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St. Paddy's Day Storm Obs


nj2va

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good to know! How do they calculate the official precip total?

Here at IAD we measure a running snow total on one board and we measure and wipe clean a 6 hour snow total that goes into observations. Snow also accumulates in the measuring device...which can be rough when its windy. From that device we take the snow that falls inside of the canister and melt it down to liquid...of course you have to measure the warm water you add. From that total measurement we are able to do a calculation and come up with the liquid to snow ratio. Coop observers are trained the same with equipment. From all 3 pieces of equipment you achieve a running snow depth for climo and obs, 6 hrly snow for updates and sn-liquid ratio.

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Sunday early afternoon high: 45.5

Sunday 11:00pm:  29.3

Monday a.m. low:  22.9

 

Monday 8:50am:  23.6 w/very light flurries.

 

While out shoveling, took multiple measurements of between 8" and 10".  So, going w/ 9" IMBY to account for early morning compacting.  Not worth hassling w/fractions at this point.  I'm over 50" now for the season. Suggest shoveling early.  Snow was not as light and fluffy as I expected it to be.

 

Long-range suggests another East Coast event maybe in about a week ? :snowwindow:

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ers-wxman should be around to rightfully gloat any minute now.

;-). I'm pleased how the event took shape. Drawing conclusion that some of the colder wetter solutions were accurate. There are 2 or 3 members of that SREF pack that are very high every storm...by a bunch. We know those members will always ramp the max grid up and we tweak back some to account. For planning and risk assessment it was good to brief the potential for up to xx amount as a range of possible very worst case solutions. Once the event begins the Min and Max maps disappear. We do this because they are for planning purposes only and at that time we should have narrowed the forecast to have the Most Likely graphic as our only confidence...official forecast which may or may not receive a few tweaks based on trends. Two rounds of verification begin after that... Spotter and coop reports for verification/non verification of the warnings and advisories and a new test verification to see how our official forecasts and observed snow amounts placed within the goal post of possibilities.

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