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December Discobs 2019


George BM
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So, with the 'T' this morning I am batting .250 over the last 40 years for snow falling from the sky on this date. Largest was 5.0 in 2003, 4 were T's, rest were between .5 and 4.0 inches and averages out to 0.4 over that time. I'll have to do a bit more digging to see if I have a greater 'batting average' for a date in Dec.

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From LWX:

Special Weather Statement
National Weather Service Baltimore MD/Washington DC
437 AM EST Thu Dec 12 2019

MDZ004-005-503>506-VAZ052-053-055-056-501-502-505-506-121545-
Frederick MD-Carroll-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-
Prince William/Manassas/Manassas Park-Fairfax-Stafford-
Spotsylvania-Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-
Including the cities of Frederick, Ballenger Creek, Eldersburg,
Westminster, Germantown, Damascus, Bethesda, Rockville,
Gaithersburg, Silver Spring, Lisbon, Columbia, Ellicott City,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Falmouth, Fredericksburg, Warrenton, Turnbull, Purcellville,
Leesburg, Ashburn, and Sterling
437 AM EST Thu Dec 12 2019

...POTENTIAL WINTER COMMUTING HAZARD FOR THE BALTIMORE /
WASHINGTON METRO AREAS FRIDAY MORNING...

There is a potential for hazardous commuting conditions for the
Friday morning commute. A period of freezing rain is POSSIBLE (a
30 percent chance in Carroll County increasing to 50 percent in
Fauquier and Spotsylvania Counties) Friday morning across the
northern and western portions of the Baltimore / Washington metro
areas, which would result in an icy accumulation on area roads.

If this threat does materialize during the Friday morning rush-
hour, many roads could quickly turn icy. This could lead to
dangerous traveling conditions, multiple accidents, and extensive
delays.

If commuting Friday morning, be aware of the POSSIBILITY of
significant travel disruptions. Plan ahead by allowing for extra
travel time, and consider using public transportation and telework
options.

Stay tuned for updates on this potential winter weather episode.


 

 

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National Weather Service Baltimore MD/Washington DC 506 AM EST Thu Dec 12 2019 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-131015- Chesapeake Bay north of Pooles Island MD- Chesapeake Bay from Pooles Island to Sandy Point MD- Chesapeake Bay from Sandy Point to North Beach MD- Chesapeake Bay from North Beach to Drum Point MD- Chesapeake Bay from Drum Point MD to Smith Point VA- Tidal Potomac from Key Bridge to Indian Head MD- Tidal Potomac from Indian Head to Cobb Island MD- Tidal Potomac from Cobb Island MD to Smith Point VA- Patapsco River including Baltimore Harbor- Chester River to Queenstown MD-Eastern Bay- Choptank River to Cambridge MD and the Little Choptank River- Patuxent River to Broomes Island MD- Tangier Sound and the inland waters surrounding Bloodsworth Island-District of Columbia-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford- Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- 506 AM EST Thu Dec 12 2019 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and adjacent counties in central Maryland and northern Virginia as well as the District of Columbia. .DAY ONE...Today and Tonight Freezing rain may develop in portions of eastern Virginia very late tonight. Winter Weather Advisories may be required. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Freezing rain is possible in portions of eastern Virginia early Friday. Winter Weather Advisories may be required. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. $$


Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
506 AM EST Thu Dec 12 2019

MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053-
055-501>506-131015-
Washington-Frederick MD-Carroll-Northern Baltimore-
Extreme Western Allegany-Central and Eastern Allegany-
Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-
Nelson-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper-
Northern Fauquier-Southern Fauquier-Western Highland-
Eastern Highland-Western Loudoun-Eastern Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-
Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant-
Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
506 AM EST Thu Dec 12 2019

This Hazardous Weather Outlook is for eastern West Virginia,
northern and central Virginia, and central and western Maryland
with the exception of Garrett County.

.DAY ONE...Today and Tonight

Freezing rain may develop in portions of Virginia very late
tonight. Winter Weather Advisories may be required.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Freezing rain is possible in portions of Virginia, West Virginia
and Maryland on Friday, mainly in the morning. Winter Weather
Advisories may be required.

There is a slight winter storm threat Monday and Monday night for
areas west of Interstate 95. If the threat materializes, it may
cause travel disruptions.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

$$
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For those that use Baltimore Inner Harbor (KDMH ASOS)... obs will continue until at least 2/1/2020...

 

Public Information Statement
National Weather Service Baltimore MD/Washington DC
857 AM EST Thu Dec 12 2019

...SUSPENSION OF OBSERVATIONS DELAYED AT NWS AUTOMATED SURFACE
OBSERVATION SYSTEM AT BALTIMORE INNER HARBOR MD...

The NWS has been notified that the start of construction affecting
the grounds around the NWS Automated Surface Observation System
(ASOS) Baltimore Inner Harbor Maryland (KDMH) has been delayed.

The suspension of observations there is now scheduled to begin on
February 1, 2020 at the earliest. We will provide the exact date for
the temporary removal of our equipment after more a specific
timeline is provided by the construction company.  Observations will
continue until that date.

If you have any questions regarding this matter, please contact:

Chris Strong
Warning Coordination Meteorologist
NWS Baltimore/Washington
[email protected]
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Updated SWS

Special Weather Statement
National Weather Service Baltimore MD/Washington DC
1024 AM EST Thu Dec 12 2019

MDZ004-005-503>506-VAZ052-053-055-056-501-502-505-506-122130-
Frederick MD-Carroll-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-
Prince William/Manassas/Manassas Park-Fairfax-Stafford-
Spotsylvania-Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-
Including the cities of Frederick, Ballenger Creek, Eldersburg,
Westminster, Germantown, Damascus, Bethesda, Rockville,
Gaithersburg, Silver Spring, Lisbon, Columbia, Ellicott City,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Falmouth, Fredericksburg, Warrenton, Turnbull, Purcellville,
Leesburg, Ashburn, and Sterling
1024 AM EST Thu Dec 12 2019

...POTENTIAL WINTER COMMUTING HAZARD FOR THE BALTIMORE /
WASHINGTON METRO AREAS FRIDAY MORNING...

There is a potential for hazardous commuting conditions for the
Friday morning commute. A period of freezing rain is POSSIBLE (a
30 percent chance in Carroll County increasing to 50 percent in
Fauquier and Spotsylvania Counties) Friday morning across the
northern and western portions of the Baltimore / Washington metro
areas, which would result in an icy accumulation on area roads.

If this threat does materialize during the Friday morning rush-
hour, many roads could quickly turn icy. This could lead to
dangerous traveling conditions, multiple accidents, and extensive
delays.

If commuting Friday morning, be aware of the POSSIBILITY of
significant travel disruptions. Plan ahead by allowing for extra
travel time, and consider using public transportation and telework
options.

Stay tuned for updates on this potential winter weather episode.
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URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
151 PM EST Thu Dec 12 2019

WVZ503-504-130300-
/O.NEW.KLWX.WW.Y.0032.191213T1200Z-191213T2300Z/
Western Mineral-Eastern Mineral-
151 PM EST Thu Dec 12 2019

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM TO 6 PM EST
FRIDAY...

* WHAT...Freezing rain expected. Total ice accumulations of up
  to one tenth of an inch.

* WHERE...Mineral County West Virginia.

* WHEN...From 7 AM to 6 PM EST Friday.

* IMPACTS...Difficult travel conditions are possible. The
  hazardous conditions could impact the morning commute.

* ADDITIONAL DETAILS...Freezing rain expected to start during the
  morning hours and continue through much of the afternoon, as
  sub-freezing air struggles to move out of the area. A changeover
  to all rain is expected by the evening though.

------------------------------------------------------------------------

URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
151 PM EST Thu Dec 12 2019

MDZ501-502-130300-
/O.NEW.KLWX.WW.Y.0032.191213T1400Z-191213T2300Z/
Extreme Western Allegany-Central and Eastern Allegany-
151 PM EST Thu Dec 12 2019

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM TO 6 PM EST
FRIDAY...

* WHAT...Freezing rain expected. Total ice accumulations of up
  to one tenth of an inch.

* WHERE...Allegany County Maryland.

* WHEN...From 9 AM to 6 PM EST Friday.

* IMPACTS...Difficult travel conditions are possible. The
  hazardous conditions could impact the morning commute and
  possibly the evening commute.

* ADDITIONAL DETAILS...Freezing rain expected to start during the
  morning hours and continue through much of the afternoon, as
  sub-freezing air struggles to move out of the area. A changeover
  to all rain is expected by the evening though.
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URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
151 PM EST Thu Dec 12 2019

MDZ003-004-VAZ505-WVZ051>053-130300-
/O.NEW.KLWX.WW.Y.0032.191213T1400Z-191213T2000Z/
Washington-Frederick MD-Western Loudoun-Morgan-Berkeley-Jefferson-
151 PM EST Thu Dec 12 2019

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM TO 3 PM EST
FRIDAY...

* WHAT...Freezing rain expected. Total ice accumulations of a
  light glaze.

* WHERE...Portions of north central Maryland, northern Virginia
  and panhandle of West Virginia.

* WHEN...From 9 AM to 3 PM EST Friday.

* IMPACTS...Very slippery sidewalks, roads and bridges are
  possible. The hazardous conditions could impact the morning
  commute.

* ADDITIONAL DETAILS...Freezing rain during the morning will
  gradually change to rain throughout the afternoon.
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