Sunday, 12 August 2012

Tornado Warning for San Bernardino County, CA

San Bernardino

Tornado Warning

Issued at: 4:59 PM PDT on August 12, 2012, expires at: 5:08 PM PDT on August 12, 2012

...The Tornado Warning for west central Riverside County will expire at 500 PM PDT... Thunderstorms in the warned area...which produced a tornado...have dissipated. Therefore...the Tornado Warning for west central Riverside County will be allowed to expire at 500 PM PDT. Lat...Lon 3373 11744 3381 11728 3380 11724 3373 11719 3365 11731 3363 11737 time...Mot...loc 2358z 113deg 4kt 3378 11730 Jjt/jt

Areal Flood Advisory, Flash Flood Watch

Issued at: 4:01 PM PDT on August 12, 2012, expires at: 7:00 PM PDT on August 12, 2012

...The Urban and Small Stream Flood Advisory remains in effect until 515 PM PDT for southwestern San Bernardino County... At 344 PM PDT...scattered thunderstorms continue to develop over the apple and Lucerne valleys...especially near Johnson Valley. These storms are expected to produce heavy rain and street flooding. Precautionary/preparedness actions... Excessive runoff from heavy rainfall will cause elevated levels on small creeks and streams...and ponding of water in urban areas... highways...streets and underpasses as well as other poor drainage areas and low lying spots. Do not drive your vehicle into areas where the water covers the roadway. The water depth may be too great to allow your car to cross safely. Move to higher ground. Lat...Lon 3474 11642 3467 11650 3461 11650 3460 11647 3447 11640 3436 11640 3432 11647 3421 11643 3413 11648 3409 11660 3404 11661 3404 11698 3422 11739 3419 11748 3418 11768 3430 11765 3483 11767 918 am PDT sun Aug 12 2012 ...Flash Flood Watch in effect until 7 PM PDT this evening... The National Weather Service in San Diego has issued a * Flash Flood Watch for a portion of southwest California... including the following areas...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 and San Diego County mountains. * Until 7 PM PDT this evening. * Excessive runoff from heavy downpours may cause rapid filling and overflowing of normally dry washes...creeks...small streams...and low lying areas. In addition there is a threat of rock and mud slides below steep terrain in the mountains and recently burned areas. Precautionary/preparedness actions... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued.

Flash Flood Watch

Issued at: 9:33 am PDT on August 12, 2012, expires at: 7:00 PM PDT on August 12, 2012

...Flash Flood Watch in effect from noon today to 7 PM PDT this evening... The National Weather Service in Los Angeles/Oxnard has issued a * Flash Flood Watch for a portion of southwest California... including the following areas...Antelope Valley...Los Angeles County mountains excluding the Santa Monica range and Ventura County mountains. * From noon today to 7 PM PDT this evening * monsoon moisture combined with light upper level winds will bring the potential for slow moving thunderstorms capable of producing heavy rainfall and associated flash flooding. * Excessive runoff from heavy downpours may cause rapid filling and overflowing of normally dry washes and small creeks...and low lying areas. In addition...there is a threat of rock and mud slides below steep terrain in the mountains. Precautionary/preparedness actions... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued.

Special Statement

Issued at: 11:06 am PDT on August 12, 2012, expires at: 8:30 PM PDT on August 12, 2012

...Hot temperatures continue across inland portions of southwestern California today and Monday with slight cooling by midweek... A hot air mass remains in place over Southern California due to strong high pressure over the southwestern United States. Hot temperatures are expected to continue across interior sections today into Monday...where triple digit readings will be common. The warmest locations will be in the western San Fernando Valley...Santa Clarita valley...Ojai Valley and interior portions of San Luis Obispo and Santa Barbara counties where highs between 100 and 107 degrees are expected. Highs in the Antelope Valley should reach up to 108 degrees...while highs in the Lower Mountain elevations will be from the upper 90s to 105 degrees. Warmest Interior Valley and mountains could locally reach critical heat warning criteria today...especially across Los Angeles County where low level moisture is highest. Relief from the current heat wave will continue near the beaches...where highs will generally be in the 70s. However...interior portions of the coastal plain...including downtown Los Angeles...are expected to climb above 90 degrees. Another hot day is on tap for Monday...with gradual cooling trend expected by mid week. There will also be a chance of afternoon and evening thunderstorms today for the mountains...the Antelope Valley...the Cuyama Valley and the Carrizo Plain. The thunderstorm threat will diminish Monday with a slight chance of convection over the eastern portion of the l.A. Mountains and the Antelope Valley. Any thunderstorms that develop would be capable of producing brief heavy rain...gusty winds...dangerous cloud-to-ground lightning...and possibly small hail. Persons planning to be outdoors through Sunday should practice heat safety tips. Keep your body hydrated with plenty of water and avoid strenuous activity during the hottest part of the day. Gomberg/sirard/asr 450 am PDT sun Aug 12 2012 ...Hot temperatures again across inland portions of southwestern California today with slight cooling next week... A hot air mass remains in place over Southern California due to strong high pressure over the southwestern United States. Temperatures will only be fractionally cooler today...but it will be a little drier.Highs will still be well above 100 degrees across many inland areas. The warmest locations will be in the western San Fernando Valley...Santa Clarita valley...Ojai Valley and interior portions of San Luis Obispo and Santa Barbara counties where highs between 100 and 107 degrees are expected. Highs in the Antelope Valley should reach up to 108 degrees...while highs in the Lower Mountain elevations will be from the upper 90s to 103 degrees. The remainder of the valleys of Ventura and Los Angeles counties will top out between 90 and 102 degrees. Overnight low temperatures will also be warmer than usual...ranging from the mid to upper 60s in the valleys to the 70s to near 80 in the foothills and Antelope Valley. Temperatures will be cooler for coastal areas...although inland portions of the coastal plain should reach near 90 degrees. Beaches will be much cooler...mostly in the 70s. On Monday a very slight cooling trend will start but both maximum and minimum temperatures away from the coast will remain above normal through Thursday. There will also be a slight chance of afternoon and evening thunderstorms today for the mountains...the Antelope Valley...the Cuyama Valley and the Carrizo Plain. The thunderstorm threat will diminish Monday with a slight chance of convection over the eastern portion of the l.A. Mountains and the Antelope Valley. Any thunderstorms that develop would be capable of producing brief heavy rain...gusty winds...dangerous cloud-to-ground lightning...and possibly small hail. Persons planning to be outdoors through Sunday should practice heat safety tips. Keep your body hydrated with plenty of water and avoid strenuous activity during the hottest part of the day.


 

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