Vienna, VA

4:12 PM EDT on July 21, 2017 (GMT -0400)
Whispering Wind Court Southeast | | Change Station
Active Advisory: Heat Advisory, Air Quality Alert

Elev 400 ft 38.90 °N, 77.26 °W | Updated 3 minutes ago

Partly Cloudy
Partly Cloudy
96.3 °F
Feels Like 113 °F
N
1.2
Wind Variable Wind from WNW
Gusts 4.3 mph

Today
High -- | Low -- °F
--% Chance of Precip.
Yesterday
High -- | Low -- °F
Precip. -- in
Pressure 29.91 in
Visibility 10.0 miles
Clouds Few 4800 ft
Scattered Clouds 10000 ft
Mostly Cloudy 25000 ft
Heat Index 113 °F
Dew Point 78 °F
Humidity 55%
Rainfall 0.00 in
Snow Depth Not available.
6:00 AM 8:29 PM
Waning Crescent, 4% visible
METAR KIAD 211952Z 23005KT 10SM FEW048TCU SCT100 BKN250 33/22 A2992 RMK AO2 SLP128 TCU ALQDS T03280217
Pressure 29.91 in
Visibility 10.0 miles
Clouds Few 4800 ft
Scattered Clouds 10000 ft
Mostly Cloudy 25000 ft
Heat Index 113 °F
Dew Point 78 °F
Humidity 55%
Rainfall 0.00 in
Snow Depth Not available.
6:00 AM 8:29 PM
Waning Crescent, 4% visible
METAR KIAD 211952Z 23005KT 10SM FEW048TCU SCT100 BKN250 33/22 A2992 RMK AO2 SLP128 TCU ALQDS T03280217

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10-Day Weather Forecast

Almanac

Astronomy

Jul. 21, 2017 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

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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

Heat Advisory
Issued: 12:36 PM EDT Jul. 21, 2017 – National Weather Service

... Heat advisory remains in effect until 8 PM EDT this evening...

* heat index values... up to 106 due to temperatures in the mid
90s, and dewpoints around 70.

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

Precautionary/preparedness actions...

A heat advisory means that a period of high temperatures is
expected. The combination of high temperatures and high humidity
will create a situation in which heat illnesses are possible.

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.




Air Quality Alert
Issued: 4:35 PM EDT Jul. 20, 2017 – National Weather Service

... Air quality alert is in effect for Friday July 21 2017...

The metropolitan Washington Council of governments in association
with Maryland department of the environment, Virginia department
of environmental quality, and district department of environment
has issued a code Orange air quality alert Friday for
the DC Metro area.

A code Orange air quality alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, people
suffering from asthma, heart disease or other lung diseases and
the elderly. The effects of air pollution can be minimized by
avoiding strenuous activity or exercise outdoors.

For more information on ground-level ozone and fine
particles... visit www.Cleanairpartners.Net.



435 PM EDT Thu Jul 20 2017

... Air quality alert is in effect for Friday July 21 2017...

The metropolitan Washington Council of governments in association
with Maryland department of the environment, Virginia department
of environmental quality, and district department of environment
has issued a code Orange air quality alert Friday for
the DC Metro area.

A code Orange air quality alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, people
suffering from asthma, heart disease or other lung diseases and
the elderly. The effects of air pollution can be minimized by
avoiding strenuous activity or exercise outdoors.

For more information on ground-level ozone and fine
particles... visit www.Cleanairpartners.Net.