October 19, 2017 Excessive Heat Watch - Los Angeles County San Gabriel Valley (California)
Temp
 
71.8 °F
 
Dew Pt.
 
61.1 °F
 
Humidity
 
69%
 
Pressure
 
1010.0 hPa 
  steady
Wind
 
0.0 mph 
    W
Rain
 
0.00 in 
  0.00 in/hr
UV index
 
---  
 
Solar rad.
 
100 W/m²
 
Tonight

Tonight: Patchy drizzle and fog after midnight.  Mostly cloudy, with a low around 63. Southwest wind 5 to 10 mph becoming south southeast after midnight.
Partly Cloudy
then Patchy
Drizzle and
Patchy Fog
Friday

Friday: Patchy drizzle and fog before noon.  Partly sunny, with a high near 74. South wind 5 to 10 mph.
Patchy
Drizzle and
Patchy Fog
then Mostly
Sunny
Lo 63 °F Hi 74 °F

Current Watches, Warnings and Advisories for Los Angeles County San Gabriel Valley (CAZ548) California

 

Excessive Heat Watch Excessive Heat Watch - Los Angeles County San Gabriel Valley (California)


Updated:Thu 19-Oct-17 02:29pm PDT
Effective:Wed 31-Dec-69 04:00pm PST
Expires:Wed 31-Dec-69 04:00pm PST
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Instructions: Never, ever, leave people or pets in enclosed vehicles, even for a short period of time. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency - call 911.

Message summary: ...gusty sundowner winds expected tonight in southern santa barbara county...
...excessive heat watch in effect for los angeles and ventura county coast and valleys and the santa barbara county south coast monday and tuesday...
.gusty sundowner winds are expected again tonight in southern santa barbara county. Winds will diminish later tonight but then they are expected to increase again friday evening into early saturday morning. Early next week, strong high pressure and a weak to moderate santa ana wind event will produce record setting hot temperatures across southwest california. The hottest days are expected to be monday and tuesday where highs near or in excess of 100 degrees are expected across much of the coast and valley region of los angeles and ventura counties, including the santa monica mountains, as well as the south coast of santa barbara county. Overnight temperatures will also be quite warm, especially in the foothills and santa monica mountains where temperatures will only drop to the mid to upper 70s and possibly lower 80s.
...excessive heat watch in effect from monday morning through tuesday evening...
The national weather service in los angeles/oxnard has issued an excessive heat watch, which is in effect from monday morning through tuesday evening.
* temperatures...100-106 degrees, warmest on tuesday. Overnight lows in the upper 60s and 70s. Isolated lower 80s possible in the foothills and mountains.
* impacts...the very high temperatures create a dangerous situation in which heat illnesses are possible. Temperatures inside vehicles, even if the windows are partially open, can quickly rise to life-threatening levels.
...view the complete message
 

Fire Weather Watch Fire Weather Watch - Los Angeles County San Gabriel Valley (California)


Updated:Thu 19-Oct-17 01:27pm PDT
Effective:Wed 31-Dec-69 04:00pm PST
Expires:Wed 31-Dec-69 04:00pm PST
Severity:
Urgency:
Certainty:
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Instructions: A fire weather watch means that critical fire weather conditions are possible. Listen for later forecasts and possible red flag warnings. Use extreme caution when using potential fire ignition sources.

Message summary: ...critical fire weather conditions possible saturday through tuesday for portions of southwest california...
.gusty northwest to north winds will increase across much of southwest california friday into friday night following the passage of an upper level trough. While there will be elevated fire danger due to these gusty winds, humidities are not expected to be sufficiently low to reach critical conditions. However, on saturday, gusty northerly winds combined with lowering humidities will bring the potential for critical fire weather conditions to the mountains. As the flow turns more northeast sunday through tuesday, there will be a significant warming and drying trend across all of southwest california, with the potential for critical fire weather conditions extending into the valleys. The most critical fire weather conditions appear to be monday through tuesday, when there will be a combination of santa ana winds gusting to between 35 and 50 mph, record breaking triple digit heat, humidities lowering into the single digits, and very dry fuels. In addition, very warm and dry conditions during the overnight hours in the mountains, foothills, and wind prone areas will add to this fire weather threat during this long duration of dangerous fire weather conditions. Coastal areas of los angeles and ventura counties will potentially need to be included in the watch area for monday or tuesday as we draw closer to the event.
...fire weather watch in effect from sunday morning through tuesday afternoon for gusty northeast winds and low relative humidity for the foothills of the san gabriel valley...
The national weather service in los angeles/oxnard has issued a fire weather watch for gusty northeast winds and low relative humidity...which is in effect from sunday morning through tuesday afternoon.
* winds...northeast winds 10 to 20 mph with gusts to 30 mph in the foothills on sunday, increasing to 15 to 25 mph with gusts to 35 mph on sunday and monday.
* relative humidity...minimum values 8 to 15 percent on sunday, lowering to 6 to 12 percent monday and tuesday.
* temperatures....max temperatures 90 to 95 degrees on sunday, rising to between 100 and 105 degrees monday into tuesday. Very warm overnight low temperatures in the foothills and wind prone areas...remaining 75 to 80 degrees in warmest locations.
* impacts...if fire ignition occurs, there will be the potential for rapid spread of wildfire and extreme fire behavior that could lead to a threat to life and property.
...view the complete message

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Source: NWS Watches, Warnings or Advisories for zone CAZ548