|Radar Rain Shadow
||Jackson Still and Prosperity, two important Department of Forestry rainfall reporting locations, have been closed due to state budget cuts. Important CoCoRAHS stations in Calhoun, Holmes, and Bay counties, Fl no longer report. The important reporting station southeast of Dothan, Al in Houston county no longer reports. The eight (8) year average clearly shows the low rainfall in the radar rain shadow; Euchee Valley, Ponce de Leon, Bonifay, and Graceville all remain in drought. The stark demarkation of the dry rain shadow and the wet transfer areas increases later in the year. Yet in the first month of the 8 year averages, Argyle received nearly 2 1/2 times the rainfall of Bonifay, which lies inside the rain shadow. Both recording stations are Florida Forestry Stations and used identical standardized gauges and placement and are only 20 miles apart. The transfer of rainfall for 2011-2017 can be clearly reviewed at the Dec rainfall link below. That map shows that about 20" of rainfall is transferred out of the rain shadow to the wet zones on either side of the rain shadow. The left side wet zone is created by temperate cyclones that pass north of the region; the principle rain maker for the area. The right side wet zone or plume of moisture is generated by marine cyclones that approach from the Gulf of Mexico; those storms make up the bulk of the summer monsoon. Summer 2013, 2014, and 2015 were strong monsoon seasons resultant from the emerging strong El Nino that peaks in spring 2016 and created a large plume. When the monsoon fails, the plume may be weak or nonexistent. The long term average(s) will show the right side plume waxing and waning, depending on the strength of the summer monsoon. The left side plume, created by the more consistent and dominate temperate cyclones, will always reflect the transfer of rainfall out of the rain shadow to the wet zone plume. Studies of the west coast atmospheric rivers (ARs) from the Pacific that may break the California drought should include studies on how to transfer the watershed flooding frequently associated with the ARs. Microwave heating of the cloud base (Aquariusradar) can transport the additional flood waters out of the watershed to a neighboring watershed with storage reservoirs or to snowpack if orographic lifting is downwind.
||Clouds whose growth is inhibited by the microwave energy give up moisture to competing rain cells. By the use of NexRad radar reports and TITAN type software, these cells, both the target cell and competing cells, are selected to transport the excess rainfall to the storage watershed or snowpack. Learn more here
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