What is the NOAA Atlas 14?
Atlas 14 is an ongoing study used to analyze historical rainfall data in order to update statistical hypothetical rainfall events in Texas. Based on historical data, Atlas 14 will assign probabilities to rainfall volumes to estimate the likelihood of a rainfall event, like a 100-year storm, occurring in any given year.
When did NOAA Atlas 14 come out?
2013
This analysis, released in 2013, incorporates precipitation data through 2011 and utilizes more data from more weather stations than previous efforts. Event storms have changed in magnitude with implications for stormwater management.
What is precipitation frequency?
A precipitation frequency estimate (PFE) is defined as the depth of precipitation at a specific location for a specific duration that has a certain probability of occurring in any given year. Depth of precipitation is typically measured in inches.
What is atlas14?
Atlas 14 is a National Weather Service study of historical rainfall. We use historical rainfall data to understand our flood risk. The historical record for the previous rainfall study ended in 1994. The Atlas 14 study shows that this amount of rainfall is now likely to occur more frequently.
How many inches of rain is a 100 year storm?
For example, assume there is a 1 in 50 chance that 6.60 inches of rain will fall in a certain area in a 24-hour period during any given year….Recurrence intervals and probabilities of occurrences.
| Recurrence interval, years | Annual exceedance probability, percent |
|---|---|
| 25 | 4 |
| 50 | 2 |
| 100 | 1 |
| 200 | 0.5 |
What does NOAA stand for?
National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration U.S. Department of Commerce.
What is Ari in rainfall?
The average or expected value of the periods between exceedances of a given rainfall total accumulated over a given duration. It is implicit in this definition that the periods between exceedances are generally random. Related: annual exceedance probability (AEP)
What is the frequency of rain?
Drizzle has a unique peak at frequencies from 13–25 kHz, for example. Rainfall produces relatively more sound between 5–15 kHz than wind. The sound of heavy rain is very, very loud compared to the sound produced by breaking waves at all frequencies.
Can a 100-year flood happen two years in a row?
The 100-year recurrence interval means that a flood of that magnitude has a one percent chance of occurring in any given year. In other words, the chances that a river will flow as high as the 100-year flood stage this year is 1 in 100.
Is NOAA A military?
You won’t recognize the insignia as a branch of the military — these officers are nonmilitary, although they play a vital role in defense. The National Oceanic and Atmospheric Administration Commissioned Officer Corps, known as the NOAA Corps, is one of just two uniformed services with no enlisted or warrant officers.
Who is the current head of NOAA?
Rick Spinrad
National Oceanic and Atmospheric Administration
| Agency overview | |
|---|---|
| Annual budget | US$6.9 billion (est. 2022) |
| Agency executive | Rick Spinrad, NOAA Administrator and Under Secretary of Commerce for Oceans and Atmosphere |
| Parent agency | US Department of Commerce show Child agencies |
| Website | NOAA.gov |
Where can I find the NOAA Atlas 14?
The Wisconsin portion of the NOAA study that produced Atlas 14 was funded by the Wisconsin Departments of Natural Resources (WDNR) and Transportation (WisDOT) and SEWRPC. The Atlas 14, volume 8, version 2.0 report can be accessed at: http://www.nws.noaa.gov/oh/hdsc/PF_documents/Atlas14_Volume8.pdf
What does seasonality graph on NOAA Atlas mean?
The seasonality graphs show the percentage of precipitation totals for a given duration that exceeded the precipitation frequency estimates for the duration and selected annual exceedance probabilities in each month for each region.
Is there a joint NRCS / sewrpc presentation on Atlas 14?
A joint NRCS/SEWRPC presentation on Atlas 14 provides summary information on the development and application of Atlas 14 precipitation frequency information.
How is rainfall frequency determined in NOAA Atlas 14?
While the NOAA Atlas 14 depth-frequency information is developed for total precipitation depths characteristic of discrete durations (e.g., five minutes, ten minutes, 15 minutes), the IDF equations developed by the SEWRPC staff enable the computation of a rainfall intensity of a given frequency for any duration from 5 minutes through 24 hours.