Mid-Tropospheric Flow Characteristics of Intense Precipitation Events in the Southeastern USA

Skeeter, Walker; Senkbeil, Jason C.

doi:10.4018/ijagr.2020070102

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…Ref. [33] noted that July-August and September recorded at least 50 percent more extreme precipitation events than other months, which overlaps with the peak months of our research.…”

Section: Trends In 1iph Rainfall Countssupporting

confidence: 80%

Spatial and Temporal Variability of Extreme Precipitation Events in the Southeastern United States

Rahman,

Senkbeil,

Keellings

2023

Atmosphere

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Much of the Southeastern United States (SeUS) has experienced an increasing number of extreme precipitation events in recent decades. Characterizing these extreme precipitation events is critical for assessing risk from future hydroclimatic extremes and potential flash flooding. A threshold of one inch per hour (1IPH) was used to indicate an extreme precipitation event. Non-parametric tests were run to identify trends in 1IPH event frequency and locate time series change points. In the last 20 years, 1IPH events increased by 53 percent in the SeUS, and 21/61 stations recorded significant increasing trends. A change point is identified in 15/61 stations. June, July, and August are generally the peak time for 1IPH events, but Florida, Louisiana, and Mississippi recorded longer peak seasons. For the time between events, 17/61 stations recorded significant decreasing trends, implying that 1IPH events are increasing in frequency. Four teleconnection indices were positively correlated with 1IPH events. The SeUS experiences considerable tropical cyclone-induced extreme precipitation, yet only seven percent of 1IPH events overlapped with tropical cyclones. Therefore, the increasing frequency of 1IPH events is likely the result of a combination of baroclinic frontal zones or regional and mesoscale convective features. Causes for the increasing frequency of 1IPH events require further research.

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“…Ref. [33] noted that July-August and September recorded at least 50 percent more extreme precipitation events than other months, which overlaps with the peak months of our research.…”

Section: Trends In 1iph Rainfall Countssupporting

confidence: 80%

Spatial and Temporal Variability of Extreme Precipitation Events in the Southeastern United States

Rahman,

Senkbeil,

Keellings

2023

Atmosphere

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“…The precipitation varies with season in the SEUS, with the warm season having higher precipitation intensity than the cold season in the coastal areas while the opposite might be true in some inland areas [1]. It is also subject to extreme weather by way of torrential rain and floods and water deficits associated with long-persistent dry spells [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Characteristics of Warm Season Weather Types in the Southeastern United States of America

et al. 2021

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Daily weather types (WTs) over the Southeast United States have been analyzed using 850 hPa winds from reanalysis data from March to October of 1979–2019. Six WTs were obtained. WTs 1–3 represent mid-latitude synoptic systems propagating eastward. WT4 is a summer-type pattern predominantly occurring in June–August, with the center of the North Atlantic Subtropical High (NASH) along the Gulf coast in the southern United States. WT5 is most frequent from August to middle October, with the NASH pushed further north and southerly winds over the northern Great Plains. An anticyclone centered at the Carolina coast characterizes WT6, which occurs in all months but is slightly more frequent in the spring and fall, especially in October, corresponding to fair weather in the region. WTs 1, 2 and 3 can persist for only a few days. WTs 4, 5 and 6 can have long spells of persistence. Besides self-persistence, the most observed progression loop is WT1 to WT2, to WT3, and then back to WT1, corresponding to eastward-propagating waves. WTs 4 and 5 are likely to show persistence, with long periods of consecutive days. WT6 usually persists but can also transfer to WT3, i.e., a change from fair weather in the Southeast U.S. to rainy weather in the Mississippi River Valley. A diurnal cycle of precipitation is apparent for each WT, especially over coastal plains. The nocturnal precipitation in central U.S. is associated with WT3. WTs 1–3 are more frequent in El Niño years, corresponding to stronger westerly wave activities and above normal rainfall in the Southeast U.S. in the spring. The positive rainfall anomaly in the Mississippi and Ohio River valley in El Niño years is also associated with more frequent WT3.

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Mid-Tropospheric Flow Characteristics of Intense Precipitation Events in the Southeastern USA

Cited by 2 publications

References 27 publications

Spatial and Temporal Variability of Extreme Precipitation Events in the Southeastern United States

Spatial and Temporal Variability of Extreme Precipitation Events in the Southeastern United States

Precipitation Characteristics of Warm Season Weather Types in the Southeastern United States of America

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