All system are go for a pleasant weekend and the upper low currently just S of the Big Bend finally weakens and shears out. The pesky upper low which helped in steering the remnants of EPAC TC Vance NE across Texas brought and 8 foot rise in the Edwards Aquifer in a 48 hour period. This sort of steady rainfall was sorely needed across Central Texas. A cold front will arrive on Saturday reinforcing the pleasant Fall temperatures before the big pattern change we've all heard about by now ahead for next week.
The Global Ensembles and Operational computer guidance is in remarkably good agreement the former Super Typhoon Nuri will transition into a powerful Extratropical Storm near the Bering Sea. In the water vapor satellite imagery above, the storm is now entering the far upper left of the imagery and should wrap up and be rather impressive via satellite visible pictures over the weekend into Monday. Winds near or above 80 MPH with wave heights nearing 50 feet are forecast and expect near the Aleutian Island and the Bering Sea. The Super Storm will buckle the jet stream and allow very impressive cold air that has been building across Eurasia/Siberia due to extremely heavy October snowfall near record territory to be pulled across the Arctic into North America and spill very far south into Texas, Mexico and eventually into the Yucatan and Cuba later next week. The Canadian Prairies have been getting snow over the past several weeks, but the Northern/Central Plains are lacking any snow, so airmass modification will occur. That said the coldest air of the season will plunge S along and E of the Continental Divide and remain entrenched with reinforcing shots of cold air with the fast moving Northerly flow aloft and embedded upper air energy (shortwaves) bring cold fronts in fairly rapid progression during next week. The teleconnection indices are aligning in a very impressive fashion that bring a very - Arctic Oscillation/AO (-4+) -North Atlantic Oscillation/NAO (-1.5+) -East Pacific Oscillation/EPO (-4+) +Pacific North America Pattern/PNA (+3) regime together next week and just beyond the mid November timeframe. What this means for the Southern Plains and Texas is a Ridge of High Pressure build off the West Coast into Eastern Alaska into the Arctic while a very deep trough develops across Central and Eastern North America. The Pattern become blocked across the Atlantic which would allow the cold air to sweep E and miss our Region as we see in most Fall and Winter patterns. The fly in the ointment is the sub tropical jet across the Pacific and what it may or may not bring as El Nino continues to unfold.
There is convection associated with a tropical disturbance (96E) several hundred miles off the W Coast of Mexico and the track guidance is suggesting this disturbance remains rather weak, but does turn it NE toward the Pacific Coast of Mexico next week. At the same time the computer guidance is 'sniffing' a robust piece of upper level energy (shortwave) under cutting the Ridge out W and developing a low pressure system along the front range of the Southern Rockies near New Mexico/Colorado. This happens later next week (around November 15th -17th) after the Arctic front arrives late on Monday into Tuesday. IF, and it is a big if the models such as the European are correct a big Winter like storm may develop across the Panhandle and cross the Southern Plains ushering in even colder air and build a snow cover across the Plains. If that happens, then much less airmass modification is a possibility. The guidance is suggesting another stronger Arctic front following this energy, so we have a lot of moving parts to follow on our weather plate and should lead to some interesting discussions as next week unfolds.
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