FTB 06-10-2021: Another Scorcher Before Cool Front Moves In

Issue Date: Thursday, June 10th, 2021
Issue Time: 9:00AM MDT

— Flooding is NOT expected today

Today will mark the culmination of the recent early summer heat wave, with temperatures as much as 15F above normal especially east of the Continental Divide. As shown in the visible satellite image below, although the ridge responsible for the heat wave has moved slightly south and east, a warm air mass still remains over Colorado. A quickly approaching shortwave to the west will drag a strong cool front, by summer standards, across Colorado this afternoon and evening. However, before that happens, strong downsloping flow will cause a spike in afternoon temperatures east of the Continental Divide with near record highs in sight. West of the Continental Divide, the cool front passage will temper the heat to near seasonal normal level.

In terms of precipitation chances, we expect the vast majority of the state to be rain-free today. The only exception will be the far northeast corner of the state. There, very high moisture (morning dewpoints are in the low 70s F in parts of the South Platte valley – incredibly high for Colorado) should provide enough instability to spark a few thunderstorms during the cold front passage overnight. However, with 35+ mph west/northwest steering flow, only short-term heavy rainfall is expected. Large hail and gusty winds will likely accompany the stronger cells during the cool front passage.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below. If there is a threat, hover over the threat areas for more details, and click on burn areas to learn more about them. For Zone-Specific forecasts, scroll below the threat map.

Zone-Specific Forecasts:

Northeast Plains:

Hot and humid today but staying mostly dry. A cool front passage will trigger isolated to scattered thunderstorms overnight along the KS/NE border. Max 1-hour rainfall up to 1.3 inches will be possible, along with large hail and very gusty winds. However, flooding is NOT expected today.

Primetime: 12AM through 4AM

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

Very hot and dry today with near record heat possible. Flooding is NOT expected today.

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

Cooler, dry and very windy today, especially in the northwest. Red flag warnings have been posted for parts of the region mainly for critically low relative humidity especially during the early afternoon before a cool front passes through the region. Flooding is NOT expected today.