Saturday, Sept 30, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
This morning we have clear skies and very nice weather across the Mountain. Overnight, the North East flow aloft that has brought warm temperatures and gusty winds to the area has moved East. Today, a South West flow at the surface level will bring cooler temperatures, and gusty SW winds to most of SoCal today. Along with the SW flow, the Coastal areas will see an increase in the Marine layer aided by a Catalina Eddy. Tomorrow and Monday, fog and low clouds will push further inland with the help of the Coastal Eddy, all the way into the Inland Valleys and Coastal slopes of the Mountains. Temperatures today for the Lake Arrowhead and Crestline areas will be cooler with daytime highs in the upper 60s to low 70s. Overnight lows will cool to the mid 40s for most areas. Big Bear and Running Springs will have daytime highs in the mid to upper 60s as well, with overnight lows in the mid 30s for Big Bear, and the low 40s for Running Springs. A cooling trend will continue through Wednesday of next week for the start October, with very seasonable weather. October can have very warm daytime temperatures however, very cool nights are also associated with October, as well. Santa Ana winds will typically peak during October along with the Fire Danger levels. Fall colors will peak this month locally, making for a good time to get outdoors and enjoy the beauty of Fall in the Mountains. On the long range outlook a warming trend will begin mid week next week with a return of NE winds. For the first look at the Winter Forecast, I have posted some thoughts on the “Alerts and Trends” page.
That’s it for today. Enjoy the nice Mountain Weather. Thank you for joining me at www.lakegregoryweather.com If you would like to help to support this local weather website, there is a DONATE button on the top of each page that will take you to another page where your donation can be made. Thank you, RC @ lakegregoryweather.com

Friday, Sept 29, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Today’s weather outlook for the Crestline, Lake Arrowhead, Running Springs, and Big Bear areas.
For today, we will have warm temperatures around the area, with subtle changes on the way. High temperatures today will be in the mid to upper 70s again for the Lake Arrowhead and Crestline areas. Deer Lodge Park, Dart Canyon, and the North side of Arrowhead may reach into the low 80* range today. Big Bear and Running Springs will be a little cooler with highs in the upper 60s to low 70s. Last night in Big Bear the overnight low was 28* at Shay Meadows. Brrr! Today should be the warmest day of the next five as an area of low pressure will develop along the West Coast. The area of High pressure that has brought us a North East flow for the last several days will move out of the Great Basin to the North East. It will be replaced by a trough of low pressure that will bring cooler weather, and the return of a South West flow to SoCal. Coastal Fog and low clouds will develop along the Coastal areas spreading Inland on Sunday and Monday. Mostly clear skies and gusty SW winds will the forecast for the next few days with cooler temperatures. On the long range outlook, no rain is in the five to seven day outlook for SoCal. A warming trend will likely develop toward the end of next week as High pressure redevelops to our south. That’s it for today. Enjoy the nice Mountain Weather. Thank you for joining me at www.lakegregoryweather.com If you would like to help to support this local weather website, there is a DONATE button on the top of each page that will take you to another page where your donation can be made. Thank you, RC @ lakegregoryweather.com

Thursday, Sept 28, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Today’s weather picture will be much the same as the last few days. Highs today will be in the mid 70s for Crestline and Lake Arrowhead with overnight lows in the upper 40s to low 50s. Big Bear and Running Springs will have daytime highs in the upper 60s to low 70s, and overnight lows in the low to mid 30s for Big Bear and mid to upper 40s for Running Springs. Clear skies across all of the Mountain areas with North East winds from 5-15mph. For the Valley, temperatures will remain very warm with highs in the low to mid 90s today and Friday. Overnight lows will be in the low to mid 60s. This weather pattern will remain in place through Sunday. After Sunday, a cooling trend will begin as a trough of low pressure will make it’s way toward the Coast of SoCal. For next week, cooler temperatures and an increase in the Marine layer will bring normal Fall weather back to the area through the work week. There will be a slight chance for rain next Wednesday as it looks at this time. Have a good day and enjoy the nice Mountain Weather. RC

Wednesday, Sept 27, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Today we will see slightly warmer temperatures across the area. A Cut Off Low is now centered over Arizona, and will lift out to the North East later today. High Pressure over the Great Basin will remain in place for a couple more days continuing the North East flow across the area. Temperatures will peak by Friday, then begin cooling through the weekend and into early next week as West Coast Troughing will bring a return of a South West flow and Coastal fog to SoCal. High Temperatures today will be in the mid 70s for the Crestline and Lake Arrowhead areas. Running Springs and Big Bear will be a little cooler with highs in the mid to upper 60s. Overnight Lows will be in the upper 40s to low 50s except Big Bear where temperatures will be in the 30s. Clear skies and gusty afternoon North East winds will continue through Friday afternoon before returning to a South West flow. The Valley will have daytime High temperatures in the upper 80s to low 90s through Friday with gusty NE winds and low humidity levels in the afternoon. Have a good day. RC

Tuesday, Sept 26, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Not much change in the Forecast for today. Temperatures will be a couple of degrees warmer than yesterday and we will continue to see gusty North East winds for most locations. Currently at the most wind prone location, Playground Drive WX/Station, winds are from the North at 18mph. Yesterday at this time the winds were at 31mph. So things have settled down some this morning. Temperatures today For the Crestline and Arrowhead areas will be in the upper 60s and maybe a few areas on the North side of Arrowhead into the low 70s. Humidity levels will again dip into the teens this afternoon for a brief period raising concerns for the local Fire Danger levels. However, overnight recovery of the humidity levels will be pretty good. Clear skies except for some high level clouds will be all we see today. Offshore flow will relax each day through Friday as the area of High pressure over the Great Basin moves out later in the week. A couple of low pressure troughs will move across the Northern part of the State returning SoCal to a more typical South West flow along with Coastal low clouds and fog possibly by Thursday night and Friday morning for some areas. A Coastal Eddy may develop later today which will help to hasten the change to onshore flow along the Coastal areas and the return of coastal low clouds and fog to those areas. For the rest of the week ahead, temperatures will be in the low to mid 70s for Crestline and Lake Arrowhead. Big Bear and Running Springs will be a little cooler with highs in the mid 60s. Overnight lows will run in the upper 40s for the local area and in the mid 30 to low 40s for Big Bear and Running Springs. No rain is in the five day outlook. Have a good day. RC

Monday, Sept 25, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Surface pressure over the Great Basin is running at 1017mb, and 1010mb @ San Diego. About the same as yesterday at this time. The humidity levels locally are lower this morning than 24hours ago, running around 30% as opposed to yesterday at this time when they were in the upper 50 to 60% range. The winds have picked up over yesterday and are running from 5-15mph from the NE. Playground W/S has winds gusting to 31mph this morning. Clear skies for the next several days as we will continue to be under a NE flow. Gusty North East winds will be the forecast through Wednesday. A Cut Off Low will develop over the Colorado River area around Wednesday. The only affect here will be a reinforcement of the NE flow. There may be some warm air advection from the Cut Off Low Thursday through the weekend to bring local temperatures up into the low to mid 70s. I don’t see any chance of wrap around moisture from the Cut Off Low for the weekend as the Monsoonal flow is nowhere to be found. So gusty winds and slowly warming temperatures through the week will be the forecast as it looks this morning. Temperatures today for the Crestline and Arrowhead areas will be in the upper 60s to low 70s with overnight lows in the mid to upper 40s. Running Springs and Big Bear will have daytime temperatures in the upper 50s to low 60s and overnight lows in the low 30s for Big Bear and in the low 40s for Running Springs. All areas will have gusty NE winds especially in the canyons and along the ridges. Today Fire Danger Level will be VERY HIGH. Have a good day and enjoy the Fall Weather. On the “ALERTS and TRENDS” page, I have added some Climatology info, and a look at the upcoming Winter Outlook for a possible La Nina. Have a good Day and enjoy the nice Fall weather here in the Mountains. RC

Sunday, Sept 24, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Change is in the air this morning! The thick Marine layer is gone, and has been replaced with a weak North East flow. The area of Low Pressure that brought clouds and fog over the last week has moved out to the North East. As the Low moves out, Surface High pressure will build into the Great Basin. This will create an offshore flow due to a 8-10mb Pressure Gradient between Tonopah and the San Diego Coastal area. So for today, we will have increasing North East winds across the area. Currently, we already have weak NE flow across the mountain which will spread toward the Coast throughout the day. We can expect North East winds from 10-25 mph for most areas with gusts to 40mph in the wind prone areas through Wednesday morning. Monday and Tuesday look like we will have the strongest winds locally. Along with the NE winds, humidity levels will lower to the teens or below at times mainly in the afternoon hours. This will create periods of Very High Fire Danger Levels for most of SoCal. Fortunately, with the moist weather we have had this past week, we won’t be in a critical Fire situation for this Santa Ana wind event. Wednesday, a Cut Off Low will develop over the Colorado River area which will should put an end to the NE flow locally. Temperatures will be very Fall like across the mountain. Highs for the Crestline and Arrowhead areas will be in the low to mid 60s through Wednesday. Overnight lows will be in the upper 30s to mid 40s. Big Bear and Running Springs will have Highs in the upper 50s to low 60s, and overnight lows in the upper 20s to low 30s for BB, and upper 30s to low 40s for RS. Clear skies will be the forecast through Tuesday and gusty winds. On the long range outlook, there will be a chance for a shower on the 3rd of October, and again on the 8th as it looks this morning from two Low Pressure troughs dropping south from NorCal. Most likely we will have a thick Marine layer at that time with drizzle below the 6500′ level. On the ALERTS and TRENDS page, I have added some Climatology info, and a look at the upcoming Winter Outlook for a possible La Nina. Have a good Day and enjoy the nice Fall weather here in the Mountains. RC

Saturday, Sept 23, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Happy Birthday, Ryan!
This morning, broken cloud cover over the Valley will give way to hazy skies today. For the Mountains, clear skies will be the forecast for the next few days as the trough of low pressure that brought cloudy and cool conditions, lifts out and heads North East. Behind the departing trough, North East flow will develop later today and Saturday as surface pressure builds in the Great Basin. The surface pressure will be around 8mb stronger at Tonopah than San Diego. This should be sufficient to produce 10-25mph North East winds across the local area at times over the next few days. The wind prone Ridges and Canyons will likely see stronger gusts possibly up to 45mph at times, through the period. After this mornings clouds burn off over the Valley, clear skies will be the forecast for that area as well. Temperatures in the Valley will be on the rise and be near 90* by Monday/Tuesday. Across the Mountain, daytime high temperatures will remain cool with highs in the mid 60s to low 70s over the next three days. Overnight lows will run from the mid 40s locally to the low 30s in the Big Bear area. Due to the North East flow, we will have low humidity levels, and higher Fire Danger levels. So as always this time of year, be very careful with any outdoor fire including BBQs, Welding, etc. High pressure over the Pacific East, will keep us in a normal weather pattern for this time of year. No rain is likely for the next five days. On the ALERTS and TRENDS page, I have added some Climatology info on the upcoming Winter Outlook for a possible La Nina. Have a good Day and enjoy the nice Fall weather here in the Mountains. RC

Friday, Sept 22, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
This morning we have light fog along the Rim below the 4500′ level. After a nice wet, foggy, and rainy day in some areas yesterday, today we will begin to clear out for a nice, cool, but mostly clear day. Rainfall totals are listed below in the 24hour temperatures section. Up to 5″s of Snow fell in the Mammoth Mountain area yesterday, and more snow showers are expected today with little to no additional accumulations expected. This mornings surface data has almost an even pressure gradient from Tonopah, to San Diego. Therefore we will have light winds this morning from the SW as the area of low pressure begins to move East. Temperatures will remain very cool for the first day of Fall locally. Highs today will be in the low to mid 50s for Crestline and Arrowhead, as well as Big Bear, and Running Springs. Overnight lows will be in the low to mid 30s for most areas except Big Bear where overnight temps will dip into the upper 20s. Cool weather will be the long range forecast as High pressure sets up over the Great Basin for the next several days. The surface pressure gradient for the Tonopah to San Diego area is expected to be around an 8mb difference with the higher pressure over the Great Basin by Monday. As the surface pressure expands over the Great Basin, North East Winds will develop across SoCal, beginning Saturday afternoon, along with warmer temperatures in the Valley, and much lower Humidity levels. This will be our first Santa Ana winds of Fall. Please be careful with any and all outdoor fire. For the long range outlook, not much change from what we have today other than a slow warming for the mountain areas and gusty winds through Friday of next week. Hurricane Maria is now at a CAT3 and is projected to stay off shore from the East Coast. However, the Eastern Seaboard will see some effects from Maria in high surf and gusty winds. That’s it for today. Have a good day and enjoy the Fall like weather. RC

Thursday, Sept 21, 2017

 

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TODAY’S WEATHER DISCUSSION AND FORECAST:



Good Morning.
Light rain has moved into the area below the 6500′ level this morning. Fog and clouds will be the main feature today along with occasional light rain showers. Rainfall amounts are expected to be from .10-.50″ today for the Lake Arrowhead and Crestline areas. Most of the rainfall accumulations will be along the Rim. Above the 6500′ elevation, very little accumulation is expected. The freezing level during the storm will be around the 10,000′ level so a few snow flurries may be possible on the local ridges in the Big Bea area. As the trough of low pressure slides south today, it will bring light rain showers to the area throughout the day along with Gusty South West winds. Gusts from 10-25mph will be likely for most areas, and higher gusts in the wind prone areas. The center of this Low is well to our North and will slowly move East over the next couple of days. As the low move East, SoCal will pick up gusty NE winds, dryer air, and much warmer temperatures for the Valleys and foothill areas. Here we will stay fairly cool as usual when we have Santa Ana winds. High temperatures today will be from 50-55* with overnight lows in the mid to upper 30s. Big Bear and Running Springs will have temps in the mid 50s today with overnight lows in the upper 20s to low 30s after the storm has passed. Tomorrow, temperatures will warm by around 5*-7* across the area. Don’t forget to use your headlights when driving in the fog so other can see you. RC