Weather Outlook

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Date & Time: 09/18/2018 10:10 AM MST

Forecaster: Henz, D.
We have one more day of well above average temperatures before excellent rain chances tomorrow and a welcomed cool down. High pressure will break down today as the ridge moves east and a Pacific disturbance digs south over the SoCal coast. Meanwhile, developing southerly flow will pull significant moisture north into AZ by later tonight/overnight. For Wednesday a combination of upper level forcing, sufficient moisture, and daytime heating will result in scattered showers mixed with periods of afternoon/evening t-storms some of which could produce severe weather, heavy rainfall, and localized flooding. Moving ahead, modest storm chances will linger into Thursday and Friday to go along with much more seasonable temperatures.

For today plan on clear and sunny skies through the afternoon/evening before increasing cloud cover later tonight. Afternoon temperatures will climb into the 105˚F-107˚F range around the Valley. Variable winds will hover in the 2-7mph range with localized greater gusts around 10-15mph this evening. Overnight lows will remain in the mid 80s around the urban corridor under cloudy skies. Southern portions of the County may also see some overnight shower activity moving north out of Mexico.

For tomorrow plan on cloudier morning conditions with possible showers already overspreading portions of the County. Daytime highs will take a large step back into the low 90s with perhaps even cooler values pending timing of the rain. As covered above, we’re expecting a busy afternoon/evening with most zones likely seeing activity. Greatest concerns will be to localized areas that experience stronger t-storms as heavy rainfall (1.00”-2.00”+) and resulting flooding will be a concern. Otherwise, most zones should see lower totals with general lower intensity rains. Heading into Thursday, the “mild” temperatures will continue with highs remaining in the mid to upper 90s along with lingering afternoon/evening storm chances.

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