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Jan 19th Storm OBS Thread


DCAlexandria
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10 minutes ago, Bob Chill said:

March 2015 had 2 events in one week pop up out of nowhere lol. Small but still. It was a wild month front to back 

You might be referring to 2014.  We had 3 snowfalls spread out through the month.  We did get one in early March '15, too.  I took a rack of pics/vids from both of those winters...I've got a legit media diary of events from 2013 to 2019 lol.

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Just now, stormtracker said:

They are terrible

I feel they got lucky in 2010... but over the last few years I would rather just come here and lurk.

(I feel bad , we have a family connection to one of them too... but seriously, had to give it up mainly because of the comments)

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13 minutes ago, TSSN+ said:

Have they issued the rain and pass out advisory yet?  

You missed this earlier, apparently ...

URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
826 AM EST Thu Jan 18 2024

DCZ001-MDZ013-014-016-018-503-
/O.NEW.KLWX.WW.Y.0009.240119T0900Z-240120T0000Z/
Georgetown, including M street
826 AM EST Thu Jan 18 2024

…COLD RAIN ADVISORY UNTIL 11 AM EST
FRIDAY...
…COLD RAIN ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 11 AM EST
FRIDAY...

* WHAT… Cold rain expected for the duration of the event. Total rain accumulations of two-tenths of an inch. 

* WHERE… Georgetown.

* WHEN...until 11 AM EST Friday.
  
* IMPACTS...Travel will be very wet in the affected area. Frustration levels might also peak when observing frozen precipitation in adjacent areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution while viewing forecasted winter weather and storm observations.

Slow down, walk outside and look up to verify the precipitation is in fact rain and not frozen.

&&

$$

 

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3 hours ago, MillvilleWx said:

This. Before (Few days back) it was looking like that was favored for areas well to our north so I was content with the scraps. Now the trend is very much for this to happen overhead and the soundings/spatial outputs for 7H VV’s and correlated QG-convergence panels indicates that’s the expectation. We will see rates in some bands surpass what just occurred from the past event. It’s a vigorous jet streak we are working with. If you know anything about synoptic scale meteorology and translating to the mesoscale, this is prime for some surprises, so long as we aren’t being lead astray by guidance. 

i was just reading this to my husband. now to look to see if i can see the figures, because i want to know what I should be looking for.

https://www.weather.gov/epz/research_papers_vptb_csi

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3 minutes ago, 87storms said:

You might be referring to 2014.  We had 3 snowfalls spread out through the month.  We did get one in early March '15, too.  I took a rack of pics/vids from both of those winters...I've got a legit media diary of events from 2013 to 2019 lol.

I think both you and @Bob Chill are correct.  In March 2014 we had 3 notable events...one early in the month (5.3" where I am), one on St. Patrick's Day (8"), and one on March 25 (3").  We even got a quick inch of snow on (I believe) the 30th after cold rain most of that day.  That was a crazy, snowy March in a remarkable wall-to-wall winter.

In 2015, I recall some light snow and decent icing around March 1-2, and more ice around the 3rd.  Then we got a nice 6.5" snow on March 5.  February that year featured extremely cold temperatures and a couple of solid events.

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1 minute ago, Scarlet Pimpernel said:

I think both you and @Bob Chill are correct.  In March 2014 we had 3 notable events...one early in the month (5.3" where I am), one on St. Patrick's Day (8"), and one on March 25 (3").  We even got a quick inch of snow on (I believe) the 30th after cold rain most of that day.  That was a crazy, snowy March in a remarkable wall-to-wall winter.

In 2015, I recall some light snow and decent icing around March 1-2, and more ice around the 3rd.  Then we got a nice 6.5" snow on March 5.  February that year featured extremely cold temperatures and a couple of solid events.

Yep, that matches my records lol.  I was living in downtown Bethesda at the time.

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Just now, 87storms said:

Yep, that matches my records lol.  I was living in downtown Bethesda at the time.

Yup, that's where I'm at now (and was at the time)!  What was so striking about that first week of March 2015 is the fact that we actually got ice in the middle of the day, in March, and then that neat snow event a few days later.  Likewise, 2014 was just incredible with the amount of snow we got in March!

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Late Jan - March 2015 was for me the most wintry stretch of weather I have experienced in this area. There have been stretches with more total snowfall, and more frequent snowfall, but in that stretch we had fairly frequent snow, 1 or 2 fairly large snowfalls, and it was extremely cold. There was more or less snow covering the ground for 1-2 months.

 

I'm thrilled to see that this storm looks like it might over-perform, but I am skeptical with these norlun type events. The last two that were forecast for this region, I think one was in 2018-2019, gave me a little dusting and in-laws in the NJ suburbs of Philadelphia got 6 inches. I think this may have even happened twice that year. But I wouldn't be surprised if either Baltimore DC or both bust big on this one ... I hope I am wrong though.  

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Latest from LWX: 

PRECIP ALOFT HAS BEEN NOTED ON REGIONAL 88DS AND GPM MICROWAVE  
IMAGER OVER THE PAST 6 HOURS ACROSS NORTH CENTRAL AND NORTHEAST  
MARYLAND, BUT NO SFC OBS HAVE SHOWN ANYTHING REACHING THE   
GROUND AS LOW-LEVEL DEWPOINT DEPRESSIONS REMAIN AT OR ABOVE 20C  
PER 19/00Z IAD SOUNDING. NEW SET OF 18Z GUIDANCE DOES NOT SHOW   
ANY APPRECIABLE CHANGES TO SPEAK OF ABOUT FRIDAY'S FORECAST.  
  
STRONG SHORTWAVE-TROUGH AND ASSOCIATED VORT MAX WILL PASS  
THROUGH THE AREA AROUND MIDDAY FRI SUPPORTING STRONG LIFT TO  
GENERATE SNOW. HOWEVER, THE SYSTEM WILL LACK DEEP MOISTURE TO  
MAKE THIS A MAJOR STORM IN ADDITION TO BEING FAIRLY PROGRESSIVE.  
BLENDED TPW PRODUCT SHOWS PWAT VALUES GENERALLY LESS THAN 0.4  
INCHES WITH NO SIGNIFICANT AREAS OF HIGHER MOISTURE LIKELY TO   
ADVECT IN. FOR BIGGER STORMS, TYPICALLY 0.5 INCH PWAT VALUES AND  
HIGHER ARE NEEDED UNLESS IS A SUPER COLD AIR MASS. ALL OF THESE  
FACTORS, IN ADDITION, LACK OF A CLOSED 850-700 MB CIRCULATION,   
SUGGEST WARNING LEVEL SNOW ACCUMULATIONS SEEM UNLIKELY. OVERALL,  
THE FORECAST AND SNOW AMOUNTS SEEM ON TRACK AND WILL REMAIN   
UNCHANGED TONIGHT. FCST SNOW AMOUNTS ACROSS THE FAR SOUTHERN   
AREAS LIKE FREDERICKSBURG VA MAY BE SOMEWHAT OVERDONE DUE TO   
LACK OF MID-LEVEL SATURATION WHICH MAY INHIBIT SNOWFALL RATES.   
IT STILL LOOKS LIKE THE HEAVIEST ACCUMULATIONS OUTSIDE OF THE   
MOUNTAIN AREAS WILL OCCUR ALONG AND NORTH OF THE I-70 CORRIDOR   
WITH UP TO A FOOT POSSIBLE ACROSS THE APPALACHIAN REGION.   
HEAVIEST ACCUMULATION IS EXPECTED IN THE 13Z-19Z FRI TIME FRAME. 
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17 minutes ago, 87storms said:

You might be referring to 2014.  We had 3 snowfalls spread out through the month.  We did get one in early March '15, too.  I took a rack of pics/vids from both of those winters...I've got a legit media diary of events from 2013 to 2019 lol.

yeah..I think Bob is remembering this period in 2014.  I'm gonna add it to my list

2/25: 2.25", 2/26: 1.25", 3/3: 4.0",

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12 minutes ago, psuhoffman said:

My sister went to college there 

I met my wife of 11 years there. In fact we got married at the James Rumsey Monument (a small park on a bluff overlooking the Potomac). A lot of my family also went to Shepherd and my step father was a professor there for years (now retired). It really is an amazing small town.

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4 minutes ago, StormyClearweather said:
Latest from LWX: 

PRECIP ALOFT HAS BEEN NOTED ON REGIONAL 88DS AND GPM MICROWAVE  
IMAGER OVER THE PAST 6 HOURS ACROSS NORTH CENTRAL AND NORTHEAST  
MARYLAND, BUT NO SFC OBS HAVE SHOWN ANYTHING REACHING THE   
GROUND AS LOW-LEVEL DEWPOINT DEPRESSIONS REMAIN AT OR ABOVE 20C  
PER 19/00Z IAD SOUNDING. NEW SET OF 18Z GUIDANCE DOES NOT SHOW   
ANY APPRECIABLE CHANGES TO SPEAK OF ABOUT FRIDAY'S FORECAST.  
  
STRONG SHORTWAVE-TROUGH AND ASSOCIATED VORT MAX WILL PASS  
THROUGH THE AREA AROUND MIDDAY FRI SUPPORTING STRONG LIFT TO  
GENERATE SNOW. HOWEVER, THE SYSTEM WILL LACK DEEP MOISTURE TO  
MAKE THIS A MAJOR STORM IN ADDITION TO BEING FAIRLY PROGRESSIVE.  
BLENDED TPW PRODUCT SHOWS PWAT VALUES GENERALLY LESS THAN 0.4  
INCHES WITH NO SIGNIFICANT AREAS OF HIGHER MOISTURE LIKELY TO   
ADVECT IN. FOR BIGGER STORMS, TYPICALLY 0.5 INCH PWAT VALUES AND  
HIGHER ARE NEEDED UNLESS IS A SUPER COLD AIR MASS. ALL OF THESE  
FACTORS, IN ADDITION, LACK OF A CLOSED 850-700 MB CIRCULATION,   
SUGGEST WARNING LEVEL SNOW ACCUMULATIONS SEEM UNLIKELY. OVERALL,  
THE FORECAST AND SNOW AMOUNTS SEEM ON TRACK AND WILL REMAIN   
UNCHANGED TONIGHT. FCST SNOW AMOUNTS ACROSS THE FAR SOUTHERN   
AREAS LIKE FREDERICKSBURG VA MAY BE SOMEWHAT OVERDONE DUE TO   
LACK OF MID-LEVEL SATURATION WHICH MAY INHIBIT SNOWFALL RATES.   
IT STILL LOOKS LIKE THE HEAVIEST ACCUMULATIONS OUTSIDE OF THE   
MOUNTAIN AREAS WILL OCCUR ALONG AND NORTH OF THE I-70 CORRIDOR   
WITH UP TO A FOOT POSSIBLE ACROSS THE APPALACHIAN REGION.   
HEAVIEST ACCUMULATION IS EXPECTED IN THE 13Z-19Z FRI TIME FRAME. 

Seems they’re laying down advance reasoning why they don’t intend to upgrade to a warning. 

At least it’s not a step back from a general 2-4” dc north and 1-3” south

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6 minutes ago, StormyClearweather said:
Latest from LWX: 

PRECIP ALOFT HAS BEEN NOTED ON REGIONAL 88DS AND GPM MICROWAVE  
IMAGER OVER THE PAST 6 HOURS ACROSS NORTH CENTRAL AND NORTHEAST  
MARYLAND, BUT NO SFC OBS HAVE SHOWN ANYTHING REACHING THE   
GROUND AS LOW-LEVEL DEWPOINT DEPRESSIONS REMAIN AT OR ABOVE 20C  
PER 19/00Z IAD SOUNDING. NEW SET OF 18Z GUIDANCE DOES NOT SHOW   
ANY APPRECIABLE CHANGES TO SPEAK OF ABOUT FRIDAY'S FORECAST.  
  
STRONG SHORTWAVE-TROUGH AND ASSOCIATED VORT MAX WILL PASS  
THROUGH THE AREA AROUND MIDDAY FRI SUPPORTING STRONG LIFT TO  
GENERATE SNOW. HOWEVER, THE SYSTEM WILL LACK DEEP MOISTURE TO  
MAKE THIS A MAJOR STORM IN ADDITION TO BEING FAIRLY PROGRESSIVE.  
BLENDED TPW PRODUCT SHOWS PWAT VALUES GENERALLY LESS THAN 0.4  
INCHES WITH NO SIGNIFICANT AREAS OF HIGHER MOISTURE LIKELY TO   
ADVECT IN. FOR BIGGER STORMS, TYPICALLY 0.5 INCH PWAT VALUES AND  
HIGHER ARE NEEDED UNLESS IS A SUPER COLD AIR MASS. ALL OF THESE  
FACTORS, IN ADDITION, LACK OF A CLOSED 850-700 MB CIRCULATION,   
SUGGEST WARNING LEVEL SNOW ACCUMULATIONS SEEM UNLIKELY. OVERALL,  
THE FORECAST AND SNOW AMOUNTS SEEM ON TRACK AND WILL REMAIN   
UNCHANGED TONIGHT. FCST SNOW AMOUNTS ACROSS THE FAR SOUTHERN   
AREAS LIKE FREDERICKSBURG VA MAY BE SOMEWHAT OVERDONE DUE TO   
LACK OF MID-LEVEL SATURATION WHICH MAY INHIBIT SNOWFALL RATES.   
IT STILL LOOKS LIKE THE HEAVIEST ACCUMULATIONS OUTSIDE OF THE   
MOUNTAIN AREAS WILL OCCUR ALONG AND NORTH OF THE I-70 CORRIDOR   
WITH UP TO A FOOT POSSIBLE ACROSS THE APPALACHIAN REGION.   
HEAVIEST ACCUMULATION IS EXPECTED IN THE 13Z-19Z FRI TIME FRAME. 

Boo on the part about mid-level saturation around FXBG, but it all seems reasonable. Maybe we’ll get lucky.

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1 minute ago, Deck Pic said:

yeah..I think Bob is remembering this period in 2014.  I'm gonna add it to my list

2/25: 2.25", 2/26: 1.25", 3/3: 4.0",

It was 2014. Those years get blended in my mind. So similar. 

Check the yellow bands breaking out in KY/OH... I can extrapolate those to our yards.... heh

 

Screenshot_20240118-215709_Chrome.jpg

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