April 20, 2026 8:39 PM

Chance of Isolated Thunderstorms This Afternoon

HIGH DESERT, CA. (Pain In The Pass) >>Tuesday will feature a blend of sun and clouds, with a good chance of pop-up thunderstorms in the afternoon. It will be hot and humidity will be up, with highs in the 100s to mid-110s.

Southern California Weather Force is predicting isolated to scattered showers and thunderstorms to sweep across Southern California Tuesday, July 23. The of threats are dry lightning, and gusty winds, according to SCWF. The SCWF has issued a Thunderstorm Watch for this afternoon.

Today flow will be east-southeast to west-northwest. This means that storms forming first over Big Bear Lake will shove outflow through the Lucerne Valley zones, and into parts of the Apple Valley forecast area.

It looks like the best chances will be mainly in the early to late afternoon hours today. Today’s strom chances are right around 30% and tomorrow’s chances are at 20%.

Today thunderstorms will be high-based and can produce little to a lot of precipitation at times, especially considering the faster movement of storm activity. Each thunderstorm cell will also be capable of producing gusty, erratic outflow winds, gusting upwards of 45 to 60+ mph in region.

The heaviest downpours can have the potential to bring a quick 1-2 inches of rain. The risk for localized flash flooding is , but cannot be ruled out because the ground is dry and the burn scars areas.

“When Thunder Roars, Go Indoors”high

If you travel through the Cajon Pass or on Interstate 15 expect traffic due to the weather condition can change quickly. Remember to SLOW DOWN in the rain and or blowing dust.

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Cajon Pass
8:39 pm, Apr 20, 2026
temperature icon 55°F
overcast clouds
Humidity: 52 %
Pressure: 1014 mb
Wind: 12 mph
Wind Gust: 17 mph
Clouds: 100%
Visibility: 10 km
Sunrise: 6:11 am
Sunset: 7:24 pm
  • Temperature
  • Precipitation
  • Rain Chance
  • Wind
  • Humidity
  • Pressure
11:00 pm
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48°/54°°F 0 mm 0% 12 mph 55% 1014 mb 0 mm/h
2:00 am
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45°/49°°F 0 mm 0% 9 mph 57% 1015 mb 0 mm/h
5:00 am
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44°/44°°F 0 mm 0% 9 mph 56% 1015 mb 0 mm/h
8:00 am
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51°/51°°F 0 mm 0% 11 mph 35% 1015 mb 0 mm/h
11:00 am
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61°/61°°F 0 mm 0% 17 mph 29% 1015 mb 0 mm/h
2:00 pm
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61°/61°°F 0 mm 0% 21 mph 44% 1014 mb 0 mm/h
5:00 pm
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53°/53°°F 0.2 mm 20% 16 mph 80% 1014 mb 0 mm/h
8:00 pm
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49°/49°°F 0.22 mm 22% 15 mph 74% 1015 mb 0 mm/h