We use ERA-Interim data to generate and examine Hovmoller diagrams of the 250-hPa meridional wind
during several periods with particularly persistent surface weather, and find a common pattern among them.
Conventional observations assimilated into the HIRLAM 3DVAR system, where z is geopotential height, u is zonal wind component, v is meridional wind
component, T is temperature, and q is specific humidity Observation type Parameters assimilated Surface SYNOP z SHIP z DRIBU z Upper air TEMP u, v, T, q AIREP u, v, T PILOT u, v Table 3.
During the second and especially in the third perturbed integrated year, the SBB local southward meridional wind
stress component increased, and as a consequence, it is possible to observe the occurrence of positive anomaly OKE values in the SBB region.
Figure 11 shows an example of vertical wave number spectra for the zonal and meridional wind
velocity components observed by the MU radar.
To investigate this we carry out same analysis on the meridional winds
. We note that the damping factors show somewhat better relation with the meridional wind
The bias of the meridional wind
component at Tallinnamadal is negligible, but there seems to be a certain problem with its numerical reproduction at Kalbadagrund.
A figure, based on the Swarztrauber and Kasahara (1985) code, showing the latitudinal dependence of NMRHW zonal wind, meridional wind
, and geopotential is included in the online supplemental material (see https://doi.org/10.1175/BAMS-D-17-0293.2).
stress has a large annual cycle with equatorward values peaking from December to February, then falling rapidly in March to negative values in June (Figure 1(c)).
Average daily cycle of (a) wind speed, (b) wind direction, (c) potential temperature, and (d) specific humidity at the different heights for days with a northerly meridional wind
component during the entire period.
Many researchers have tried to find a possible association of different meteorological parameters with rainfall, such as temperature ; geopotential height at 850 mb ; relative humidity at 700 mb; specific humidity; perceptible water, zonal, and vertical components of wind velocity ; meridional wind
; 850mb zonal wind gradient anomaly ; wet day frequency; minimum and maximum temperature; and cloud cover .
The SSTa tendency has maximum correlations with meridional wind
stress off the coasts of California and Baja California, from -130[degrees] to 140[degrees]W (Fig.
To further explain the relationship between the precipitation increase and the mid- to low-level wind field changes, we compared the meridional wind
speed at the time of the precipitation intensification (23:00 on the 27th) with that of the previous hour (22:00).