Obstacle flow signature

From Glossary of Meteorology

obstacle flow signature

The Doppler velocity signature of middle-altitude flow around the strong updraft region of a severe thunderstorm. The signature indicates stronger flow around the edges of the updraft region and weaker (or reversed) flow in the wake region immediately downwind.

Though present for all radar viewing directions, it is most pronounced when a significant component of storm motion is toward or away from the radar.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.