20181212
07314000
1.0
TRUE
<div style=" margin-left: 20px; margin-right: 20px;">
<b>Last Revised:</b> April 2018
<br>
<h4>Map Information</h4>
<p>
This nowCOAST™ time-enabled map service provides maps depicting the
geographic coverage of the latest NOAA/National Weather Service (NWS) Watches,
Warnings, Advisories, and Statements for long-duration hazardous weather,
marine weather, and hydrological, oceanographic, wildfire, air quality, and
ecological conditions which may affect or are presently affecting inland,
coastal, and maritime areas. A few examples include Gale Watch, Gale Warning,
High Surf Advisory, High Wind Watch, Areal Flood Warning, Coastal Flood Watch,
Winter Storm Warning, Wind Chill Advisory, Frost Advisory, Tropical Storm
Watch, Red Flag Warning, Air Stagnation Warning, and Beach Hazards Statement.
A complete list is given in the Background Information section below.
</p>
<p>
The coverage areas of these products are usually defined by county or
sub-county boundaries, but for simplicity and performance reasons, adjacent
WWAs of the same type, issuance, and expiration are depicted in this service as
unified (merged/dissolved) polygons in the layers indicated with the suffix
"(Dissolved Polygons)". However, a set of equivalent layers containing the
original individual zone geometries are also included for querying purposes,
and are indicated with the suffix "(Zone Polygons)". Corresponding zone polygon
and dissolved polygon layers are matched together in group layers for each WWA
category. The zone polygon layers are included in this service only to support
query/identify operations (e.g., in order to retrieve the original zone
geometry or other attributes such as a URL to the warning text bulletin) and
thus will not be drawn when included in a normal map image request. <b>Thus, the
dissolved polygon layers should be used when requesting a map image (e.g. WMS
GetMap or ArcGIS REST export operations), while the zone polygon layers should
be used when performing a query (e.g. WMS GetFeatureInfo or ArcGIS REST query
or identify operations).</b>
</p>
<p>
The colors used to identify the different watches, advisories, warnings, and
statements are the same colors used by the NWS on their map at
<a href="http://www.weather.gov" target="_blank">http://www.weather.gov</a>.
The NWS products for long-duration hazardous conditions are updated in the
nowCOAST™ map service approximately every 10 minutes.
For more detailed information about layer update frequency and timing, please reference the <a href="//nowcoast.noaa.gov/help/#!section=updateschedule" target="_blank">nowCOAST™ Dataset Update Schedule</a>.
</p> <h4>Background Information</h4>
<p>
NWS watches depict the geographic areas where the risk of hazardous weather or
hydrologic events has increased significantly, but their occurrence, location,
and/or timing is still uncertain. A warning depicts where a hazardous weather
or hydrologic event is occurring, is imminent, or has a very high probability
of occurring. A warning is used for conditions posing a threat to life or
property. Advisories indicate where special weather conditions are occurring,
imminent, or have a very high probability of occurring but are less serious
than a warning. They are for events that may cause significant inconvenience,
and if caution is not exercised, could lead to situations that may threaten
life and/or property. Statements usually contain updated information on a
warning and are used to let the public know when a warning is no longer in
effect. NWS issues over 75 different types of watches, warnings, and advisories
(WWAs). WWAs are issued by the NWS regional Weather Forecast Offices (WFOs) and
also the NWS Ocean Prediction Center, National Hurricane Center, Central
Pacific Hurricane Center, and Storm Prediction Center.
</p>
<p>
The NWS WWAs are organized on the nowCOAST™ map viewer and within this
map service by hazardous condition/threat layer groups and then by the
geographic area (i.e. coastal & inland, immediate coast or maritime) for
which the WWA product is targeted. This was done to allow users to select WWAs
for hazardous conditions that are important to their operations or activities.
</p>
<p>
Please note that the Tropical Storm and Hurricane Warnings are provided in both
the High Wind Hazards: Maritime Areas and Coastal & Inland Areas layer
groups and the Flooding Hazards: Coastal Areas layer group. These warnings are
included in the Flooding Hazards/Coastal Areas layer group because the NWS uses
those warnings to inform the public that tropical storm or hurricane winds may
be accompanied by significant coastal flooding but below the thresholds
required for the issuance of a storm surge warning. In addition, a tropical
storm or hurricane warning may remain in effect when dangerously high water or
a combination of dangerously high water and waves continue, even though the
winds may be less than hurricane or tropical storm force. The NWS does not
issue a Coastal Flood Warning or Advisory when a tropical storm or hurricane
warning is in effect; however that does not mean that there is not a
significant coastal flooding threat.
</p>
<ul>
<li>
High Wind Hazards (Associated with Non-Tropical & Tropical Cyclones)
<ul>
<li>
Maritime Areas
<ul>
<li>Brisk Wind Advisory</li>
<li>Small Craft Advisory</li>
<li>Small Craft Advisory for Winds</li>
<li>Gale Watch</li>
<li>Gale Warning</li>
<li>Storm Watch</li>
<li>Storm Warning</li>
<li>Hurricane Force Wind Watch</li>
<li>Hurricane Force Wind Warning</li>
<li>Tropical Storm Watch</li>
<li>Tropical Storm Warning</li>
<li>Hurricane Watch</li>
<li>Hurricane Warning</li>
</ul>
</li>
<li>
Coastal & Inland Areas
<ul>
<li>High Wind Watch</li>
<li>Wind Advisory</li>
<li>Lake Wind Advisory</li>
<li>High Wind Warning</li>
<li>Tropical Storm Watch</li>
<li>Tropical Storm Warning</li>
<li>Hurricane Watch</li>
<li>Hurricane Warning</li>
</ul>
</li>
</ul>
</li>
<li>
Hazardous Seas, Surf, and Beach Conditions
<ul>
<li>
Maritime Areas
<ul>
<li>Small Craft Advisory for Hazardous Seas</li>
<li>Small Craft Advisory for Rough Bar</li>
<li>Hazardous Seas Watch</li>
<li>Hazardous Seas Warning</li>
</ul>
</li>
<li>
Immediate Coast
<ul>
<li>Beach Hazards Statement</li>
<li>High Surf Advisory</li>
<li>High Surf Warning </li>
<li>Low Water Advisory</li>
<li>Rip Current Statement</li>
</ul>
</li>
</ul>
</li>
<li>
Flooding Hazards
<ul>
<li>
Coastal Areas
<ul>
<li>Coastal Flood Statement</li>
<li>Coastal Flood Watch</li>
<li>Coastal Flood Advisory</li>
<li>Coastal Flood Warning</li>
<li>Lakeshore Flood Watch</li>
<li>Lakeshore Flood Advisory</li>
<li>Lakeshore Flood Warning</li>
<li>Lakeshore Flood Statement</li>
<li>Storm Surge Watch</li>
<li>Storm Surge Warning</li>
<li>Tsunami Watch</li>
<li>Tsunami Warning</li>
<li>Tropical Storm Warning</li>
<li>Hurricane Warning</li>
</ul>
</li>
<li>
Inland Areas
<ul>
<li>Flood Watch (Point) (also called River Flood Watch)</li>
<li>Flood Watch (Areal)</li>
<li>Flood Advisory (Point) (also called River Flood Advisory)</li>
<li>Flood Advisory (Areal)</li>
<li>Flood Warning (Point) (also called River Flood Warning)</li>
<li>Flood Warning (Areal)</li>
<li>Hydrologic Outlook</li>
<li>Hydrologic Statement</li>
</ul>
</li>
</ul>
</li>
<li>
Reduced Visibility Hazards
<ul>
<li>
Maritime Areas
<ul>
<li>Dense Fog Advisory</li>
</ul>
</li>
<li>
Coastal & Inland Areas
<ul>
<li>Ashfall Advisory</li>
<li>Ashfall Warning</li>
<li>Blowing Dust Advisory</li>
<li>Blowing Dust Warning</li>
<li>Dense Fog Advisory</li>
<li>Dense Smoke Advisory</li>
</ul>
</li>
</ul>
</li>
<li>
Freezing Spray Hazards
<ul>
<li>Maritime Areas
<ul>
<li>Heavy Freezing Spray Watch</li>
<li>Freezing Spray Advisory</li>
<li>Heavy Freezing Spray Advisory</li>
</ul>
</li>
</ul>
</li>
<li>
Snow, Sleet, Freezing Rain, and Freezing Fog Hazards
<ul>
<li>
Coastal & Inland Areas
<ul>
<li>Blizzard Watch</li>
<li>Blizzard Warning</li>
<li>Freezing Fog Advisory</li>
<li>Freezing Rain Advisory</li>
<li>Ice Storm Warning</li>
<li>Lake-Effect Snow Watch</li>
<li>Lake-Effect Snow Advisory</li>
<li>Lake-Effect Snow Warning</li>
<li>Winter Storm Watch</li>
<li>Winter Weather Advisory</li>
<li>Winter Storm Warning</li>
</ul>
</li>
</ul>
</li>
<li>
Cold and Heat Hazards
<ul>
<li>
Coastal & Inland Areas
<ul>
<li>Excessive Cold Watch</li>
<li>Excessive Cold Warning</li>
<li>Excessive Heat Watch</li>
<li>Heat Advisory</li>
<li>Excessive Heat Warning</li>
<li>Frost Advisory</li>
<li>Freeze Watch</li>
<li>Freeze Warning</li>
<li>Wind Chill Advisory</li>
<li>Wind Chill Warning</li>
</ul>
</li>
</ul>
</li>
<li>
Critical Wildfire Conditions
<ul>
<li>
Coastal & Inland Areas
<ul>
<li>Fire Weather Watch</li>
<li>Red Flag Warning</li>
</ul>
</li>
</ul>
</li>
<li>
Unhealthy Air Quality
<ul>
<li>
Coastal & Inland Areas
<ul>
<li>Air Stagnation Advisory</li>
<li>Air Quality Alerts from states are NOT available</li>
</ul>
</li>
</ul>
</li>
</ul>
<p>
For descriptions of individual NWS watches, warnings, and advisories please see
Section 2 of the NWS Reference Guide available at
<a href="http://www.nws.noaa.gov/om/guide/Section2.pdf" target="_blank">http://www.nws.noaa.gov/om/guide/Section2.pdf</a>.
</p>
<h4>Time Information</h4>
<p>
This map service is time-enabled, meaning that each individual layer contains
time-varying data and can be utilized by clients capable of making map requests
that include a time component.
</p>
<p>
In addition to ArcGIS Server REST access, time-enabled OGC WMS 1.3.0 access is
also provided by this service.
</p>
<p>
This particular service can be queried with or without the use of a time
component. If the time parameter is specified in a request, the data or imagery
most relevant to the provided time value, if any, will be returned. If the time
parameter is not specified in a request, the latest data or imagery valid for
the present system time will be returned to the client. If the time parameter
is not specified and no data or imagery is available for the present time, no
data will be returned.
</p>
<p>
This service is configured with time coverage support, meaning that the service
will always return the most relevant available data, if any, to the specified
time value. For example, if the service contains data valid today at 12:00 and
12:10 UTC, but a map request specifies a time value of today at 12:07 UTC, the
data valid at 12:10 UTC will be returned to the user. This behavior allows more
flexibility for users, especially when displaying multiple time-enabled layers
together despite slight differences in temporal resolution or update frequency.
</p>
<p>
When interacting with this time-enabled service, only a single instantaneous
time value should be specified in each request. If instead a time range is
specified in a request (i.e. separate start time and end time values are
given), the data returned may be different than what was intended.
</p>
<p>
Care must be taken to ensure the time value specified in each request falls
within the current time coverage of the service. Because this service is
frequently updated as new data becomes available, the user must periodically
determine the service's time extent. However, due to software limitations, the
time extent of the service and map layers as advertised by ArcGIS Server does
not always provide the most up-to-date start and end times of available data.
Instead, users have three options for determining the latest time extent of the
service:
</p>
<ol>
<li>
Issue a <b>returnUpdates=true</b> request (ArcGIS REST protocol only)
for an individual layer or for the service itself, which will return
the current start and end times of available data, in epoch time format
(milliseconds since 00:00 January 1, 1970). To see an example, click on
the "Return Updates" link at the bottom of the REST Service page under
"Supported Operations". Refer to the
<a href="http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000w2000000" target="_blank">ArcGIS REST API Map Service Documentation</a>
for more information.
</li>
<li>
Issue an Identify (ArcGIS REST) or GetFeatureInfo (WMS) request against
the proper layer corresponding with the target dataset. For raster
data, this would be the "Image Footprints with Time Attributes" layer
in the same group as the target "Image" layer being displayed. For
vector (point, line, or polygon) data, the target layer can be queried
directly. In either case, the attributes returned for the matching
raster(s) or vector feature(s) will include the following:
<ul>
<li>
<b>validtime</b>: Valid timestamp.
</li>
<li>
<b>starttime</b>: Display start time.
</li>
<li>
<b>endtime</b>: Display end time.
</li>
<li>
<b>reftime</b>: Reference time (sometimes referred to as
issuance time, cycle time, or initialization time).
</li>
<li>
<b>projmins</b>: Number of minutes from reference time to valid
time.
</li>
<li>
<b>desigreftime</b>: Designated reference time; used as a
common reference time for all items when individual reference
times do not match.
</li>
<li>
<b>desigprojmins</b>: Number of minutes from designated
reference time to valid time.
</li>
</ul>
</li>
<li>
Query the nowCOAST™ LayerInfo web service, which has been created to
provide additional information about each data layer in a service,
including a list of all available "time stops" (i.e. "valid times"),
individual timestamps, or the valid time of a layer's latest available
data (i.e. "Product Time"). For more information about the LayerInfo
web service, including examples of various types of requests, refer to
the <a href="//nowcoast.noaa.gov/help/#!section=layerinfo" target="_blank">nowCOAST™ LayerInfo Help Documentation</a>
</li>
</ol>
<h4>References</h4>
<ul>
<li>NWS, 2006: NWS Instructions 10-313, WFO Severe Weather Products Specification, NWS, Silver Spring, MD.</li>
<li>NWS, 2007: NWS Instructions 10-320, Coastal/Lakeshore Hazard Services, NWS, Silver Spring, MD.</li>
<li>NWS, 2007: NWS Instructions 10-922, Weather Forecast Office Hydrologic Products Specification, NWS, Silver Spring, MD.</li>
<li>NWS, 2008: NWS Instructions 10-301, Marine and Coastal Services Abbreviations and Definitions, NWS, Silver Spring, MD.</li>
<li>NWS, 2010: NWS Instructions 10-519, WFO Air Quality Products Specification, NWS, Silver Spring, MD.</li>
<li>NWS, 2011: NWS Products and Services Reference Guidebook, NWS/Office of Climate, Water, and Weather Services, Silver Spring, MD.</li>
<li>NWS, 2012: NWS Policy Directive 10-3, Marine and Coastal Weather Services, NWS, Silver Spring, MD.</li>
<li>NWS, 2012: NWS Instructions 10-701, Tsunami Warning Center Operations, NWS, Silver Spring, MD.</li>
<li>NWS, 2013: NWS Instructions 10-601, Tropical Cyclone Products, NWS, Silver Spring, MD.</li>
<li>NWS, 2012: NWS Instructions 10-701, Tsunami Warning Center Operations, NWS, Silver Spring, MD.</li>
</ul>
<p>
NWS Instructions and other directives are available at <a href="http://www.nws.noaa.gov/directives/" target="_blank">http://www.nws.noaa.gov/directives/</a>.
</p>
</div>
watches
warnings
advisories
statements
long-duration
hazardous weather
hazards
marine weather
winter weather
damaging winds
high winds
rip currents
beach hazards
floods
extreme cold
extreme heat
frost
freeze
high surf
marine weather
tropical cyclones
hurricanes
lake-effect
dense fog
blowing dust
red flag
wildfires
forest fires
air quality
air stagnation
freezing spray
inland flooding
coastal flooding
inundation
ashfall
blizzard
winter storm
tsunami
lakeshore
freezing rain
freezing fog
ice storm
winter storm
coastal
maritime
inland
This nowCOAST map service provides maps of NWS watches, advisories, warnings, and statements for long-duration hazardous conditions.
NOAA/NOS/OCS nowCOAST and NOAA/NWS/CRH
For public use
NOAA/NWS Watches, Advisories, Warnings, and Statements for Long-Duration Hazards Affecting Inland, Coastal, and Maritime Areas (Time Enabled)
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