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Moving Through December - Changing Patterns and Changing Diapers


ChrisM

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Do you actually have to see a storm for it to be favorable? This was just yesterday, btw.

http://raleighwx.ame...htAnomalyNH.gif

Favorable height anomoly charts at day 10-15 are a dime a dozen. The error is so large as to render them almost useless as harbingers of snow. Sure they have some utility in forecasting temperature and precipitation anomolies, but even if a favorable regime arrives as predicted (questionable), there is no way to predict rain, snow, or dry.

Day 10 temperature progs are scarcely better than climo, esp near the Atlantic at our latitude. If you look that far out for snow it will always feel two weeks away and/or you will miss the mid-range threats that pop up without long range warning. It is just not an effective way to make a synoptic forecast. Sure it is fashionable, but that doesn't make it useful. I want to see a threat on the mid-range guidance (at least 300mb and 500mb), not the long range anomoly charts to get excited. Otherwise the rug will get pulled out from under. Just look at the 10 day ensemble spaghetti plots. They are like children's crayon drawings. 10 days of error progatation is enough to create a spread in the 558dm height contour from Maine to the tropics.

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Favorable anomoly charts at day 10-15 are a dime a dozen. The error is so large as to render them almost useless as harbingers of snow. Sure they have some utility in forecasting temperature and precipitation anomolies, but even if a favorable regime arrives as predicted (questionable), there is no way to predict rain, snow, or dry.

Day 10 temperature progs are scarcely better than climo, esp near the Atlantic at our latitude. If you look that far out for snow it will always feel two weeks away and/or you will miss the mid-range threats that pop up without long range warning. It is just not an effective way to make a synoptic forecast. Sure it is fashionable, but that doesn't make it useful. I want to see a threat on the mid-range guidance (at least 300mb and 500mb), not the long range anomoly charts to get excited. Otherwise the rug will get pulled out from under. Just look at the 10 day ensemble spaghetti plots. They are like children's crayon drawings. 10 days of error progatation is enough to create a spread in the 558dm height contour from Maine to the tropics.

i think you're going to get a lot of disagreement from most of the GOOD mets on here. Some with violence. You may have opened up Pandoras box
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