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A lee trough, also known as a dynamic trough, is "A pressure trough formed on the lee side of a mountain range in situations where the wind is blowing with a substantial component across the mountain ridge; often seen on United States weather maps east of the Rocky Mountains, and sometimes east of the Appalachians, where it is less pronounced."
The powerful upper-level trough shifted eastward, now encompassing portions of the Ohio River Valley and Northeast in 200 mb winds greater than 100 kn (115 mph; 185 km/h). [11] While a line of pre-frontal convection was ongoing during the early morning hours, this activity was expected to weaken as it encountered stable air across the ...
To the east, a pre-frontal trough also developed along the Blue Ridge Mountains. Mixed-layer CAPE of 1,000-2,500 J/kg and dewpoints in excess of 65 °F (18 °C) across a wide region were forecast to materialize.
A pronounced pressure trough extended northeast of the low and signaled its future track as a prefrontal trough formed southeast of the low ahead of the dry line. A bulge in the dry line may also have been forming slightly south of the low, and southerly to southeasterly surface winds were backing and increasing with time throughout the warm ...
A weaker form of the dry line seen more commonly is the lee trough, which displays weaker differences in moisture. When moisture pools along the boundary during the warm season, it can be the focus of diurnal thunderstorms. [17] The dry line may occur anywhere on earth in regions intermediate between desert areas and warm seas.
A pronounced pressure trough extended northeast of the low and signaled its future track as a prefrontal trough formed southeast of the low ahead of the dry line. A bulge in the dry line may also have been forming slightly south of the low, and southerly to southeasterly surface winds were backing and increasing with time throughout the warm ...
Shortwave trough – Embedded kink within seen in overall troughing patterns. Significant tornado – A substantial tornado, one that is rated F2-F5 or EF2-EF5. Grazulis also includes (E)F0-(E)F1 tornadoes that cause a fatality in his definition for The Tornado Project database.
In the presence of strong wind shear and MLCAPE values of 500-800 J/kg, [16] bands of convection developed across the region, particularly focused along a pre-frontal trough. [17] Tornadic supercells tracked across southeastern Indiana toward the Ohio border over ensuing hours.