Periods of drizzle and light rain will continue across the area this morning. Most of this precipitation will be very light to light in intensity. Rain is expected to increase in coverage and intensity during the afternoon hours today and continue into early this evening before ending from West to East across the area by 8-9pm. Moderate to locally heavy downpours of rain are possible at times with some of the activity during the afternoon and/or early evening hours today. An isolated thunderstorm also cannot be ruled out during the afternoon or early evening hours.
Average additional rainfall of 1.0-1.5 inches can be expected across most of the area through 8-9pm today, with locally higher amounts possible in some spots.
Due to saturated ground conditions and continued higher than normal stream levels across much of the area, ponding of water and/or minor flooding is possible at times mainly this afternoon and/or evening in low lying areas such as low water crossings, etc. in some parts of the area. Areas that are most susceptible include locations that received heavier rainfall earlier this week, as well as areas where any moderate to heavier showers may recur at times during the afternoon and/or early evening hours today.
The Colorado and San Gabriel rivers and tributaries will need to be monitored for possible rises mainly this afternoon into tonight due to rainfall that occurs upstream during the day today.
As we work through the day today, we'll be able to identify any concentrated areas of enhanced rainfall (if any) on the upstream portions of these rivers which should make it easier to anticipate where rises may occur later on.
Please remember that larger rivers will continue rising well after the upstream rains end, as runoff flows downstream. Hence the reason we mention that these streams will need to be monitored into the nighttime hours tonight.
We will continue to monitor the situation and issue updates as conditions warrant.
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