OF THE ENERGY TO THE EAST ALONG WITH THE SURFACE COLD FRONT...IT IS TOO EARLY TO KNOW FOR SURE WHETHER THIS SYSTEM WILL DEVELOP FARTHER TO THE WEST...WHICH WOULD MEAN A COLDER AND WETTER SCENARIO FOR ARIZONA. THIS SYSTEM WILL HAVE TO BE WATCHED MORE CLOSELY AS IT GETS CLOSER.