Tuesday July 27, 2021 Forecast First


Storms remain in the forecast with a heavy rain emphasis on a late week/weekend timeframe.

Storm activity today has a Southwest CO/Four Corners region focus. Storm motion is mostly confined to the higher elevations and is moving from the southeast to northwest. The hazards remain as gusty winds, small hail, cloud to ground lightning and brief heavy downpours with the associated flooding. The Grand Valley and the Uncompahgre Valley each retain a slight chance of passing thunderstorms before 10 pm. Aside from this storm pattern Tuesday night, wind speeds should remain breezy.

The responsible weather maker of late is a repositioning high pressure system. This high is anchoring itself to our east and that longitude will allow an impressive sub-tropical tap from the Gulf of Mexico/Mexican Occidental Mountains (three distinct ranges). This set up along with a low pressure system migrating through the Desert Southwest will be a recipe for heavy rainfall and subsequent flood issues/transportation closures. Please stay weather aware during the late week/weekend, this will be our greatest rainfall timeline… after Thursday. Temperatures will still be running near the late July averages, but no records are expected (rainfall yes). As has been the case for mid July, storms start over the higher elevations then drift into the valleys. The heaviest rain and highest storm chances remain in those High Country genesis sites during the afternoon hours with the lower elevations/valleys falling under drifting storms during the evening and post sunset hours.

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