Thornhill, VA

1:54 AM EDT on July 20, 2019 (GMT -0400)
Woodberry Farm | | Change Station

Elev 308 ft 38.12 °N, 77.94 °W | Updated 8 minutes ago

Clear
Clear
77.5 °F
Feels Like 79 °F
N
0
Wind Variable Wind from SSE
Gusts 0.0 mph

Today
High -- | Low -- °F
--% Chance of Precip.
Yesterday
High -- | Low -- °F
Precip. -- in
Pressure 29.94 in
Visibility 10.0 miles
Clouds Clear
Heat Index 79 °F
Dew Point 75 °F
Humidity 91%
Rainfall 0.00 in
Snow Depth Not available.
6:04 AM 8:31 PM
Waning Gibbous, 90% visible
METAR KOMH 200535Z AUTO 00000KT 10SM CLR 24/23 A2994 RMK AO2
Pressure 29.94 in
Visibility 10.0 miles
Clouds Clear
Heat Index 79 °F
Dew Point 75 °F
Humidity 91%
Rainfall 0.00 in
Snow Depth Not available.
6:04 AM 8:31 PM
Waning Gibbous, 90% visible
METAR KOMH 200535Z AUTO 00000KT 10SM CLR 24/23 A2994 RMK AO2

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10-Day Weather Forecast

Almanac

Astronomy

Jul. 20, 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

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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

Excessive Heat Warning, Excessive Heat Watch
Issued: 10:52 PM EDT Jul. 19, 2019 – National Weather Service

... Excessive heat warning remains in effect from 11 am to 9 PM
EDT Saturday...
... Excessive heat watch remains in effect from Sunday morning
through Sunday evening...

* heat index values... up to 115 due to temperatures around 100,
and dewpoints in the mid 70s.

* Impacts... dangerously high temperatures and humidity could
quickly cause heat stress or heat stroke if precautions are
not taken.

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.

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.

An excessive heat watch means that a prolonged period of
dangerously high temperatures is possible. Prepare for extreme
temperatures and high humidity which would create a situation in
which heat illnesses are expected.

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.