Weather Prediction Center

National Oceanic and Atmospheric Administration

Excessive Rainfall Forecast

This web page depicts the Excessive Rainfall Outlook (ERO). In the ERO, the Weather Prediction Center (WPC) forecasts the probability that rainfall will exceed flash flood guidance (FFG) within 40 kilometers (25 miles) of a point.

Product Info | Understanding ERO Categories | ERO Climatology | Day 1 threat area | Day 2 threat area | Day 3 threat area

Map Overlays
CWAs		Counties
RFCs		FEMA Regions
States		NWS Forecast Zones
Urban Areas		ARTCC/FIR

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Day 1 Excessive Rainfall Outlook
Valid 1600Z Tue May 26 2026 Through 1200Z Wed May 27 2026
Issued: 1558Z Tue May 26 2026
Forecaster: CAMPBELL
DOC/NOAA/NWS/NCEP/WPC

Excessive Rainfall Forecaster Discussion

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Download Excessive Rainfall Outlooks in GIS Format KML: Day1\| Day2\| Day3\| Day4\| Day5 Shapefile: Day1\| Day2\| Day3\| Day4\| Day5 GeoJSON: Day1\| Day2\| Day3\| Day4\| Day5 ArcGIS REST Service: Day1\| Day2\| Day3\| Day4\| Day5

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Excessive Rainfall Outlook Day 1 Static Image

Day 1 Excessive Rainfall Outlook
Outlook	Population Impacted	Area (Sq Mi) Impacted
Slight (At Least 15%)	45,479,370	359,206
Marginal (At Least 5%)	56,473,273	565,252

Weather Prediction Center National Oceanic and Atmospheric Administration

Weather Prediction Center

National Oceanic and Atmospheric Administration