Quick update this morning regarding our sensible weather pattern extending into the MLK Holiday period. The Arctic Oscillation (AO) continues to tank nearing -4 while the Pacific North American (PNA) is holding steady near a +2, but is expected to increase to near +4. The North Atlantic Oscillation (NAO) is near -1 while the East Pacific Oscillation (EPO) is near neutral. The MJO is in Phase 8 suggesting that tropical convection East of the Dateline will move toward Mexico/The Caribbean Sea during the upcoming week. The upper air pattern suggests both Northern and Southern stream activity that may attempt to phase or connect which leads to considerable sensible weather forecast volatility beyond Day 4. Midweek should bring increasing rain chances as a disturbance rides SE out of Southern California toward the Texas Gulf Coast and quickly moves NE. A secondary and potentially stronger disturbance that the guidance is struggling to resolve will organize Friday somewhere near the Panhandle ushering in colder air across the Region during the upcoming weekend. The ensembles are hinting of a trailing upper trough behind that feature that digs well to our SW into Mexico. The 12Z GFS 500mb/850mb schemes suggest an upper air disturbance digs well S of the Big Bend across Central Texas with a Coastal low/wave developing after the cold air is established at the surface. There is ensemble support from the European EPS as well as the NAEFS for this potential, so it will be worth monitoring. While it is way to soon to accurately forecast what our sensible weather may bring beyond the 4 to 5 period, it will be interesting to see if the cold surface temperatures suggested in the Medium/Longer Range do indeed verify with a storm organizing over our Region.
01102016 AO ao_sprd2.gif
01102016 tele indices 4panel.png
01102016 MJO twc_globe_mjo_vp200.png
01102016 12Z GFS 198 gfs_z500_vort_us_34.png
01102016 12Z GFS 204 gfs_z500_vort_us_35.png
01102016 12Z GFS 198 gfs_mslp_wind_us_34.png
01102016 12Z GFS 204 gfs_mslp_pcpn_frzn_us_34.png
01102016 12Z GFS 222 gfs_asnow_scus_38.png
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