Enter a ZIP code to get a forecast:
Setup Location

WRN Logo

3 hr Pressure Change Contour - -6 hr

Please take our Weather website Usage Survey
Note: This survey is hosted on Survey Monkey servers. Clicking the survey link above will direct you outside our network to the Unisys-approved survey page on the Survey Monkey website. We respect your privacy in accordance with our Privacy Notice.
3 hr Pressure Change Contour - -6 hr
Click On the Image For Full Size.

Contour plot of the change in pressure from the current hour to 3 hours previous for the contiguous US. This is a good indicator of the movement and intensification of pressure systems. If the pressure change is negative in the region of a low pressure system (see above chart), the low is deepening. If the negative pressure change is out in front of the low pressure system, it indicates movement. The location of the maximum pressure drops indicate the possible direction of the low pressure system.