Low-pressure area area of wind divergence aloft occurs ahead of embedded shortwave troughs, which are of smaller wavelength. Diverging winds aloft ahead of these troughs cause atmospheric lift within the troposphere below, which lowers surface pressures as upward motion partially counteracts the force of gravity. Thermal lows form due to localized heating caused by greater sunshine over deserts and other land masses. Since localized areas of warm air are less dense than their surroundings, this warmer air rises, which lowers atmospheric pressure near that portion of the Earth's surface. Large-scale thermal lows over continents help drive monsoon circulations. Low-pressure areas can also
High Pressure Low High Pressure Low "High Pressure Low" is the third single from Against Me!'s fifth studio album "White Crosses", released as a 7" vinyl single on December 21, 2010 on Sabot Productions. Following the recording their fifth studio album, White Crosses, Against Me! recorded acoustic versions of songs written for the album in February 2010. An acoustic version of "High Pressure Low" was known to be recorded following lead singer Laura Jane Grace's video posts regarding the acoustic sessions. Grace performed the b-side, "Strip Mall Parking Lots" as early as her 2008 solo tour, then thought to be called "Southwest Florida