FTB 06-20-2018: High Pressure Takes Over

Issue Date: 6/20/2018
Issue Time: 8:10 AM


After a sufficiently active weather day yesterday, today will be marked by the return of high pressure and drier air. In the water vapor image below I have denoted the location of the mid-level high pressure center, along with its axis (blue dashes). The high pressure will shift eastward today, placing drier and cooler northwest flow over the state, resulting in mostly sunny skies and high temperatures that are reminiscent of spring time. A few isolated, brief, showers/weak thunderstorms will rumble across eastern Colorado during the afternoon/evening as daytime heating and residual moisture will have just enough “oomph” to trigger their development. Gusty winds and light rainfall will be the main threats from any such activity. For western Colorado, where it will be less about northwest flow and more about the ridge axis moving overhead, plenty of sunshine and near-average high temperatures are the name of the game today.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below (hover over threat areas for more details). For Zone-Specific forecasts, jump below the map.

Flood Threat Legend

Zone-Specific Forecasts

Front Range, Urban Corridor, Palmer Ridge, Northeast Plains, Southeast Mountains, Raton Ridge, and Southeast Plains:

Mostly sunny skies and pleasant high temperatures are the weather story today, with only a few, brief, isolated showers/weak thunderstorms breaking up the otherwise beautiful day. Gusty winds and light rainfall will be all the atmosphere can muster, and no flood threat is warranted. Rain rates will generally be 0.05-0.15 inches/hour, with maximum rain rates as follows:
Front Range, Urban Corridor, Southeast Mountains: 0.2-0.4 inches/hour
Northeast Plains, Palmer Ridge, Southeast Plains, and Raton Ridge: 0.5-0.7 inches/hour

Timing: Noon – 10 PM

Northern Mountains, Central Mountains, Northwest Slope, Grand Valley, San Juan Mountains, San Luis Valley, and Southwest Slope:

Mostly sunny skies and seasonal temperatures will mark this FTB period as high pressure builds overhead. Fair weather cumulus clouds will bubble over the higher terrain, and a weak shower or two cannot be ruled out over the Northern Mountains and Central Mountains, but that will be all the atmosphere can produce today.

Maximum rain rates from any showers that develop over the Northern Mountains and Central Mountains will be 0.05-0.15 inches/hour, with more virga and gusty winds than rain being the general rule.

Timing: Noon – 9 PM