JASMINE

Overview

Radar:

May 1999
Sun	Mon	Tue	Wed	Thu	Fri	Sat
-	-	-	-	-	-	1
2	3	4	5	06	07	08
09	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31	-	-	-	-	-

Each day of the calander contains a table of hourly images from the surveillance scans. You can click on the image to get a larger picture. Images may be missing either because the data do not exist, or because the data are in need of quality control and may or may not be available at a later date. These images are created from preliminary radar data which are currently being processed for quality control. Postings will be made as the data are processed.

The radar images online are described below along with a sample image and a description of how to interpret the display. Questions regarding these images should be sent to Edit-Design Center edc(at)atmos.washington.edu.

Above is a sample image from 4 May 1999, 00 UTC. The colors indicate the radar reflectivity values, with orange and red being the highest values, indicating high rain rates, and green and blue being the lowest values, indicating low rain rates. Both the data from the volume scan for the lowest tilt, and the surveillance scan are shown in most of the images, giving two color bars on the right hand side. If only one color bar is present, it indicates the volume scan was not available for this time. The green range rings are 40 km apart and the radar is located at the center of these rings in every image. The white grid lines are 1 degree in both longitude and latitude.

To view vertical cross-sections of both reflectivity and radial velocity taken on any given day, click on one of six UTC times displayed inside the calendar. An example from 24 May 1999, 16 UTC is shown above. Each page of cross-sections consists of a horizontal reflectivity image at left, a vertical cross-section of reflectivity at upper right, and a vertical cross-section of radial velocity at lower right. At the time of the radar image, the ship is co-located with the radar in the center of the concentric rings. A red line on the reflectivity image traces the ship's path from its present location over the previous ten hours. Radially extending from the radar site on the reflectivity image, a blue line indicates the axis on which both cross-sections were taken. The radar site is always located on the left side of the cross-sections for standardization. Cooler colors on the vertical cross-section of reflectivity indicate lower reflectivities; warmer colors indicate higher reflectivities. For radial velocity, positive values indicate reflectivities moving away from the radar. Negative values indicate reflectivities moving towards the radar. Three criteria were employed for selecting the best axis for cross-sections. One, axes traversing areas of maximum reflectivities generally offer the most reliable data sets. Two, azimuths yielding more spatially complete data sets are favored over azimuths of greater reflectivities with less spatially complete data sets. Three, axes parallel or anti-parallel to the winds enhance cross-sections of radial velocity. To return to the page for the appropriate date, use the "Back" button on your web browser.