![\"Threat_Timeline_09072015\"](\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2015\/09\/Threat_Timeline_09072015.png\")
<\/a><\/p>\nKeeping with the theme of the previous FTO, there will be two rain events, but no flood threat is apparent with either. This is not unusual for September, as moisture values are on a climatological downward trend. Visually, the climatological precipitable water<\/span> curves shows this trend nicely (September highlighted by green rectangle):<\/p>\n Aside from relatively lacking moisture, significant upper-level disturbances are going to be hard to come by for this FTO period. Event #1 will be the result of a weak, surface cool front trailing southward behind a surface Low shifting across the northern US. Ahead of the cool front, Gulf moisture will be pulled into eastern Colorado, and northwesterly flow aloft will provide shear<\/span> to organize storms. With the higher threshold for flooding to develop on the plains, no flood threat can be identified at this time. This system will bear watching as the weekend draws nearer.<\/a><\/a><\/p>\n
\nEvent #2 will have effects from a mid-level disturbance and an associated surface cool front. Moisture does not appear to be sufficient enough to warrant a flood threat, and showers and garden-variety thunderstorms will be the main result. Late summer rains are always welcome, and this event will be no different. For more details, see the individual discussions below.<\/p>\n