TrameaĬarolina Saddlebags ( Tramea carolina) | exuvia (anal pyramid) Pantalaġ2b – Superior abdominal appendage ( epiproct) shorter than inferiors. 37, Key to the Genera of the Family Libellulidaeġ2a – Superior abdominal appendage ( epiproct) as long as, or longer than inferiors. The following couplet from Identification Keys to Northeastern Anisoptera Larvae, compiled by Ken Soltesz, can be used to differentiate exuvia from Genus Pantala and Genus Tramea. For example, when I see an exuvia with long “tail fins,” my first thought is it’s probably from one of two genera, possibly three: genus Pantala genus Tramea or maybe genus Celithemis. Anyway, pattern recognition can be used to make it a little easier to identify exuviae. Some odonate exuviae/larvae remind me of the tail fins on my father’s Plymouth automobile. Big tail fins! My best guess is the car was a four-door Plymouth Fury, sold from 1957 – 1960. I don’t remember many details about the car other than it was a sky blue Plymouth with tail fins. My family was poor, although I didn’t realize it when I was a young boy. Sometime during the late 1950s or early 1960s, my father bought a new car. More RadarScope-specific resources are available from the creators of the app.Ĭopyright © 2023 Walter Sanford. The following resources from the National Weather Service provide excellent background information about Doppler weather radar. Later the same day, a small F0 tornado touched down briefly in Montgomery County, Maryland. In contrast, if the warning area were located to the northeast of the radar site, then the reds would be on the right and the greens on the left.Īs it turns out, there were’nt any official Tornado Reports for Virginia. In the example shown above the greens are on the right and the reds are on the left because the warning area is located to the southwest of KWLX. It’s important to note that the orientation of side-by-side greens and reds typical of rotating thunderstorm cells varies depending upon the location of the storm cell relative to the weather radar site. The large cell produced heavy rainfall, as indicated by the red radar echoes and green polygon that outlines an area where a flash flood warning was issued.Ĭlick on the following image to see a full-screen view of the animated GIF. Notice the intense thunderstorm located to the northwest of the blue reticle that marks my location. Source Credit: Glossary, NOAA National Weather Service. New thunderstorms often develop along outflow boundaries, especially near the point of intersection with another boundary (cold front, dry line, another outflow boundary, etc.
Outflow boundaries may persist for 24 hours or more after the thunderstorms that generated them dissipate, and may travel hundreds of miles from their area of origin. Sometimes the downdraft causes an “outflow boundary.”Ī storm-scale or mesoscale boundary separating thunderstorm-cooled air (outflow) from the surrounding air similar in effect to a cold front, with passage marked by a wind shift and usually a drop in temperature. A simple conceptual model of a thunderstorm includes an updraft and downdraft.
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