Prediction and Diagnosis of Tropical Cyclone Formation in an NWP System....

Journal of the Atmospheric Sciences;  December 1, 2006 ;     700+ words ......stretching and vertical advection of absolute vorticity in convective updraft regions) was...stretching and vertical advection of absolute vorticity within the updrafts of intense bursts...of low- to midlevel tropospheric absolute vorticity by this enhanced circulation intensified...

A scale-discriminating vorticity budget for a mesoscale vortex in a...

Journal of the Atmospheric Sciences;  March 15, 2003 ;     700+ words ......responsible. Convergence of absolute vorticity by the mesoscale wind was...horizontal advection of absolute vorticity, (b) vertical advection...vorticity, (c) convergence of absolute vorticity, (d) tilting of horizontal...

vorticity

A Dictionary of Weather;      108 words ......vorticity) is defined in a system of coordinates that is fixed to the surface, and includes curvature and wind shear . Absolute vorticity takes the rotation of the Earth into account and is thus zero at the Equator and reaches a maximum at the poles. By convention...

cyclone

A Dictionary of Geography;      117 words ......anticlockwise in the Northern, and clockwise in the Southern, Hemisphere. As air near ground level flows into a cyclone, its absolute vorticity increases, and it is therefore subject to horizontal convergence ; this infers the ascent of air. This rising causes cooling...

The weak temperature gradient approximation and balanced tropical moisture...

Journal of the Atmospheric Sciences;  December 1, 2001 ;     700+ words ......divergence. In the presence of background absolute vorticity, this divergence in turn drives a large...vortex stretching and horizontal advection of absolute vorticity. Though atmospheric water vapor is not conserved...

Banded Convection Caused by Frontogenesis in a Conditionally,...

Monthly Weather Review;  June 1, 2007 ;     700+ words ......is warranted on calculating highly derived fields like absolute vorticity and potential vorticity (PV) using RLIC output. Given...he faithfully reproduced. But, if an area of negative absolute vorticity several hundred kilometers in horizontal scale is present...

Evolution of slantwise vertical motions in NCEP's mesoscale eta model

Monthly Weather Review;  January 1, 1999 ;     700+ words ......a subgeostrophic momentum anomaly aloft, with negative absolute vorticity on the baroclinically cool side of the momentum anomaly...of 100 km. Seltzer et al. (1985) utilized geostrophic absolute vorticity from a low (vertical and horizontal) resolution analysis...

anticyclone

A Dictionary of Geography;      399 words ......Northern Hemisphere, and anticlockwise in the Southern Hemisphere. As air near ground level flows into an anticyclone, its absolute vorticity decreases , and it is therefore subject to divergence ; this infers the descent of air. Anticyclones appear on weather...

Cold-frontal potential vorticity maxima, the low-level jet, and moisture...

Monthly Weather Review;  January 1, 2002 ;     700+ words ......maximum heating. The nonadvective PV flux is directed opposite the absolute vorticity vector; therefore vertical wind shear (associated with westwardtilting absolute vorticity vectors) led to eastward nonadvective propagation of the PV maximum...

Why Do Baroclinic Waves Tilt Poleward with Height?*

Journal of the Atmospheric Sciences;  June 15, 2004 ;     700+ words ......with a slope that is parallel to the absolute vorticity vector, while total (geostrophic...twice this slope. The slope of the absolute vorticity vector is approximately equal to...1^ to calculate the slope of the absolute vorticity vector as U/Hf [asymptotically...

Comments on "A generalization of Bernoulli's theorem" / Reply

Journal of the Atmospheric Sciences;  August 15, 2003 ;     700+ words ......potential vorticity (PV), J is the flux of PVS, [omega] is absolute vorticity, and [theta] is potential temperature. Haynes and McIntyre...for PVS can be obtained from the definitions of PVS and absolute vorticity, plus vector identities as follows: ... (1) Here, v is...

Statistical Differences of Quasigeostrophic Variables, Stability, and...

Monthly Weather Review;  June 1, 2007 ;     700+ words ......track. Six diagnostic variables were computed to facilitate the comparison of the storm tracks: differential geostrophic absolute vorticity advection, temperature advection, Q-vector divergence, mean layer specific humidity, low-level stability, and midlevel...

Spurious Grid-Scale Precipitation in the North American Regional...

Monthly Weather Review;  June 1, 2007 ;     700+ words ......relative humidity and precipitable water), mid- and upper-level equivalent potential temperature, and mid- and upper-level absolute vorticity. SGSP events in environments favorable for high-based convection can also feature low-level cold pools and sea level pressure...

Interactions between Simulated Tropical Cyclones and an Environment with a...

Monthly Weather Review;  May 1, 2007 ;     700+ words ......develops over the storm center as a result of an interaction between the primary circulation of the storm and the gradient in absolute vorticity. As a result, the variable-f storm quickly develops a persistent wavenumber-1 asymmetry in its inner-core structure with...

Prediction and Diagnosis of Tropical Cyclone Formation in an NWP System....

Journal of the Atmospheric Sciences;  December 1, 2006 ;     700+ words ......TC-LAPS. The primary vortex enhancement mechanism in TC-LAPS is found to be convergence/stretching and vertical advection of absolute vorticity in deep intense updrafts, which result in deep vortex cores of 60-100 km in diameter (the minimum resolvable scale is...