Three distinct 500mb geopotential height patterns that can produce flash flooding were identified from these 22 days, FCH, GBH and UL. Upper air observations were collected for each of the 22 days and analyzed to determine what parameters can …
A data-driven analysis of flash flood hazard, fatalities, and damages ...
Nov 1, 2019 · The monthly patterns of Fig. 4 are in consensus with previous analyses of flash floods and mesoscale convective systems (Maddox et al., 1979, Schumacher and Johnson, 2006). Download: Download high-res image (515KB)
Synoptic-Scale Pattern Recognition - National Weather Service
Synoptic-Scale Pattern Recognition. Synoptic-Scale Pattern Recognition. Drag up for fullscreen.
Heavy Rainfall and Flash Flooding | Oxford Research Encyclopedia …
Synoptic and Mesoscale Environments of Extreme Rain Events. Maddox et al. (1979) summarized the synoptic and mesoscale conditions associated with extreme rainfall and flash flooding in the United States and categorized them into four types: “synoptic,” “frontal,” “mesohigh,” and “western.”.
Flash flooding is more likely from future rain if the soil is nearly saturated and/or streams are running high from recent rain; however, intense rainfall on initially very dry, hard soil can cause runoff until soil wetness increases
The pattern reflects the locations of the primary and secondary short waves as they moved through northwest Montana and northeast Wyoming, respectively. Western Region forecasters did a very good job with a potentially surprising situation.
Synoptic and Meso- α Scale Aspects of Flash Flood Events
These analyses indicated that three basic meteorological patterns were associated with flash flooding in the central and eastern United States. Heavy convective precipitation episodes that occurred in the West were considered as a separate category event.
In the investigation, three patterns were identified as favorable setups for central and eastern U.S. flash flood scenarios. Under the Synoptic flash flood scenario, the upper-level atmosphere was often characterized by a highly-amplified longwave trough to …
Overview of atmospheric causes of floods. Issues related to overlapping scales. Implications. Concluding remarks. urban flash flooding; small basin floods in U.S. Basin-wide and regional flooding in AZ, LA, and Mississippi RB. Largest US rainfall-runoff floods.
The large variability of associated meteorological patterns and parameters (especially winds aloft) makes identification of necessary conditions for flash flood-producing rainfall quite difficult; however, a number of features were common to many …