…HELENE is forecast to continue to weaken and dissipate by Monday…
…There is a Marginal Risk of excessive rainfall over parts of the
Ohio/Tennessee Valleys on Saturday and over the Central
Appalachians/Mid-Atlantic Sunday…
…There are Excessive Heat Warnings over parts of Southeastern California
and the Southwest…
HELENE is forecast to continue to weaken and dissipate by Monday. The
system will produce moderate to heavy rain over parts of the
Ohio/Tennessee Valleys. Therefore, the WPC has issued a Marginal Risk
(level 1/4) of excessive rainfall over parts of the Ohio/Tennessee Valleys
through Sunday morning. The associated heavy rain will create localized
areas of flash flooding, affecting areas that experience rapid runoff with
heavy rain.
On Sunday, the area of moderate to heavy rain will move eastward to the
Central Appalachians/Mid-Atlantic. Therefore, the WPC has issued a
Marginal Risk (level 1/4) of excessive rainfall over parts of the Central
Appalachians/Mid-Atlantic from Sunday through Monday morning. The
associated heavy rain will create localized areas of flash flooding,
affecting areas that experience rapid runoff with heavy rain. In addition,
there will be a Marginal Risk of excessive rainfall over parts of the
Florida Peninsula on Saturday and Sunday.
Meanwhile, a wave of low pressure over the Pacific Northwest will move
northeastward into West-Central Canada by Sunday while the trailing front
moves into the Northern Plains. The system is expected to produce little
precipitation along the boundary.
Moreover, an upper-level high will remain over the Four Corners Region
through Monday. High temperatures over Southeastern California and the
Southwest will range from the upper 90s to 110s, and low temperatures will
be in the upper 80s to low 90s, providing little relief from the heat
overnight. The temperatures have prompted Excessive Heat Warnings over
parts of Southeastern California and the Southwest.
Ziegenfelder
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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