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Next weeks Storm Threat and DT's Jan 21-22 Facebook threat


Ji

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of course, its the 18z GFS, but the 18z NAM also shows strong CAD looking at the 1000-850 mb map. Ian/Mitch/Wes... do I have this right? What do you guys think?

it's definitely one of the better runs recently if you want some wintry precip. i dunno if it's right. would imply somewhat messy conditions to the northwest with at least the whole night dealing with sub freezing and some precip.

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of course, its the 18z GFS, but the 18z NAM also shows strong CAD looking at the 1000-850 mb map. Ian/Mitch/Wes... do I have this right? What do you guys think?

nam_sl8_084m.gif

you mean the runs on the 6th hour? the 666 runs?

they are satin's runs and you'd be best advised not to look at them :devilsmiley:

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Didn't we have this kind of scenario a few years back in a January? Where we got .1-.2 inches of ice overnight until about mid morning and then it changed over to rain?

I think I remember this. Although - the bigger ones obviously have stuck in my head better (the ones there we got .5-.75 inches of ice.

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18z GFS would imply a long period of frozen precip in Ji's backyard that's for sure....right or wrong that IS what the model is showing right now. Each run starting with last nights 00z has gotten colder at 850 and the surface....who knows if the gfs will be right but to me it is worth watching.

If we were to take this model verbatim (which of course is bad to do)... we could possibly see ice storm warnings for .25" of ice to rain.

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.. but there's a difference between frozen dew and frost. A couple of years ago I went camping with the Scouts. By 10 PM in the evening dew had formed with the temperature around 40 degrees. I assumed the temperature had bottomed out. However, by morning the temperature was in the mid 30's and our tents were covered with hundreds of tiny ice beads. We huddled and decided to pass out "Polar Bear" patches to all the Scouts.

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.. but there's a difference between frozen dew and frost. A couple of years ago I went camping with the Scouts. By 10 PM in the evening dew had formed with the temperature around 40 degrees. I assumed the temperature had bottomed out. However, by morning the temperature was in the mid 30's and our tents were covered with hundreds of tiny ice beads. We huddled and decided to pass out "Polar Bear" patches to all the Scouts.

Yes indeed there is a difference! -

Frost = Gas to a solid

Frozen dew = gas ---> liquid ---> solid

http://www.theweatherprediction.com/kid_weather_questions/dew_frost.html

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.. but there's a difference between frozen dew and frost. A couple of years ago I went camping with the Scouts. By 10 PM in the evening dew had formed with the temperature around 40 degrees. I assumed the temperature had bottomed out. However, by morning the temperature was in the mid 30's and our tents were covered with hundreds of tiny ice beads. We huddled and decided to pass out "Polar Bear" patches to all the Scouts.

Related question (somewhat)--I was camping on Dolly Sods, WV ~15 years ago in late January (yeah, I'm nuts--but Old Man Winter lives up there if you got the cajones) and the pre-dawn morning following a sub-zero night, all of the twigs, branches etc. were covered with the most amazing 1/2 inch thick ultra-delicate frost, which sublimated as soon as the sun came over the horizon--like instantaneously. A lifetime experience if you've ever seen this--but I've always wondered--is that "hoarfrost", or is there a name for it at all?

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