Hey guys. How can I tell when an upper level trough is present. Can I do this by looking at the shear charts?
http://forecasts.bsch.au.com/stormcast. ... #stormcast" onclick="window.open(this.href);return false;
Cheers.
.There's many out there but a couple include the Stormcast maps on the BSCH site (http://forecasts.bsch.au.com/stormcast.html" onclick="window.open(this.href);return false;) - mid/upper troughs typically show up on the upper wind charts (the "Shear" charts between around 700 and 300hpa... although they're actually only show the winds at those heights rather than true shear within a layer of atmosphere) like they do on surface wind charts.
Another one is the map viewer based on the ACCESS model at:
http://www.bom.gov.au/australia/charts/ ... u&model=CG" onclick="window.open(this.href);return false; - again, the same principle as above applies. Mid level cold air shows up on the 700 and 500hpa temperature charts on both sites while jetstreams can be identified on the 300hpa wind charts as ribbons and streaks of strong winds. Severe thunderstorms often occur under the left entrance and right exit regions of jet streaks provided there's also enough moisture and instability.