Cities with Greatest Drop in Barometric Pressure


The following cities are experiencing the biggest drops in barometric pressure today among our tracked cities. This is determined by finding the widest range between the highest and lowest pressures during the 24-hour period starting and ending at midnight, UTC−08:00 (Pacific Standard Time) in each city and filtering for the cities where the time of the highest pressure precedes the time of the lowest pressure.

Because each reading represents a 24-hour window of an hourly weather forecast, from 8 am yesterday through 8 am today (local time), it is possible that the full range of the falling pressure pattern is not captured in the data. In this case, the green triangle () indicates that the highest pressure observed during this period was at the start, meaning that the pressure had likely fallen from a higher high. Conversely, the red inverted triangle () indicates that the lowest pressure forecasted during this period is at the end, meaning that the pressure will likely continue to fall beyond the lower end of the range observed. Therefore, red and/or green triangles indicate that the total drop is likely to be greater than the amount displayed.


#CityDecreaseHigh TimeLow TimeRate
1Reykjavik, Iceland0.59 inHg8 am yesterday7 am-0.026 inHg/hr
2Bogota, Colombia0.42 inHg12 pm yesterday8 pm yesterday-0.052 inHg/hr
3Cape Town, South Africa0.41 inHg8 am yesterday7 am-0.018 inHg/hr
4St George, Utah0.39 inHg3 pm yesterday1 am-0.039 inHg/hr
5Addis Ababa, Ethiopia0.39 inHg8 am yesterday2 pm yesterday-0.065 inHg/hr
6Djalo, Democratic Republic of the Congo0.39 inHg8 am yesterday3 pm yesterday-0.056 inHg/hr
7Albuquerque, New Mexico0.38 inHg3 pm yesterday10 pm yesterday-0.054 inHg/hr
8Las Vegas, Nevada0.37 inHg4 pm yesterday1 am-0.041 inHg/hr
9El Paso, Texas0.35 inHg3 pm yesterday12 am-0.039 inHg/hr
10Tucson, Arizona0.35 inHg3 pm yesterday12 am-0.039 inHg/hr
11Phoenix, Arizona0.34 inHg3 pm yesterday1 am-0.034 inHg/hr
12Perth, Australia0.33 inHg8 am yesterday7 am-0.014 inHg/hr
13Dar es Salaam, Tanzania0.3 inHg8 am yesterday1 pm yesterday-0.060 inHg/hr
14São Paulo, Brazil0.3 inHg12 pm yesterday7 pm yesterday-0.043 inHg/hr
15Lagos, Nigeria0.3 inHg9 am yesterday3 pm yesterday-0.050 inHg/hr
16San Antonio, Texas0.29 inHg2 pm yesterday11 pm yesterday-0.032 inHg/hr
17Monterrey, Mexico0.29 inHg3 pm yesterday12 am-0.032 inHg/hr
18Cairns, Australia0.29 inHg11 pm yesterday5 am-0.048 inHg/hr
19Austin, Texas0.29 inHg2 pm yesterday11 pm yesterday-0.032 inHg/hr
20Mcallen, Texas0.28 inHg3 pm yesterday12 am-0.031 inHg/hr
Legend:
= drop began before recorded 24-hour period (8 am yesterday)
= drop continues beyond recorded 24-hour period (8 am today)




The change and rate of change in barometric pressure is often seen as being more important than the actual pressure value. That is why on many digital barometric pressure displays, the pressure readings are accompanied by “rising” or “falling” indicators. In meteorology, falling pressure is usually a sign of worsening weather, such as an incoming storm, increasing winds, more clouds, or more precipitation.

To folks who experience migraines, joint pain, or other physical conditions that are sensitive to pressure changes, falling pressure typically feels worse than rising pressure, though changes in pressure affect people differently, and stable pressure is generally preferred to larger or more rapid changes in pressure.