JANUARY...--
PROBABLY INFLUENCED BY EL NINO, A STRONG POLAR JET DEVELOPED
OVER THE PACIFIC AND BROUGHT SEVERAL STORM SYSTEMS TO THE COAST WITH
PERIODS OF STRONG WIND, HEAVY RAIN, AND MOUNTAIN SNOW FROM THE 18TH TO
THE 22ND. THE BAROMETRIC PRESSURE REACHED AN ALL-TIME RECORD LOW OF
29.21 INCHES ON THE 20TH AT LINDBERGH FIELD. STRONG SOUTHERLY WINDS
ALLOWED DEEP MOISTURE TO INVADE THE DESERTS. RAINFALL RANGED FROM 2 TO
8 INCHES IN THE DESERTS, 4 TO 8 INCHES WEST OF THE MOUNTAINS, AND 6 TO
12 INCHES ON THE COASTAL SLOPES. SNOWFALL OF 40 TO 60 INCHES WAS
REPORTED AT THE HIGHER RESORTS WITH UP TO SEVEN FEET AT THE HIGHEST SKI
RESORTS. WIDESPREAD URBAN AND SMALL STREAM FLOODING WAS OBSERVED DURING
THIS PERIOD. SOME OF THE WORST FLASH FLOODING OCCURRED IN THE HIGH
DESERT ON THE 21ST DUE TO THE PROLONGED HEAVY RAINFALL. MANY HOMES AND
SCHOOLS SUSTAINED DAMAGE AND MANY ROADS WERE WASHED OUT. ON THE 19TH A
TORNADO HIT COSTA MESA AND NEWPORT BEACH, AND ANOTHER HIT LAGUNA BEACH,
BOTH CAUSING LOCAL PROPERTY DAMAGE. WINDS WERE MEASURED ABOVE 90 MPH IN
NEWPORT HARBOR THAT DAY.
FEBRUARY...
AN UPPER-LEVEL TROUGH ON THE 5TH THROUGH THE 7TH, TAPPED SUBTROPICAL
MOISTURE RESULTING IN LOTS OF RAIN AND ISOLATED THUNDERSTORMS. RAINFALL
RANGED FROM 2 TO 5 INCHES OVER ORANGE, WESTERN PORTIONS OF SAN
BERNARDINO COUNTY, AND THE MOUNTAINS OF RIVERSIDE AND SAN DIEGO
COUNTIES. 1 TO 1.5 INCHES FELL OVER WESTERN SAN DIEGO COUNTY. LESS THAN
ONE-HALF INCH FELL IN THE SOUTHERN DESERTS, BUT OVER ONE INCH SOAKED
PORTIONS OF THE NORTHERN DESERTS. THERE WERE NUMEROUS REPORTS OF
FLOODING. LATE ON THE 26TH THROUGH THE 27TH, LOW PRESSURE DROPPED
SOUTHEAST ALONG THE COAST BRINGING WIDESPREAD SHOWERS AND ISOLATED
THUNDERSTORMS WITH SMALL HAIL TO THE REGIONBUT VERY LITTLE SNOW.
RAINFALL RANGED BETWEEN 0.50 INCH AND 1.5 INCHES WEST OF THE MOUNTAINS,
TO 1.5 TO 3 INCHES ON THE COASTAL SLOPES. RAINFALL WAS SPOTTY AND LESS
THAN 0.50 INCH IN THE SOUTHERN DESERTS, WHILE THE NORTHERN DESERTS
REPORTED BETWEEN 0.33 AND 1.33 INCHES. AREAS OF URBAN FLOODING WERE
REPORTED WITH SOME OF THE HEAVIER SHOWERS AND THUNDERSTORMS.
MARCH...
AN EXTENSIVE LOW PRESSURE TROUGH STRETCHING ALONG THE WEST COAST OF
NORTH AMERICA GUIDED SEVERAL WEAK TO MODERATE STORM SYSTEMS THROUGH THE
REGION DURING THE FIRST TEN DAYS OF THE MONTH. THIS WAS REPLACED BY A
STRONG HIGH PRESSURE RIDGE AROUND MID MONTH WHICH BROUGHT AN EXTENDED
PERIOD OF DRY AND WARMER THAN NORMAL WEATHER UNTIL THE FINAL DAYS OF
THE MONTH WHEN A COLD TROUGH PUSHED IN FROM THE NORTHWEST. DESPITE THE
MOIST START, MARCH CAME UP DECIDEDLY DRY, CONTINUING THE TREND OF DRY
MARCHES IN RECENT YEARS.
APRIL...
A BROAD AREA OF LOW PRESSURE IN THE UPPER ATMOSPHERE DOMINATED THE
WEATHER THROUGH MUCH OF APRIL, BRINGING ABOVE AVERAGE PRECIPITATION
(RAINFALL AND SNOWFALL) AND BELOW AVERAGE TEMPERATURES TO SOUTHERN
CALIFORNIA.
MAY...
THE COOL SPRING CONDITIONS CONTINUED WITH AVERAGE MONTHLY TEMPERATURES
GENERALLY BETWEEN TWO AND FOUR DEGREES BELOW NORMAL. ON THE 23RD A VERY
COLD, LATE SEASON STORM SLID THROUGH SOUTHERN CALIFORNIA ACCOMPANIED BY
THUNDERSTORMS, RECORD COLD, AND MODERATE RAIN AND SNOW SHOWERSUP TO 5
INCHES OF SNOW PILED UP AT HIGHER ELEVATIONS. AFTER THIS STORM, THE
RAINFALL SEASON CAME TO AN ABRUPT END.
JUNE...
WITH A HIGH PRESSURE RIDGE AND A STRONG ZONAL JET, SEASONALLY HOT
WEATHER DEVELOPED DURING THE FIRST WEEK OF JUNE. THE FAR INLAND AREAS
HEATED DRAMATICALLY, DRIVING STRONG ONSHORE FLOW AND A PERSISTENT
MARINE LAYER ALONG THE COAST. DURING THE SECOND WEEK, A LARGE TROUGH
DEVELOPED BRINGING COOLING, AND A DEEPER MARINE LAYER WITH PERIODS OF
DRIZZLE WEST OF THE MOUNTAINS. THE COOL SPRING CONDITIONS CONTINUED
WITH AVERAGE MONTHLY TEMPERATURES GENERALLY BETWEEN TWO AND FOUR
DEGREES BELOW NORMAL.
JULY...
A BROAD AND PERSISTENT UPPER-LEVEL TROUGH DOMINATED THE WEATHER DURING
THE MONTH, KEEPING TEMPERATURES WELL BELOW THE SEASONAL AVERAGE. WEST
OF THE MOUNTAINS A DEEP MARINE LAYER DRIPPED SOME LIGHT RAIN AND
DRIZZLE FROM TIME TO TIME. THE TROUGH RETROGRADED WEST AS HIGH PRESSURE
BUILT OVER THE INTERIOR OF THE U.S. DURING THE SECOND WEEK, BRINGING A
FLEETING WARM WEATHER AND OUR FIRST SURGES OF MONSOONAL MOISTURE. LOW
PRESSURE QUICKLY REDEVELOPED JUST OFF THE COAST AGAIN AND PERSISTED
THROUGH THE END OF THE MONTH, ALLOWING A DEEP MOIST MARINE LAYER TO
KEEP IT COOL, AND EVEN PRODUCE SOME DRIZZLE AND MEASURABLE LIGHT RAIN.
FARTHER INLAND, SEASONALLY HOT WEATHER PREVAILED. NUMEROUS LOW MAXIMUM
DAILY RECORDS WERE SET THROUGHOUT THE MONTH. THE ALL-TIME RECORD LOW
MAXIMUM FOR SAN DIEGO FOR JULY WAS TIED ON THE 8TH WITH 64 DEGREES.
AUGUST...
FOR MOST OF THE MONTH, TEMPERATURES WERE 4-5 DEGREES BELOW NORMAL ALONG
THE SAN DIEGO COUNTY COAST DUE TO A STRONG COOL SEA BREEZE. THE
SEASONALLY STRONG SUBTROPICAL HIGH DID MAKE A MOVE NORTH AND WEST
DURING THE THIRD WEEK, SETTING AN EASTERLY MONSOONAL FLOW OF MOIST AND
UNSTABLE AIR. THIS TRIGGERED SCATTERED SHOWERS AND THUNDERSTORMS ON THE
25TH AND 26TH WITH SOME OF THE STORMS REACHED SEVERE LIMITS WITH HEAVY
RAIN, LARGE HAIL, AND DAMAGING WINDS. FLASH FLOODING AND DEBRIS FLOWS
OCCURRED NEAR FOREST FALLS AND HEMET ON THE 25TH, AND NEAR WRIGHTWOOD
AND WARNER SPRINGS ON THE 26TH. THE MOIST AND UNSTABLE MONSOONAL FLOW
WAS QUICKLY SNUFFED OUT BY A STRONG LOW PRESSURE TROUGH DURING THE
FINAL WEEK. AUGUST CONTINUED THE COOL TREND OBSERVED MUCH OF THE
SUMMER.
SEPTEMBER...
HIGH PRESSURE ALOFT AND OFFSHORE FLOW DEVELOPED BRINGING THE HOTTEST
WEATHER OF THE YEAR WEST OF THE MOUNTAINS THE DAY AFTER SUMMER ENDED.
MANY RECORD HIGH TEMPERATURES WERE REACHED ON THE 26TH AND 27TH. SOME
OF THE HIGHEST ALL-TIME TEMPERATURES WERE REACHED ON THE 27TH, LIKE THE
113 DEGREES AT DOWNTOWN LOS ANGELES. THUNDERSTORMS FROM A LOW PRESSURE
OFF THE COAST BROKE OUT ON THE 30TH IN SAN DIEGO COUNTY. THE STORMS
PRODUCED HUNDREDS OF LIGHTNING STRIKES THAT SPARKED SEVERAL SMALL
FIRES. ALL SIGNIFICANT RAIN FOR THE MONTH FELL WITH THE STORM ON THE
30TH.
OCTOBER...
OCTOBER WAS A WET MONTH. IN FACT, IT WAS THE 4TH WETTEST ON RECORD IN
SAN DIEGO. IN THE BEGINNING OF THE MONTH, A LOW PRESSURE TROUGH PUMPED
MOIST AND UNSTABLE AIR INTO SOUTHERN CALIFORNIA, AND PRODUCED SEVERAL
ROUNDS OF SHOWERS AND THUNDERSTORMS. MOST OF THE STORMS WERE
CONCENTRATED IN THE MOUNTAINS AND DESERTS AND WERE FAST-MOVING. SOME OF
THESE STORMS WERE CONSIDERED BY LONG TIME RESIDENTS IN THE HIGH DESERT
AS THE MOST INTENSE EVER EXPERIENCED. LOCAL FLOODING RESULTED. BY
MID-MONTH, A SECOND VIGOROUS STORM SYSTEM CAME THROUGH THE REGION. SOME
RAIN FELL WEST OF THE MOUNTAINS ALMOST EVERY DAY FROM THE 15TH THROUGH
THE 25TH BEFORE THE ATMOSPHERE FINALLY DRIED OUT WITH A BRIEF EPISODE
OF SANTA ANA WINDS.
NOVEMBER...
DURING THE FIRST WEEK, HIGH PRESSURE ALOFT CAUSED RECORD-BREAKING HEAT,
AND IN SAN DIEGO PRODUCED THE HOTTEST NOVEMBER DAY IN HISTORY ON THE
4TH WITH A READING OF 100 DEGREES. IT WAS ACTUALLY HOTTER AT THE COAST
THAN IT WAS INLAND. DURING THE THIRD WEEK, A COLD TROUGH DIGGING DOWN
THE COAST SENT SEVERAL WAVES OF PRECIPITATION TO THE REGION. THE
SYSTEM BROUGHT SEVERAL INCHES OF SNOW TO THE HIGHEST ELEVATIONS IN THE
SAN BERNARDINO MOUNTAINS. RAINFALL WAS WIDESPREAD WEST OF THE MOUNTAINS
WHERE 0.5 TO 2 INCHES FELL. IT WAS CONSIDERABLY WETTER ON THE COASTAL
SLOPES WHERE 3 TO 5 INCHES WAS REPORTED.
DECEMBER...
THE FIRST HALF OF THE MONTH WAS DRY WITH WEAK HIGH PRESSURE
DOMINATING OUR WEATHER. THEN A STRONG SUBTROPICAL JET STREAM FROM THE
CENTRAL PACIFIC SENT A LONG FETCH OF MOISTURE INTO CALIFORNIA FOR A
WEEK. FROM THE 17TH TO THE 23RD MORE THAN 28 INCHES OF RAIN FELL IN
LYTLE CREEK AND CRESTLINE, 6 TO 12 INCHES IN ORANGE COUNTY AND MOST
VALLEYS, OVER 8 INCHES IN PARTS OF THE HIGH DESERT, ALMOST 5 INCHES IN
SAN DIEGO, AND LESS THAN ONE INCH IN THE LOWER DESERT. NUMEROUS DAILY
RAINFALL RECORDS WERE BROKEN. IT WAS THE WETTEST WEEK SINCE JANUARY
2005. A FINAL QUICK STORM HIT ON THE 29TH, WHICH BROUGHT THE DECEMBER
RAINFALL TOTALS AMONG THE GREATEST ON RECORD FOR MANY LOCATIONS.
$$
MM
Source: http://www.wrh.noaa.gov/total_forecast/getprod.php?wfo=sgx&sid=SGX&pil=PNS
Check out http://groups.yahoo.com/group/californiadisasters/
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