SPM 05-19-2019: Widespread Showers and a Few Embedded Thunderstorms

Issue Date: Sunday, May 19th, 2019
Issue Time: 9:10 AM MDT

Summary:

An upper-level trough traversing the Central Rockies yesterday was the culprit behind an unsettled Saturday across Colorado. The trough shifted broad-scale lift overhead, providing enough forcing to produce scattered rain and snow showers over the High Country, and widespread showers (with a few embedded thunderstorms) east of the mountains. Most of the precipitation was light, owing to generally meager moisture. However, across the eastern plains where activity persisted for a few hours, thunderstorms were able to draw on moist outflow from previous showers/storms to produce periods of moderate rainfall. Generally speaking, the first showers of the day began between around 10 AM, with most activity coming to an end by 8 PM; a few showers lingered over the northern High Country until 10 PM.

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 vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.

SPM 05-18-2019: Scattered Showers and Thunderstorms, A Few Severe Over Northeast Colorado

Issue Date: Saturday, May 18th, 2019
Issue Time: 9:10 AM MDT

Summary:

An upper-level trough that was centered over the Great Basin on Thursday pushed eastward and moved overtop of Colorado yesterday and provided large-scale lift for the development of showers and thunderstorms. Most of the activity occurred over the High Country and Northeast Colorado, while the Southeast Plains were more-or-less shut out thanks to a lack of surface moisture (dewpoints were in the 20s and 30s). The strongest storms of the day occurred over the Urban Corridor and Northeast Plains north of I-70, producing hail, strong winds (one severe gust of 66 mph reported in Briggsdale), and periods of moderate rainfall. The following severe hail reports were submitted to the National Weather Service:

2.75 inch hail: Sedgwick (Sedgwick County)
2.50 inch hail: 4 miles E of Merino (Logan County)
2.00 inch hail: Sedgwick (Sedgwick County)
1.75 inch hail: Crook (Logan County), Sterling (Logan County)
1.50 inch hail: 1 mile ENE of Sterling (Logan County), Sedgwick (Sedgwick County)
1.25 inch hail: 8 miles W of Greeley (Weld County)
1.00 inch hail: Frederick (Weld County), 12 miles NNE Pawnee Buttes (Weld County), 2 miles N of Dailey (Logan County), 9 miles NW of New Raymer (Weld County), 9 miles SW of Westplains (Weld County)

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 vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.

SPM 05-17-2019: Gusty Winds for Western Colorado and a 97°F High in Lamer

Issue Date: Friday, May 17th, 2019
Issue Time: 9:20AM MDT

Summary:

Despite increasing cloud cover over the state, high temperatures were still well above the seasonal average for another day. With nearly no cloud cover over the far eastern plains, most areas were able to hit above the 90°F mark with Lamar reaching 97°F! Strong surface winds were present over western Colorado and were generally measured in the 20-25 mph range with gusts between 45-60 mph. A gust of 73 mph was recorded over Douglas Pass! Without much low level moisture, storms weren’t able to drop a lot of rainfall. CoCoRaHs in La Plata County recorded between 0.16 and 0.22 inches. The highest observation of the day was in Mineral County where 0.25 inches was recorded. As anticipated, rainfall over the Northeast Plains produced under 0.2 inches. Flooding was not reported on Thursday.

To see precipitation totals from yesterday, scroll down to the State Precipitation Map below. Note the 0.25 inches in Summit County is incorrect. We are working to fix this error.

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 vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.

SPM 05-16-2019: A Handful of Eastern Colorado Towns Hit 90°F with Hot, Spring Temperatures Statewide

Issue Date: Thursday, May 16th, 2019
Issue Time: 9:10AM MDT

Summary:

Another day of warming under the ridge, means Colorado was able to hit the 90°F mark in Lamar, La Junta, Pueblo, Wray and Greeley. While this benchmark occurred a little early than normal, it is not too unusual. Without much moisture under the ridge, only light showers occurred yesterday. The majority of the totals over the mountains were under 0.1 inches with isolated totals of 0.1 inches over the San Juan Mountains. Storms that formed out east grazed the border counties. With a bit more moisture in place, radar estimated 0.25 inches were able to fall. Only one storm report from yesterday. A gust of 58 mph was recorded at a mesonet in Basalt due to a high-based thunderstorm in the vicinity. There was no flooding reported.

To see precipitation totals from Wednesday, scroll down to the State Precipitation Map below. Please note the 0.5 inches over Summit County is not correct.

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 vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.