![]() We can see the weak cold front has pretty much dissipated just 15 hours later and the trough aloft over Louisiana, Arkansas, and now Missouri has helped lift some moist air up into the atmosphere to create some light precipitation. This 12hr forecast above is an outlook just about 15 hours from the first chart (surface analysis chart) we talked about at the top of this page. 3-7 day forecasts is issued once daily ~1400Z with a Valid time at 1200Z.36hr, 48hr, and 60hr forecast are issued twice daily.12hr and 24hr forecast Issued every 4hrs.The Prog Chart is really just a surface analysis chart with predicted precipitation added as an overlay (oh, and it is a forecast too, not an observation). We can see the tight spacing on the isobars over North and South Dakota, and as such with a strong pressure change over a short distance I would expect some windy conditions in that area. Given the cold front is not well organized, not moving quickly, and that it is the middle of November and there is not much moisture in the air, I wouldn’t expect too severe of weather to be popping up along that line. We also see a weakly organized cold front meeting a warm front that stretches from Texas up into the North East US. Currently, we see a trough over Louisiana, Oklahoma, and the Arkansas area. What we do want to talk about is the weather picture that is being painted here for us currently and looking 48 hours out as we proceed through the TOPIC. We obviously have a handy legend of symbols right under the chart, so we won’t waste too much time talking about the individual markings. Isobar lines are space 4 millibars apart.(location of frontal lines and types of fronts) ![]()
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