Climate Whiplash: From Record Drought to Record Rain in 12 Months

The numbers are striking. The summer of 2025 was the UK's warmest on record. Reservoirs ran low. Soils cracked. Then, starting in October, the rain came — and didn't stop.

Parts of Devon and Cornwall recorded 50 consecutive days of rainfall through winter 2026, one of the wettest seasons in recorded history. By spring, the turnaround was complete: reservoir storage across England reached 95% of capacity, soils fully replenished, river flows normal or above normal across the board.

What Is Climate Whiplash?

Scientists describe "climate whiplash" as rapid, dramatic swings between weather extremes — drought to flood, heat to cold — occurring faster and more frequently as the atmosphere accumulates more energy. The 2022 drought-to-flood sequence was a textbook case. 2025–26 is another.

The mechanism is relatively well understood. A warmer atmosphere holds more moisture, amplifying both wet and dry extremes. Persistent blocking patterns — high pressure systems that park over the UK for weeks at a time — become more common, turning a wet spell into a flood event and a dry spell into a drought.

What It Means for Chasers

For storm chasers, the implications are twofold. First, extreme moisture loading through a wet winter creates conditions where a relatively modest convective trigger in spring can produce outsize results — deep moisture, unstable air, and steep lapse rates. Second, the rapid transition to warm, dry conditions heading into summer raises the risk of flash drought, where soil moisture vanishes quickly under intense heat and sunshine.

Both scenarios favour elevated convective potential through May–July 2026. Watch for setups where cold upper lows interact with the warm, moist boundary layer building off saturated soils — that combination is where UK supercells tend to originate.

The Forecast Horizon

The Met Office's three-month outlook for summer 2026 puts a 40% probability of a hot summer — double the climatological baseline. Early indications suggest drier-than-average conditions for early summer, with an increased risk of extreme heat events. A flash drought is a non-trivial possibility if June and July deliver the forecast warmth without compensating rainfall.

This season is shaping up to be one of the more interesting in recent memory. The ground is primed. The upper atmosphere is increasingly energetic. Keep watching.