1.4 - Hazard fieldwork: weather diaries and risk maps
Apply 1.4 fieldwork to the physical processes of an extreme-weather event. Learn to plan safe observations, record a weather diary and map local hazards without exposing yourself to the conditions being studied.
An event-scale weather enquiry
Weather is the atmosphere's condition at a particular place and time. An extreme event is unusual in intensity, duration or impact for its setting. A passing low-pressure system may bring changing pressure, wind and rainfall, but the timing varies between events and locations. A suitable question is “How did local weather conditions and mapped exposure vary as this event passed?”—not “Did this single storm prove climate change?”
Plan the seven enquiry stages before observing. Record a safe location, time interval, instruments, units and procedure. A hypothesis might predict falling pressure before stronger winds, but it must be tested, not treated as a timetable. Systematic time intervals allow comparison; continuous automatic logging can capture peaks missed between manual observations. Safe sheltered/remote observations and approved archived evidence take priority over completing a timetable outdoors.
Use a local weather-station feed and a distinct second secondary source, such as an official event account or local dated report. Archive the values used, including time zone, location and observation interval. Two different websites reproducing the same station record do not provide independent confirmation. The enquiry concerns extreme weather: field visits to an active volcano or an earthquake-damaged site are not required by this option.
Recording the weather diary
A diary records wind, rain, temperature and air pressure with date/time, units and exposure conditions. Use a consistent procedure and note missed or suspect readings rather than inventing values.
| Variable | Suitable instrument/record | Consistency and limitation |
|---|---|---|
| Wind speed/direction | Anemometer and wind vane, or approved automatic feed | Record observing height/exposure, average versus gust, and direction from which wind comes. Buildings shelter or funnel flow. |
| Rainfall | Rain gauge total over a stated interval | Use a level, suitably exposed position; buildings/trees can obstruct rain. Empty/read consistently where the method requires it. |
| Air temperature | Thermometer or electronic sensor | Use a consistent shaded, ventilated exposure; direct sunshine can heat the instrument above air temperature. |
| Air pressure | Barometer or automatic record | Record hPa and whether pressure is local station pressure or adjusted to sea level; compare like with like. |
Professional Met Office stations use standard exposures and heights; a safe school sensor may not match them. This does not make a school reading useless, but the difference matters when comparing records. Use repeated observations or checked automatic instruments to examine variation. Calibrate/check equipment where possible; identical repeated errors remain errors.
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