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The CPC Weather Hazards Web Service consist of Forecasted US Weather Hazard Outlooks for 3-14 days. The Day 3-7 United States Hazards Outlook product depicts possible impending weather-related hazards during the medium range period. The hazard areas are based off of products issued from the Weather Prediction Center(WPC), the Storm Prediction Center (SPC), the Climate Prediction Center(CPC), along with medium range numerical model guidance. The intended audience forth is product includes emergency managers, weather forecasters, planners and managers in the public and private sectors, as well as the general public. The Hazards Outlook was originally a Climate Prediction Center product, but WPC assumed responsibility for the product beginning in early 2019. CPC still issue the hazards chart for the 8 to 14 day period (at:https://www.cpc.ncep.noaa.gov/products/predictions/threats/threats.php).
The forecast graphic is accompanied by a narrative discussion, which describes the meteorological features that are associated with the depicted hazards. The graphic and discussion are issued once per day and are available by 3:30pm EST/4:30pm EDT Monday through Friday only. At the current time, this product is not issued on the weekends so please note that the information on the web page over the weekend may be out of date.
Hazard Criteria Chart
Hazard | Criteria |
Heavy Rain | WPC Medium Range Marginal/Slight Risk Excessive Rainfall Outlook (ERO Days 4-5, hazards days 3-4). Internal experimental Marginal/Slight Risk Excessive Rainfall Outlook first guess (EXP Days 6-8, hazards days 5-7). Alaska: Variable thresholds based on season, geographic region, and duration |
Heavy Snow | 40% probability of Moderate snow-related Impacts based on WPC’s Experimental Probabilistic Winter Storm Severity Index Alaska: Variable thresholds based on season, geographic region, and duration |
Heavy Precipitation | Used when both heavy rain and snow criteria are met, or when there is precipitation type uncertainty but either type would meet the criteria if it were to occur. Often used for West Coast Atmospheric River events. |
Freezing Rain | 40% probability of moderate ice-related impacts based on WPC’s Experimental Probabilistic Winter Storm Severity Index |
Hazardous Heat | 40% probability of exceeding widespread NWS Heat Advisory criteria Alaska: High temperature thresholds ranging between 70-90 degrees during the Summer months |
Hazardous Cold | 40% probability of exceeding widespread upcoming NWS Cold Weather Advisory criteria |
Rapid Onset Drought | (1) Abnormal dryness(D0)in the current U.S.DroughtMonitor |
Frost/Freeze | 40% probability of low temperatures < 36 (frost) or < 32 (freeze) during transition seasons |
High Winds | 40% probability of gusts greater than 55 mph (48 knots) Alaska: Variable thresholds between 40 - 55 knots based on geographic region |
Significant Waves | Greater than 20 foot waves along coast or nearby waters |
Severe Thunderstorms | Based on Storm Prediction Center medium range severe weather outlooks of 15% or greater |
Drought | |
Flooding likely, possible, or occurring | |
Critical Wildfire Risk |
Update Frequency: Monthly - 3 PM last day of Month and Seasonal - Third Thursday of Month 8:30 Eastern
Links to graphical web page:
Day 3-7: https://www.wpc.ncep.noaa.gov/threats/threats.php
Day 8-14: https://www.cpc.ncep.noaa.gov/products/predictions/threats/threats.php
Links to data download (shapefiles):
https://www.wpc.ncep.noaa.gov/threats/final/Prcp_D3-7.zip
https://www.wpc.ncep.noaa.gov/threats/final/Temp_D3-7.zip
https://www.wpc.ncep.noaa.gov/threats/final/Soils_D3-7.zip
https://www.wpc.ncep.noaa.gov/threats/final/Wildfires_D3-7.zip
https://www.cpc.ncep.noaa.gov/products/predictions/threats/Prcp_D8-14.zip
https://www.cpc.ncep.noaa.gov/products/predictions/threats/Temp_D8-14.zip
https://www.cpc.ncep.noaa.gov/products/predictions/threats/Soils_D8-14.zip
Link to metadata
Questions/Concerns about the service, please contact the DISS GIS team.
Time Information:
This service is not time enabled