Areal Flood Advisory 21, NWS San Diego, CA

369 
WGUS86 KSGX 131959
FLSSGX

FLOOD ADVISORY
NATIONAL WEATHER SERVICE SAN DIEGO CA
1259 PM PDT MON AUG 13 2012

CAZ055-060-132145-
/O.CAN.KSGX.FA.Y.0021.000000T0000Z-120813T2145Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
1259 PM PDT MON AUG 13 2012

...THE URBAN AND SMALL STREAM FLOOD ADVISORY FOR MINOR FLOODING OF
URBAN AREAS HAS BEEN CANCELLED FOR WEST CENTRAL SAN BERNARDINO
COUNTY...

LAT...LON 3463 11724 3458 11667 3432 11669 3417 11682
      3440 11726

$$

HARRISON

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
925 AM PDT MON AUG 13 2012

.SYNOPSIS...
SCATTERED AFTERNOON AND EARLY EVENING THUNDERSTORMS WILL CONTINUE IN
THE MOUNTAINS...DESERTS...AND FAR INLAND VALLEYS TODAY...DECREASING
TUESDAY AND WEDNESDAY. HOT AGAIN TODAY...THEN TEMPERATURES LOWER BY
A FEW DEGREES TUESDAY AND WEDNESDAY BUT REMAIN NEAR SEASONAL
AVERAGES. A SHALLOW MARINE LAYER WILL CONTINUE PATCHY LOW CLOUDS AND
FOF OVER THE COASTAL AREAS OF SAN DIEGO COUNTY DURING THE EARLY
MORNING HOURS. FOR FRIDAY THROUGH THE WEEKEND...TEMPERATURES AGAIN
INCREASE ALONG WITH THE MONSOONAL MOISTURE...FOR A SLIGHT CHANCE OF
AFTERNOON AND EARLY EVENING THUNDERSTORMS IN THE MOUNTAINS AND
DESERTS.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

TSTM ACTIVITY CONTINUED OVERNIGHT INTO THIS MORNING OVER EASTERN
IMPERIAL AND RIVERSIDE COUNTIES. THE MORNING NKX SOUNDING AGAIN
SHOWS VERY MOIST AND UNSTABLE CONDITIONS...FAVORABLE FOR THE
DEVELOPMENT OF TSTMS LATER TODAY...MAINLY OVER THE MTNS AND DESERTS.
TSTMS ARE ALSO EXPECTED TO AGAIN DEVELOP OVER PORTIONS OF THE INLAND
EMPIRE THIS AFTERNOON. CONDITIONS ARE SIMILAR TO YESTERDAY...EXCEPT
FOR SLIGHTLY LESS PRECIPITABLE WATER. HOWEVER...ENOUGH MOISTURE
REMAINS TO ONCE AGAIN BRING THE POSSIBILITY OF LOCALIZED FLASH
FLOODING IN THE MTNS...DESERTS AND PORTIONS OF THE INLAND EMPIRE.

RECENT ACARS SOUNDINGS ALSO SHOW THE FLOW BETWEEN 800 MB AND 500 MB
BECOMING MORE SOUTHWESTERLY. IF THIS CONTINUES...IT COULD BE THE
BEGINNING OF A DRYING TREND THAT IS EXPECTED TO LAST INTO THU. THIS
WILL RESULT LESS CHANCES OF TSTMS DURING THE AFTERNOONS AND EVENINGS.

CONTINUED HOT TODAY...SIMILAR TO SUNDAY...THEN SLIGHTLY COOLER FOR
TUESDAY THROUGH THURSDAY AS THE HIGH PRESSURE RIDGE OVER SOCAL
WEAKENS SOMEWHAT. THE MARINE LAYER WILL REMAIN SHALLOW WITH THE LOW
CLOUDS AND FOG LIMITED TO THE SAN DIEGO COUNTY COASTAL AREAS DURING
THE EARLY MORNING HOURS.

FRIDAY THROUGH MONDAY...
TOWARD THE WEEKEND...THE HIGH PRESSURE RIDGE REBUILDS OVER THE
WESTERN STATES AND WILL LIKELY BRING WARMING INLAND AND A RETURN OF
MONSOONAL MOISTURE FOR INCREASED CHANCES OF AFTERNOON AND EARLY
EVENING THUNDERSTORMS IN THE MOUNTAINS AND DESERTS.

&&

.AVIATION...
131430Z...THROUGH 1800 UTC...BKN-SCT STRATUS OVER WATER/IMMEDIATE
COAST WITH BASES 700 FT MSL AND TOPS 1200 FT MSL.

BTWN 1800-0100 UTC...SCT-BKN CLOUDS BASES 10000 FT MSL AND SCT
TSTMS...MAINLY OVER MTNS...WITH TOPS TO FL420...STRONG
UPDRAFTS/DOWNDRAFTS...SMALL HAIL...VSBY BLO 2SM IN +SHRA...AND SFC
WIND GUSTS 50 KT.

BTWN 0100-1000 UTC...SCT-FEW CLDS AOA 15000 FT MSL.

AFTER 1000 UTC SCT-BKN STRATUS CLOUDS DEVELOPING OVER
WATER/IMMEDIATE COAST WITH BASES 700 FT MSL TOPS 1000 FT MSL...
KSAN AND KCRQ MAY HAVE CIGS AOB 800 FT BTWN 14/1200-1500 UTC.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...FLASH FLOOD WATCH FROM 10 AM PDT THIS MORNING THROUGH THIS
     EVENING FOR THE APPLE AND LUCERNE VALLEYS...COACHELLA
     VALLEY...RIVERSIDE COUNTY MOUNTAINS...SAN BERNARDINO COUNTY
     MOUNTAINS...SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE
     INLAND EMPIRE...SAN DIEGO COUNTY DESERTS...SAN DIEGO COUNTY
     MOUNTAINS.

     EXCESSIVE HEAT WARNING UNTIL 10 PM PDT THIS EVENING FOR THE
     COACHELLA VALLEY...SAN DIEGO COUNTY DESERTS.

PZ...NONE.

&&

PUBLIC...PG
AVIATION/MARINE...BALFOUR

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
410 AM PDT MON AUG 13 2012

CAZ042-043-048-050-055>058-060>062-140200-
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
410 AM PDT MON AUG 13 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF EXTREME
SOUTHWESTERN CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

CONTINUED HOT AND HUMID FOR INLAND AREAS WITH AN EXCESSIVE HEAT
WARNING FOR THE LOWER DESERTS THROUGH THIS EVENING.

MONSOONAL MOISTURE WILL BRING SCATTERED AFTERNOON AND EARLY EVENING
THUNDERSTORMS FOR THE MOUNTAINS...DESERTS...AND FAR INLAND
VALLEYS. FOR THE MOUNTAINS AND DESERTS...THE FLASH FLOOD POTENTIAL
INDEX IS MODERATE...THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE. FOR THE INLAND VALLEYS...THE
FLASH FLOOD POTENTIAL INDEX IS LOW...THE RISK OF FLASH FLOODING IS
MINIMAL. A FLASH FLOOD WATCH IS IN EFFECT FOR THE MOUNTAINS...
DESERTS...AND PORTIONS OF THE INLAND EMPIRE FOR LATE MORNING THROUGH
EARLY EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

FOR TUESDAY FOR THE MOUNTAINS AND DESERTS...THE FLASH FLOOD
POTENTIAL INDEX IS LOW. THE RISK OF FLASH FLOODING IS MINIMAL.

.SPOTTER INFORMATION STATEMENT...
SKYWARN ACTIVATION MAY BE NEED FOR THE MOUNTAINS...DESERTS...AND
INLAND EMPIRE FOR LATE MORNING THROUGH EARLY EVENING.

17

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1000 AM PDT MON AUG 13 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0220 PM     HAIL             WARNER SPRINGS          33.28N 116.63W
08/12/2012  M0.75 INCH       SAN DIEGO          CA   TRAINED SPOTTER

            MARBLE TO PENNY SIZED HAIL OBSERVED 2 TO 3 MILES EAST OF
            THE SAN FELIPE ROAD TURNOFF OF SR 79.

&&

TSTALL

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
1014 AM PDT MON AUG 13 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0211 PM     FLASH FLOOD      APPLE VALLEY            34.53N 117.21W
08/12/2012                   SAN BERNARDINO     CA   TRAINED SPOTTER

            THUNDERSTORM CAUSED FLASH FLOODING AND STREET FLOODING ON

            CENTRAL AND TUSSING ROADS. SMALL HAIL LESS THAN PEA SIZE.

0220 PM     TSTM WND GST     WARNER SPRINGS          33.28N 116.63W
08/12/2012  M58.00 MPH       SAN DIEGO          CA   TRAINED SPOTTER

            SDGE EAST WARNERS SENSOR RECORDED 58MPH GUST DURING TRW.

0220 PM     HAIL             WARNER SPRINGS          33.28N 116.63W
08/12/2012  M0.75 INCH       SAN DIEGO          CA   TRAINED SPOTTER

            MARBLE TO PENNY SIZED HAIL OBSERVED 2 TO 3 MILES EAST OF
            THE SAN FELIPE ROAD TURNOFF OF SR 79.

0232 PM     FLASH FLOOD      5 SW WARNER SPRINGS     33.23N 116.69W
08/12/2012                   SAN DIEGO          CA   LAW ENFORCEMENT

            ROAD CLOSURE ON SAN FELIPE RD WHICH IS S2. MILE MARKER 2
            AND 3--MUD AND WATER FLOW THAT IS 3FT. DEEP.

0352 PM     TSTM WND DMG     5 E PERRIS              33.79N 117.14W
08/12/2012                   RIVERSIDE          CA   LAW ENFORCEMENT

            MULTIPLE POWER POLES DOWN ACROSS THE RD. LANDED ON
            VEHICLES AND TRAPPED PASSENGERS IN VEHS. SEVERAL VEHICLES
            ARE ALSO STUCK BTWN THE LINES.

0401 PM     TSTM WND DMG     6 NE PERRIS             33.85N 117.15W
08/12/2012                   RIVERSIDE          CA   LAW ENFORCEMENT

            LIGHTNING HIT A POLE AND CAME DOWN ACROSS THE RD. HAZARD
            IS ON RAMONA EXPWY AND BERNASONI RD.

0415 PM     TSTM WND DMG     3 WSW PERRIS            33.77N 117.27W
08/12/2012                   RIVERSIDE          CA   NWS EMPLOYEE

            WEST SIDE OF PERRIS ON OLIVE AND ELLIS STREETS AND JUST
            NORTH CALIFORNIA HIGHWAY 74...SEVERAL SMALL AND LARGE
            TREE LIMBS DOWN. ON ELLIS STREET JUST NORTH OF CA ROUTE
            74...TWO POWER POLES WERE BROKEN BY WIND BUT REMAINED
            LEANING. ONE RURAL STREET IN THAT AREA WAS CLOSED DUE TO
            PONDING OF WATER AT LEAST 12 INCH. ESTIMATED WIND SPEED
            50 TO 55 MPH FOR THIS AREA ONLY.

&&

ATARDY

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1126 AM PDT MON AUG 13 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0400 PM     TORNADO          2 ESE PERRIS            33.78N 117.19W
08/12/2012                   RIVERSIDE          CA   PUBLIC

            PUBLIC VIDEO OF LANDSPOUT TORNADO ASSOCIATED WITH AND
            SOUTHWEST OF PARENT THUNDERSTORM THAT WAS OVER NUEVO.
            TORNADO APPEARED TO BE OVER FIELDS JUST EAST OR NEAR
            I-215 AND NON SUPERCELL TORNADO. SEPARATE WIND DAMAGE
            WITH THE PARENT THUNDERSTORM WAS OBSERVED TO THE
            NORTHEAST OVER NUEVO ON MENIFEE ROAD. TIME ESTIMATED. NO
            APPARANT DAMGE FROM TORNADO. EF0 RATING.

&&

ATARDY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1143 AM PDT MON AUG 13 2012

CAZ058-062-131930-
SAN DIEGO COUNTY DESERTS-
SAN DIEGO COUNTY MOUNTAINS-
1143 AM PDT MON AUG 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SAN DIEGO COUNTY
UNTIL 1230 PM PDT...

AT 1142 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 17 MILES SOUTHWEST OF OCOTILLO...MOVING NORTH
AT 10 MPH.

HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM.

AREAS AFFECTED BY THIS STORM INCLUDE...TIERRA DEL SOL...BOULEVARD AND
LIVE OAK SPRINGS.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3282 11644 3286 11615 3261 11614 3260 11620
      3261 11623 3260 11626 3259 11637
TIME...MOT...LOC 1843Z 171DEG 8KT 3262 11626

HARRISON