Sterling, VA

3:15 PM EDT on July 21, 2019 (GMT -0400)
Ashburn | | Change Station

Elev 272 ft 39.00 °N, 77.50 °W | Updated 14 seconds ago

Mostly Cloudy
Mostly Cloudy
98.4 °F
Feels Like 108 °F
N
4.9
Wind Variable Wind from WNW
Gusts 8.0 mph

Today
High -- | Low -- °F
--% Chance of Precip.
Yesterday
High -- | Low -- °F
Precip. -- in
Pressure 29.87 in
Visibility 10.0 miles
Clouds Mostly Cloudy 5000 ft
Heat Index 108 °F
Dew Point 72 °F
Humidity 43%
Rainfall 0.00 in
Snow Depth Not available.
6:01 AM 8:31 PM
Waning Gibbous, 79% visible
SPECI KIAD 211908Z 29007G18KT 10SM BKN050 37/21 A2987 RMK AO2 T03720211
Pressure 29.87 in
Visibility 10.0 miles
Clouds Mostly Cloudy 5000 ft
Heat Index 108 °F
Dew Point 72 °F
Humidity 43%
Rainfall 0.00 in
Snow Depth Not available.
6:01 AM 8:31 PM
Waning Gibbous, 79% visible
SPECI KIAD 211908Z 29007G18KT 10SM BKN050 37/21 A2987 RMK AO2 T03720211

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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

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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

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.