Alert archive / West Virginia / Freeze Warnings in 2021

Freeze Warning 3, NWS Baltimore/Washington

April 30, 2021Grant County, Pendleton County, West Virginia; Highland County, Virginia

NWS Baltimore/Washington issued this freeze warning at Apr 30, 2021, 12:29 PM EDT for Grant County, Pendleton County, West Virginia; Highland County, Virginia. It took effect at May 1, 2021, 12:00 AM EDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 30, 2021, 12:29 PM EDT (16:29 UTC)
In effect from
May 1, 2021, 12:00 AM EDT
Expired
May 1, 2021, 9:00 AM EDT
In force
9 hr
Issued by
NWS Baltimore/Washington

Counties Highland County, VA, Grant County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 166 km from the middle of the area, began a volume at 16:34 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 4.5 hours before the alert went out and 169 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Roanoke, VA at 12:00Z on 2021-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 12:00Z on 2021-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939587897117136156Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
893 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

963 
WWUS71 KLWX 301629
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
1229 PM EDT Fri Apr 30 2021

VAZ503-WVZ501-505-010030-
/O.UPG.KLWX.FZ.A.0003.210501T0400Z-210501T1300Z/
/O.NEW.KLWX.FZ.W.0003.210501T0400Z-210501T1300Z/
/O.CON.KLWX.WI.Y.0008.000000T0000Z-210501T0500Z/
Western Highland-Western Grant-Western Pendleton-
Including the cities of Hightown, Bayard, Mount Storm, 
and Riverton
1229 PM EDT Fri Apr 30 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT
SATURDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 31 expected. For the Wind Advisory, northwest winds 20 to 30
  mph with gusts up to 55 mph.

* WHERE...In Virginia, Western Highland County. In West 
  Virginia, Western Grant and Western Pendleton Counties.

* WHEN...For the Freeze Warning, from midnight tonight to 9 AM 
  EDT Saturday. For the Wind Advisory, until 1 AM EDT Saturday.

* 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.

&&

$$

MDZ001-010030-
/O.UPG.KLWX.FZ.A.0003.210501T0400Z-210501T1300Z/
/O.NEW.KLWX.FZ.W.0003.210501T0400Z-210501T1300Z/
/O.CON.KLWX.WI.Y.0008.000000T0000Z-210501T0500Z/
Garrett-
Including the cities of Mountain Lake Park, Oakland, 
and Grantsville
1229 PM EDT Fri Apr 30 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT
SATURDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 32 expected. For the Wind Advisory, northwest winds 20 to 30 
  mph with gusts up to 55 mph.

* WHERE...Garrett County.

* WHEN...For the Freeze Warning, from midnight tonight to 9 AM 
  EDT Saturday. For the Wind Advisory, until 1 AM EDT Saturday.

* 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.

&&

$$

DCZ001-MDZ003>006-008-011-013-014-503>508-VAZ053-054-505-506-
WVZ051>053-010030-
/O.CON.KLWX.HW.W.0002.000000T0000Z-210501T0600Z/
District of Columbia-Washington-Frederick MD-Carroll-
Northern Baltimore-Cecil-Southern Baltimore-Prince Georges-
Anne Arundel-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Northwest Harford-Southeast Harford-
Fairfax-Arlington/Falls Church/Alexandria-Western Loudoun-
Eastern Loudoun-Morgan-Berkeley-Jefferson-
Including the cities of Washington, Hagerstown, Frederick, 
Ballenger Creek, Eldersburg, Westminster, Reisterstown, 
Cockeysville, Elkton, Baltimore, Bowie, Suitland-Silver Hill, 
Clinton, College Park, Greenbelt, Laurel, Camp Springs, 
Glen Burnie, Annapolis, Severn, South Gate, Severna Park, Arnold,
Odenton, Germantown, Damascus, Bethesda, Rockville, Gaithersburg,
Silver Spring, Lisbon, Columbia, Ellicott City, Jarrettsville, 
Aberdeen, Reston, Herndon, Annandale, Centreville, Chantilly, 
McLean, Franconia, Arlington, Alexandria, Falls Church, 
Purcellville, Leesburg, Ashburn, Sterling, Paw Paw, Martinsburg, 
Charles Town, and Shepherdstown
1229 PM EDT Fri Apr 30 2021

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY...

* WHAT...Northwest winds 25 to 35 mph with gusts up to 60 mph.

* WHERE...The District of Columbia, Central and Southeast 
  Montgomery and Prince Georges Counties in Maryland, and 
  Arlington, Eastern Loudoun, and Fairfax Counties in Virginia 
  including the independent cities of Alexandria, Fairfax, and 
  Falls Church.

* WHEN...Until 2 AM EDT Saturday.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be 
  difficult, especially for high profile vehicles.

* ADDITIONAL DETAILS...The long duration of high wind will 
  likely aid in widespread tree damage and power outages.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. If possible, remain in the lower levels of
your home during the windstorm, and avoid windows. Use caution if
you must drive.

&&

$$

MDZ501-502-VAZ504-WVZ502>504-506-010030-
/O.CON.KLWX.HW.W.0002.000000T0000Z-210501T0500Z/
Extreme Western Allegany-Central and Eastern Allegany-
Eastern Highland-Eastern Grant-Western Mineral-Eastern Mineral-
Eastern Pendleton-
Including the cities of Frostburg, Cumberland, Monterey, 
Petersburg, Elk Garden, Antioch, Keyser, New Creek, Ridgeville, 
Russelldale, Headsville, Fort Ashby, Brandywine, Franklin, 
Oak Flat, Ruddle, and Sugar Grove
1229 PM EDT Fri Apr 30 2021

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY...

* WHAT...Northwest winds 20 to 30 mph with gusts up to 60 mph.

* WHERE...In Maryland, Allegany County. In Virginia, Eastern 
  Highland County. In West Virginia, Eastern Grant, Eastern 
  Pendleton, and Mineral Counties.

* WHEN...Until 1 AM EDT Saturday.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be 
  difficult, especially for high profile vehicles.

* ADDITIONAL DETAILS...The long duration of wind will likely aid 
  in numerous instances of tree damage and power outages.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. If possible, remain in the lower levels of
your home during the windstorm, and avoid windows. Use caution if
you must drive.

&&

$$

VAZ507-508-010030-
/O.CON.KLWX.HW.W.0002.000000T0000Z-210501T0600Z/
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-
Including the cities of Big Meadows and Wintergreen
1229 PM EDT Fri Apr 30 2021

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY...

* WHAT...Northwest winds 25 to 40 mph with gusts up to 65 mph.

* WHERE...Central and Northern Virginia Blue Ridge.

* WHEN...Until 2 AM EDT Saturday.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be 
  difficult, especially for high profile vehicles.

* ADDITIONAL DETAILS...The long duration of high wind will 
  likely aid in widespread tree damage and power outages.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. If possible, remain in the lower levels of
your home during the windstorm, and avoid windows. Use caution if
you must drive.

&&

$$

VAZ025>027-029-030-WVZ055-010030-
/O.CON.KLWX.WI.Y.0008.000000T0000Z-210501T0500Z/
Augusta-Rockingham-Shenandoah-Page-Warren-Hardy-
Including the cities of Staunton, Waynesboro, Stuarts Draft, 
Harrisonburg, Strasburg, Woodstock, Mount Jackson, New Market, 
Luray, Shenandoah, Stanley, Front Royal, and Moorefield
1229 PM EDT Fri Apr 30 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY...

* WHAT...Northwest winds 20 to 30 mph with gusts up to 50 mph.

* WHERE...In Virginia, Augusta, Page, Shenandoah, Rockingham, 
  and Warren Counties, including the independent cities of 
  Harrisonburg, Staunton, and Waynesboro. In West Virginia, 
  Hardy County.

* WHEN...Until 1 AM EDT Saturday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

MDZ016>018-VAZ036>040-051-052-055-057-501-502-010030-
/O.CON.KLWX.WI.Y.0008.000000T0000Z-210501T0600Z/
Charles-St. Marys-Calvert-Nelson-Albemarle-Greene-Madison-
Rappahannock-Culpeper-Prince William/Manassas/Manassas Park-
Stafford-King George-Northern Fauquier-Southern Fauquier-
Including the cities of St. Charles, Waldorf, Lexington Park, 
California, Chesapeake Beach, Huntingtown, Dunkirk, North Beach, 
Lusby, Prince Frederick, Lovingston, Charlottesville, 
Stanardsville, Madison, Washington, Culpeper, Dale City, 
Manassas, Woodbridge, Lake Ridge, Montclair, Falmouth, Dahlgren, 
Warrenton, and Turnbull
1229 PM EDT Fri Apr 30 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY...

* WHAT...Northwest winds 15 to 30 mph with gusts up to 50 mph 
  expected.

* WHERE...Portions of central and northern Virginia and southern 
  Maryland.

* WHEN...Until 2 AM EDT Saturday.

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

* ADDITIONAL DETAILS...The long duration of wind will likely aid 
  in numerous instances of tree damage and power outages.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

VAZ028-031-WVZ050-010030-
/O.CON.KLWX.WI.Y.0008.000000T0000Z-210501T0500Z/
Frederick VA-Clarke-Hampshire-
Including the cities of Winchester, Berryville, and Romney
1229 PM EDT Fri Apr 30 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY...

* WHAT...Northwest winds 20 to 30 mph with gusts up to 55 mp.

* WHERE...In Virginia, Clarke and Frederick Counties including 
  the independent city of Winchester. In West Virginia, 
  Hampshire County.

* WHEN...Until 1 AM EDT Saturday.

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

* ADDITIONAL DETAILS...The long duration of wind will likely aid 
  in numerous instances of tree damage and power outages.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

DHOF
3 follow-up statements
465 
WWUS71 KLWX 010050
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
850 PM EDT Fri Apr 30 2021

DCZ001-MDZ004>006-008-011-013-014-503>508-VAZ053-054-505-506-
010600-
/O.CAN.KLWX.HW.W.0002.000000T0000Z-210501T0600Z/
/O.EXA.KLWX.WI.Y.0008.000000T0000Z-210501T0600Z/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Cecil-Southern Baltimore-Prince Georges-Anne Arundel-
Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Fairfax-Arlington/Falls Church/Alexandria-
Western Loudoun-Eastern Loudoun-
Including the cities of Washington, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Reisterstown, Cockeysville, Elkton, 
Baltimore, Bowie, Suitland-Silver Hill, Clinton, College Park, 
Greenbelt, Laurel, Camp Springs, Glen Burnie, Annapolis, Severn, 
South Gate, Severna Park, Arnold, Odenton, Germantown, Damascus, 
Bethesda, Rockville, Gaithersburg, Silver Spring, Lisbon, 
Columbia, Ellicott City, Jarrettsville, Aberdeen, Reston, 
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia, 
Arlington, Alexandria, Falls Church, Purcellville, Leesburg, 
Ashburn, and Sterling
850 PM EDT Fri Apr 30 2021

...WIND ADVISORY IN EFFECT UNTIL 2 AM EDT SATURDAY...
...HIGH WIND WARNING IS CANCELLED...

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

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

* WHEN...Until 2 AM EDT Saturday.

* 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.

&&

$$

MDZ003-VAZ507-508-WVZ051>053-010200-
/O.CAN.KLWX.HW.W.0002.000000T0000Z-210501T0600Z/
Washington-Northern Virginia Blue Ridge-
Central Virginia Blue Ridge-Morgan-Berkeley-Jefferson-
Including the cities of Hagerstown, Big Meadows, Wintergreen, 
Paw Paw, Martinsburg, Charles Town, and Shepherdstown
850 PM EDT Fri Apr 30 2021

...HIGH WIND WARNING IS CANCELLED...

Winds have diminished considerably.

$$

MDZ501-502-VAZ504-WVZ502>504-506-010200-
/O.CAN.KLWX.HW.W.0002.000000T0000Z-210501T0500Z/
Extreme Western Allegany-Central and Eastern Allegany-
Eastern Highland-Eastern Grant-Western Mineral-Eastern Mineral-
Eastern Pendleton-
Including the cities of Frostburg, Cumberland, Monterey, 
Petersburg, Elk Garden, Antioch, Keyser, New Creek, Ridgeville, 
Russelldale, Headsville, Fort Ashby, Brandywine, Franklin, 
Oak Flat, Ruddle, and Sugar Grove
850 PM EDT Fri Apr 30 2021

...HIGH WIND WARNING IS CANCELLED...

Winds have diminished considerably.

$$

MDZ001-VAZ503-WVZ501-505-010900-
/O.CAN.KLWX.WI.Y.0008.000000T0000Z-210501T0500Z/
/O.CON.KLWX.FZ.W.0003.210501T0400Z-210501T1300Z/
Garrett-Western Highland-Western Grant-Western Pendleton-
Including the cities of Mountain Lake Park, Oakland, Grantsville,
Hightown, Bayard, Mount Storm, and Riverton
850 PM EDT Fri Apr 30 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
EDT SATURDAY...
...WIND ADVISORY IS CANCELLED...

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

* WHERE...In Maryland, Garrett County. In Virginia, Western 
  Highland County. In West Virginia, Western Grant and Western 
  Pendleton Counties.

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

* 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.

&&

$$

VAZ036>040-051-010200-
/O.CAN.KLWX.WI.Y.0008.000000T0000Z-210501T0600Z/
Nelson-Albemarle-Greene-Madison-Rappahannock-Culpeper-
Including the cities of Lovingston, Charlottesville, 
Stanardsville, Madison, Washington, and Culpeper
850 PM EDT Fri Apr 30 2021

...WIND ADVISORY IS CANCELLED...

Winds have diminished considerably.

$$

VAZ025>031-WVZ050-055-010200-
/O.CAN.KLWX.WI.Y.0008.000000T0000Z-210501T0500Z/
Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-
Hampshire-Hardy-
Including the cities of Staunton, Waynesboro, Stuarts Draft, 
Harrisonburg, Strasburg, Woodstock, Mount Jackson, New Market, 
Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville, 
Romney, and Moorefield
850 PM EDT Fri Apr 30 2021

...WIND ADVISORY IS CANCELLED...

Winds have diminished.

$$

MDZ016>018-VAZ052-055-057-501-502-010600-
/O.CON.KLWX.WI.Y.0008.000000T0000Z-210501T0600Z/
Charles-St. Marys-Calvert-Prince William/Manassas/Manassas Park-
Stafford-King George-Northern Fauquier-Southern Fauquier-
Including the cities of St. Charles, Waldorf, Lexington Park, 
California, Chesapeake Beach, Huntingtown, Dunkirk, North Beach, 
Lusby, Prince Frederick, Dale City, Manassas, Woodbridge, 
Lake Ridge, Montclair, Falmouth, Dahlgren, Warrenton, 
and Turnbull
850 PM EDT Fri Apr 30 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY...

* WHAT...Northwest winds 15 to 20 mph with gusts up to 45 mph.

* WHERE...In Maryland, Charles, St. Marys and Calvert Counties. 
  In Virginia, Southern Fauquier, Northern Fauquier, Stafford, 
  King George and Prince William/Manassas/Manassas Park Counties.

* WHEN...Until 2 AM EDT Saturday.

* 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.

&&

$$
005 
WWUS71 KLWX 010551
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
151 AM EDT Sat May 1 2021

DCZ001-MDZ004>006-008-011-013-014-016>018-503>508-VAZ052>055-057-
501-502-505-506-010700-
/O.EXP.KLWX.WI.Y.0008.000000T0000Z-210501T0600Z/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Cecil-Southern Baltimore-Prince Georges-Anne Arundel-Charles-
St. Marys-Calvert-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Northwest Harford-Southeast Harford-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-King George-
Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-
Including the cities of Washington, Frederick, Ballenger Creek, 
Eldersburg, Westminster, Reisterstown, Cockeysville, Elkton, 
Baltimore, 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, 
Lisbon, Columbia, Ellicott City, Jarrettsville, Aberdeen, 
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston, 
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia, 
Arlington, Alexandria, Falls Church, Falmouth, Dahlgren, 
Warrenton, Turnbull, Purcellville, Leesburg, Ashburn, 
and Sterling
151 AM EDT Sat May 1 2021

...WIND ADVISORY WILL EXPIRE AT 2 AM EDT EARLY THIS MORNING...

Winds have dropped below advisory criteria. However, northwesterly
winds could occasionally gust up to 35 mph at times during the
overnight hours. 

$$

MDZ001-VAZ503-WVZ501-505-011300-
/O.CON.KLWX.FZ.W.0003.000000T0000Z-210501T1300Z/
Garrett-Western Highland-Western Grant-Western Pendleton-
Including the cities of Mountain Lake Park, Oakland, Grantsville,
Hightown, Bayard, Mount Storm, and Riverton
151 AM EDT Sat May 1 2021

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

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

* WHERE...In Maryland, Garrett County. In Virginia, Western 
  Highland County. In West Virginia, Western Grant and Western 
  Pendleton Counties.

* WHEN...Until 9 AM EDT this 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.

&&

$$
134 
WWUS71 KLWX 011240
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
840 AM EDT Sat May 1 2021

MDZ001-VAZ503-WVZ501-505-011345-
/O.EXP.KLWX.FZ.W.0003.000000T0000Z-210501T1300Z/
Garrett-Western Highland-Western Grant-Western Pendleton-
Including the cities of Mountain Lake Park, Oakland, Grantsville,
Hightown, Bayard, Mount Storm, and Riverton
840 AM EDT Sat May 1 2021

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

Temperatures are rising.

$$

What forecasters said that day

The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this freeze warning went out at Apr 30, 11:15 AM EDT, 1 hour 14 minutes earlier.

Area forecast discussion, Apr 30, 11:15 AM EDT, 1 hour 14 minutes before
Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
1115 AM EDT Fri Apr 30 2021

.SYNOPSIS...
A secondary cold front will move through today. High pressure
will build in from the Great Lakes over the weekend, then shift
offshore next week as another frontal system approaches from the
west.

&&

.NEAR TERM /THROUGH TONIGHT/...
11:00AM Update: Have upgraded areas in the lee of the Allegheny
Front to a High Wind Warning with the expectation of slightly
higher winds due to acceleration from downsloping effects.

10:00AM Update: Have added most of the DC metro and the Blue
Ridge to the High Wind Warning and make a slide expansion to the
Wind Advisory in central Virginia based on the long duration of
the wind and higher confidence in a slightly strong wind field.

Note that the extended duration of strong winds will likely
result in widespread tree damage and power outages.

Previous discussion...
Persistent cold advection behind the cold front will keep
temperatures close to where they currently are. In spite of mid-
Spring solar insolation, this should easily be countered by the
arrival of cooler air from the northwest. There are a pair of
surges of wind expected in this pattern. This second round of
high wind arrives as a powerful upper trough slides
southeastward through the region during the early evening.
Models show 500-mb winds around 100 knots with 850-mb flow
maximizing in the 50 to 60 knot range. A series of model
soundings show a deeply mixed boundary layer in this gusty post-
frontal air mass. Much of this higher momentum air should easily
mix to the surface leading to gusts around that 50 to 60 knot
threshold. Consequently, the area has been blanketed with High
Wind Warnings and Wind Advisories which run into the overnight
hours. Downed trees, hazardous travel, and power outages are all
possible with such wind fields.

While much of the region remains dry, some shower activity is
anticipated west of I-95 given the pockets of instability aloft.
The convective showers should stay more locked to areas of
terrain with areas downstream in the lee being more compromised
by downsloping flow. However, cannot rule out some of these
afternoon showers making it as far east as the DC metro area.

After multiple days of mild weather this week, a much cooler air
mass arrives in earnest. This will be even more noticeable
across higher elevations of the Allegheny Front. Some spots may
reach the freezing mark tonight which could affect sensitive
vegetation or impact unprotected outdoor plumbing. While lows
are forecast to sit around the freezing mark in these locations,
low to mid 40s will be commonplace elsewhere.

&&

.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
The combination of cool overnight temperatures and residual
breezy winds should make for a chilly start to the month of May.
Forecast wind chills are in the 30s in all locations with teens
and 20s in the higher terrain. Record low temperatures at the
area climate sites are in the low/mid 30s which should remain
safe from being broken. Persistent west-northwesterly winds
will continue to usher in cooler air from central Canada.
Slightly below average temperatures are to be widespread on
Saturday with highs topping out in the mid/upper 60s, locally
cooler in the mountains. However, this will come with abundant
sunshine through the day.

By Saturday evening and into Sunday, winds turn more
southwesterly with the surface anticyclone parked off the
southeastern U.S. coast. Increasing moisture content with the
warm advection will allow for milder overnight conditions along
with a much warmer Sunday. With 850-mb temperatures rising into
the low teens, a well mixed boundary layer would support mid
80s. This seems plausible based on model soundings. Dry
conditions prevail to finish out the weekend with persistent
southwesterly flow bringing Sunday night lows back into the
upper 50s to low 60s.

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...
H5 ridging over the western Atlantic will slowly continue to shift
further eastward through the middle of next week as troughing
continues over the western portions of the CONUS. As a result, high
pressure over Bermuda will continue a southerly flow; allowing for
the continuation of warmer and more humid conditions. Given the
synoptic set-up, waves of low pressure will be ejected eastward
towards the Mid-Atlantic region. This will result in continued
chances for more unsettled weather.

While the first half of Monday looks to remain mostly dry at this
time, a warm front will push northward late Monday into Tuesday as a
wave of low pressure tracks northeastward along the Appalachians.
This will cause the chances for showers to increase Monday afternoon
into Tuesday. As the parent low continues to track further into
northern New England, the associated cold front appears to stall
over West Virginia, allowing a second wave of low pressure to
traverse along it on Wednesday. This second wave appears strong
enough to drag the stalled boundary across the region Wednesday
afternoon/evening, before fully exiting the region by Thursday
morning.

Overall, guidance is in good agreement on the progression of the
synoptic pattern and the timing of the FROPA. Chances for showers
and thunderstorms look more promising on Tuesday and Wednesday
with elevated CAPE and PWAT values. With that being said flooding
threats also cannot be ruled out.

Weak high pressure looks to return briefly for Thursday. However
another low pressure system may impact the region on Friday.
Temperatures cool down to more seasonable levels by late next
week.

&&

.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
VFR conditions expected to persist through the weekend. Strong WNW
winds continue through Friday night where gusts are expected to
range between 25-35 kts during this time. The strongest gusts of
40-50kts are expected between 20Z and 03Z. A few showers or even
a thunderstorm are possible late this afternoon, as well. Gusts
subside by Sat AM but will still remain somewhat gusty, up to
20 kts during Sat afternoon.

VFR conditions expected on Monday. However periods of sub-VFR
conditions may ensue late Monday night through Wednesday as multiple
waves of low pressure pass through the region; resulting in periods
of showers and potential thunderstorms. Winds will remain southerly
during this time.

&&

.MARINE...
A mixture of marine weather headlines are in effect as very
gusty winds arrive with the pressure surge. Gale and Storm
Warnings remain in place into early Saturday morning as a
couple of windy periods affect the area waterways. Being out on
the water will be quite dangerous while these headlines are out.
Residual breezy conditions on Saturday should lead to small
craft conditions for portions of the day as well.

SCA conditions are possible Monday and Tuesday as multiple waves of
low pressure pass through the waters.

&&

.TIDES/COASTAL FLOODING...
Strong NW/offshore flow will cause water levels to decline through
tonight, and will likely result in near blow out tides.

&&

.CLIMATE...
The record warm low temperature for April 29th (Thursday) at
Washington Dulles was tied with a low of 65 degrees. The
previous record of 65 degrees was set in 2017.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...High Wind Warning until 2 AM EDT Saturday for DCZ001.
MD...Freeze Watch from late tonight through Saturday morning for
     MDZ001.
     Wind Advisory until 1 AM EDT Saturday for MDZ001.
     High Wind Warning until 2 AM EDT Saturday for MDZ003>006-008-
     011-013-014-503>508.
     Wind Advisory until 2 AM EDT Saturday for MDZ016>018.
     High Wind Warning until 1 AM EDT Saturday for MDZ501-502.
VA...Freeze Watch from late tonight through Saturday morning for
     VAZ503.
     Wind Advisory until 1 AM EDT Saturday for VAZ025>031-503.
     High Wind Warning until 2 AM EDT Saturday for VAZ507-508.
     High Wind Warning until 2 AM EDT Saturday for VAZ053-054-505-
     506.
     Wind Advisory until 2 AM EDT Saturday for VAZ036>040-051-052-
     055-057-501-502.
     High Wind Warning until 1 AM EDT Saturday for VAZ504.
WV...Freeze Watch from late tonight through Saturday morning for
     WVZ501-505.
     Wind Advisory until 1 AM EDT Saturday for WVZ050-055-501-505.
     High Wind Warning until 2 AM EDT Saturday for WVZ051>053.
     High Wind Warning until 1 AM EDT Saturday for WVZ502>504-506.
MARINE...Storm Warning until 6 AM EDT Saturday for ANZ530>532-535-
     538>540.
     Gale Warning until 6 AM EDT Saturday for ANZ533-534-536-537-
     541>543.

&&

SYNOPSIS...BRO/DHOF
NEAR TERM...BRO/DHOF
SHORT TERM...BRO
LONG TERM...MSS
AVIATION...MSS/DHOF
MARINE...MSS/BRO/DHOF
TIDES/COASTAL FLOODING...LWX
CLIMATE...LWX
Hazardous weather outlook, Apr 30, 11:14 AM EDT, 1 hour 15 minutes before
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
1114 AM EDT Fri Apr 30 2021

ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508-
VAZ052>057-011515-
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-
1114 AM EDT Fri Apr 30 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...This Afternoon and Tonight

A High Wind Warning is in effect for the Baltimore MD and
Washington D.C. Metropolitan areas through this evening. A Wind
Advisory is in effect for southern Maryland and the Fredericksburg
area in Virginia.

A Storm Warning is in effect for the Maryland Chesapeake Bay north
of North Beach MD and the upper tidal Potomac River through
tonight. A Gale Warning is in effect for the remainder of the
waters during this time.

There is an enhanced threat for the spread of fires due to gusty
winds and low relative humidity this afternoon, mainly in the
Fredericksburg area of Virginia.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Please send any wind reports to the National Weather Service.

MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
WVZ050>053-055-011515-
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-
1114 AM EDT Fri Apr 30 2021

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

.DAY ONE...This Afternoon and Tonight

A High Wind Warning is in effect for portions of northern and
central Maryland as well as portions of the eastern Panhandle of
West Virginia and the DC metro area in northern Virginia late
this morning through this evening. A Wind Advisory is in effect
for much of the rest of the area through this evening.

There is an enhanced threat for the spread of fires due to gusty
winds and low relative humidity this afternoon, mainly across
portions of the central Virginia piedmont.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Please send any wind reports to the National Weather Service.

MDZ001-501-502-VAZ503-504-WVZ501>506-011515-
Garrett-Extreme Western Allegany-Central and Eastern Allegany-
Western Highland-Eastern Highland-Western Grant-Eastern Grant-
Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
1114 AM EDT Fri Apr 30 2021

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

.DAY ONE...This Afternoon and Tonight

A High Wind Warning is in effect in the lee of the Allegheny Front
through this evening, with a Wind Advisory elsewhere.

A Freeze Watch is in effect starting at midnight for the higher
elevations of the Alleghenies.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The Freeze Watch continues through 9 AM Saturday morning.

.SPOTTER INFORMATION STATEMENT...

Please send any wind reports to the National Weather Service.

DHOF

In the hours before

Local storm report, Apr 30, 12:04 PM EDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1204 PM EDT FRI APR 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1152 AM     NON-TSTM WND DMG 2 WNW COCKEYSVILLE      39.49N  76.67W
04/30/2021                   BALTIMORE          MD   DEPT OF HIGHWAYS

            A TREE BLEW DOWN ON SOUTHBOUND I-83
            BALTIMORE-HARRISBURG EXPRESSWAY NEAR EXIT 20A FOR SHAWAN
            ROAD.

&&

EVENT NUMBER LWX2103853

DH
Local storm report, Apr 30, 12:07 PM EDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1207 PM EDT FRI APR 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1153 AM     NON-TSTM WND DMG 2 SSE ARNOLD            39.01N  76.49W
04/30/2021                   ANNE ARUNDEL       MD   DEPT OF HIGHWAYS

            A TREE BLEW DOWN ON WESTBOUND/SOUTHBOUND US-50/US-301
            JOHN HANSON HIGHWAY NEAR EXIT 27A FOR MD-2/MD-450
            GOVERNOR RITCHIE HIGHWAY.

&&

EVENT NUMBER LWX2103854

DH
Local storm report, Apr 30, 12:10 PM EDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1210 PM EDT FRI APR 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1206 PM     NON-TSTM WND DMG 2 WNW HAGERSTOWN        39.65N  77.75W
04/30/2021                   WASHINGTON         MD   DEPT OF HIGHWAYS

            A TREE BLEW DOWN ON NORTHBOUND I-81 NEAR MILE MARKER 6.

&&

EVENT NUMBER LWX2103855

DH
Local storm report, Apr 30, 12:12 PM EDT, 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1212 PM EDT FRI APR 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1208 PM     NON-TSTM WND DMG 4 ENE PARK MILLS        39.31N  77.33W
04/30/2021                   FREDERICK          MD   DEPT OF HIGHWAYS

            A TREE BLEW DOWN ON MD-355 URBANA PIKE NEAR DOCTOR
            PERRY ROAD/BIG WOODS ROAD.

&&

EVENT NUMBER LWX2103856

DH
Local storm report, Apr 30, 12:19 PM EDT, 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1219 PM EDT FRI APR 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1207 PM     NON-TSTM WND DMG WASHINGTON              38.91N  77.02W
04/30/2021                   DISTRICT OF COLUMB DC   BROADCAST MEDIA

            WIRES BLEW DOWN ON VA-685 SWINKS MILL ROAD AT VA-694
            LEWINSVILLE ROAD.

&&

EVENT NUMBER LWX2103857

DH
Special weather statement, Apr 30, 12:26 PM EDT, 3 minutes before
Special Weather Statement
National Weather Service Baltimore MD/Washington DC
1226 PM EDT Fri Apr 30 2021

VAZ036>040-051-052-055-057-501-502-507-508-010000-
Nelson-Albemarle-Greene-Madison-Rappahannock-Culpeper-
Prince William/Manassas/Manassas Park-Stafford-King George-
Northern Fauquier-Southern Fauquier-Northern Virginia Blue Ridge-
Central Virginia Blue Ridge-
Including the cities of Lovingston, Charlottesville,
Stanardsville, Madison, Washington, Culpeper, Dale City,
Manassas, Woodbridge, Lake Ridge, Montclair, Falmouth, Dahlgren,
Warrenton, Turnbull, Big Meadows, and Wintergreen
1226 PM EDT Fri Apr 30 2021

...Enhanced Threat for Fire Spread through early this evening...

Dry fuels, low relative humidity, and strong northwesterly wind
gusts will produce favorable conditions for wildfire spread from
early this afternoon into the early evening. This is mainly for
areas east of the Blue Ridge in central and northern Virginia.
Wind gusts up to 50 mph are expected today, while slightly
decreasing into the night. Moderate recoveries are likely tonight
with humidity values staying in the 40 to 50 percent range.

Residents are urged to exercise caution handling any potential
ignition source, including machinery, cigarettes, and matches. Be
sure to properly discard all smoking materials. Any dry grasses
and tree litter that ignite will have the potential to spread
quickly.

DHOF

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 8:18 PM EDTHigh Wind WarningLWXAllegany, Anne Arundel, Baltimore, Carroll, Cecil, Frederick and 6 more25 hr
Apr 29, 8:18 PM EDTWind AdvisoryLWXAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 8 more30 hr
Apr 30, 4:31 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll, Frederick, Howard, Montgomery, Washington29 min
Apr 30, 4:39 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Charles, Howard, Montgomery, Prince George's36 min
Apr 30, 5:11 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Calvert, Charles, Prince George's, Saint Mary's34 min
Apr 29, 8:36 PM EDTStorm WarningLWX24 hr
Apr 29, 10:32 PM EDTSpecial Marine WarningLWX99 min
Apr 29, 10:34 PM EDTSpecial Marine WarningLWX116 min
Apr 29, 11:20 PM EDTSpecial Marine WarningLWX115 min
Apr 29, 11:25 PM EDTSpecial Marine WarningLWX2 hr
Apr 29, 11:53 PM EDTSpecial Marine WarningLWX2 hr
Apr 30, 12:09 AM EDTSpecial Marine WarningLWX2 hr
Apr 30, 12:24 PM EDTRed Flag WarningLWXOrange, Spotsylvania, City of Fredericksburg7 hr
Apr 30, 4:36 PM EDTSpecial Marine WarningLWX59 min
Apr 30, 4:38 PM EDTSpecial Marine WarningLWX49 min
Apr 30, 5:05 PM EDTSpecial Marine WarningLWX45 min
Apr 30, 5:08 PM EDTSpecial Marine WarningLWX54 min

Nearby

Freeze Warnings in West Virginia, 2021Freeze Warnings in Virginia, 2021Freeze Warnings in Maryland, 2021Every freeze warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.