National Weather Service United States Department of Commerce

Heat and Monsoonal Conditions This Week

Dangerous heat will build across portions of the West through this week where new daily record highs are forecast. Monsoonal showers and thunderstorms may result in flash flooding and debris flows for portions of Southwest into the Four Corners and central Rockies through at least the midweek. Stationary frontal boundary across the South and Southeast will focus showers and thunderstorms. Read More >

Technical Paper NO. 40

Rainfall Frequency Atlas of the Eastern United States 
for Duration from 30 minutes to 24 hours and 
Return Periods from 1 to 100 years -

maps of ME and NH only



30 Minute Rainfall


1 Hour Rainfall


2 Hour Rainfall


3 Hour Rainfall

6 Hour Rainfall

12 Hour Rainfall


24 Hour Rainfall

Probable Max 6 hour rainfall (inches)
Ratio of Probable Maximum 6 Hour Rainfall to 100 Year 6 Hour Rainfall (inches)

NOAA Precipitation Frequency Data Server


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