FTB 06-09-2019: Cool Temperatures & a Break in Rainfall Activity

Issue Date: Sunday, June 9th, 2019
Issue Time: 8:50AM MDT

–A LOW flood threat has been issued for portions of the San Antonio/Conejos Rivers and for the headwaters of the Rio Grande and San Juan Rivers including the Rio Grande near Del Norte.

The cold front is officially through the state, so everyone is waking up to much cooler temperatures. Temperatures in the mountains are as low as freezing with 50Fs and 40Fs for the lower elevations. More moisture to the east means cloud cover. Don’t expect it to last all day as dry air behind the trough will work its way over the state and mix out the shallow moisture by this afternoon. Depending when this occurs, it will affect high temperatures. Overall, highs today will drop ~15-20°F from yesterday.

There is still some ongoing, light precipitation over the northern mountains, but this isn’t expected to last past the morning hours. Minus some isolated, weak CAPE values along the Continental Divide this afternoon, a stable air mass will be over the state thanks to a strong inversion at the mid-levels of the atmosphere. Therefore, there will be a break in rainfall activity today. Cloudiness will increase over the southwest corner of the state this afternoon, and cool overnight temperatures are forecast statewide once again. NWS Grand Junction has a Freeze Watch is in place over the Northwest Slope and Northern Mountains through Monday morning.

Despite cooler temperatures, snow will continue to melt at the higher elevations over southwest Colorado, so the Flood Watch for the San Juan Mountains and San Luis Valley continues. A Low flood threat has also been issued for portions of the San Antonio and Conejos Rivers, Rio Grande River (especially near Del Norte) and for all headwaters of the San Juan River and Rio Grande. Please tune into your local NWS office for the latest on flood warnings, advisories and statements.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below. For Zone-Specific forecasts, scroll below the map.

Flood Threat Legend

Zone-Specific Forecasts:

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

Still quite a dry air mass over the western portion of Colorado, therefore, not forecasting rainfall this afternoon. Increased cloudiness can be expected over the San Juan and Central Mountains later today. Cooler temperatures may slow down the efficiently of the melting rates today, but melting will occur nonetheless. The Flood Watch continues for the San Juan Mountains and San Luis Valley. A Low flood threat has also been issued for portions of the San Antonio and Conejos Rivers, Rio Grande River (especially near Del Norte) and for all headwaters of the San Juan River and Rio Grande. Areal Flood Advisories (as of this morning) are issued for the following: Central Hinsdale County above Lake San Cristobal along Williams Creek, Colorado River near the CO/UT state line, Animas River near Durango, San Juan River at Pagosa Springs, La Plata River at Hesperus, Manco River near Mancos and the Gunnison River above Grand Junction. Follow the NWS for the latest updates on the daily runoff and river stages.

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

Cool temperatures today with highs in the mountains reaching the 50Fs. Temperatures over the adjacent plains will reach the 60Fs with 70F possible over the Southeast Plains. Cloud cover will begin to burn off early this afternoon, so expect pleasant temperatures to round out the weekend. Rainfall is not forecast, though a couple of light showers near the Continental Divide may be possible. Flooding is not forecast.