-A LOW<\/strong> flood threat has been issued for the Front Range, Urban Corridor, Northeast Plains and the Spring Creek burn area.<\/em><\/p>\n PM update (3PM): An additional MODERATE<\/strong> flood threat has now been issued over the Northeast Plains. Dew points<\/span> over the area have been steadily increasing from this morning, resulting in higher instability and increasing rain rates. Another round of storms are expected to move in off of the Cheyenne Ridge this evening, and we have increasing confidence that storms should produce 1-hour rain rates around 1.75 inches. Isolated<\/span> storm totals due to multiple rounds of rainfall are forecast to be just over 2.5 inches. The threat over this area will end after midnight.<\/span><\/p>\n Another round of widespread<\/span> thunderstorms is expected today across the eastern plains. Surface moisture is high throughout the state again with dew points<\/span> (green contours below) measuring in the 50°Fs and 60°Fs over the western valleys and eastern plains respectively. PW<\/span> values this morning at Denver were measured at 1.17 inches and should continue to increase throughout the day, which is very high for this time of year. The subtropical high is now centered over south-central New Mexico, which will create westerly steering flow aloft over our area. A jet streak<\/span>, which can be seen in the yellow shading of the mid-level water vapor imagery below, will bring in dry air and fast winds to the west today. This should mix out a lot of the mid-level moisture seen in today’s Grand Junction sounding. This feature will also help to keep storms moving and keep rain rates below flood threat criteria. A vorticity maximum is forecast to form in the lee of the Rockies over southern Wyoming this afternoon, which will provide forcing for widespread<\/span> severe thunderstorms<\/span> over the adjacent and far eastern plains. In the moisture rich environment, all storms that form today will be capable of heavy rainfall, thus the large Low threat area.<\/p>\n Morning cloud cover over the northern mountain ranges and portions of the eastern plains will help retain surface moisture this morning. Surface winds from the east and southeast should keep low level moisture from mixing out as well. The surface low pressure system centered over the Oklahoma Panhandle (marked “L”) below will help drive these low level winds.<\/p>\n Storms are forecast to begin over the Continental Divide<\/span> by mid-day and move over the adjacent plains early this afternoon. Slow upper level steering flows from the northwest between 10 and 15 mph will allow storms to produce heavy rainfall over a 1-2 hour period. Storms will likely be crossing the I-25 interstate around rush hour, so please use extra caution as water will likely pool with the heavy rainfall this afternoon. As the storms move east, a few severe thunderstorms<\/span> will be possible as indicated by the skinny CAPE<\/span> profile in the Denver sounding this morning. Threats further to the west include wind gusts in excess of 60mph and hail between 1.75 and 2 inches (isolated<\/span>). Rain rates will also increase as storms slow down and enter dew points<\/span> in the 60°Fs to the east. Thus, there is a Moderate flood threat issued, which is anticipated to last until 4AM tomorrow morning.<\/p>\n
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