Synopsis: We’re in the midst of our most significant heat wave of the year thus far with excessive heat warnings to continue through the remainder of the week. The impetus for this heat, is a well-defined omega (blocking) pattern across the Western US. A strong cutoff low resides off the west coast of SoCal with another area of low pressure over the Great Plains. Sandwiched in between is an amplified ridge of high pressure over AZ. Well above average temperatures will continue through Sunday with highs peaking at or above the 110°F mark during this time. Please make sure to take necessary precautions in order to avoid heat related illness as outdoor conditions could be deadly to the unprepared.
For today plan on mainly sunny skies across the region. Afternoon temperatures will warm into the 108°F-110°F range around the Valley with readings around 105°F across the northern and eastern foothills locales. Variable winds will generally hover in the 5-10mph range with afternoon/evening gusts in the 15-20mph range. Overnight lows will remain rather warm only falling into the upper 70s around the urban corridor under mostly clear skies.
Friday looks to be the hottest day of the week and the year so far. Daytime highs will climb into the 110°F-113°F range around the Valley under mostly sunny skies. Variable winds will generally remain in the light category with normal afternoon/evening breezes in the 10-15mph range. Overnight lows will again remain rather warm only reaching the upper 70s for a few hours around dawn. Moving ahead, excessive heat will continue through the upcoming weekend with highs around the 110°F mark on Saturday and again on Sunday. We’re also likely to see an intrusion of moisture across the southern half of the state this weekend. Isolated storm activity will be possible across the higher terrain areas both Saturday and Sunday, though we’re not expecting any rain over the lower deserts. Guidance is hinting at some relief to the heat next week with our blocking pattern breaking down. We’ll have more on this in the coming days.