Glen Arm, MD (21057)

8:49 PM EDT on July 21, 2019 (GMT -0400)
Greenwood | | Change Station

Elev 390 ft 39.44 °N, 76.49 °W | Updated 5 seconds ago

Partly Cloudy
Partly Cloudy
88.2 °F
Feels Like 109 °F
N
5
Wind Variable Wind from SE
Gusts 5.0 mph

Today
High -- | Low -- °F
--% Chance of Precip.
Yesterday
High -- | Low -- °F
Precip. -- in
Pressure 29.84 in
Visibility 10.0 miles
Clouds Scattered Clouds 20000 ft
Heat Index 109 °F
Dew Point 82 °F
Humidity 83%
Rainfall 0.00 in
Snow Depth Not available.
5:55 AM 8:28 PM
Waning Gibbous, 77% visible
METAR KMTN 212345Z 24003KT 10SM SCT200 36/23 A2984
Pressure 29.84 in
Visibility 10.0 miles
Clouds Scattered Clouds 20000 ft
Heat Index 109 °F
Dew Point 82 °F
Humidity 83%
Rainfall 0.00 in
Snow Depth Not available.
5:55 AM 8:28 PM
Waning Gibbous, 77% visible
METAR KMTN 212345Z 24003KT 10SM SCT200 36/23 A2984

Get Your Daily Forecast Email!

Thanks for signing up!

Be on the lookout for a verification email in your inbox.

You'll start receiving severe weather alerts in your inbox..

×

10-Day Weather Forecast

Almanac

Astronomy

Jul. 21, 2019 Rise Set
Actual Time
Civil Twilight
Nautical Twilight
Astronomical Twilight
Moon
Length of Visible Light
Length of Day
Tomorrow will be .
, % of the Moon is Illuminated

Today's Extremes

State Highs State Lows

Community

WunderPhotos

Category 6

Welcome to Category 6. This is the collective home for Weather Underground's featured writeups by Dr. Jeff Masters (right), Bob Henson (left), Chris Burt, and other regular contributors.

Nearby

Air Quality

  Air Quality AQ Index Pollutant
Not available.

Snow Depth

Station Depth Elevation

Earthquake Activity

City Distance Mag. Time & Date
Minimum magnitude displayed is 2.5.

Coastal Water Temperatures

Place Temperature

Stations

Nearby Weather Stations

Station Location Temp. Windchill Dew Point Humidity Wind Precip. Elev Updated Type
                   

Watches & Warnings

Severe Thunderstorm Warning
Issued: 8:46 PM EDT Jul. 21, 2019 – National Weather Service

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
northwestern Harford County in northern Maryland...
north central Baltimore County in northern Maryland...

* until 930 PM EDT.

* At 846 PM EDT, severe thunderstorms were located along a line
extending from Stewartstown to 8 miles east of Hampstead, moving
east at 15 mph.

Hazard... 60 mph wind gusts.

Source... radar indicated.

Impact... damaging winds will cause some trees and large branches
           to fall. This could injure those outdoors, as well as
           damage homes and vehicles. Roadways may become blocked by
           downed trees. Localized power outages are possible.
           Unsecured light objects may become projectiles.

* Locations impacted include...
Jarrettsville, Pylesville, Bentley Springs, Cardiff, Chrome Hill,
Norrisville, Parkton, street, rocks and Whiteford.

Precautionary/preparedness actions...

For your protection move to an interior room on the lowest floor of a
building.


Lat... Lon 3959 7645 3963 7671 3972 7663 3972 7632
time... Mot... loc 0046z 277deg 12kt 3974 7657 3962 7669

Hail... <.75in
wind... 60mph


Mm


826 PM EDT sun Jul 21 2019

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
southeastern Carroll County in north central Maryland...
northwestern Baltimore City in northern Maryland...
northeastern Howard County in central Maryland...
west central Harford County in northern Maryland...
western Baltimore County in northern Maryland...

* until 915 PM EDT.

* At 825 PM EDT, severe thunderstorms were located along a line
extending from near Railroad to near Gamber to near Sykesville,
moving east at 20 mph.

Hazard... 60 mph wind gusts.

Source... radar indicated.

Impact... damaging winds will cause some trees and large branches
           to fall. This could injure those outdoors, as well as
           damage homes and vehicles. Roadways may become blocked by
           downed trees. Localized power outages are possible.
           Unsecured light objects may become projectiles.

* Locations impacted include...
Baltimore, Pikesville, Cockeysville, historic Ellicott City,
Ellicott City, Towson, Woodlawn, Randallstown, Owings Mills,
Eldersburg, Milford mill, Reisterstown, Lochearn, Mays chapel,
Timonium, Fallston, Hampstead, Hampton, Sykesville and
Jarrettsville.

Precautionary/preparedness actions...

For your protection move to an interior room on the lowest floor of a
building.


Lat... Lon 3961 7643 3940 7661 3928 7682 3935 7713
      3949 7695 3966 7678
time... Mot... loc 0025z 288deg 18kt 3969 7667 3948 7689 3938 7703

Hail... <.75in
wind... 60mph


Mm


Flash Flood Watch
Issued: 2:48 PM EDT Jul. 21, 2019 – National Weather Service

... Flash Flood Watch in effect from Monday afternoon through late
Monday night...

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Watch for portions of Maryland, the District of
Columbia, Virginia, and Panhandle West Virginia, including the
following areas, in Maryland, Anne Arundel, Carroll, central
and southeast Howard, central and southeast Montgomery,
Frederick MD, northern Baltimore, northwest Harford, northwest
Howard, northwest Montgomery, Prince Georges, southeast
Harford, southern Baltimore, and Washington. The District of
Columbia. In Virginia, Arlington/Falls Church/Alexandria,
Clarke, eastern Loudoun, Fairfax, Frederick VA, Prince
William/Manassas/Manassas Park, and western Loudoun. In
Panhandle West Virginia, Berkeley, Jefferson, and Morgan.

* From Monday afternoon through late Monday night

* multiple rounds of showers and thunderstorms capable of
producing heavy rainfall are likely. Areal average rainfall of 1
to 1.5 inches is expected, with isolated totals of 4 inches
possible. Much of this rain may fall in short periods of time
in any one given location, resulting in the risk for flash
flooding Monday afternoon into Monday night.

Precautionary/preparedness actions...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should flash flood warnings be issued.



Dhof


Excessive Heat Warning
Issued: 2:48 PM EDT Jul. 21, 2019 – National Weather Service

... Excessive heat warning remains in effect until 9 PM EDT this
evening...

* heat index values... around 110 due to temperatures in the upper
90s, and dewpoints in the lower 70s.

* Impacts... the heat and humidity may cause heat stress during
outdoor exertion or extended exposure.

Precautionary/preparedness actions...

An excessive heat warning means that a prolonged period of
dangerously high temperatures will occur. The combination of
extreme temperatures and high humidity will create a dangerous
situation in which heat illnesses are expected. Check in on
relatives and neighbors.

Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work, the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency - call 911.