1. Difference between TP-40, TP-49, and HYDRO-35 and NRCC Data

2. Publications
Technical Paper 40, minute to 24-hour for 1-year to 100-year return periods.
NWS HYDRO-35, to 60- Minute Precipitation Frequency for the Eastern and Central United States.
Technical Paper 49, Two- to Ten- Day Precipitation for Return Periods of 2 to 100 years.
TP-40 vs NRCC
October 2010

3. This picture is taken from NOAA Atlas 14 Volume 2
This picture is taken from NOAA Atlas 14 Volume 2. The areas colored in green have higher precipitation than TP-40.
TP-40 vs NRCC
October 2010

4. NRCC – TP40 10-year 24-hour, percent more or less
TP-40 vs NRCC
October 2010

5. NRCC – TP40 10-year 24-hour, percent more or less
TP-40 vs NRCC
October 2010

6. NRCC – TP40 25-year 24-hour, percent more or less
TP-40 vs NRCC
October 2010

7. NRCC – TP40 25-year 24-hour, percent more or less
TP-40 vs NRCC
October 2010

8. NRCC – TP40 100-year 24-hour, percent more or less
TP-40 vs NRCC
October 2010

9. NRCC – TP40 100-year 24-hour, percent more or less
TP-40 vs NRCC
October 2010

10. NRCC – Hydro35 10-year 60-min percent more or less
TP-40 vs NRCC
October 2010

11. NRCC – Hydro35 10-year 60-min percent more or less
TP-40 vs NRCC
October 2010

12. NRCC – Hydro35 25-year 60-min percent more or less
TP-40 vs NRCC
October 2010

13. NRCC – Hydro35 25-year 60-min percent more or less
TP-40 vs NRCC
October 2010

14. NRCC – Hydro35 100-year 60-min percent more or less
TP-40 vs NRCC
October 2010

15. NRCC – Hydro35 100-year 60-min percent more or less
TP-40 vs NRCC
October 2010

16. NRCC – TP-49 100-year 10-day percent more or less
TP-40 vs NRCC
October 2010

17. NRCC – TP-49 100-year 10-day percent more or less
TP-40 vs NRCC
October 2010

18. Summary Not all durations and return periods were compared.
NRCC data shows general increase as return period gets larger for 60-minute and 24-hour durations.
NRCC 100-year 10-day precipitation trend is lower on average.
NRCC RF Distribution
October 2010

19. NRCC RF Distribution
October 2010