Search Results

You are looking at 1 - 7 of 7 items for :

  • Boundary currents x
  • Pictures of the Month in Monthly Weather Review x
  • All content x
Clear All
Bradley M. Muller, Christopher G. Herbster, and Frederick R. Mosher

observational studies indicate that these eddies result from complex interactions between a strong boundary layer–topping marine inversion, inversion-penetrating terrain, synoptic-scale wind and pressure fields, nighttime drainage flows, and daytime/nighttime wind reversals produced by diurnal radiative cycles. The smaller borderline meso-gamma/meso-beta-scale eddy photographed and investigated in the current research appears to be a mechanically driven transient feature [see the discussion by Hubert and

Full access
Brandon J. Vogt and Stephen J. Hodanish

large valley regions surrounded by mountains show noticeable minimums in lightning activity. The purpose of the current paper is to demonstrate that a set of geospatial analytical tools can be used to build upon the Hodanish and Wolyn (2011) findings and ultimately create a high-resolution statewide lightning climatology. Advantages of our approach lie in the opportunity to visually explore vast datasets in map form, a research format that facilitates visual thinking ( MacEachren et al. 2004

Full access
Ernani de Lima Nascimento, Gerhard Held, and Ana Maria Gomes

57.5 dB Z . It is not clear what caused the storm intensification in that stage, but interaction with local mesoscale boundaries is one possibility ( Markowski et al. 1998a ; Atkins et al. 1999 ). The discrete storm trailed behind previous convective activity in the form of multicells (not shown) that may have produced outflow boundaries not detected by the available low-resolution surface data and satellite imagery. In addition, the Tietê River valley, along which the storm moved during most of

Full access
Eric A. Hendricks, Brian D. McNoldy, and Wayne H. Schubert

from the U.S. Air Force WC-130J reconnaissance aircraft on 23 Jul. (b) Flight-level winds and relative vorticity from inner region of leg 1. (c) As in (b), but for leg 2. (d) As in (c), but for leg 3. Legs are centered on the recorded minimum wind speed by the WC-130J aircraft, and radii increase outward from the center. In computing the relative vorticity, it was assumed that the winds measured on the flight legs were mostly tangential since the aircraft flew above the boundary layer directly

Full access
John P. Monteverdi, Roger Edwards, and Gregory J. Stumpf

Regional Reanalysis (NARR; Kalnay et al. 1996 ). The current version of the NARR runs at a resolution of 32 km, allowing the authors to reconstruct many of the standard fields used in synoptic interpretation. The authors were also able to retrieve output from the 12-km mesoscale version of the hydrostatic Eta Model (hereafter Meso-Eta) ( Black 1994 ) to reconstruct some of the fields with greater resolution. 3. Proximity sounding and hodograph a. Sounding A difficult task was establishing the

Full access
Bryce J. Weinand

. 5 , was able to record the vertical profile in the area close to where the eddies originated. This area of formation is apparent in the water vapor image as the darker filament extending from central South Dakota southwest into Colorado ( Fig. 1 ). One striking feature of the sounding is that there is weak vertical wind shear present above the planetary boundary layer. There is also a very distinct inversion between 650 and 600 mb where the dewpoint decreases sharply. This is characteristic of

Full access
Werner Alpers, Andrei Yu. Ivanov, and Knut-Frode Dagestad

eddy was formed by a boundary trough of the synoptic-scale low. When it moved over the Black Sea it encountered a high sea surface temperature (26°–27°C), which probably contributed to the formation of the eddy. Fig . 6. As in Fig. 5 , but valid at 1200 UTC 12 Sep 2010. Fig . 7. As in Fig. 5 , but valid at 1800 UTC 12 Sep 2010. 4. The foehn wind Foehn winds are warm winds encountered on the lee side of mountain ridges due to the downward movement of airflow. They are associated with an increase

Full access