Barometric Pressure Forecast for Harrow, United Kingdom
Barometric pressure forecast for Harrow, United Kingdom — a northwest London borough on the London Clay, exposed to the full run of Atlantic depressions that cross Britain each winter. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Harrow
Harrow lies in outer northwest London, where Harrow-on-the-Hill rises as a wooded knoll above an otherwise gently undulating plain of London Clay. It is far enough from the centre to escape the worst of the urban heat island yet close enough to feel it, particularly on still winter nights. Britain sits under the exit of the North Atlantic storm track, and that single fact dominates barometric pressure here. Depressions form off Newfoundland, deepen along the polar front jet and arrive over the British Isles having sometimes undergone explosive deepening in mid-ocean. When the North Atlantic Oscillation is in its positive phase the jet is strong and aimed at the UK, and the barometer can run through a full cycle of steep fall, sharp trough passage and rapid recovery every two or three days from October to February. In the negative phase, blocking anticyclones set up over Scandinavia or Greenland, the storm track diverts, and pressure can hold high and almost unchanging for a fortnight while cold continental air drifts in from the east. Summer brings weaker gradients and occasional thundery breakdowns of a heatwave. A barometric pressure forecast for Harrow is most useful across the autumn and winter storm season.
What this means for you
Can barometric pressure cause headaches? In London the barometer is rarely still for long between October and March, and many weather-sensitive people find they react less to any single storm than to the relentless cycling of one depression after another. Keep the barometric pressure forecast open in Pressure Pal, use it as a headache tracking app, and see whether your weather migraine days line up with the trough passages or with the recovery that follows.