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Feb 22/23 - Discussion and Obs for a mixed bag event


MN Transplant

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Meh because not a lot of precip at the surface, learn the lesson though I'm sure you're probably joking. I'm thinking we'll get .1 QPF at least, maybe a bit more in the end. 

 

Looking dicey. I blame MN for the thread. Euro still gets us a couple tenths of rain with the coastal though so we have that working for us. 

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For what it's worth, a WWA just got posted for part of SW PA.

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE STATE COLLEGE PA

253 PM EST THU FEB 21 2013

PAZ024-025-033-034-221215-

/O.NEW.KCTP.WW.Y.0012.130222T1300Z-130223T1500Z/

CAMBRIA-BLAIR-SOMERSET-BEDFORD-

INCLUDING THE CITIES OF...JOHNSTOWN...ALTOONA...SOMERSET...

BEDFORD

253 PM EST THU FEB 21 2013

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 AM FRIDAY TO 10 AM

EST SATURDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER

WEATHER ADVISORY FOR A LIGHT WINTRY MIX...WHICH IS IN EFFECT FROM

8 AM FRIDAY TO 10 AM EST SATURDAY.

* LOCATIONS...LAUREL HIGHLANDS AND SOUTH-CENTRAL MOUNTAINS.

* HAZARD TYPES...WINTRY MIX OF LIGHT SNOW...SLEET AND FREEZING RAIN.

* SNOW ACCUMULATIONS...UP TO 1 INCH.

* ICE ACCUMULATIONS...LESS THAN ONE TENTH OF AN INCH.

* TIMING...A WINTRY MIX OF LIGHT SNOW AND SLEET WILL START EARLY

FRIDAY MORNING...BEFORE TRANSITIONING TO LIGHT FREEZING RAIN AND

PATCHY FREEZING DRIZZLE FRIDAY NIGHT INTO EARLY SATURDAY MORNING.

* IMPACTS...HAZARDOUS TRAVEL CONDITIONS DUE TO SLICK ROADS AND

REDUCED VISIBILITY.

* WINDS...SOUTHEAST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.

* TEMPERATURES...UPPER 20S TO LOW 30S.

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Agreed Wes, think other models will get wetter and NAM will meet in the middle. 

 

That is a statement I think that is based on history, but there's no real reason for it to be true.  As someone was saying earlier, if a model shows it, it's possible, if not likely.

 

Having said that, the NAM looks pretty good at a glance.

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That is a statement I think that is based on history, but there's no real reason for it to be true.  As someone was saying earlier, if a model shows it, it's possible, if not likely.

 

Having said that, the NAM looks pretty good at a glance.

 

Nam has a .5 stripe through central va. We're getting nam'd again. I wish the nam came out after the gfs. It's much better getting nam'd than gfs'd. 

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For what it's worth, a WWA just got posted for part of SW PA.

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE STATE COLLEGE PA

253 PM EST THU FEB 21 2013

PAZ024-025-033-034-221215-

/O.NEW.KCTP.WW.Y.0012.130222T1300Z-130223T1500Z/

CAMBRIA-BLAIR-SOMERSET-BEDFORD-

INCLUDING THE CITIES OF...JOHNSTOWN...ALTOONA...SOMERSET...

BEDFORD

253 PM EST THU FEB 21 2013

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 AM FRIDAY TO 10 AM

EST SATURDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER

WEATHER ADVISORY FOR A LIGHT WINTRY MIX...WHICH IS IN EFFECT FROM

8 AM FRIDAY TO 10 AM EST SATURDAY.

* LOCATIONS...LAUREL HIGHLANDS AND SOUTH-CENTRAL MOUNTAINS.

* HAZARD TYPES...WINTRY MIX OF LIGHT SNOW...SLEET AND FREEZING RAIN.

* SNOW ACCUMULATIONS...UP TO 1 INCH.

* ICE ACCUMULATIONS...LESS THAN ONE TENTH OF AN INCH.

* TIMING...A WINTRY MIX OF LIGHT SNOW AND SLEET WILL START EARLY

FRIDAY MORNING...BEFORE TRANSITIONING TO LIGHT FREEZING RAIN AND

PATCHY FREEZING DRIZZLE FRIDAY NIGHT INTO EARLY SATURDAY MORNING.

* IMPACTS...HAZARDOUS TRAVEL CONDITIONS DUE TO SLICK ROADS AND

REDUCED VISIBILITY.

* WINDS...SOUTHEAST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.

* TEMPERATURES...UPPER 20S TO LOW 30S.

 

Not sure why we'd care?

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Sleet.  Still, the NAM did not back down precip-wise.

 

 

Look at the soundings at 18 and 00Z, I'm only showing the one at 18Z but they are essentially the same except for the warm layer.  The tricky thing is the depth of the clouds and cloud top temps.  They make it tough call to know what ptype to go with.  Snow or freezing rain at the onset and then sleet or freezing rain 3 hours later. 

 

post-70-0-05654500-1361477746_thumb.gif

 

It may be one of those deals where ptype depends on intensity and how deep the clouds get. 

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I wish the NAM were dependable.       

 

Still trolling us at 33 hours.   But it's hard to bet against the Euro/GFS when they agree.

 

I would say overdone on precip but temps are more likely than euro/gfs. Maybe not quite so cold but closer than the globals. 

 

If you look at 700 the NAM is believable in some ways but we've been down this path before. 

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