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Weather warning for dangerous waves
A Hazardous Seas Warning is issued by the National Weather Service of the United States when wave heights and/or wave steepness values reach certain criteria
Hazardous_seas_warning
Terminology used by the National Weather Service to describe severe weather in the US
move to stable waters or dock. Warning criteria may vary depending on the NWS Weather Forecast Office. Hazardous seas watch MWS – A rough surf event—regardless
Severe weather terminology (United States)
Severe_weather_terminology_(United_States)
Meteorological warning about a coming storm
At sea, a storm warning is a warning issued by the National Weather Service of the United States when winds between 48 and 63 knots (89 and 117 km/h;
Storm_warning
Type of weather warning
A winter storm warning (SAME code: WSW) is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National Weather Service (NWS)
Winter_storm_warning
Type of wind warning
THE WINDS WILL BEGIN TO DIMINISH LATE SUNDAY NIGHT. * SEAS...SHORT-PERIOD AND STEEP HAZARDOUS SEAS BETWEEN 10 AND 12 FEET WILL DEVELOP SATURDAY AFTERNOON
Small_craft_advisory
Weather warning and advisory
A Hazardous Seas Watch is issued by the National Weather Service of the United States when there is an increased threat of high wave heights and/or wave
Hazardous_seas_watch
Weather warning indicating an observed severe thunderstorm
producing only weak rotation, it will only yield hazardous weather warranting a severe thunderstorm warning. However, the public will usually be advised this
Severe_thunderstorm_warning
Substances harmful to people, property or the environment
transported are known as hazardous materials (syllabically abbreviated as HAZMAT or hazmat). An example of dangerous goods is hazardous waste which is waste
Dangerous_goods
Weather warning issued by the U.S. National Weather Service
An extreme heat warning is a notice issued by the National Weather Service of the United States when extremely dangerous heat is expected or occurring
Extreme_heat_warning
Term used by meteorologists indicating conditions favorable for wildfire development
A red flag warning is a forecast warning issued by the National Weather Service (NWS) in the United States to inform the public, firefighters, and land
Red_flag_warning
Weather warning indicating blizzard conditions in the warned area
A blizzard warning (SAME code: BZW) is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National Weather Service (NWS) in
Blizzard_warning
Weather warning for freezing rain and ice accumulation
An ice storm warning is a hazardous weather statement issued by the Weather Forecast Offices of the National Weather Service in the United States which
Ice_storm_warning
Weather warning indicating imminent danger of tornadoes
A tornado warning (SAME code: TOR) is a public warning that is issued by weather forecasting agencies to an area in the path of a tornado, or a severe
Tornado_warning
Type of weather warning
A heavy snow warning is a hazardous weather statement issued by the Weather Forecast Offices of the National Weather Service (NWS) in the United States
Heavy_snow_warning
Severe weather-related terminology used by the Meteorological Service of Canada
the public to the potential for hazardous weather conditions, and typically serve as a lead-up to a warning. Warnings are issued when severe weather is
Severe weather terminology (Canada)
Severe_weather_terminology_(Canada)
U.S. National Weather Service alert
accumulations at least 24 hours before a storm that has a risk of being hazardous. The watch is typically issued 12 to 48 hours before the storm's expected
Winter_storm_watch
Weather warning
* SEAS....COMBINED SEAS WILL REACH 28 TO 30 FEET EARLY MONDAY MORNING...POSSIBLY HIGHER...THEN EASE TO AROUND 20 FEET BY EARLY MONDAY EVENING. SEAS WILL
Hurricane_force_wind_warning
Type of warning issued by the US National Weather Service
A freeze warning issued in United States is a warning issued by the National Weather Service when the temperature is going to be projected as below 32 °F
Freeze_warning
Weather warning for short-term bursts of blowing snow affecting visibility
A snow squall warning (SAME code: SQW) is a bulletin issued by Environment Canada's Meteorological Service of Canada and the National Weather Service
Snow_squall_warning
Levels of alert issued to areas threatened by a tropical cyclone
Tropical cyclone warnings and watches are alerts issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of
Tropical cyclone warnings and watches
Tropical_cyclone_warnings_and_watches
Storm warning phrase
wording occasionally used by the National Weather Service in their watch and warning messages to convey heightened urgency for a severe weather event that is
Particularly dangerous situation
Particularly_dangerous_situation
Alert systems for volcanic activity
"warning", if a highly hazardous eruption is underway or imminent. These levels reflect conditions at a volcano and the expected or ongoing hazardous volcanic
Volcano warning schemes of the United States
Volcano_warning_schemes_of_the_United_States
Weather forecast including a warning of a gale-force winds
the Beaufort scale. Gale warnings (and gale watches) allow mariners to take precautionary actions to ensure their safety at sea or to seek safe anchorage
Gale_warning
Beach in the Hawaiian islands known for its deadly currents
Hanakāpīʻai conditions even more hazardous; in the event that one gets caught in a rip current (or otherwise swept out to sea) the nearest safe shore area
Hanakāpīʻai_Beach
Weather warning in the United States and Canada
An extreme cold warning is a weather warning issued by Environment and Climate Change Canada (ECCC) and by the United States' National Weather Service
Extreme_cold_warning
Type of weather advisory
winds from decaying thunderstorms), to advise of ongoing or imminent hazardous convective weather expected to occur within the geographical area over
Special_weather_statement
Weather warning in the United States
A dust storm warning (SAME code: DSW) is issued by the National Weather Service in the United States when blowing dust is expected to frequently reduce
Dust_storm_warning
Type of emergency alert issued in the United States
A Civil Danger Warning (SAME code: CDW) is a warning issued through the Emergency Alert System (EAS) in the United States to warn the public of an event
Civil_danger_warning
sub-saturated air, whereas fog or mist indicates full saturation. hazardous seas warning hazardous seas watch heat dome The effect created by Earth's atmosphere
Glossary_of_meteorology
Weather warning indicating observed or imminent flash flooding in the area
A flash flood warning (SAME code: FFW) is a severe weather warning product of the National Weather Service that is issued by national weather forecasting
Flash_flood_warning
Weather radio network in the United States
which solely incorporate watch, warning and Special Weather Statements, and any active Short-Term Forecasts and Hazardous Weather Outlooks. These are additional
NOAA_Weather_Radio
Severe weather statement indicating an observed violent tornado in the warned area
A tornado emergency is an enhanced version of a tornado warning, which is used by the National Weather Service (NWS) in the United States during imminent
Tornado_emergency
Warning for areas expected to experience surface winds of at least 100 knots
An extreme wind warning (SAME code EWW) is an alert issued by the National Weather Service for areas on land that will experience sustained surface winds
Extreme_wind_warning
the Sea and Atmosphere (IPMA) has issued Orange Warnings for the Madeira Archipelago due to extreme wind gusts reaching 120 km/h and "very rough" seas with
2025–26 European windstorm season
2025–26_European_windstorm_season
Strong wind
typically issue gale warnings when winds of this strength are expected. In the United States, a gale warning is specifically a maritime warning; the land-based
Gale
Weather warning indicating areal flooding has been observed or is imminent
A flood warning or flood alert is the task of making use of flood forecasts to make decisions about whether warnings should be issued to the general public
Flood_warning
Weather advisory in the United States
In National Weather Service (NWS) terminology, a Hazardous Weather Outlook is a weather statement issued to provide information of potential severe weather
Hazardous_weather_outlook
2026 windstorm over northwestern Europe
gusts reaching 100 km/h and heavy localised rainfall. The storm generated hazardous maritime swells along the coast, particularly disrupting travel and caused
Storm_Harry
Fire statement indicating an observed wildfire in the warned area
A fire warning (SAME code: FRW) is a warning issued through the Emergency Alert System (EAS) in the United States by civil authorities to inform the public
Fire_warning
supplement warnings and advisories. Weather advisories and warnings are issued when potentially hazardous weather is occurring or is forecast for the short-term
Severe weather terminology (Japan)
Severe_weather_terminology_(Japan)
Weather warning
FREEZING SPRAY WARNING MEANS HEAVY FREEZING SPRAY IS EXPECTED TO RAPIDLY ACCUMULATE ON VESSELS. THESE CONDITIONS CAN BE EXTREMELY HAZARDOUS TO NAVIGATION
Heavy_freezing_spray_warning
Type of weather warning
A lake effect snow warning is a bulletin issued by the National Weather Service in the United States to warn of heavy snowfall accumulations that are
Lake_effect_snow_warning
Strait on the western Canada–United States border
heavy overfalls are hazardous at all times and become very dangerous in strong winds or heavy seas with Environment Canada warning that the resulting steep
Dixon_Entrance
U.S. forecasting agency of the National Oceanic and Atmospheric Administration
federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weather-related products to organizations and
National_Weather_Service
Weather statement issued by the U.S. National Weather Service indicating severe weather
Winter Storm Warning (the latter being issued for frozen precipitation events portending amounts significant enough to cause hazardous conditions for
Winter_weather_advisory
2026 windstorm over northwestern Europe
Germany, warning passengers against travel as tracks were blocked by snow and ice. Hamburg Airport cancelled around 40 flights amid hazardous weather conditions
Storm_Goretti
Warning statement issued in the United States by the National Weather Service
A rip current statement is a warning statement issued by the National Weather Service of the United States when there is a high threat of rip currents
Rip_current_statement
Weather alerts in Hong Kong
Hong Kong tropical cyclone warning signals are issued by the Hong Kong Observatory to warn of a potential threat or effects of a tropical cyclone in the
Hong Kong tropical cyclone warning signals
Hong_Kong_tropical_cyclone_warning_signals
Weather watch indicating a risk of tornadoes
depending on storm cell intensity, the probability exists for other hazardous phenomena exceeding regional severe criterion to occur: severe thunderstorms
Tornado_watch
US-based weather statement
advisory (formerly known as a wind chill advisory until October 2024) is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National
Cold_weather_advisory
Flood warning issued by the National Weather Service of the United States
A coastal flood warning is a hazardous weather statement issued by the Weather Forecast Offices of the National Weather Service in the United States which
Coastal_flood_warning
Weather statement indicating high heat index values
Lake wind advisory Gale Watch Warning Storm Watch Warning Hurricane-force wind Warning Watch Hazardous seas Watch Warning Freezing spray Freezing spray
Heat_advisory
U.S. hazardous weather warning
A significant weather advisory was a hazardous weather statement issued by certain Weather Forecast Offices (WFO) of the National Weather Service (NWS)
Significant_weather_advisory
Weather warning indicating river-stem flooding has been observed or is imminent
A river flood warning is issued by the National Weather Service of the United States when forecast points with formal river gaging sites and established
River_flood_warning
2024 windstorm over northwestern Europe
combined with high spring tides where an orange wind warning was issued place. This hazardous weather event could lead to several impacts including,
Storm_Ashley
Weather advisory in the United States
the storm is judged to be dangerous by local forecasters, a winter storm warning for heavy snow and blowing snow may be issued. A similar bulletin is issued
Blowing_snow_advisory
Black sand beach in Iceland
interventions. The beach has a warning system with condition-dependent safety zones for cautioning visitors during hazardous conditions, such as sneaker
Reynisfjara
Weather advisory in the United States
of the sun, and check up on relatives and neighbors. && $$ Extreme heat warning Severe weather terminology (United States) National Weather Service. "Extreme
Extreme_heat_watch
Type of identification
below, e.g. yellow for hazardous substance Name of the substance/content, e.g. NATURAL GAS Flow direction indicator arrows, ⇒ Warning symbols, e.g. GHS symbol
Pipe_marking
Former American and Canadian weather warning
A wind chill warning was a hazardous weather statement previously issued by both local forecast offices of the National Weather Service (NWS) in the United
Wind_chill_warning
Specialized radio receiver for weather forecasts
Early Warning Programme Warning system Indian Ocean Tsunami Warning System Tsunami warning system Earthquake warning system Earthquake Early Warning (Japan)
Weather_radio
Damaging and Deadly South Pacific cyclone in 2026
low-lying areas. Strong Wind Warnings were also in effect for coastal and marine zones, where rough seas and hazardous swells were expected. Authorities
Cyclone_Urmil_(2026)
Weather advisory in the United States
Secure outdoor objects. && $$ Gale warning Hurricane force wind warning Lake wind advisory Small craft advisory Storm warning "Wind Advisory". Glossary - National
Wind_advisory
Weather advisory in the United States
forecast offices when windy conditions on area lakes are expected to be hazardous for boaters and other recreational events on or around lakes. URGENT -
Lake_wind_advisory
Weather phenomenon
boundary layer Sea smoke Warnings about lake-effect snow: United States: Lake effect snow advisory Lake effect snow watch Lake effect snow warning Severe weather
Lake-effect_snow
Weather advisory in the United States
WIDESPREAD ACCUMULATIONS OF ICE ARE NOT ANTICIPATED...TRAVEL COULD BECOME HAZARDOUS AS ICY SPOTS DEVELOP ON THE ROADS AND BRIDGES. KSZ001>004-013>016-029-NEZ079>081-181800-
Freezing_rain_advisory
Environmental disaster
the Arabian Sea on May 25, near Kochi due to flooding in one of its compartments. The vessel was carrying 640 containers, including hazardous materials
2025_Kerala_oil_spill
Notice warning of sub-freezing temperatures within 48 hours
conditions could kill crops and other sensitive vegetation. && $$ Freeze warning Severe weather terminology (United States) "2018 [KHGX] HOUSTON/GALVESTON
Freeze_watch
Weather advisory in the United States
Lake wind advisory Gale Watch Warning Storm Watch Warning Hurricane-force wind Warning Watch Hazardous seas Watch Warning Freezing spray Freezing spray
Ashfall_advisory
Public warning of a tsunami approaching
WARNING CENTER EWA BEACH HI 101 AM HST SUN October 28, 2012 TO - CIVIL DEFENSE IN THE STATE OF HAWAII SUBJECT - TSUNAMI ADVISORY THE TSUNAMI WARNING IS
Tsunami_advisory
Public advice of risk of severe storms
thunderstorm watch, like a tornado watch, is not to be confused with a warning. A watch encourages the public to remain vigilant—to be on the watch, so
Severe_thunderstorm_watch
Microscopic solid or liquid matter suspended in the Earth's atmosphere
matter(PM) generated by deterioration of building materials". Journal of Hazardous Materials. 437 129290. Elsevier BV. Bibcode:2022JHzM..43729290Y. doi:10
Particulate_matter
Type of flooding
tsunamis and the turmoil of coastal flooding. Coastal flood advisory, watch, warning (U.S.) Coastal management Flash flood Saltwater intrusion Ramsay & Bell
Coastal_flooding
System used in industry to eliminate or minimize exposure to hazards
employee training, and installation of signs and warning labels, such as those in the Workplace Hazardous Materials Information System.Administrative controls
Hierarchy_of_hazard_controls
Weather advisory in the United States
to Weather Forecast Offices for outlining tropical cyclone watches and warnings and impacts, and is their most visible product during such events. Descriptions
Hurricane_local_statement
Federal law in the United States
The Hazardous Materials Transportation Act (HMTA), enacted in 1975, is the principal federal law in the United States regulating the transportation of
Hazardous Materials Transportation Act
Hazardous_Materials_Transportation_Act
Material affixed to a container or article with printed information
recognised standards. In many countries, hazardous products such as poisons or flammable liquids must have a warning label. Labels may be used for any combination
Label
Weather advisory in the United States
FRIDAY NIGHT. THE SMALL CRAFT ADVISORY FOR THIS AFTERNOON HAS BEEN CANCELLED. SEAS HAVE SUBSIDED BELOW 7 FEET ACROSS THE GULF STREAM THIS AFTERNOON. A STRONG
Gale_watch
Weather watch indicating conditions favorable of the development of flash flooding
the near future. Countries such as Australia also issue similarly worded warnings. Flash Flood Watch for the islands of Hawaii An example of the EAS activation
Flash_flood_watch
Weather research laboratory
warning for hazardous mesoscale weather events throughout the United States. One of the new warning methodologies being tested in the NOAA Hazardous Weather
National Severe Storms Laboratory
National_Severe_Storms_Laboratory
Bulletin issued by the National Weather Service
effect snow). The criteria for amounts may vary over different county warning areas. On October 2, 2017, issuance of the Lake Effect Snow Watch has been
Lake_effect_snow_watch
formerly operated electromagnetic warfare aircraft (typically airborne early warning and control aircraft) used by the United States. As such there will be
List of United States electronic warfare aircraft
List_of_United_States_electronic_warfare_aircraft
Genus of venomous fish
fish native to the Indo-Pacific. They are characterized by conspicuous warning coloration with red or black bands and ostentatious dorsal fins tipped
Lionfish
US Air Force General Surveillance Radar station in Alaska
by ship along with the airmen. High winds, rain, and heavy seas made the operation hazardous to all involved. During the first year, supplies and food
Cape Lisburne Air Force Station
Cape_Lisburne_Air_Force_Station
Former U.S. weather alert
watch varies from state to state or from National Weather Service county warning areas to another, but if forecasters believe conditions are favorable for
Wind_chill_watch
Category 5 Atlantic hurricane in 2025
tropical storm conditions, with roads flooding and rough seas. The Bahamas was buffeted with rough seas and thunderstorms from Erin. Localized flooding occurred
Hurricane_Erin_(2025)
Weather advisory in the United States
VISIT... HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE) Lake effect snow warning Severe weather terminology (United States) National Weather Service. "Lake
Lake_effect_snow_advisory
Weather statement warning of flooding
"Glossary - NOAA's National Weather Service". "IEM :: Valid Time Event Code (VTEC) App". Severe weather terminology (United States) Flash Flood Warning
Urban and small stream flood advisory
Urban_and_small_stream_flood_advisory
Notice installed in a public place
by the National Fire Protection Association for warning first responders to hazards posed by hazardous materials stored in a building or facility. The
Placard
Pacific typhoon in 2019
(70 mph) persisted throughout the night into early February 25, as seas remained hazardous. In Santa Rita, manholes were overflowed by flooding. Merizo also
Typhoon_Wutip_(2019)
United States Air Force radar station
extreme cold made repairs hazardous. Ice 16 inches thick built up on the cables in winter. The 710th Aircraft Control and Warning Squadron (AC&W Sq), activated
Tin City Long Range Radar Site
Tin_City_Long_Range_Radar_Site
Wildfire season in Washington, United States
experience. The Air Quality Index reached "hazardous" in Spokane, the worst of six levels; it had reached hazardous the day before in Newport, Washington,
2017_Washington_wildfires
United Kingdom health and safety legislation
not effectively handled by a standard safety sign, such as blocking off hazardous areas, marking of traffic routes or use of acoustic or light signal for
Health and Safety (Safety Signs and Signals) Regulations 1996
Health_and_Safety_(Safety_Signs_and_Signals)_Regulations_1996
Megathrust earthquake in Russia
Tsunami Warning Center (PTWC) warned of "hazardous tsunami waves" along the coasts of Russia and Japan. Authorities in Russia also issued tsunami warnings for
2025_Kamchatka_earthquake
Weather advisory in the United States
winter storm warning or winter weather advisory for blowing snow (depending on accumulation amounts) or upgraded to a blizzard warning. On October 2
Blizzard_watch
Initiative on toxic substances
hotels, apartment complexes, retail stores, banks, and restaurants, warning about hazardous chemicals in items for sale, or present in the immediate environment
1986 California Proposition 65
1986_California_Proposition_65
Australian biologist
circa 2012 to early 2019. She developed a system to predict blooms of the hazardous Irukandji jellyfish in north Queensland. She led a team that discovered
Lisa-ann_Gershwin
Weather statement indicating river-stem flooding has been observed or is imminent
Flood Advisory (FLS)" (PDF). Appendix H – Products Examples – Watches, Warnings, Advisories, and Statements. Retrieved 17 May 2011. National Weather Service
River_flood_advisory
Situation or object that can cause harm
dam failures) or the materials used in their construction prove to be hazardous. Societal hazards can arise from civil disorders, explosive remnants of
Hazard
Ongoing armed conflict in West Asia
Guard Corps (IRGC) issued warnings forbidding passage through the strait, boarded and attacked merchant ships, and laid sea mines in the strait. From
2026_Iran_war
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