![]() ![]() However, they do sometimes show up in high-resolution numerical weather models forecasts, even despite not being in the initial observation data they run from: Generally observation sites are too widely spread out to see the small pressure kinks. Now the kinks in these drawings aren't caused by the actual layout of observation in the image, but added by the understanding of the meteorologist performing the analysis. (for another good example: this set of images from the 1993 Storm of the Century from the National Weather Service). This indicates that the pressure is higher on either side of the front. There's a lot going on in the image, but try to focus on the many black lines, which show pressure: they're kinked around each front (and even the dryline). ![]() Not only are fronts associated with (extratropical) lows, but by in large, fronts are extensions of those lows, as shown by the following hand analysis ( from the US Storm Prediction Center): ![]()
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