Alert archive / California / Flash Flood Warnings in 2010

Flash Flood Warning 12, NWS San Diego, CA

July 15, 2010San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Jul 15, 2010, 6:09 PM PDT for San Bernardino County, California. It was in force for 111 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 15, 2010, 6:09 PM PDT (01:09 UTC)
Expired: Jul 15, 2010, 8:00 PM PDT
In force: 111 min
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Flood severity: None

County San Bernardino County, CA

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Diego, CA wrote its last area forecast discussion before this flash flood warning went out at Jul 15, 2:30 PM PDT, 3 hours 39 minutes earlier.

Area forecast discussion, Jul 15, 2:30 PM PDT, 3 hours 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 PM PDT THU JUL 15 2010

.SYNOPSIS...STRONG HIGH PRESSURE ALOFT WILL BRING HOT DAYS INLAND
THROUGH THE WEEKEND. SCATTERED THUNDERSTORMS OVER THE MOUNTAINS AND
DESERTS INTO THIS EVENING...WITH A FEW STORMS POSSIBLY DRIFTING INTO
THE INLAND VALLEYS OR SAN DIEGO COASTAL AREAS. ONLY A FEW
THUNDERSTORMS ARE EXPECTED OVER AND NEAR THE MOUNTAINS FRIDAY
THROUGH SUNDAY AS MID LEVEL MOISTURE DECREASES. AN UPPER LEVEL
TROUGH OF LOW PRESSURE WILL BRING COOLING AND THE RETURN OF THE
MARINE LAYER CLOUDS TO COASTAL AREAS NEXT WEEK.

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

.SHORT TERM (REMAINDER OF TODAY-SUNDAY)...CU WITH ISOLATED
THUNDERSTORMS DEVELOPED OVER THE MOUNTAINS THIS AFTERNOON. AIRCRAFT
SOUNDINGS SHOWING ELY WINDS 15 TO 20 KT NEAR 10000 FT. WEAK OFFSHORE
GRADIENTS FROM THE N AND ONSHORE TO THE E WITH ABOUT 4 MB SAN-IPL.

THE STRONG UPPER HIGH WILL CONTINUE TO BUILD AND MOVE IN FROM THE E
TROUGH SATURDAY AND THEN WEAKEN A LITTLE SUNDAY AS A TROUGH
APPROACHES FROM THE NW. THIS WILL BRING HOT WEATHER...ESPECIALLY
INLAND. MAX TEMPS WILL BE ABOUT 5 TO 10 DEGREES ABOVE SEASONAL
AVERAGES THROUGH SATURDAY. MID LEVEL CLOUDS MAY LOCALLY TAKE A
COUPLE DEGREES OFF THE HIGHS TODAY BUT HUMIDITY WILL MAKE IT FEEL
JUST AS HOT. IT WILL BE CLOSE TO HEAT WARNING CRITERIA IN THE LOW
DESERTS BUT WILL LIKELY NOT QUITE GET HEAT INDICES OF 115 DURING THE
DAY AND 90 AT NIGHTS OVER A WIDESPREAD AREA FOR 3 HOURS OR MORE. A
LITTLE COOLER IN MOST AREAS SUNDAY...MAINLY MAINLY NEAR THE COAST.
HOWEVER...IT WILL STILL BE HOT INLAND SUNDAY. LITTLE OR NOT STRATUS
IS EXPECTED THROUGH SATURDAY. A SHALLOW MARINE LAYER MAY REDEVELOP
BY LATE SATURDAY NIGHT AND SUNDAY MORNING WITH AREAS OF LOW CLOUDS
AND FOG NEAR THE COAST. FOG MAY BE LOCALLY DENSE WHEN THE MARINE
CLOUDS RETURN.

A WEAK ELY WAVE WILL BRING MORE MID LEVEL MOISTURE TODAY RESULTING
IN MORE WIDESPREAD SHOWERS AND THUNDERSTORMS. THE BEST CHANCE OF
THUNDERSTORMS WILL BE IN THE MOUNTAINS AND ADJACENT DESERTS BUT A
FEW STORMS COULD DRIFT OVER THE INLAND VALLEYS AND POSSIBLY ALL THE
WAY TO THE SAN DIEGO COAST. FLASH FLOODING WILL BE THE MAIN THREAT
TODAY IN THE MOUNTAINS AND DESERTS BUT THE RISK IS NOT HIGH ENOUGH
FOR A FLASH FLOOD WATCH. A STORM COULD BRIEFLY GO SEVERE AS WELL.
THERE WILL BE LESS MID LEVEL MOISTURE WILL FRIDAY THROUGH SUNDAY
WHICH WILL MOSTLY CONFINE ANY CHANCE OF THUNDERSTORMS TO THE
MOUNTAINS AND LOCALLY INTO THE DESERTS.

&&

.LONG TERM (MONDAY-THURSDAY)...UPPER TROUGHING WILL BRING DRIER SW
FLOW ALOFT...COOLING AND STRONGER ONSHORE FLOW. THERE COULD STILL BE
ENOUGH RESIDUAL MID LEVEL MOISTURE FOR AFTERNOON CU OVER THE
MOUNTAINS MONDAY. THE MARINE LAYER WILL DEEPEN WITH LOW CLOUDS AND
FOG IN THE COASTAL AREAS AND WRN SAN DIEGO INLAND VALLEYS DURING THE
NIGHTS AND MORNINGS.

&&

.AVIATION...
152030Z...NO LOW CLOUDS EXPECTED THROUGH FRIDAY. ALOFT...AN EASTERLY
WAVE AND ASSOCIATED SHOWERS AND THUNDERSTORMS WILL MOVE OVER THE
AREA WITH A CHANCE OF SHOWERS AND THUNDERSTORMS INLAND VALLEYS
EASTWARD...AND A SLIGHT CHANCE OF THUNDERSTORMS REACHING THE
SOUTHERN CALIFORNIA COASTAL AIRPORTS THROUGH THIS EVENING.
THUNDERSTORM BASES AROUND 8000-10000 FEET MSL WITH TOPS TO AROUND
35000 FEET MSL. LOCALLY GUSTY WINDS NEAR THUNDERSTORMS. LESS
MOISTURE FRIDAY WITH A LOWER POTENTIAL FOR THUNDERSTORMS. SMALL

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

SPECIAL WEATHER STATEMENT FOR THE HEAT. SEE LAXSPSSGX.

&&

PUBLIC...ATKIN
AVIATION...SMALL

Hazardous weather outlook, Jul 15, 4:45 PM PDT, 1 hour 24 minutes before

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In the hours before

Special weather statement, Jul 15, 12:28 PM PDT, 5 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1228 PM PDT THU JUL 15 2010

CAZ050-058-152030-
SAN DIEGO COUNTY VALLEYS CA-
SAN DIEGO COUNTY MOUNTAINS CA-
1228 PM PDT THU JUL 15 2010

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SAN DIEGO COUNTY UNTIL
130 PM PDT...

AT 1227 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 24 MILES SOUTHEAST OF TECATE...MOVING NORTH AT
15 MPH.

AREAS AFFECTED BY THIS STORM INCLUDE...LA MESA...MOUNT LAGUNA...PINE
VALLEY...ALPINE...RANCHO SAN DIEGO...TIERRA DEL SOL...LIVE OAK
SPRINGS...BOULEVARD...CAMPO...MORENA VILLAGE...POTRERO...TECATE...
DESCANSO...DULZURA...CUYAMACA PEAK...HARBISON CANYON...JAMUL...
GRANITE HILLS AND CASA DE ORO-MOUNT HELIX.

THE STORM HAS A POTENTIAL FOR HAIL UP TO PENNY SIZE AND BRIEF GUSTY
WINDS TO 40 MPH. ALSO FIRE STARTS ARE POSSIBLE WHERE LIGHTNING
STRIKES OUTSIDE THE RAIN CORE.

LAT...LON 3276 11704 3301 11648 3261 11621 3260 11622
      3256 11676
TIME...MOT...LOC 1924Z 163DEG 13KT 3240 11627

PURPURA

Special weather statement, Jul 15, 2:34 PM PDT, 3 hours 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
234 PM PDT THU JUL 15 2010

CAZ061-152230-
RIVERSIDE COUNTY MOUNTAINS CA-
234 PM PDT THU JUL 15 2010

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN RIVERSIDE COUNTY UNTIL
330 PM PDT...

AT 226 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
AN AREA OF STRONG THUNDERSTORM IN THE SAN JACINTO MOUNTAINS IN TEH
IDYLLWILD- PINE COVE AREA OR 14 MILES SOUTHWEST OF PALM SPRINGS.
THE STORMS WERE NEARLY STATIONARY.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THESE STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING. LIGHTNING OUTSIDE THE RAIN CORE MAY PRODUCE
ISOLATED FIRE STARTS.

AREAS AFFECTED BY THIS STORM INCLUDE...PALM SPRINGS...ANZA AND LAKE
HEMET.

LAT...LON 3380 11644 3350 11658 3359 11691 3391 11674
TIME...MOT...LOC 2131Z 300DEG 1KT 3372 11674

PURPURA

Special weather statement, Jul 15, 2:35 PM PDT, 3 hours 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
235 PM PDT THU JUL 15 2010

CAZ061-152230-
RIVERSIDE COUNTY MOUNTAINS CA-
235 PM PDT THU JUL 15 2010

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN RIVERSIDE COUNTY UNTIL
330 PM PDT...

AT 226 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
AN AREA OF STRONG THUNDERSTORM IN THE SAN JACINTO MOUNTAINS IN THE
IDYLLWILD- PINE COVE AREA OR 14 MILES SOUTHWEST OF PALM SPRINGS.
THE STORMS WERE NEARLY STATIONARY.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THESE STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING. LIGHTNING OUTSIDE THE RAIN CORE MAY PRODUCE
ISOLATED FIRE STARTS.

AREAS AFFECTED BY THIS STORM INCLUDE...PALM SPRINGS...ANZA AND LAKE
HEMET.

LAT...LON 3380 11644 3350 11658 3359 11691 3391 11674
TIME...MOT...LOC 2131Z 300DEG 1KT 3372 11674

PURPURA

Nearby

Flash Flood Warnings in California, 2010 Every flash flood warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.