The winter 2019-2021 season in Baja was atypical in a number of ways.
It started off with a bang in November but from that point on the winds were often unreliable unless you were on foils or big kites or sail. Or if you were there during one of the few strong wind periods.
But the main anomaly was the source of the northerly winds. Typically much of the wind comes from high pressure in the Great Basin or ideally 4 corners area of the western USA. This wind streams towards the persistent low pressure trough south of Baja. Then this N to NNE winds curves into the beaches at places like La Ventana and Los Barriles that have a warm valley inland.
But often this year the Great Basin was devoid of high pressure so we often lost that wind machine. But weirdly the North Pacific High as unusually large and atypically in a more northern location much of this winter. And this often brought solid NW wind to Baja’s Pacific side and NNW winds to the Sea of Cortez.
Unfortunately, NNW winds are at a more unfavorable angle to the La Ventana and Los Barriles and especially the El Sargento beaches. Plus some of this wind can is west enough to come down the arroyos creating weak offshore W. winds at the beaches making for unreliable wind inside. Still, any wind was welcome this season and we became to learn the routine: Strong NW wind on the Pacific side of Baja means somewhat unreliable but welcome wind for the El Sargento to Los Barriles corridor. 
Until….. it doesn’t. If the models are right later this week a resurgent North Pacific High brings strong NW winds to Southern California and the entire Pacific side of Baja.
Looking at this animation you can see the North Pacific High and those strong NW winds. But notice how weak the winds are in the Sea of Cortez.
Now notice the huge low pressure in the Great Basin. This is the area where we need HIGH PRESSURE to created classic El Norte winds for Baja.
Now notice how the North Pacific High curve towards the Great Basin low pressure rather than building down the length of the Sea of Cortez. Hence the exception to rule about NW wind on Baja’s Pacific side and a windy Sea of Cortez for the El Sargento to Los Barriles corridor.