Climatology and Trends in Hourly Precipitation for the Southeast United States

Brown, Vincent M.; Keim, Barry D.; Black, Alan W.

doi:10.1175/jhm-d-19-0004.1

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Climatology and Trends in Hourly Precipitation for the Southeast United States

2019
By Brown, Vincent M. ; Keim, Barry D. ; Black, Alan W.
Source: Journal of Hydrometeorology, 20(8), 1737-1755

[PDF-2.80 MB]

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Journal Title:

Journal of Hydrometeorology
Personal Author:

Brown, Vincent M. ; Keim, Barry D. ; Black, Alan W.

Brown, Vincent M. ; Keim, Barry D. ; Black, Alan W. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

This research introduces a climatology of hourly precipitation characteristics, investigates trends in precipitation hours (PH) and hourly accumulation, and uses four different time series to determine if precipitation intensity is changing across the southeastern United States from 1960 to 2017. Results indicate hourly intensity significantly increased at 44% (22/50) of the stations, accompanied by an increase in average hourly accumulation at 40% of the sites analyzed (20/50). The average duration of precipitation events decreased at 82% (41/50) of the stations. However, the frequency of 90th percentile hourly events and events above station-specific average hourly totals did not show a broad increase similar to hourly intensity. It seems hourly events are becoming heavier on average, while the duration of the average precipitation event is decreasing. Geographically, heavy hourly events are more frequent along the Gulf Coast and decrease inland. PH significantly decreased across South Carolina, Georgia, and northern Florida, mainly due to significant decreases in winter (DJF) and spring (MAM). Decreases in PH during spring were contained to Georgia and South Carolina and were accompanied by a decrease in accumulation. Decreases in PH during winter were more widespread and did not exhibit a broad decrease in accumulation, suggesting winter precipitation across that portion of the region is becoming more intense.
Keywords:

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Atmospheric Science
Source:

Journal of Hydrometeorology, 20(8), 1737-1755
DOI:

https://doi.org/10.1175/jhm-d-19-0004.1
ISSN:

1525-755X;1525-7541;
Format:

PDF
Publisher:

American Meteorological Society
Document Type:

Journal Article
Funding:

Grant no. NA13OAR4310183 ; Grant no. NA18OAR4310301 ; Grant no. NA18OAR4310337

Grant no. NA13OAR4310183 ; Grant no. NA18OAR4310301 ; Grant no. NA18OAR4310337 Less -
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Main Document Checksum:

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urn:sha256:277e94cd7e0f3d316611a695afbff526dc1a8d7f2223df63c4ac2e93e97246dc
Download URL:

https://repository.library.noaa.gov/view/noaa/60396/noaa_60396_DS1.pdf
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Climatology and Trends in Hourly Precipitation for the Southeast United States

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