Friday, Sept 28, 2018






Today’s Forecast for Crestline, Twin Peaks, Lake Arrowhead and the San Bernardino Mountains.

Good Morning.
Changes are coming!
Today we will have high clouds from 30-40k’ making for good Sunrise and Sunsets. Onshore flow will continue though weak for most of the day. The surface pressure this morning is approx 2-3mbs onshore from the Coast to the Desert. A Trough will move through SoCal later today which will bring a cooling trend along with gusty South West winds, and start a weather pattern change. As the trough approaches gusty winds will develop due to an increase in the surface pressure gradient across the region. For Saturday through early next week, temperatures will cool off quite a bit as a couple of Troughs move through the SoCal Region. Also, Rosa now a CAT4 Hurricane to our South, will make a turn to the North heading toward SoCal as the first Trough passes through to our North. Higher pressure East of Rosa will be the guiding force in the direction Rosa takes. As of this mornings models, Rosa will weaken to a Tropical Storm over the next couple of days and head into the far South Eastern Deserts of SoCal. Most of the energy will go into Arizona. However, a cold Trough of Low pressure will likely draw enough moisture into the SoCal region from the remnants of Rosa to warrant a good chance for showers and or Thundershowers locally from Monday through Wednesday morning. Due to the cold air from the Trough and the warm air from Rosa mixing across the SoCal area we will have plenty of instability to promote showers locally. Sunday we should see a build up of clouds across the area then Monday and Tuesday should be mostly cloudy. I guess I had better dust off my rain gauge! Gusty winds from 10-30mph will be possible especially in the wind prone areas. Depending on how this plays out, we could see upwards of 1-2″ of rain. Fingers crossed!
Enjoy the ever changing Mountain weather. Have a good day today and enjoy the great Mountain weather.

Yesterday’s High and Low temperatures were:
Crestline-86/63*, Twin Peaks-83/61*, Lake Arrowhead-85/64*, Running Springs-77/60*, Big Bear-78/38*, San Bernardino-102/63*.
Average local temps for today are: 47/72*. MIN-34*(1948) MAX-85*-(1963)

Forecast Temperatures for the next three days:

Crestline, Twin Peaks, Lake Arrowhead:
Fri-77-84*/58-64*, Sat-68-74*/50-58*, Sun-69-74*/54-60*, Mon-62-68*/54-62*-chc of rain 25%-pm.

Big Bear, GVL, Running Springs:
2Fri-74-78*/38-48*, Sat-65-74*/37-48*,Sun-68-74*/38-44*, Mon-62-68*/40-45*-30%chc of PM showers.

San Bernardino:
Fri-92-96*/59-65*, Sat-85-90*/55-65*, Sun 84-89*/58-65*, Mon-82-86*/58-64*-10%chc of a shower.

Thank you for joining me @, or on Facebook @ Lake Gregory Weather Group, Rim Weather, or, San Bernardino Mountains.
On another note, there is a new source for local news that can be found at,
If you are interested in buying a rain gauge or any other weather instruments, click on the Ambient weather graphic toward the bottom of this page to access their website.

0 replies

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply