What is the lowest pressure ever recorded on Earth and uneven heating of land and water in winter brings little rain in winter?
The lowest atmospheric pressure ever recorded on Earth occurred during Typhoon Tip in the western Pacific Ocean in 1979, where the central pressure dropped to approximately 870 millibars (mb) or 25.69 inches of mercury (inHg). This extreme low-pressure system was associated with a very powerful tropical cyclone (typhoon) and is considered the lowest reliably measured sea-level pressure in recorded history.
Regarding the uneven heating of land and water in winter and its impact on rainfall, it's important to understand how seasonal temperature differences affect weather patterns:
In summary, the uneven heating of land and water surfaces in winter contributes to specific weather patterns characterized by lower rainfall over land areas due to the development of high-pressure systems, limited moisture availability, and the prevalence of cold, dry air masses. These factors collectively influence the type and amount of precipitation observed during the winter season.
The lowest atmospheric pressure, barometric pressure, ever recorded was in 1979 within a typhoon in the Pacific Ocean. The air pressure therein measured at 870 millibars or 25.9 in-Hg (inches of mercury). Average air pressure measures about 29.9 inches or around 1013.25 millibars of pressure. The lowest pressures currently achievable in laboratory are about 1×10−13 torrs (13 pPa). However, pressures as low as 5×10−17 torrs (6.7 fPa) have been indirectly measured in a 4 K (−269.15 °C; −452.47 °F) cryogenic vacuum system. Uneven heating of the land during winter generates winds from colder north western areas. These bring rainfall to Tamil Nadu, parts of Andhra, etc. The uneven heating of land and sea water causes monsoon winds. In summer, land becomes warmer than the sea. This causes winds to flow from sea to land and brings moisture with them. During the day, air above land heats up faster than air above water. The uneven heating of land and sea water causes monsoon winds. In summer, land becomes warmer than the sea. This causes winds to flow from sea to land and brings moisture with them. In winter, the direction of the wind gets reversed and there is hardly any moisture in it.
The lowest recorded air pressure on Earth that we can be sure of was measured at sea level and not inside a tornado. This measurement was incredibly low, at only 870 millibars (mb), which is 25.69 inches of mercury. This record was set on October 12, 1979, during Typhoon Tip in the western Pacific Ocean.
There is some debate about an even lower pressure being measured in a different typhoon, but that value hasn't been officially verified.
As for uneven heating of land and water in winter, that's a big contributor to lower winter precipitation in many places. Here's why:
- Land cools off much faster than water in the fall and winter.
- Colder air holds less moisture, so as the land cools, the air above it dries out.
- This dry air masses then move over the bodies of water, which are still relatively warm.
- The warm water can't transfer much moisture to the dry air, so there's less rain or snow.
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