SPM 08-27-2018: Isolated Thunderstorm Coverage with Arroyo Flooding Reported in Montrose County

August 27, 2018 by ·

Issue Date: Monday, August 27th, 2018
Issue Time: 09:05 AM MDT

Summary:

Westerly and southwesterly flow aloft was in place over Colorado on Sunday with the shifting upper-level trough. Drier air embedded with the afternoon shortwave knocked down coverage a bit when compared to Saturday. Quick storm motion also helped limit rainfall totals. With drier low-levels, gusty winds in the 50-60 mph range were reported along the Front Range and Northwest Slope. Over Western Colorado, some stronger storms developed over the Grand Valley and northern Southwest Slope near the CO/UT border. Brief heavy rainfall over an arroyo triggered a mud flow that partially covered the highway near Montrose along Highway 90. Traffic was unaffected by the mud flow at the time of the report (6:20 PM MDT). Small hail was also reported with these storms. Radar rainfall estimates in this area were up to 0.5 inches without any observations in the area.

To see how much precipitation fell over your area yesterday, scroll down to the State Precipitation Map below.

Click Here For Map Overview

The map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (QPE) across Colorado. The map is updated daily during the operational season (May 1 – Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where flash flooding may have occurred). The 24-hour, 48-hour and 72-hour total precipitation contain bias corrections that are not disaggregated into the hourly estimates, so there will likely be some differences. The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas (post 2012), which are updated throughout the season to include new burn areas. The home button in the top left corner resets the map to the original zoom.

Filed Under: State Precipitation Map ·

SPM 08-26-2018: Uptick in Showers and Thunderstorms

August 26, 2018 by ·

Issue Date: Sunday, August 26th, 2018
Issue Time: 9:30 AM MDT

Summary:

Ahead of an approaching upper-level trough, southwesterly flow aloft brought an increase in moisture to Colorado, providing the fuel for scattered showers and thunderstorms across the state. The best rainfall, in terms of coverage and persistence, was across the higher terrain of the Southwest Slope and San Juan Mountains regions. Showers and thunderstorms in that area began before lunchtime, and continued well into the nighttime hours, producing rainfall totals that were generally between 0.25-0.75 inches, with a report as high as 1.31 inches in La Plata County. East of the Mountains, where low-level moisture and instability was favorable, a few strong thunderstorms rumbled, producing small hail, strong winds, and periods of heavy rainfall. The rainfall “winner” of the day came from Yuma County, where 2.19 inches of rain was observed from multiple rounds of thunderstorms through the afternoon and evening hours.

No flash flooding was reported yesterday. For a look at precipitation estimates in your area, please see the State Precipitation Map below.

Click Here For Map Overview

The map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (QPE) across Colorado. The map is updated daily during the operational season (May 1 – Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where flash flooding may have occurred). The 24-hour, 48-hour and 72-hour total precipitation contain bias corrections that are not disaggregated into the hourly estimates, so there will likely be some differences. The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas (post 2012), which are updated throughout the season to include new burn areas. The home button in the top left corner resets the map to the original zoom.

Filed Under: State Precipitation Map ·

SPM 08-25-2018: Isolated Showers and Thunderstorms Brought More Wind than Rain

August 25, 2018 by ·

Issue Date: Saturday, August 25th, 2018
Issue Time: 9:30 AM MDT

Summary:

As the upper-level ridge shifted east of the state, the approach of the next upper-level trough brought a bit of energy and moisture back into Colorado, resulting in a few isolated showers/weak thunderstorms across Northern Colorado. The bulk of the activity was confined north of I-70 and west of the Continental Divide where the best mid-level moisture resided, but a few gusty showers did impact the Urban Corridor during the late evening/early nighttime hours. Generally speaking, rainfall rates were light due to dry air near the surface, with the best rainfall, relatively speaking, falling over the High Country north of I-70. As far as storm reports are concerned, the gusty showers that moved over the Denver metro during the evening resulted in the only significant reports of the day:

58 mph wind gust: 2 miles SW of Rocky Flats (Jefferson County)
56 mph wind gust: 2 miles SSW Broomfield (Broomfield County)

No flash flooding occurred yesterday. For a look at precipitation estimates in your area, please see the State Precipitation Map below.

Click Here For Map Overview

The map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (QPE) across Colorado. The map is updated daily during the operational season (May 1 – Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where flash flooding may have occurred). The 24-hour, 48-hour and 72-hour total precipitation contain bias corrections that are not disaggregated into the hourly estimates, so there will likely be some differences. The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas (post 2012), which are updated throughout the season to include new burn areas. The home button in the top left corner resets the map to the original zoom.

Filed Under: State Precipitation Map ·

SPM 08-24-2018: Downsloping Winds and General Subsidence Bring an End to the Monsoon Surge

August 24, 2018 by ·

Issue Date: Friday, August 24th, 2018
Issue Time: 09:15 AM MDT

Summary:

There were a few showers to start the morning over the northwest corner of the state. However, downsloping winds and increased subsidence behind the trough on Thursday brought an end to the monsoon surge. This decrease in low-level moisture could be seen in the rapidly dropping dew points, which went from the 50Fs to low 40Fs throughout the day. This contributed to a downtick in afternoon thunderstorm activity; however, some weak storms over southern Colorado still popped up in the afternoon. A bit more low-level moisture remained over this portion of the state as seen in the water vapor imagery from yesterday’s FTB. Again, low dew points and swift steering winds limited the amount of rainfall the storms were able to produce. Max radar estimated 24-hour totals near the Raton Ridge were just under 0.5 inches. To the west, a CoCoRaHS station in southern Dolores County recorded 0.31 inches. Flooding was not reported on Thursday.

To see how much precipitation fell over your area the last 48 to 72 hours, scroll down to the State Precipitation Map below.

Click Here For Map Overview

The map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (QPE) across Colorado. The map is updated daily during the operational season (May 1 – Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where flash flooding may have occurred). The 24-hour, 48-hour and 72-hour total precipitation contain bias corrections that are not disaggregated into the hourly estimates, so there will likely be some differences. The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas (post 2012), which are updated throughout the season to include new burn areas. The home button in the top left corner resets the map to the original zoom.
Filed Under: State Precipitation Map ·
« Previous Page
Next Page »