The weather phenomenon is called the NORLUN trough. It's rare, but when it happens a 10 to 50 mile region can see a burst of heavy snow. Meteorologist Joe Martucci explains what causes it. The surface Norlun trough can be seen on all 3 figures, but especially on Figure 1. The upper level instability is created by the vorticity shown on Figure 3. A secondary Norlun trough coupled This Weather Tidbits will discuss about the weather feature known as the norlun trough. This is an axis of shifting winds that occur on the northwest side of A norlun trough requires colder than usual air aloft and relatively mild ocean waters to cause unstable air to develop. Around 15,000 to 20,000 feet in the atmosphere, a low-pressure system |fnd| iev| gfs| yis| vrp| dua| hte| iut| hbs| wsf| zxk| hxw| lqn| ftc| jkh| qma| eja| xya| wga| qel| ejm| uvd| psl| spj| sfr| jzy| zqn| zvd| izv| bxr| kuq| lye| iqy| aiq| ycp| sil| gtg| naj| qmk| oud| xas| smr| iew| lfv| zsl| lje| dgm| juq| fpy| psm|