Weather Alert
Chesapeake Weather Warning NWS WEATHER ALERT FOR THE CHESAPEAKE, VA AREA - Issued: 420 PM EDT Sat Oct 10 2026 Chesapeake Weather Warning

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Chesapeake, VA Weather Warnings

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Chesapeake Weather Advisories

WEATHER ALERT
Issue Date: 420 PM EDT Sat Oct 10 2026
This Hazardous Weather Outlook is for southeast Maryland, northeast North Carolina, eastern Virginia and southeast Virginia.

DAY ONE
Tonight. Hazardous weather is not expected at this time.

DAYS TWO THROUGH SEVEN
Sunday through Friday. There is a marginal risk for tornadoes and damaging winds late Sunday afternoon into Sunday evening. Additionally, locally heavy rainfall and localized flash flooding is possible Sunday.

SPOTTER INFORMATION STATEMENT
Spotter activation may be needed.

FLOOD STATEMENT
Issue Date: 320 PM EDT Sat Oct 10 2026

COASTAL FLOOD STATEMENT IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY AFTERNOON
WHAT
Up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways.
WHERE
Portions of east central, eastern and southeast Virginia.
WHEN
From Sunday morning through Sunday afternoon.
IMPACTS
Shallow flooding is possible in the most vulnerable locations near the waterfront and shoreline.
PRECAUTIONARY/PREPAREDNESS ACTIONS
Do not drive through flooded roadways. && Time of high total tides are approximate to the nearest hour. GYWNNS ISLAND VA MLLW CATEGORIES - MINOR 3.0 FT, MODERATE 3.5 FT, MAJOR 4.0 FT MHHW CATEGORIES - MINOR 1.6 FT, MODERATE 2.1 FT, MAJOR 2.6 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/11 PM 1.9 0.6 0.4 1 NONE 11/12 PM 2.6 1.2 0.9 1 NONE 11/11 PM 1.9 0.6 0.6 1 NONE 12/12 PM 2.1 0.8 0.4 1 NONE 13/12 AM 1.7 0.4 0.4 1 NONE WEST POINT VA MLLW CATEGORIES - MINOR 5.0 FT, MODERATE 6.0 FT, MAJOR 7.0 FT MHHW CATEGORIES - MINOR 1.5 FT, MODERATE 2.5 FT, MAJOR 3.5 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 11/12 AM 4.5 1.0 1.2 1 NONE 11/12 PM 5.0 1.5 1.2 1 MINOR 12/01 AM 4.4 0.9 1.2 1 NONE 12/01 PM 4.5 1.0 0.8 1 NONE 13/01 AM 4.2 0.7 1.1 1 NONE WARE RIVER AT SCHLEY VA MLLW CATEGORIES - MINOR 4.5 FT, MODERATE 5.5 FT, MAJOR 6.5 FT MHHW CATEGORIES - MINOR 1.8 FT, MODERATE 2.8 FT, MAJOR 3.8 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 3.3 0.6 0.4 1 NONE 11/10 AM 4.3 1.6 0.9 1 NONE 11/10 PM 3.3 0.6 0.4 1 NONE 12/11 AM 3.3 0.6 0.0 1 NONE 12/11 PM 3.2 0.5 0.5 1 NONE 13/11 AM 3.8 1.1 0.6 1 NONE YORKTOWN VA MLLW CATEGORIES - MINOR 4.5 FT, MODERATE 5.0 FT, MAJOR 5.5 FT MHHW CATEGORIES - MINOR 1.9 FT, MODERATE 2.4 FT, MAJOR 2.9 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 3.6 1.0 0.8 2 NONE 11/10 AM 4.4 1.8 1.3 3 NONE 11/10 PM 3.3 0.7 0.7 2 NONE 12/11 AM 3.5 0.9 0.4 1 NONE 13/12 AM 3.2 0.6 0.7 1 NONE 13/12 PM 3.6 1.0 0.6 1 NONE JAMES RIVER AT SCOTLAND/JAMESTOWN VA MLLW CATEGORIES - MINOR 4.0 FT, MODERATE 4.5 FT, MAJOR 5.0 FT MHHW CATEGORIES - MINOR 1.8 FT, MODERATE 2.3 FT, MAJOR 2.8 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/02 PM 3.1 0.9 0.8 1 NONE 11/01 AM 3.3 1.1 0.9 1 NONE 11/01 PM 3.9 1.7 1.2 1 NONE 12/01 AM 3.1 0.9 0.8 1 NONE 12/02 PM 2.8 0.6 0.1 1 NONE 13/02 AM 2.7 0.5 0.5 1 NONE MONEY POINT VA MLLW CATEGORIES - MINOR 5.0 FT, MODERATE 6.0 FT, MAJOR 7.0 FT MHHW CATEGORIES - MINOR 1.8 FT, MODERATE 2.8 FT, MAJOR 3.8 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 4.1 0.9 0.8 1 NONE 11/10 AM 4.7 1.5 1.0 1 NONE 11/11 PM 3.8 0.6 0.6 1 NONE 12/11 AM 4.0 0.8 0.3 1 NONE 12/11 PM 3.9 0.7 0.8 1 NONE 13/12 PM 4.3 1.1 0.7 1 NONE ELIZABETH RIVER AT MIDTOWN TUNNEL VA MLLW CATEGORIES - MINOR 5.0 FT, MODERATE 6.0 FT, MAJOR 7.0 FT MHHW CATEGORIES - MINOR 2.0 FT, MODERATE 3.0 FT, MAJOR 4.0 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 4.2 1.2 0.9 1 NONE 11/10 AM 4.7 1.7 1.1 1 NONE 11/11 PM 3.8 0.8 0.6 1 NONE 12/11 AM 4.0 1.0 0.3 1 NONE 12/11 PM 3.9 0.9 0.8 1 NONE 13/12 PM 4.3 1.3 0.7 1 NONE WESTERN BRANCH OF THE ELIZABETH RIVER VA MLLW CATEGORIES - MINOR 5.0 FT, MODERATE 6.0 FT, MAJOR 7.0 FT MHHW CATEGORIES - MINOR 2.0 FT, MODERATE 3.0 FT, MAJOR 4.0 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 4.2 1.2 1.0 1 NONE 11/10 AM 4.7 1.7 1.1 1 NONE 11/11 PM 3.8 0.8 0.7 1 NONE 12/11 AM 4.0 1.0 0.5 1 NONE 12/11 PM 3.9 0.9 0.9 1 NONE 13/12 PM 4.3 1.3 1.0 1 NONE ELIZABETH RIVER AT GRANDY VILLAGE VA MLLW CATEGORIES - MINOR 5.0 FT, MODERATE 6.0 FT, MAJOR 7.0 FT MHHW CATEGORIES - MINOR 2.0 FT, MODERATE 3.0 FT, MAJOR 4.0 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 4.2 1.2 0.9 1 NONE 11/10 AM 4.7 1.7 1.1 1 NONE 11/11 PM 3.8 0.8 0.6 1 NONE 12/11 AM 4.0 1.0 0.3 1 NONE 12/11 PM 3.9 0.9 0.8 1 NONE 13/12 PM 4.3 1.3 0.7 1 NONE FORT MONROE VA MLLW CATEGORIES - MINOR 4.5 FT, MODERATE 5.5 FT, MAJOR 6.5 FT MHHW CATEGORIES - MINOR 1.7 FT, MODERATE 2.7 FT, MAJOR 3.7 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 3.9 1.1 1.0 2-3 NONE 11/10 AM 4.5 1.7 1.1 3 MINOR 11/10 PM 3.5 0.7 0.6 2-3 NONE 12/11 AM 3.6 0.8 0.3 2 NONE 12/11 PM 3.5 0.7 0.8 1-2 NONE 13/11 AM 3.9 1.1 0.9 1 NONE SEWELLS POINT VA MLLW CATEGORIES - MINOR 4.5 FT, MODERATE 5.5 FT, MAJOR 6.5 FT MHHW CATEGORIES - MINOR 1.7 FT, MODERATE 2.7 FT, MAJOR 3.7 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 3.8 1.0 0.9 2 NONE 11/10 AM 4.4 1.6 1.1 2 NONE 11/10 PM 3.4 0.6 0.6 2 NONE 12/11 AM 3.5 0.7 0.2 2 NONE 12/11 PM 3.4 0.6 0.7 1 NONE 13/11 AM 3.8 1.0 0.7 1 NONE LEEWARD MARINA - NEWPORT NEWS VA MLLW CATEGORIES - MINOR 4.5 FT, MODERATE 5.5 FT, MAJOR 6.5 FT MHHW CATEGORIES - MINOR 1.7 FT, MODERATE 2.7 FT, MAJOR 3.7 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/10 PM 3.9 1.1 0.8 1 NONE 11/11 AM 4.4 1.6 0.8 1 NONE 11/11 PM 3.7 0.9 0.7 1 NONE 12/12 PM 3.9 1.1 0.4 1 NONE 13/12 AM 3.7 0.9 0.8 1 NONE 13/11 AM 3.9 1.1 0.7 1 NONE SMITHFIELD, VA MLLW CATEGORIES - MINOR 3.5 FT, MODERATE 4.0 FT, MAJOR 4.5 FT MHHW CATEGORIES - MINOR 0.7 FT, MODERATE 1.2 FT, MAJOR 1.7 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/11 PM 2.8 0.0 -0.5 1 NONE 11/12 PM 3.5 0.7 -0.3 1 MINOR 12/12 AM 2.5 -0.3 -0.7 1 NONE 12/12 PM 2.7 -0.1 -1.0 1 NONE 13/01 AM 2.6 -0.2 -0.5 1 NONE NANSEMOND RIVER AT SLEEPY HOLE PARK VA MLLW CATEGORIES - MINOR 5.5 FT, MODERATE 7.0 FT, MAJOR 8.0 FT MHHW CATEGORIES - MINOR 2.4 FT, MODERATE 3.9 FT, MAJOR 4.9 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/11 PM 4.0 0.9 0.4 1 NONE 11/11 AM 4.9 1.8 0.7 1 NONE 11/11 PM 3.7 0.6 0.2 1 NONE 12/12 PM 4.0 0.9 -0.1 1 NONE 13/12 AM 3.7 0.6 0.3 1 NONE 13/12 PM 4.3 1.2 0.3 1 NONE NANSEMOND RIVER AT SUFFOLK VA MLLW CATEGORIES - MINOR 5.5 FT, MODERATE 7.0 FT, MAJOR 8.0 FT MHHW CATEGORIES - MINOR 2.0 FT, MODERATE 3.5 FT, MAJOR 4.5 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 11/12 AM 4.6 1.1 1.0 1 NONE 11/12 PM 5.4 1.9 1.2 1 NONE 12/12 AM 4.2 0.7 0.7 1 NONE 12/01 PM 4.6 1.1 0.5 1 NONE 13/01 AM 4.2 0.7 0.8 1 NONE CHESAPEAKE BAY BRIDGE TUNNEL VA MLLW CATEGORIES - MINOR 5.0 FT, MODERATE 5.5 FT, MAJOR 6.0 FT MHHW CATEGORIES - MINOR 2.1 FT, MODERATE 2.6 FT, MAJOR 3.1 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/09 PM 3.6 0.7 0.6 4 NONE 11/09 AM 4.6 1.7 1.1 5 NONE 11/09 PM 3.5 0.6 0.7 3 NONE 12/10 AM 3.8 0.9 0.3 3 NONE 12/10 PM 3.7 0.8 0.9 2 NONE 13/10 AM 4.0 1.1 0.7 1 NONE LITTLE CREEK AT EAST BEACH MARINA VA MLLW CATEGORIES - MINOR 4.5 FT, MODERATE 5.0 FT, MAJOR 6.0 FT MHHW CATEGORIES - MINOR 1.7 FT, MODERATE 2.2 FT, MAJOR 3.2 FT TOTAL TOTAL DEPARTURE DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD FT MLLW FT MHHW FT FT IMPACT -------- --------- --------- --------- ------- -------- 10/09 PM 3.4 0.6 0.4 1 NONE 11/09 AM 4.2 1.4 0.7 1 NONE 11/10 PM 3.1 0.3 0.2 1 NONE 12/10 AM 3.6 0.8 0.1 1 NONE 12/10 PM 3.3 0.5 0.5 1 NONE 13/11 AM 3.8 1.0 0.4 1 NONE &&

Chesapeake, VA Weather Warnings, Advisories and Alerts are issued by the National Weather Service.
E-mail these weather warnings to yourself, family or friends!

Weather Warnings Explained

National Weather Service criteria for issuing Watches / Warnings / Advisories:

  • Watches: 50% confidence of meeting Warning criteria (generally within 36-48+ hours).
  • Advisories and Warnings: 80% confidence in the event occurrence (generally within 24-36 hours).

Weather Warnings Glossary

Severe Weather Warnings Winter Warnings Tropical Warnings Flood Warnings Wind Warnings Heat Warnings Cold Warnings Marine Warnings Fire Warnings Fog/Smoke/Pollution Advisories
Severe Thunderstorm Watch

A Severe Thunderstorm Watch is issued when severe thunderstorms are possible in and near the watch area. It does not mean that they will occur. It only means they are possible.

Severe thunderstorms are defined as follows:

1) Winds of 58 mph/93 km/h or higher

AND/OR

2) Hail 1 inch/2.54 cm in diameter or larger.

Severe Thunderstorm Warning

A Severe Thunderstorm Warning is issued when severe thunderstorms are occurring or imminent in the warning area.

Severe thunderstorms are defined as follows:

1) Winds of 58 mph/93 km/h or higher

AND/OR

2) Hail 1 inch/2.54 cm in diameter or larger.

Thunderstorms with wind gusts greater than or equal to 58 mph/93 km/h (50 kts) and/or hail greater than or equal to 1 inch/2.54 cm in diameter and/or a tornado.

Tornado Watch

A Tornado Watch is issued when severe thunderstorms and tornadoes are possible in and near the watch area. It does not mean that they will occur. It only means they are possible.

Severe thunderstorms are defined as follows:

1) Winds of 58 mph/93 km/h or higher

AND/OR

2) Hail 1 in/2.54 cm in diameter or larger.

Likelihood of a tornado within the given area based on radar or actual sighting; usually accompanied by conditions indicated above for "Severe Thunderstorm Warning".

A Tornado Warning is issued when a tornado is imminent. When a tornado warning is issued, seek safe shelter immediately.

Winter Storm Warning

When any of the following is expected within the next 12 to 36 hours.

More than one predominant hazard.

  • Winter weather event having more than one predominant hazard {ie. heavy snow and blowing snow (below blizzard conditions), snow and ice, snow and sleet, sleet and ice, or snow, sleet and ice} meeting or exceeding warning criteria for at least one of the precipitation elements.
Snow, Ocean Effect Snow, or Sleet.

A Blizzard Warning means that the following conditions are occurring or expected within the next 12 to 18 hours.
1) Snow and/or blowing snow reducing visibility to ¼ mile/.4 km or less for 3 hours or longer
AND
2)  Sustained winds of 35 mph/56 km/h or greater or frequent gusts to 35 mph/56 km/h or greater.
There is no temperature requirement that must be met to achieve blizzard conditions.

½ inch/1.27 cm or greater accretion of freezing rain in any zone.

When any of the following is expected within the next 12 to 24 hours.

More than one predominant hazard.

Winter weather event having more than one predominant hazard (i.e., snow and ice, snow and sleet, or snow, ice & sleet) meeting or exceeding advisory criteria for at least one of the precipitation elements, but remaining below warning criteria.

  • Snow, Ocean Effect Snow, and/or Sleet
    3 inches/7.6 cm averaged over a forecast zone in 12 hours.
  • Snow and Blowing Snow
    Sustained or frequent gusts of 25 to 34 mph/40 to 54 km/h accompanied by falling and blowing snow occasionally reducing visibility to less than or equal to ¼ mi/.4 km for less than 3 hours.
  • Widespread or localized blowing snow reducing visibility to less than or equal to ¼ mi/.4 km with winds less than 35 mph/56 km/h.
  • Freezing Rain
    Any accretion of freezing rain or freezing drizzle on road surfaces.
  • Black Ice
    A Special Weather Statement will usually be issued when sufficient moisture is expected to cause a thin layer of ice on road surfaces, typically on cloudless nights ("black ice"). At forecaster discretion a formal Winter Weather Advisory may be issued instead.
Hurricane Warning

Sustained winds greater than or equal to 74 mph/120 km/h (greater than or equal to 64 kts) (no gust criteria) associated with a hurricane expected to affect a coastal or inland zone within 36 hours.

Sustained winds 39-73 mph/62-117 km/h (34-63 kts) (no gust criteria) associated with a tropical storm expected to affect a coastal or inland zone within 36 hours.

Short-fused warning for onset of extreme winds, defined as sustained at 111+ mph/178+ km/h (equivalent to a Category 3+ hurricane).
This is typically used for the approach of the eyewall of a major landfalling hurricane.

When the danger of life-threatening inundation from rising water moving inland from the shoreline somewhere within the specified area, generally within 36 hours, is in association with a tropical, subtropical, or post-tropical cyclone.

Flash Flood Warning

Rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above a predetermined flood level, beginning within a short timeframe from the onset of heavy rain.

A dam or levee failure, or water released from an ice jam is also considered.

Expected overflow or inundation by water which causes or will cause damage and/or a threat to life.

Water level at a River Forecast point along a main stem river is expected to reach or exceed flood stage.

Expected inundation by water of some low lying and poor drainage areas, resulting in a nuisance to the public but not a threat to life and property.

A Coastal Flood Warning is issued when moderate to major coastal flooding is occurring or imminent. This flooding will pose a serious risk to life and property.

Minor coastal flooding expected. Examples include: splashover that causes a few roads to be briefly impassable, standing water in parking lots, etc.

A Coastal Flood Advisory is issued when minor or nuisance coastal flooding is occurring or imminent.

High Wind Warning

Sustained winds greater than or equal to 40 mph/64 km/h (greater than or equal to 35 kts) for at least 1 hour; OR any gusts greater than or equal to 58 mph/93 km/h (greater than or equal to 50 kts).

Sustained winds 31-39 mph/49-62 km/h (27-34 kts) for at least 1 hour; OR any gusts to 46-57 mph/74-91 km/h (40-49 kts).

Excessive Heat Warning

Daytime heat indices of greater than or equal to 105°F/40°C for 2 or more hours.

Daytime heat indices of 95°F-99°F/35°C-37°C for 2 or more hours over 2 consecutive days, or 100°F-104°F/37°C-40°C for 2 or more hours over 1 day.

Issued for non-criteria warning/advisory heat. A heat wave is defined as 3 or more days of greater than or equal to 90°F/32°C temperatures.

Freeze Warning

When minimum shelter temperature drops to less than or equal to 32°F/0°C during growing season.

Issued under clear, light wind conditions with forecast minimum shelter temperature 33-36°F/0-2°C during growing season.

Wind chill index less than or equal to -25°F/-31°C for at least 3 hours using only sustained wind.

Wind chill index between -15°F/-26°C and -24°F/-31°C for at least 3 hours using only the sustained wind.

Special Marine Warning

Brief/sudden occurrence of sustained wind or frequent gusts greater than or equal to 34 kts/39 mph/63 km/h, usually associated with thunderstorms, and/or hail greater than or equal to ¾ inch/1.91 cm in diameter; also issued for waterspouts.

Sustained winds or frequent gusts greater than or equal to 64 kts/74 mph/119 km/h (greater than 2 hrs) within 24 hours from a non-tropical system (marine only).

Sustained winds or frequent gusts 48-63 kts/55-72 mph/88-116 km/h (greater than 2 hrs) within 24 hours from a non-tropical system (marine only).

Sustained winds or frequent gusts 34-47 kts/39-55 mph/63-88 km/h (greater than 2 hrs) within 24 hrs from a non-tropical system (marine only).

Small Craft Advisory

Sustained winds or frequent gusts 25-33 kts/29-38 mph/47-61 km/h (greater than 2 hrs) AND/OR Seas greater than or equal to 5 feet/1.52 meters within 24 hours (marine only).

When high surf poses a danger to life in the form of rip currents or breaking seas. Generally issued when 7+ foot/2.3+ meters incoming seas reported at the buoys from Memorial Day through September.

When conditions yield ice accumulation rates less than 2 cm/hr ( 0.8 inch/hour). Favorable conditions for ice accumulation occur when air temperatures over the waters are less than or equal to 23°F/-5°C and sustained winds greater than or equal to 25 kts/29 mph/47 km/h and sea surface temperatures less than or equal to 43°F/6°C and seas greater than or equal to 4 feet/1.22 meters.

When conditions yield ice accumulation rates greater than or equal to 2 cm/hr ( 0.8 inch/hr ). Favorable conditions for ice accumulation occur when air temperatures over the waters are less than or equal to 23°F/-5°C and sustained winds greater than or equal to 25 kts/29 mph/47 km/h and sea surface temperatures less than or equal to 43°F/6°C and seas greater than or equal to 4 feet/1.22 meters.

Red Flag Warning

High degree of confidence that dry fuels and weather conditions support extreme fire danger within 24 hours using the following criteria as a guide:

  • Winds sustained or with frequent gusts greater than or equal to 25 mph/40 km/h.
  • Relative Humidity at or below 30% anytime during the day.
  • Rainfall amounts for the previous 5 days less than ¼ inch/.64 cm (except 3 days in pre-greenup).
  • Lightning after an extended dry period.
  • Significant dry frontal passage.
  • Dry thunderstorms.
  • Keetch-Byram Drought Index values of 300 or greater (summer only).
Dense Fog Advisory

Widespread visibility less than or equal to ¼ mile/.4 km for at least 3 hours.

Very light ice accumulation from predominantly fog at or below freezing temperatures.

Widespread or localized smoke reducing visibilities to ¼ mile/.4 km or less.

Atmospheric conditions stable enough to cause air pollutants to accumulate in a given area. Criteria developed in conjunction with the local or state EPA and the product issued at their request.

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