Overview
- A strong upper‑level ridge is keeping much of the U.S. dry and unseasonably mild through midweek while multiple low‑pressure systems prepare to erode that ridge.
- Southern California is forecast to see measurable rain midweek (Wednesday–Thursday) with National Weather Service guidance of roughly 0.75–1 inch typical and up to 2 inches on foothills or coastal slopes and a small chance of thunderstorms.
- Arizona faces a Flood Watch for midweek with a risk of heavy, moisture‑rich storms, rain rates up to 1–2 inches per hour in places, flash flooding of washes and low spots, and isolated severe storms including large hail and damaging winds.
- An offshore nor’easter over the Gulf Stream is being monitored by the National Hurricane Center with about a 40% chance of subtropical development and is already producing high surf, dangerous rip currents, gusty northeast winds and localized tidal flooding along parts of the East Coast.
- Local beach, marine and flood advisories are in effect across multiple regions and forecasters urge people to follow NWS/NHC updates, avoid flooded roads, and steer clear of the ocean during high surf and rip‑current threats.