Freeze Warning 1, NWS Baltimore/Washington

Baltimore County, MD, Carroll County, MD, Frederick County, MD, Harford County, MD, Washington County, MD, Albemarle County, VA, Amherst County, VA, Augusta County, VA, City of Charlottesville, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Page County, VA, Rappahannock County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Jefferson County, WV, Morgan County, WV

463 
WWUS71 KLWX 211733
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
133 PM EDT Wed Apr 21 2021

MDZ003>006-507-VAZ025>031-040-501-505-507-508-WVZ051>053-220145-
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Washington-Frederick MD-Carroll-Northern Baltimore-
Northwest Harford-Augusta-Rockingham-Shenandoah-Frederick VA-Page-
Warren-Clarke-Rappahannock-Northern Fauquier-Western Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-Morgan-
Berkeley-Jefferson-
Including the cities of Hagerstown, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Reisterstown, Cockeysville, 
Jarrettsville, Staunton, Waynesboro, Stuarts Draft, Harrisonburg,
Strasburg, Woodstock, Mount Jackson, New Market, Winchester, 
Luray, Shenandoah, Stanley, Front Royal, Berryville, Washington, 
Warrenton, Purcellville, Big Meadows, Wintergreen, Paw Paw, 
Martinsburg, Charles Town, and Shepherdstown
133 PM EDT Wed Apr 21 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT THURSDAY...

* WHAT...Sub-freezing temperatures ranging from 25 to 30 along the
  ridges above 1500 feet to around 30 to 32 degrees in the
  valleys. 

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

* WHEN...From midnight tonight to 9 AM EDT Thursday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

CJL

471 
WWUS71 KLWX 211847
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
247 PM EDT Wed Apr 21 2021

VAZ505-220500-
/O.NEW.KLWX.WI.Y.0007.210421T1900Z-210422T0000Z/
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Western Loudoun-
Including the city of Purcellville
247 PM EDT Wed Apr 21 2021

...WIND ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT THURSDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 32 expected. For the Wind Advisory, northwest winds 15 
  to 25 mph with gusts up to 50 mph expected.

* WHERE...Western Loudoun County.

* WHEN...For the Freeze Warning, from midnight tonight to 9 AM 
  EDT Thursday. For the Wind Advisory, until 8 PM EDT this 
  evening.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result. Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

MDZ003>006-507-VAZ025>031-040-501-507-508-WVZ051>053-220500-
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Washington-Frederick MD-Carroll-Northern Baltimore-
Northwest Harford-Augusta-Rockingham-Shenandoah-Frederick VA-Page-
Warren-Clarke-Rappahannock-Northern Fauquier-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-Morgan-
Berkeley-Jefferson-
Including the cities of Hagerstown, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Reisterstown, Cockeysville, 
Jarrettsville, Staunton, Waynesboro, Stuarts Draft, Harrisonburg,
Strasburg, Woodstock, Mount Jackson, New Market, Winchester, 
Luray, Shenandoah, Stanley, Front Royal, Berryville, Washington, 
Warrenton, Big Meadows, Wintergreen, Paw Paw, Martinsburg, 
Charles Town, and Shepherdstown
247 PM EDT Wed Apr 21 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 30 expected.

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

* WHEN...From midnight tonight to 9 AM EDT Thursday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

DCZ001-MDZ013-014-016>018-503-504-VAZ052>055-057-506-220000-
/O.NEW.KLWX.WI.Y.0007.210421T1900Z-210422T0000Z/
District of Columbia-Prince Georges-Anne Arundel-Charles-
St. Marys-Calvert-Northwest Montgomery-
Central and Southeast Montgomery-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-King George-
Eastern Loudoun-
Including the cities of Washington, Bowie, Suitland-Silver Hill, 
Clinton, College Park, Greenbelt, Laurel, Camp Springs, 
Glen Burnie, Annapolis, Severn, South Gate, Severna Park, Arnold,
Odenton, St. Charles, Waldorf, Lexington Park, California, 
Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby, 
Prince Frederick, Germantown, Damascus, Bethesda, Rockville, 
Gaithersburg, Silver Spring, Dale City, Manassas, Woodbridge, 
Lake Ridge, Montclair, Reston, Herndon, Annandale, Centreville, 
Chantilly, McLean, Franconia, Arlington, Alexandria, 
Falls Church, Falmouth, Dahlgren, Leesburg, Ashburn, and Sterling
247 PM EDT Wed Apr 21 2021

...WIND ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Northwest winds 15 to 20 mph with gusts up to 50 mph 
  expected.

* WHERE...Portions of The District of Columbia, central and 
  southern Maryland and northern Virginia. 

* WHEN...Until 8 PM EDT this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

908 
WWUS71 KLWX 220001
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
801 PM EDT Wed Apr 21 2021

VAZ505-220815-
/O.EXP.KLWX.WI.Y.0007.000000T0000Z-210422T0000Z/
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Western Loudoun-
Including the city of Purcellville
801 PM EDT Wed Apr 21 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT THURSDAY...
...WIND ADVISORY HAS EXPIRED...

* WHAT...Sub-freezing temperatures as low as 32 expected.

* WHERE...Western Loudoun County.

* WHEN...From midnight tonight to 9 AM EDT Thursday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

DCZ001-MDZ013-014-016>018-503-504-VAZ052>055-057-506-220115-
/O.EXP.KLWX.WI.Y.0007.000000T0000Z-210422T0000Z/
District of Columbia-Prince Georges-Anne Arundel-Charles-
St. Marys-Calvert-Northwest Montgomery-
Central and Southeast Montgomery-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-King George-
Eastern Loudoun-
Including the cities of Washington, Bowie, Suitland-Silver Hill, 
Clinton, College Park, Greenbelt, Laurel, Camp Springs, 
Glen Burnie, Annapolis, Severn, South Gate, Severna Park, Arnold,
Odenton, St. Charles, Waldorf, Lexington Park, California, 
Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby, 
Prince Frederick, Germantown, Damascus, Bethesda, Rockville, 
Gaithersburg, Silver Spring, Dale City, Manassas, Woodbridge, 
Lake Ridge, Montclair, Reston, Herndon, Annandale, Centreville, 
Chantilly, McLean, Franconia, Arlington, Alexandria, 
Falls Church, Falmouth, Dahlgren, Leesburg, Ashburn, and Sterling
801 PM EDT Wed Apr 21 2021

...WIND ADVISORY HAS EXPIRED...

Winds have dropped below advisory criteria.

$$

MDZ003>006-507-VAZ025>031-040-501-507-508-WVZ051>053-220815-
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Washington-Frederick MD-Carroll-Northern Baltimore-
Northwest Harford-Augusta-Rockingham-Shenandoah-Frederick VA-Page-
Warren-Clarke-Rappahannock-Northern Fauquier-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-Morgan-
Berkeley-Jefferson-
Including the cities of Hagerstown, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Reisterstown, Cockeysville, 
Jarrettsville, Staunton, Waynesboro, Stuarts Draft, Harrisonburg,
Strasburg, Woodstock, Mount Jackson, New Market, Winchester, 
Luray, Shenandoah, Stanley, Front Royal, Berryville, Washington, 
Warrenton, Big Meadows, Wintergreen, Paw Paw, Martinsburg, 
Charles Town, and Shepherdstown
801 PM EDT Wed Apr 21 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 30 expected.

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

* WHEN...From midnight tonight to 9 AM EDT Thursday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

581 
WWUS71 KLWX 220106
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
906 PM EDT Wed Apr 21 2021

VAZ036>039-051-220915-
/O.NEW.KLWX.FZ.A.0002.210423T0600Z-210423T1300Z/
/O.EXA.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Nelson-Albemarle-Greene-Madison-Culpeper-
Including the cities of Lovingston, Charlottesville, 
Stanardsville, Madison, and Culpeper
906 PM EDT Wed Apr 21 2021

...FREEZE WARNING IN EFFECT UNTIL 9 AM EDT THURSDAY...
...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 32 expected. For the Freeze Watch, sub-freezing 
  temperatures as low as 32 possible.

* WHERE...Nelson, Albemarle, Greene, Madison and Culpeper 
  Counties.

* WHEN...For the Freeze Warning, until 9 AM EDT Thursday. For 
  the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

MDZ003>005-VAZ025>031-040-501-505-507-508-WVZ051>053-220915-
/O.NEW.KLWX.FZ.A.0002.210423T0600Z-210423T1300Z/
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Washington-Frederick MD-Carroll-Augusta-Rockingham-Shenandoah-
Frederick VA-Page-Warren-Clarke-Rappahannock-Northern Fauquier-
Western Loudoun-Northern Virginia Blue Ridge-
Central Virginia Blue Ridge-Morgan-Berkeley-Jefferson-
Including the cities of Hagerstown, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Staunton, Waynesboro, Stuarts Draft, 
Harrisonburg, Strasburg, Woodstock, Mount Jackson, New Market, 
Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville, 
Washington, Warrenton, Purcellville, Big Meadows, Wintergreen, 
Paw Paw, Martinsburg, Charles Town, and Shepherdstown
906 PM EDT Wed Apr 21 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THURSDAY...
...FREEZE WATCH IN EFFECT FROM LATE THURSDAY NIGHT THROUGH FRIDAY
MORNING...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 30 expected. For the Freeze Watch, sub-freezing 
  temperatures as low as 31 possible.

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

* WHEN...For the Freeze Warning, until 9 AM EDT Thursday. For 
  the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

MDZ006-507-220915-
/O.CON.KLWX.FZ.W.0001.210422T0400Z-210422T1300Z/
Northern Baltimore-Northwest Harford-
Including the cities of Reisterstown, Cockeysville, 
and Jarrettsville
906 PM EDT Wed Apr 21 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 32 expected.

* WHERE...Northern Baltimore and Northwest Harford Counties.

* WHEN...Until 9 AM EDT Thursday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

520 
WWUS71 KLWX 220833
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
433 AM EDT Thu Apr 22 2021

MDZ003>005-VAZ025>031-036>040-051-501-505-507-508-WVZ051>053-
221645-
/O.CON.KLWX.FZ.W.0001.000000T0000Z-210422T1300Z/
/O.CON.KLWX.FZ.A.0002.210423T0600Z-210423T1300Z/
Washington-Frederick MD-Carroll-Augusta-Rockingham-Shenandoah-
Frederick VA-Page-Warren-Clarke-Nelson-Albemarle-Greene-Madison-
Rappahannock-Culpeper-Northern Fauquier-Western Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-Morgan-
Berkeley-Jefferson-
Including the cities of Hagerstown, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Staunton, Waynesboro, Stuarts Draft, 
Harrisonburg, Strasburg, Woodstock, Mount Jackson, New Market, 
Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville, 
Lovingston, Charlottesville, Stanardsville, Madison, Washington, 
Culpeper, Warrenton, Purcellville, Big Meadows, Wintergreen, 
Paw Paw, Martinsburg, Charles Town, and Shepherdstown
433 AM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY MORNING...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 30 expected. For the Freeze Watch, sub-freezing 
  temperatures as low as 31 possible.

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

* WHEN...For the Freeze Warning, until 9 AM EDT Thursday. For 
  the Freeze Watch, from late Thursday night through Friday 
  morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

MDZ006-507-221300-
/O.CON.KLWX.FZ.W.0001.000000T0000Z-210422T1300Z/
Northern Baltimore-Northwest Harford-
Including the cities of Reisterstown, Cockeysville, 
and Jarrettsville
433 AM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 32 expected.

* WHERE...Northern Baltimore and Northwest Harford Counties.

* WHEN...Until 9 AM EDT Thursday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

822 
WWUS71 KLWX 221238
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
838 AM EDT Thu Apr 22 2021

MDZ003>005-VAZ025>031-036>040-051-501-505-507-508-WVZ051>053-
222045-
/O.EXP.KLWX.FZ.W.0001.000000T0000Z-210422T1300Z/
/O.CON.KLWX.FZ.A.0002.210423T0600Z-210423T1300Z/
Washington-Frederick MD-Carroll-Augusta-Rockingham-Shenandoah-
Frederick VA-Page-Warren-Clarke-Nelson-Albemarle-Greene-Madison-
Rappahannock-Culpeper-Northern Fauquier-Western Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-Morgan-
Berkeley-Jefferson-
Including the cities of Hagerstown, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Staunton, Waynesboro, Stuarts Draft, 
Harrisonburg, Strasburg, Woodstock, Mount Jackson, New Market, 
Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville, 
Lovingston, Charlottesville, Stanardsville, Madison, Washington, 
Culpeper, Warrenton, Purcellville, Big Meadows, Wintergreen, 
Paw Paw, Martinsburg, Charles Town, and Shepherdstown
838 AM EDT Thu Apr 22 2021

...FREEZE WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY MORNING...
...FREEZE WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 32 possible.

* WHERE...Portions of northern Maryland, northern Virginia near 
  and along the Blue Ridge Mountains, the eastern Panhandle of 
  West Virginia, the Shenandoah Valley of Virginia, and the 
  Virginia Piedmont.

* WHEN...From late tonight through Friday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

MDZ006-507-221345-
/O.EXP.KLWX.FZ.W.0001.000000T0000Z-210422T1300Z/
Northern Baltimore-Northwest Harford-
Including the cities of Reisterstown, Cockeysville, 
and Jarrettsville
838 AM EDT Thu Apr 22 2021

...FREEZE WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING...

Temperatures are rising.

$$

DHOF

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
353 AM EDT Wed Apr 21 2021

.SYNOPSIS...
A strong cold front will cross the area today. Canadian high
pressure will build to our west tonight through Thursday before
settling to the south late in the week. Low pressure may will
likely pass through the area this weekend before high pressure
returns early next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
A potent upper-level trough will dig overhead through tonight.
The surface low associated with this will strengthen and track
to our north while a cold front passes through our area
today before moving offshore Wednesday night. A few showers are
possible this morning into early this afternoon along and ahead
of the cold front, with highest confidence for precipitation
being near and east of Interstate 95 and also along/west of the
Allegheny Front (upslope component to low-level flow). The
forcing along the front will be strong, so a line of gusty
showers and perhaps a severe thunderstorm is most likely to
setup to our east where instability will be higher due to the
later time of the frontal passage. However, there still is an
isolated threat for a severe storm in our area anywhere from
near I-95 to the Bay.

A mild southerly flow ahead of the cold front will give way to
sharply colder conditions (temps will fall from the 50s and 60s
to the 40s and 50s quickly with the frontal passage) and gusty
northwest winds of 25 to 40 mph. The cold front will move east
of the Allegheny Highlands by 8 AM, then through the I-81
corridor to the Blue Ridge Mountains between 8 AM and 11 AM,
then through the metro areas between 11 AM and 1 PM, and
clearing extreme southern MD and the nearby water zones between
2 PM and 4 PM.

The upper-level trough will remain overhead tonight allowing
for blustery and cold conditions for this time of year. A Freeze
Warning is in effect for northern MD and locations near/west of
the Blue Ridge Mountains where the growing season is in effect.
It will be close in the valleys with temperatures around 32
degrees. There is a possibility that wind and some clouds may
keep temperatures up, but the air aloft will be quite cold and
there may even be a little break in the winds toward sunrise.
Therefore, a Freeze Warning has been issued. Temperatures in the
ridges will be well below freezing.

For locations along and west of the Allegheny Front, the strong
cold advection and upslope flow will result rain showers
changing to snow showers later this morning into this afternoon.
Scattered snow showers will continue tonight. There will be some
instability, and that is causing elevated numbers in the snow
squall parameter. Heavier bursts of snow are likely especially
this afternoon and evening. The warmer ground and antecedent
conditions will limit snowfall accumulations, but 1-2" are
possible for the higher ridge tops above 3kft through tonight. A
few rain or snow showers may even spill east of the mountains
due to the high inversion and instability. However, any
precipitation will be light.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
The upper-level trough will remain overhead Thursday while low
pressure slowly tracks into the Canadian Maritimes. Gusty
northwest winds are expected and it will be quite chilly for
this time of year. A few snow showers are expected along/west of
the Allegheny Front and a rain/snow shower could spill east of
the mountains as well. Winds will diminish Thursday night as the
upper-level trough departs and high pressure builds nearby to
the south and west. More chilly conditions are expected and
frost/freeze headlines may be warranted.

High pressure will build to the south for Friday and Friday
night, and a return flow will allow for more seasonable
conditions along with some sunshine for Friday.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
Conditions will start out dry on Saturday, but rain is expected to
overspread the area from southwest to northeast during the
afternoon and evening hours as an area of low pressure
approaches from the southwest. There are some subtle differences
in the track of the low amongst model guidance, but little
sensible differences in terms of impact, with nearly all
deterministic and ensemble solutions showing a soaking rain
across the area Saturday afternoon through Saturday night. With
the low tracking nearby and a large shield of stratiform shield
of precipitation preceding it, we should be stable. As a result,
severe thunderstorms shouldn't be a concern. Flooding isn't
expected to be a concern either, with dry antecedent conditions,
and precipitation totals generally under an inch.

The aforementioned area of low pressure and its associated
shortwave trough will progress off to our east on Sunday. This
should lead to clearing skies throughout the day. The main
weather feature of note on Sunday will be winds. Gusts of 30-40
mph appear possible at times in northwesterly flow behind the
departing area of low pressure. Temperatures on Sunday are
expected to max out in the 60s for most.

The mid-upper level flow pattern across the CONUS is expected to
amplify early next week as a trough digs into the western US.
Heights will rise downstream of this trough, with a ridge
building over the Great Lakes for Monday and Tuesday. This will
place us in northwesterly flow aloft, which will encourage the
maintenance of high pressure at the surface and quiet weather
conditions. Sunny skies are in the forecast for both Monday and
Tuesday, with a moderating trend in temperatures anticipated.
Highs will reach well into the 70s by Tuesday.

&&

.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/...
VFR conditions are expected through Friday night. An isolated
shower or perhaps even a thunderstorm is possible across the
eastern terminals through midday. However, confidence for a
stronger storm has lowered with the more favorable setup being
to the east. Will continue to monitor, especially for KBWI,
KMTN, and KDCA because it will be close.

A wind shift to the west and northwest with gusts around 25 to
35 knots is expected behind the frontal passage later this
morning through early this afternoon. The gusty winds will
continue this evening before diminishing some overnight and then
picking back up for Thursday.

Winds will diminish Thursday night as high pressure settles to
our south. A lighter  return flow is expected Friday into
Friday night.

VFR conditions are expected for the first half of Saturday.
Conditions may drop to sub-VFR Saturday afternoon through
Saturday night as rain and low clouds move in. A return to VFR
conditions is expected on Sunday, along with gusty
northwesterly winds.

&&

.MARINE...
A cold front will pass through the waters late this morning
through mid-afternoon. A line of showers and perhaps a gusty
thunderstorm is possible ahead of the cold front. Special Marine
Warnings may be warranted.

Winds will shift to the west and northwest behind the front with
gusts up to 35 knots expected. A Gale Warning is in effect for
the waters today through tonight, but the strongest winds are
most likely later this afternoon through this evening.

More gusty winds are expected for Thursday, but confidence is
too low for a Gale Warning at this time due to a slightly weaker
wind field aloft. However, gusts around 30 knots are expected
and an SCA is in effect. Winds will diminish some for Thursday
night and Friday, but an SCA may still be needed for portions of
the waters. High pressure will settle nearby to the south Friday
night.

SCA level winds appear possible on Saturday in southerly flow. At
least SCA level winds appear likely on Sunday in northwesterly flow.
Gale conditions may be possible, but surface temperatures warmer
than water temperatures could be a limiting factor.

&&

.FIRE WEATHER...
A strong cold front will pass through the Shenandoah Valley
late this morning and through the metro areas and VA Piedmont by
early this afternoon. Gusty west to northwest winds and falling
relative humidity is expected behind the cold front. Rainfall,
if any should average out to be light for most areas and fuel
moisture remains low. This may enhance the threat for the spread
of wildfires this afternoon. However, that threat may be limited
somewhat by the recent greenup that has occurred.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...Freeze Warning from midnight tonight to 9 AM EDT Thursday for
     MDZ003>006-507.
VA...Freeze Warning from midnight tonight to 9 AM EDT Thursday for
     VAZ025>031-040-501-505-507-508.
WV...Freeze Warning from midnight tonight to 9 AM EDT Thursday for
     WVZ051>053.
MARINE...Small Craft Advisory until 6 AM EDT early this morning for
     ANZ530>543.
     Small Craft Advisory from 6 AM to 6 PM EDT Thursday for
     ANZ530>543.
     Gale Warning until 6 AM EDT Thursday for ANZ530>543.

&&

SYNOPSIS...BJL
NEAR TERM...BJL
SHORT TERM...BJL
LONG TERM...KJP
AVIATION...BJL/KJP
MARINE...BJL/KJP
FIRE WEATHER...BJL

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
1040 PM EDT Tue Apr 20 2021

ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508-
VAZ052>057-211000-
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-Cecil-Southern Baltimore-
Prince Georges-Anne Arundel-Charles-St. Marys-Calvert-
Central and Southeast Montgomery-Central and Southeast Howard-
Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
1040 PM EDT Tue Apr 20 2021

This Hazardous Weather Outlook is for the Maryland portion of the
Chesapeake Bay, Tidal Potomac River, and I-95 corridor through
central Maryland, northern Virginia, and District of Columbia.

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

There is an isolated threat for severe thunderstorms late
Wednesday morning through mid-afternoon with damaging winds being
the primary threat.

A Gale Warning is in effect for all waters from 6 AM Wednesday
until 2 AM Thursday. A Gale Watch is in effect after that through
Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Wednesday.

MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
WVZ050>053-055-211000-
Washington-Frederick MD-Carroll-Northern Baltimore-
Northwest Montgomery-Northwest Howard-Northwest Harford-Augusta-
Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-Nelson-
Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper-
Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-Northern Virginia Blue Ridge-
Central Virginia Blue Ridge-Hampshire-Morgan-Berkeley-Jefferson-
Hardy-
1040 PM EDT Tue Apr 20 2021

This Hazardous Weather Outlook is for portions of eastern West
Virginia, northern and central Virginia, and central and western
Maryland.

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

There is an isolated threat for severe thunderstorms Wednesday
morning through early afternoon with damaging winds being the
primary threat. The best chance for a strong to severe storm will
be east of the Blue Ridge and Catoctin Mountains.

A Freeze Watch is in effect for portions of the Shenandoah Valley
and Blue Ridge Mountains Wednesday night into Thursday morning.

Frost or freeze conditions are possible Thursday night into
Friday morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Wednesday.

MDZ001-501-502-VAZ503-504-WVZ501>506-211000-
Garrett-Extreme Western Allegany-Central and Eastern Allegany-
Western Highland-Eastern Highland-Western Grant-Eastern Grant-
Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
1040 PM EDT Tue Apr 20 2021

This Hazardous Weather Outlook is for the Allegheny Front
counties in western Maryland, eastern West Virginia, and Highland
County Virginia.

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.