Strong Ridge to Drive Mid-June Heatwave Across Pacific Northwest, Northern California as 3 June Lows Fade
Updated
Updated · weatherwest.com · Jun 7
Strong Ridge to Drive Mid-June Heatwave Across Pacific Northwest, Northern California as 3 June Lows Fade
3 articles · Updated · weatherwest.com · Jun 7
Summary
Mid-June forecasts now point to a broad, persistent high-pressure ridge building along or just west of the coast, bringing a sharp turn hotter and drier across the Pacific Northwest and Northern California.
3 late-season low-pressure systems will first keep much of the West Coast cool, breezy and unsettled into early next week, with showers most likely in the Pacific Northwest and lighter spillover possible into far Northern California.
A midweek inside-slider system is then expected to dry California out while kicking up warm north winds in Northern California, raising moderate fire-weather concerns and setting up the pattern shift.
Forecasters see the highest odds of anomalous heat in Washington, Oregon and far Northern California, while a coastwide event remains possible; current guidance does not support a repeat of the record-shattering June 2021 heatwave.
The setup is being tied to an unusually strong, eastward-extended Pacific jet—linked to warm ocean water and developing El Niño conditions—which can amplify downstream ridge-building and still carries placement and intensity uncertainty.