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Map of pressure systems across North America. A pressure system is a peak or lull in the sea level pressure distribution, a feature of synoptic-scale weather.The surface pressure at sea level varies minimally, with the lowest value measured 87 kilopascals (26 inHg) and the highest recorded 108.57 kilopascals (32.06 inHg).
The National Weather Service office in Houston reported broadening sleet and snow showers at 6:45 p.m. CT, adding that they would get more intense overnight and urging motorists to stay off the road.
A polar low is a small-scale, symmetric, short-lived atmospheric low-pressure system (depression) that is found over the ocean areas poleward of the main polar front in both the Northern and Southern Hemispheres. The systems usually have a horizontal length scale of less than 1,000 kilometres (620 mi) and exist for no more than a couple of days.
Mesoscale meteorology studies weather systems like thunderstorm clusters too small to be resolved by the earliest weather observation networks. The earliest networks of weather observations in the late 1800s and early 1900s could detect the movement and evolution of larger, synoptic-scale systems like high and low-pressure areas.
Some climate scientists think a new term for the most extreme weather may be needed because the usual way of characterizing the events fails to capture how they keep getting more dramatic.
Severe weather, in the form of high winds, can be generated by the wake low when the pressure difference between the mesohigh preceding it and the wake low is intense enough. [3] When the squall line is in the process of decay, heat bursts can be generated near the wake low. Once new thunderstorm activity along the squall line concludes, the ...
The Future Trends of Extreme Weather in Texas report looks at future trends through 2036. By that year, it says, the average annual surface temperatures will be 1.8 degrees warmer than it is today ...
In a completely moist troposphere, a temperature decrease with height less than 6 °C (11 °F) per kilometer ascent indicates stability, while greater changes indicate instability. In the range between 6 °C (11 °F) and 9.8 °C (17.6 °F) temperature decrease per kilometer ascent, the term conditionally unstable is used.