FTB 07-09-2019: Return of Dry, Warm Weather After a Wet Weekend

Issue Date: Tuesday, July 9, 2019
Issue Time: 9:45AM MDT

Flooding is NOT expected today

Clear skis and warm temperatures are expected statewide today after a week of wet weather. Upper level flow has transitioned to the west as a high pressure ridge builds over the southwest United States. This will bring in dry, hot air from the west and southwest shown in yellow in the water vapor imagery below. At the surface, a broad area of high pressure has set in, which will prevent moisture advection from the south and east. Dewpoints this morning have dropped significantly over the western half of the state and high country, with measurements in the 30°Fs over the western border and decreasing into the teens over the Central Mountains. Large scale subsidence and down sloping winds throughout the day will mix out moderate to high levels of residual moisture over the eastern plains. There is a slight chance for afternoon thunderstorms along the northern border of the state as a shortwave (marked with an “X” below) and left entrance region of a jet streak pass over Wyoming this afternoon and tonight. Dry air in the low levels is forecast to limit accumulation to trace amounts, with the primary threat being gusty winds.

Riverine: As of 9:30AM this morning there are no NWS Flood Warnings. There is a flood advisory currently in effect for the Roaring Fork River near Aspen in Pitkin County. Minor lowland flooding is possible along the river, with snowmelt increasing as temperatures warm up this week. AHPS gages remain in action stage on the Arkansas River at La Junta, the Rio Grande near Alamosa, and the Blue River below Dillon as dam releases continue. Water levels remain high in the Platoro and Terrace Reservoirs in Conejos Country. Minor lowland flooding is possible along the Conejos River due to dam releases.

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, scroll below the map.

Zone-Specific Forecasts :

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

Chances of precipitation are very low today and confined to the northern border of the forecast area. A cold front associated with the shortwave passing over Wyoming this afternoon will provide a small chance of lift and weak afternoon storms. Moisture will mix out throughout the day due to down sloping winds and advection of dry air from the west. Accumulation is forecast to be from a trace to 0.05 inches. Dry air underneath the storm could cause virga, making the primary threat over the area wind gusts up to 30 mph. High temperatures will reach into the upper 90°Fs over the southeast, with highs in the upper 80°Fs over the northeast quadrant, and 70°Fs and 80°Fs over the low laying areas of the high country.

Primetime: 3PM to 8PM

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

The area is going to dry out quickly today, with dewpoints expected to drop into the single digits over the southwest quadrant of the state. Clear skies and warm temperatures are forecast for today with little to no chance of precipitation. Winds are forecast to be calm underneath the large zone of high pressure. High temperatures in the mid 80°Fs are expected over most of the area, with the Grand Valley reaching into the mid 90°Fs.