—LOW<\/strong> flood threat for Urban Corridor, Front Range, Palmer Ridge, Northeast Plains and Raton Ridge<\/em>
—PM update possible today<\/span><\/em><\/p>\n
The seemingly unending string of active weather across colorful Colorado will continue once again today. As shown in the water vapor image, below, several important features will combine to produce numerous<\/span> rounds of shower and storm activity today. First, a strong upper-level disturbance is noted in southern Wyoming. This will slowly move southward throughout the day. To its south, positive vorticity advection<\/span> will support large-scale upward motion and enhance precipitation. Additionally, a developing jet streak<\/span> will form over Colorado, further enhancing upward motion as Colorado will lie in the favorable right “exit” region of this jet streak<\/span>. Second, plenty of moisture remains in eastern Colorado this morning. Surface dew point<\/span> temperatures are in the 50s and 60s, which is above normal for this time of year. The moisture is not just limited to the surface but extends through a deep layer of the atmosphere, suggesting large warm layer depths and in turn, efficient warm coalescence rainfall generation within thunderstorm clouds. Finally, a surface front has entered northeast Colorado and will continue to push southwest through the day. This will be tempered by the still-strong August sun, but the front will provide a surface convergence boundary for storm formation across the Northeast Plains. The saving grace today that will limit the flood threat will be fast southeasterly steering winds above 25 mph, which will generally limit rainfall in any given location.<\/p>\n Overall, we expect numerous<\/span> rounds of showers and thunderstorms today across eastern Colorado. Initial coverage will be over the higher terrain, though storms should have little problem surviving on the eastward trek across the Plains today. The fast steering winds suggest a Low flood threat is appropriate for most regions. However, a small region with a Moderate flood threat will exist in far southeast regions where storm complexes are expected to be the largest, and thus multiple hours of heavy rainfall are possible. Activity will continue late into the evening and into the overnight hours especially across far eastern areas. Portions of the Arkansas River, especially towards the Kansas border are included in the Moderate threat and riverine flooding is possible today.<\/p>\n In addition to the flood threat, severe weather will be likely especially during the mid\/late afternoon. Very large hail up to 2.75 inches, along with gusty winds up to 75 mph are possible with the strongest cells.<\/p>\n
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