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Monitoring of heavy precipitation events

These images show locations where average recurrence intervals for precipitation have been exceeded. These are referred to, for example, as "100-year rainstorms", though this terminology can cause confusion, so a more accurate description is "less than a 1% probability of occurring at a given location in any given year." This is an automated search for the types of events discussed in Schumacher and Johnson (2005, 2006) and Stevenson and Schumacher (2014), using gridded precipitation analyses, as well as updated to use NOAA's Atlas 14 to define the average recurrence intervals. (In the states of Washington and Oregon, Atlas 14 has not yet been updated, so no points are shown.) Archived images from past events when the thresholds have been exceeded are shown below.

Each dataset has been regridded to a 4-km latitude-longitude grid (the same grid used by the PRISM Climate Group) prior to calculating the exceedance points. This allows for a closer "apples-to-apples" comparison between precipitation datasets. The archive of past events is actively under development; if you don't yet see images for a particular dataset/duration, check back soon! Recent data (e.g., within the current year) has not undergone quality control, so use recent maps with caution.


Select dataset: Stage IVMRMSPRISMCONUS404      Current maps  Interactive maps of past events
Select average recurrence interval: 10-year100-year1000-year
Select duration: 72-hour48-hour24-hour6-hour
Select year: 20182019202020212022202320242025

Left arrow for previous frame, right arrow for next, space to pause/play; click to open image in new tab. Each event is listed as "mmddhh_e" (2-digit month, 2-digit day, 2-digit hour for end of accumulation period, one digit for the event number on this date).

   
010112_0 010212_3 010312_1 010312_2 010412_0 010412_1 010412_2 010512_1 010612_0 010912_0 011012_0 011112_0 011112_1 011612_0 011712_0 011712_2 011712_3 020612_0 021212_0 021712_0 021712_1 022312_0 022512_0 022612_0 022812_0 030312_0 030512_0 031112_0 031212_1 031512_1 031512_3 031612_0 032212_0 032212_1 032312_0 032312_2 032412_0 032512_0 032512_1 032512_2 032612_1 032712_0 032812_0 040512_0 040712_0 040812_0 041112_0 041312_0 041412_0 041612_0 041712_0 041712_1 042012_0 042112_1 042612_1 042712_0 042712_1 042712_2 042812_0 042812_1 050112_0 050212_1 050212_2 050412_0 050512_0 050612_0 050712_0 050712_1 050712_2 050712_3 050712_4 050812_0 050812_1 050812_4 050912_0 050912_1 050912_2 051012_1 051012_2 051112_0 051112_2 051112_3 051212_0 051212_1 051212_2 051212_3 051212_4 051312_0 051312_1 051312_2 051312_3 051412_0 051412_1 051412_2 051412_3 051412_4 051412_5 051512_0 051512_1 051512_2 051612_1 051712_0 051812_1 051812_2 051912_1 051912_2 052012_0 052012_2 052012_3 052112_0 052112_2 052312_0 052412_1 052412_2 052412_4 052412_5 052512_0 052512_1 052512_2 052512_3 052612_0 052612_1 052712_0 052812_0 052912_0 053012_1 053012_2 053012_4 053112_1 053112_3 053112_4 060112_0 060112_1 060112_3 060112_4 060112_5 060212_0 060212_1 060212_2 060312_0 060312_1 060312_5 060312_6 060412_0 060412_1 060412_2 060412_4 060412_5 060412_6 060512_0 060512_4 060612_3 060712_0 060712_2 060812_0 060812_3 060812_4 060812_5 060912_1 060912_2 060912_3 061012_1 061112_0 061112_2 061212_1 061212_2 061312_1 061412_0 061412_1 061412_2 061512_0 061512_1 061512_6 061612_0 061612_4 061712_1 061712_3 061712_4 061712_5 061812_1 061812_2 061812_4 061912_1 062012_1 062012_2 062112_3 062112_4 062112_5 062112_6 062212_1 062212_2 062312_1 062312_2 062312_3 062412_1 062412_2 062512_0 062512_1 062512_2 062612_3 062712_0 062712_1 062712_2 062712_5 062712_6 062812_0 062812_4 062812_5 062912_2 062912_3 062912_4 062912_6 063012_0 063012_1 063012_3 063012_4 070112_0 070112_1 070112_2 070112_5 070212_1 070212_2 070212_5 070312_0 070312_1 070312_2 070412_2 070412_3 070412_6 070512_0 070512_1 070512_2 070512_3 070512_4 070612_0 070612_1 070612_2 070712_1 070712_2 070812_0 070812_1 070812_2 070812_4 070812_5 070812_6 070912_1 070912_2 070912_3 070912_5 071012_0 071112_0 071112_1 071212_3 071212_4 071212_6 071312_0 071312_2 071312_3 071312_4 071312_5 071412_0 071412_2 071412_3 071412_4 071412_5 071512_0 071512_2 071512_3 071512_4 071512_5 071512_6 071612_0 071612_1 071612_2 071612_4 071712_1 071712_2 071812_1 071912_2 071912_4 072012_0 072112_1 072112_2 072212_0 072212_1 072212_4 072212_5 072312_0 072412_0 072412_1 072512_1 072612_2 072612_4 072712_3 072712_4 072812_5 072912_2 072912_3 072912_4 073012_0 073012_2 073012_3 073012_4 073112_2 073112_3 073112_5 080112_1 080112_3 080112_4 080112_6 080212_2 080212_3 080312_0 080312_1 080312_2 080312_3 080412_2 080412_3 080412_4 080412_6 080512_0 080512_1 080512_2 080512_3 080512_5 080612_0 080612_1 080612_2 080612_3 080612_6 080712_0 080712_1 080712_2 080812_2 080812_3 080812_5 080912_0 080912_1 080912_3 081012_0 081012_4 081112_0 081112_1 081112_2 081212_0 081212_1 081312_0 081312_1 081312_3 081312_5 081412_1 081412_2 081412_3 081412_4 081412_6 081412_7 081612_2 081612_4 081612_5 081712_1 081712_2 081812_0 082012_0 082112_0 082112_1 082212_0 082312_0 082312_3 082412_0 082412_1 082512_0 082512_2 082512_3 082612_0 082712_0 082712_1 082812_0 082812_1 082812_2 082812_3 082812_6 082912_0 082912_1 082912_2 083012_0 083012_1 083012_3 083112_0 083112_1 083112_2 090112_0 090212_0 090312_0 090312_1 090312_2 090412_1 090512_0 090612_0 090612_1 090612_2 090712_1 090912_0 090912_1 090912_2 091012_1 091012_2 091112_0 091112_1 091112_2 091212_0 091212_1 091212_2 091312_0 091312_2 091412_0 091412_1 091512_0 091512_1 091512_2 091512_5 091612_0 091712_2 091812_1 091912_2 092012_2 092112_0 092112_2 092112_3 092212_1 092212_3 092312_0 092312_1 092312_2 092312_3 092312_4 092412_0 092412_1 092412_2 092412_3 092512_1 092512_2 092512_3 092612_1 092712_0 092712_1 092812_1 092812_2 093012_0 093012_1 100112_0 100212_0 100212_1 100212_2 100212_3 100312_0 100312_2 100412_1 100512_0 100512_1 100612_0 100812_0 100912_0 101312_0 101412_0 101412_1 102512_1 102512_3 102612_0 102612_2 102712_1 102812_0 102912_0 103012_0 110312_1 111612_0 111712_0 111812_0 112012_0 112412_0 112812_0 112912_0 120312_0 120312_1 120412_0 120612_0 120712_0 121212_1 121512_0 121812_0 121912_1 121912_2 122112_0 122212_0 122312_0 122712_0

This material is based upon work supported by the National Science Foundation under Grant No. AGS-2337380. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.



DISCLAIMER: The images and data on this site are intended for meteorological education and research purposes and, although they should generally be up to date, are not monitored at all times. Do not use for making decisions where money or lives are at stake. For official forecasts and warnings, visit the National Weather Service.