SPM 06-01-2020: Scattered Storms Fire with Residual Moisture Under the Ridge

Issue Date: Monday, June 1st, 2020
Issue Time: 9:55AM MDT

Summary:

A bit of drying under the ridge with more westerly flow aloft helped decrease the rainfall threat yesterday. With a similar pattern over the last few days, storms were diurnally driven beginning in the early afternoon. Yesterday, storms favored the eastern foothills with lighter rainfall over western Colorado. A strong gust was recorded over Logan County associated with a storm becoming downdraft dominate around 8PM (58 mph). Westerly flow helped push a few of the storms into the adjacent plains, but they mostly only survived over the Palmer and western Raton Ridge (convergence on the higher elevations). Fort Collins got a nice storm with totals on their mesonet up to 0.47 inches. They’ve had about 2 inches of rainfall over the last 30 days. Some stronger storms were also present near the Air Force Academy/Fort Carson areas where USGS gauges recorded just over a half inch of rainfall in 20 minutes.

Back west, the eastern San Juan Mountains got some nice accumulations with the Del Norte area receiving about a half inch of rain. Even the edges of the San Luis Valley received some measurable rainfall, but Alamosa (interior) only received about 0.05 inches. Storms started to come to an end around 11PM, which is a couple hours after instability began to drop off. Flooding was not reported as of this morning.

For precipitation estimates in your neighborhood over the last 24-hours, scroll down to the State Precipitation Map below.

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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.