Special Marine Warning 21, NWS Baltimore/Washington

970 
FZUS71 KLWX 221913
MWSLWX

Marine Weather Statement
National Weather Service Baltimore MD/Washington DC
313 PM EDT Thu Apr 22 2021

ANZ531-532-538>540-222015-
/O.CON.KLWX.MA.W.0021.000000T0000Z-210422T2015Z/
313 PM EDT Thu Apr 22 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 415 PM EDT...

For the following areas...
Chesapeake Bay from Pooles Island to Sandy Point MD...
Chesapeake Bay from Sandy Point to North Beach MD...
Chester River to Queenstown MD...
Eastern Bay...
Patapsco River including Baltimore Harbor...

At 311 PM EDT, showers over the Bay continue to cause sporadic 35 to 
40 knot gusts.

HAZARD...Wind gusts 34 knots or greater.

SOURCE...Observed Wind.

IMPACT...Boaters in small craft could be thrown overboard by 
         suddenly higher winds and waves capsizing their vessel.

Locations impacted include...
North Point State Park, Chester River, Eastern Bay, Pooles Island,
Greenbury Point, Shady Side, Herring Bay, Highland Beach, Gunpowder
River, Sandy Point State Park, Severn River, Bloody Point Light,
Thomas Point Light, Poplar Island, Parsons Island, Fort Smallwood
State Park, Hart Miller Island, Gibson Island, Bodkin Point and
Tolchester Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3940 7630 3930 7628 3927 7621 3915 7628
      3914 7628 3903 7624 3900 7617 3897 7625
      3879 7619 3885 7627 3873 7634 3870 7655
      3899 7649 3902 7640 3913 7645 3926 7665
      3930 7660 3923 7643 3932 7635 3940 7637
TIME...MOT...LOC 1911Z 294DEG 13KT 3897 7615 

HAIL...0.00IN
WIND...>34KTS

$$

ADM

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
202 PM EDT Thu Apr 22 2021

.SYNOPSIS...
High pressure will settle over the Carolinas through Friday. Low
pressure will pass through central or southern Virginia and Maryland
this weekend, then high pressure will return early next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
A deep upper-level low is spinning over northern New England
with a trailing trough axis pivoting over the Middle Atlantic.
A weak surface trough is evident near I-95 marked by little more
than a drop in dew point temperatures.

Northwesterly breezes should subside rather quickly this evening
with the onset of nocturnal cooling and as the better pressure
gradient begins to lift away. With the departing trough, expect
clearing conditions overnight as well. This is expected to
result in widespread temperatures near or a few degrees below
freezing and areas of frost overnight.

&&

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
High pressure will settle over the Carolinas Friday before
moving offshore Friday night. Temperatures will moderate rather
noticeably with highs well into the 60s expected.

Clouds will begin to increase late Friday night well ahead of
low pressure approaching from the central US. This should keep
temperatures milder compared to previous nights with no
additional frost or freeze concerns anticipated.

Low pressure is expected to track near or just south of the
area over the weekend bringing a soaking rain. There remains
some uncertainty as to the exact rainfall amounts, but a general
average of half to one inch looks most likely Saturday afternoon
and night. Slightly higher amounts could result in some minor
flooding issues, but that threat should be mitigated due to the
recent dry weather. A slightly further north track of the low
would draw some marginally unstable air and the threat for a few
gusty thunderstorms into southern parts of the CWA, but the
threat for that looks low as well at the moment.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
Low pressure will exit the region Sunday morning which may
result in some residual damp conditions during the early morning
hours. However, high pressure will quickly build back into the
region. Therefore, do expect conditions to quickly dry out by
the midday. Winds will also become quite gusty Sunday afternoon
as a result of a tightening pressure gradient.

Thereafter, the high will gradually slide southward from the
Great Lakes region which will keep the region dry through
midweek. As the high migrates further south, a warming trend
will ensue as a result of southerly flow. Temperatures will
begin to gradually warm during this time as we will likely see
summer-like temperatures by Wednesday.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
W/NW gusts of 25 to 30 kt should diminish quickly this eve, w/
additional gusts of 20 to 25 kt possible for northern terminals
Friday. Low pressure will approach Saturday bringing rain and
sub-VFR conditions as well as a more southerly wind.

CIG/VSBY restrictions are likely to persist early Sunday
morning. However do expect conditions to quickly return to VFR
by midday Sunday. Gusty NW winds will develop by Sunday
afternoon as a result of a tightening gradient. High pressure
will remain in control throughout much of next week, resulting
in continued VFR conditions.

&&

.MARINE...
West to northwest wind gusts should diminish steadily overnight,
though another uptick is possible Friday. The Small Craft
Advisory may need to be extended/expanded as a result.

Low pressure will approach Saturday with rain arriving later in
the day. The wind will turn more southerly ahead of low
pressure, and could become gusty over the lower tidal Potomac
River and middle portion of the Chesapeake Bay.

SCA to perhaps Gale conditions are likely Sunday as a result of
a tightening gradient between the departing low offshore and
high pressure building back into the region. Sub-SCA conditions
are likely to persist throughout the remainder of next week as
high pressure regains control.

&&

.FIRE WEATHER...
Min RH of 25-35% and wind gusts of 15-25 MPH are possible Friday
afternoon. Despite recent green-up, 10-hr fuel moistures are
running 7-12%. This may aid in the potential for rapid fire
spread during this time. A soaking rain should bring that threat
to a quick end over the weekend.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...Frost Advisory from 2 AM to 9 AM EDT Friday for DCZ001.
MD...Freeze Warning from 2 AM to 9 AM EDT Friday for MDZ003>006-
     503>507.
     Frost Advisory from 2 AM to 9 AM EDT Friday for MDZ008-011-013-
     014-016>018-508.
VA...Freeze Warning from 2 AM to 9 AM EDT Friday for VAZ025>031-
     036>040-050>053-055-056-501-502-505>508.
     Frost Advisory from 2 AM to 9 AM EDT Friday for VAZ054-057.
WV...Freeze Warning from 2 AM to 9 AM EDT Friday for WVZ051>053.
MARINE...Small Craft Advisory until 6 AM EDT Friday for ANZ530>534-
     536>543.
     Small Craft Advisory from 6 PM this evening to midnight EDT
     tonight for ANZ535.
     Gale Warning until 6 PM EDT this evening for ANZ535.

&&

SYNOPSIS...DHOF
NEAR TERM...DHOF
SHORT TERM...DHOF
LONG TERM...MSS
AVIATION...MSS/DHOF
MARINE...MSS/DHOF
FIRE WEATHER...DHOF

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
1207 PM EDT Thu Apr 22 2021

ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508-
VAZ052>057-231615-
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-
1207 PM EDT Thu Apr 22 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 Gale Warning is in effect for the upper tidal Potomac River
until 6 PM.

A Freeze Warning is in effect for areas mainly west of Interstate
95 tonight, with a Frost Advisory near and east of Interstate 95.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

The Frost and Freeze headlines are in effect through 9 AM Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
WVZ050>053-055-231615-
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-
1207 PM EDT Thu Apr 22 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 Freeze Warning is in effect tonight for areas where the growing
season has started.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

The Freeze Warning is in effect until 9 AM Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MDZ001-501-502-VAZ503-504-WVZ501>506-231615-
Garrett-Extreme Western Allegany-Central and Eastern Allegany-
Western Highland-Eastern Highland-Western Grant-Eastern Grant-
Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
1207 PM EDT Thu Apr 22 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

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

DHOF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
935 AM EDT THU APR 22 2021

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

0600 AM     SNOW             E MOUNTAIN LAKE PARK    39.40N  79.37W
04/22/2021  M0.2 INCH        GARRETT            MD   COCORAHS

            24-HOUR SNOWFALL.

0600 AM     SNOW             1 SW MILL GAP           38.31N  79.72W
04/22/2021  M0.3 INCH        HIGHLAND           VA   CO-OP OBSERVER

            24-HOUR SNOWFALL.

0700 AM     SNOW             BAYARD                  39.27N  79.37W
04/22/2021  M0.8 INCH        GRANT              WV   CO-OP OBSERVER

            24-HOUR SNOWFALL.

0700 AM     SNOW             4 SW MC HENRY           39.52N  79.41W
04/22/2021  M0.2 INCH        GARRETT            MD   CO-OP OBSERVER

            24-HOUR SNOWFALL.

&&

EVENT NUMBER LWX2103826
EVENT NUMBER LWX2103827
EVENT NUMBER LWX2103828
EVENT NUMBER LWX2103829

DH