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Ontario, California
National Weather Service:
Flash Flood Warning , Special Weather Statement

Current conditions
Temp: 68° Dew Point: 45°
Humidity: 43% Wind: SSW 13 mph
Visibility: 10.0 miles Pressure: 29.47 in. +
Sky: Mostly Cloudy
Next 12 Hours

1  pm
4  pm
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10  pm
1  am

Chance of a Thunderstorm
Chance of a Thunderstorm
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Chance of a Thunderstorm
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Chance of a Thunderstorm
Chance of a Thunderstorm

65°
65°
59°
56°
54°
Forecast data from the National Digital Forecast Database
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5-Day Forecast
Thursday
Chance of a Thunderstorm Hi 65°
Lo 54°
Chance of T-storms 		Friday
Chance of a Thunderstorm Hi 63°
Lo 54°
Chance of T-storms 		Saturday
Chance of a Thunderstorm Hi 67°
Lo 54°
Chance of T-storms 		Sunday
Partly Cloudy Hi 72°
Lo 56°
Partly Cloudy
 Monday
Partly Cloudy Hi 76°
Lo 56°
Partly Cloudy
Local Radar
Local Radar
Local Satellite
Local Satellite
Nowcast as of 11:45 am PDT on May 22, 2008
Now
Scattered showers and thunderstorms will move south at 10 to 15 mph through 2 PM. As of 1130 am...the strongest storms were over the 215 freeway north of Murrieta moving toward Temecula. These storms have a history of producing hail up to one half inch in diameter and heavy rain. All thunderstorms this afternoon will be capable of producing brief heavy rain...small hail...dangerous lightning...and gusty winds. Precipitation amounts will generally range from a trace in most areas up to one quarter of an inch with thunderstorms.
Forecast for San Bernardino and Riverside County Valleys -The Inland Empire
Updated: 11:46 am PDT on May 22, 2008
Rest of Today
Partly cloudy with a slight chance of showers and thunderstorms. Highs 59 to 65. Winds west 15 mph. Gusts to 25 mph in the afternoon. Chance of measurable precipitation 20 percent.
Tonight
Mostly cloudy with a chance of showers and thunderstorms. Lows 48 to 54. Winds west 15 mph with gusts to 25 mph in the evening becoming light. Chance of measurable precipitation 40 percent.
Friday
Mostly cloudy with a chance of showers and thunderstorms. Highs 60 to 66. Light winds. Chance of measurable precipitation 40 percent.
Friday Night
Mostly cloudy with a chance of showers and thunderstorms. Lows 48 to 54. Winds southwest 15 mph in the evening becoming light. Chance of measurable precipitation 50 percent.
Saturday
Mostly cloudy in the morning...becoming partly cloudy. Chance of showers and thunderstorms. Highs 62 to 69. Light winds becoming southwest 15 mph in the afternoon. Chance of measurable precipitation 40 percent.
Saturday Night
Partly cloudy with a chance of showers and thunderstorms in the evening...then mostly cloudy with a slight chance of showers after midnight. Lows 50 to 55.
Sunday
Partly cloudy. Slight chance of showers in the morning. Warmer. Highs 66 to 76.
Sunday Night
Partly cloudy in the evening...becoming mostly cloudy. Patchy fog after midnight. Lows 49 to 56.
Memorial Day
Mostly cloudy in the morning...becoming mostly sunny. Patchy fog in the morning. Highs 69 to 77.
Monday Night
Mostly clear in the evening...becoming mostly cloudy. Patchy fog after midnight. Lows 50 to 57.
Tuesday
Mostly cloudy in the morning...becoming mostly sunny. Patchy fog in the morning. Highs 75 to 81.
Tuesday Night
Mostly clear in the evening...becoming cloudy. Patchy fog after midnight. Lows 52 to 58.
Wednesday
Cloudy in the morning...becoming mostly sunny. Patchy fog in the morning. Highs 78 to 84.
Sun and Moon
Sunrise:05:44 AM (PDT) Moon Rise:10:36 PM (PDT)
Sunset:07:50 PM (PDT) Moon Set:07:22 AM (PDT)
 
Moon Phase
Today May. 27 Jun. 03 Jun. 10 Jun. 18
Air Pollution
Air Pollution Forecast for San Bernardino Co. Metro
Current Air Quality: Moderate Pollutant: PM2.5
Current Air Quality: Good Pollutant: OZONE
Thu Air Quality: Good Pollutant: OZONE
Fri Air Quality: Moderate Pollutant: OZONE
Personal Weather Stations
Personal Weather Stations [Add your weather station!]
Location: Chino, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
75.0 °F 46 °F 35% Calm 28.61 in 0.00 in 77 °F
Location: APRSWXNET Chino Hills CA US, Chino Hills, CA Historical Graphs Updated: 12:43 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
65 °F 47 °F 52% WSW at 9 mph 29.48 in 0.00 in -
Location: Flintridge, Chino Hills, CA Historical Graphs Updated: 1:08 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
74.1 °F 25 °F 16% NNW at 8.0 mph 28.49 in 0.00 in 75 °F
Location: Los Serranos Ranch, Chino Hills, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
67.5 °F 46 °F 47% Calm 29.54 in 0.00 in -
Location: Village Oaks, Chino Hills, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
68.4 °F 46 °F 44% SSE at 8.1 mph 28.44 in 0.00 in -
Location: APRSWXNET Ontario CA US, Montclair, CA Historical Graphs Updated: 12:38 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
70 °F 48 °F 45% SSW at 1 mph 29.42 in 0.00 in -
Location: Pomona Historic Lincoln Park, Pomona, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
65.7 °F 46 °F 49% SSE at 5.0 mph 29.46 in 0.00 in -
Location: Hilltop in Carbon Canyon, Chino Hills, CA Historical Graphs Updated: 1:11 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
59.3 °F 57 °F 91% WNW at 2.0 mph 29.40 in 0.00 in -
Location: MesoWest Upland CA US CARB, Upland, CA Historical Graphs Updated: 12:00 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
62 °F 51 °F 66% SE at 6 mph - 0.00 in -
Location: Providence Ranch, Corona, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
68.4 °F 42 °F 38% SW at 6.3 mph 28.85 in 0.00 in -
Location: La Verne - Near Bonita and "I" St., La Verne, CA Historical Graphs Updated: 1:10 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
65.1 °F 48 °F 53% SE at 2.0 mph 29.38 in 0.00 in -
Location: La Verne - near 3rd & White, La Verne, CA Historical Graphs Updated: 1:08 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
69.8 °F 49 °F 47% ESE at 2.0 mph 29.44 in 0.00 in -
Location: RAWS CLAREMONT CA US, Claremont, CA Historical Graphs Updated: 12:40 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
69 °F 45 °F 42% SW at 3 mph 29.49 in 0.00 in -
Location: APRSWXNET Mira Loma CA US, Mira Loma, CA Historical Graphs Updated: 12:45 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
72 °F 51 °F 47% NNW at 1 mph 28.71 in 0.00 in 77 °F
Location: RAWS TONNER CANYON CA US, Brea, CA Historical Graphs Updated: 12:31 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
54 °F 47 °F 76% ESE at 13 mph 29.44 in 0.00 in -
Location: La Verne, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
69.6 °F 41 °F 35% SSE at 5.8 mph 29.47 in 0.00 in -
Location: 23rd and Mountain / Mallorca Homes, Upland, CA Historical Graphs Updated: 10:35 AM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
64.1 °F 52 °F 64% Calm 29.31 in 0.02 in -
Location: MesoWest Mira Loma CA US CARB, Mira Loma, CA Historical Graphs Updated: 12:00 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
59 °F 54 °F 84% Calm - 0.00 in -
Location: Horse Town USA, Norco, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
74.7 °F 41 °F 30% WSW at 10.1 mph 28.76 in 0.00 in 77 °F
Location: 210 Freeway, Alta Loma, CA Historical Graphs Updated: 1:09 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
68.5 °F 40 °F 35% South at 3.0 mph 29.41 in 0.00 in -
Location: Bryant Ranch - 91/241 Fwy, Yorba Linda, CA Historical Graphs Updated: 1:09 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
56.3 °F 51 °F 83% Calm 29.48 in - -
Location: Sky Country, Mira Loma, CA Historical Graphs Updated: 1:10 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
75.3 °F 51 °F 42% NW at 6.8 mph 28.69 in 0.00 in 78 °F
Location: APRSWXNET Alta Loma CA US, Alta Loma, CA Historical Graphs Updated: 12:33 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
64 °F 45 °F 50% WSW at 2 mph 29.44 in 0.00 in -
Location: Milliken/Mountain View, Rancho Cucamonga, CA Historical Graphs Updated: 1:08 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
65.7 °F 44 °F 46% SW at 3.0 mph 28.17 in 0.00 in -
Location: APRSWXNET Yorba Linda CA US, Yorba Linda, CA Historical Graphs Updated: 12:49 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
55 °F 50 °F 84% Calm 29.48 in 0.00 in -
Location: Glen Oak Adjacent, Charter Oak, CA Historical Graphs Updated: 1:11 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
69.4 °F 45 °F 42% South at 6.0 mph 28.67 in 0.00 in -
Location: _Top of Saphire in..., Alta Loma, CA Historical Graphs Updated: 1:08 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
60.9 °F 45 °F 55% NE at 1.0 mph 29.42 in 0.00 in -
Location: Yorba Linda, CA Historical Graphs Updated: 12:58 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
58.8 °F 47 °F 65% Calm 29.50 in 0.31 in -
Location: Downtown, Yorba Linda, CA Historical Graphs Updated: 1:10 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
54.8 °F 51 °F 87% SW at 4.0 mph 29.46 in 0.29 in -
Location: Victoria Gardens/Etiwanda, Rancho Cucamonga, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
66.4 °F 39 °F 36% WSW at 2.0 mph 29.56 in 0.00 in -
Location: South Glendora, Glendora, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
69.1 °F 50 °F 50% SSW at 8.0 mph 29.42 in 0.00 in -
Location: Norco Hills, Norco, CA Historical Graphs Updated: 1:10 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
64.9 °F - 51% Calm 28.97 in 0.00 in -
Location: La Sierra, Riverside, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
72.0 °F 38 °F 29% South at 5.8 mph 17.72 in 0.00 in 76 °F
Location: SW Yorba Linda/NW Anaheim Hills, Yorba Linda, CA Historical Graphs Updated: 1:12 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
57.7 °F 57 °F 96% WNW at 2.7 mph 29.46 in 0.00 in -
Location: RAWS CORONA CA US, Corona, CA Historical Graphs Updated: 12:11 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
62 °F 49 °F 62% NE at 1 mph - 0.00 in -
Location: MesoWest Fontana-Arrow Highway CA US CARB, Fontana, CA Historical Graphs Updated: 12:00 PM PDT
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation Heat Index
61 °F 51 °F 70% WNW at 5 mph - 0.00 in -
MSN Maps of:
Temperature Dew Point Humidity Wind Pressure Hourly Precipitation
 Flash Flood Warning 
Statement as of 1:04 PM PDT on May 22, 2008


... A Flash Flood Warning remains in effect until 200 PM PDT for
Orange and extreme southwestern Riverside counties...

At 1258 PM PDT... local law enforcement officials reported multiple
flash floods along Live Oak Canyon Road and in Modjeska Canyon.

Locations in the warning include but are not limited to Rancho Santa
Margarita and Trabuco Canyon.

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.

Do not underestimate the power of flood waters. Only a few inches of
rapidly flowing water can quickly carry away your vehicle.

Lat... Lon 3394 11779 3383 11765 3359 11748 3352 11751
      3347 11755 3357 11771 3368 11783 3387 11796
      3393 11795
time... Mot... loc 2004z 180deg 0kt 3391 11787 3376 11771
          3362 11760


Scv



 Special Weather Statement 
Statement as of 9:15 am PDT on May 22, 2008


... Cool and unsettled weather through Memorial Day weekend...

A developing low pressure system will bring cool and unsettled
weather with a chance of showers and thunderstorms today through
Sunday. The best chance for showers and thunderstorms will be over
the mountains. People with outdoor activities should expect periods
of showers or thunderstorms during the Holiday weekend.
Thunderstorms contain deadly lightning and may produce brief heavy
rain... gusty winds... and small hail. Snow is possible above 7000
feet in the san gorgonio wilderness and on mount San Jacinto.
Rainfall amounts will be highly variable due to the showery nature
of the precipitation.

The weather will be considerably cooler than last week with high
temperatures running 10 to 20 degrees below seasonal averages.
Interested parties should stay informed on the latest forecast.

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