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November Discobs Thread


George BM
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4 minutes ago, MillvilleWx said:

Gotcha. Yes, that corridor along I-95 north of Samford got absolutely blitzed. 40" of snow and 6"/hr rates were reported. I did a case study on that in college for my radar class. It was fascinating. There were reports of soft hail in that band that set up. Some of the greatest frontogenesis you will ever see in a storm bar none. 

What is soft hail?

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1 minute ago, gopper said:

What is soft hail?

Soft hail are basically snow pellets. It's super-cooled water droplets that coalesce and cover a snowflake. The ones from this event accompanied the insanely large flakes that dumped over the region. Graupel is soft hail. It's pretty cool when you look at it closely. It's basically a rimed over snowflake. 

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2 minutes ago, MillvilleWx said:

Soft hail are basically snow pellets. It's super-cooled water droplets that coalesce and cover a snowflake. The ones from this event accompanied the insanely large flakes that dumped over the region. Graupel is soft hail. It's pretty cool when you look at it closely. It's basically a rimed over snowflake. 

Thank you for the explanation.  How large can Soft Hail get?  I know the little styrofoam-like graupel pellets, but can soft hail get large like regular hail?  

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4 minutes ago, gopper said:

Thank you for the explanation.  How large can Soft Hail get?  I know the little styrofoam-like graupel pellets, but can soft hail get large like regular hail?  

North really. Maybe a little bigger than sleet (0.2" or so), but otherwise, they will remain fairly small. A lot of very strong bands within surface frontogenesis near the coasts can have them due to the moisture advection involved. That's why just away from the coast in CT they had it within that mega band. Here's a picture of the radar image during the height of the band.

de94ec_c0f251c93ee04096af7188a445fe038b.webp

 

If you want to talk more about it, send me a PM so we don't clog the obs thread with stuff not here from 2013 lol

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(Source:  NWS LWX)

Rainfall totals continue to creep upward, with Baltimore setting
the annual record already. Here are the current rankings for
wettest year on record (through November 18th):

Washington DC area (DCA)
1. 61.33 inches (1889)
2. 60.83 inches (2003)
3. 60.09 inches (1878)
4. 58.58 inches (2018)
5. 58.17 inches (1886)
Weather records for the Washington DC area have been kept at
what is now Ronald Reagan Washington National Airport (DCA)
since 1945. Precipitation records observed downtown extend the
period of record back to 1871.

Baltimore MD area (BWI)
1. 63.18 inches (2018)
2. 62.66 inches (2003)
3. 62.35 inches (1889)
4. 58.98 inches (1979)
Weather records for the Baltimore MD area have been kept at
what is now Baltimore-Washington International Thurgood Marshall
Airport (BWI) since 1950. Precipitation records observed
downtown extend the period of record back to 1871.

Dulles VA area (IAD)
1. 65.67 inches (2003)
2. 59.17 inches (2018)
3. 59.05 inches (1972)
4. 58.09 inches (1996)
5. 55.43 inches (1979)
Weather records have been kept at what is now Washington Dulles
International Airport (IAD) since 1960.

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No talk of the possibility of some wintry weather Friday night for our western folk?  From this morning's AFD:

High pressure slides east into the Atlantic Friday, and return
flow starts to bring milder air back north. A system will
already be approaching quickly, however, and it will be a race
between the returning warmer air and the precip. There is a
significant chance of some wintry weather at the onset Friday
night into Saturday as the storm moves in. Just how persistent
this wintry weather will be is yet to be determined, but anyone
with travel plans Friday night into Saturday should keep an eye
on evolving forecasts.

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No talk of the possibility of some wintry weather Friday night for our western folk?  From this morning's AFD:


High pressure slides east into the Atlantic Friday, and returnflow starts to bring milder air back north. A system willalready be approaching quickly, however, and it will be a racebetween the returning warmer air and the precip. There is asignificant chance of some wintry weather at the onset Fridaynight into Saturday as the storm moves in. Just how persistentthis wintry weather will be is yet to be determined, but anyonewith travel plans Friday night into Saturday should keep an eyeon evolving forecasts.





GFS and GEFS have been increasingly interested in starting the precip out west as sleet.
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57 minutes ago, WeatherLovingDoc said:

Pardon me all. I've reviewed many posts since yesterday. Are we here in Washington DC area suppose to get way below normal temps for Thanksgiving and Friday for sure? I have family coming in. Tyvm. 

Replying to you in this instead of the LR thread. Yes, it will be abnormally cold in DMV on Thursday. 

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16 hours ago, losetoa6 said:

What's the low max records for the airports I wonder ...

LWX AFD calls low max at 31, but I think they're talking about Thanksgiving day. I see the record for Nov 22 as 29; in 1880.

from Sterling:

Baltimore MD area
Year High Elapsed
2017  44   1 year
2013  38   5 years
2000  37  18 years
1996  33  22 years
1930  31  88 years
The high has not been lower than 31 on Thanksgiving since
official temperature record keeping began in 1872.

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1 hour ago, GramaxRefugee said:

LWX AFD calls low max at 31, but I think they're talking about Thanksgiving day. I see the record for Nov 22 as 29; in 1880.

from Sterling:

Baltimore MD area
Year High Elapsed
2017  44   1 year
2013  38   5 years
2000  37  18 years
1996  33  22 years
1930  31  88 years
The high has not been lower than 31 on Thanksgiving since
official temperature record keeping began in 1872.

Records 

 

 

 

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