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 today through 8 am tomorrow (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
1Mexico City, Mexico0.59 inHg2 pm10 pm-0.074 inHg/hr
2Denver, Colorado0.46 inHg3 pm10 pm-0.066 inHg/hr
3Albuquerque, New Mexico0.43 inHg3 pm11 pm-0.054 inHg/hr
4Guadalajara, Mexico0.43 inHg3 pm10 pm-0.061 inHg/hr
5Canberra, Australia0.42 inHg1 pm6 am tomorrow-0.025 inHg/hr
6Hobart, Australia0.41 inHg9 am6 am tomorrow-0.020 inHg/hr
7Cheyenne, Wyoming0.4 inHg3 pm10 pm-0.057 inHg/hr
8Sydney, Australia0.4 inHg1 pm7 am tomorrow-0.022 inHg/hr
9El Paso, Texas0.39 inHg4 pm11 pm-0.056 inHg/hr
10Johannesburg, South Africa0.39 inHg8 am2 pm-0.065 inHg/hr
11Adelaide, Australia0.37 inHg11 am6 am tomorrow-0.019 inHg/hr
12Darwin, Australia0.37 inHg2 pm6 am tomorrow-0.023 inHg/hr
13Lagos, Nigeria0.37 inHg9 am3 pm-0.062 inHg/hr
14Jakarta, Indonesia0.36 inHg1 am tomorrow7 am tomorrow-0.060 inHg/hr
15Melbourne, Australia0.35 inHg11 am7 am tomorrow-0.017 inHg/hr
16Lubbock, Texas0.35 inHg3 pm10 pm-0.050 inHg/hr
17Durban, South Africa0.34 inHg8 am7 am tomorrow-0.015 inHg/hr
18Hanoi, Vietnam0.34 inHg3 pm7 am tomorrow-0.021 inHg/hr
19Tucson, Arizona0.34 inHg3 pm11 pm-0.043 inHg/hr
20Davao City, Philippines0.33 inHg1 pm7 am tomorrow-0.018 inHg/hr
= drop began before recorded 24-hour period (8 am today)
= drop continues beyond recorded 24-hour period (8 am tomorrow)

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.