…Debby to begin to accelerate northeastward Thursday night from central
North Carolina into the Mid-Atlantic, into western to northern NY state
Friday and northern New England Friday night…
…Heavy rains, flash and river flooding likely along and to the northeast
of the track of Debby…
…Below average temperatures persist across the Northern to Central
Plains, Upper to Mid Mississippi Valley…
…Above average temperatures continue across the West into the South, but
with less record highs compared to previous days…
…Fire weather conditions and poor air quality continue across the
Northwest, Great Basin and Northern Rockies…
Debby continues its slow northwestward track through portions of the
Carolinas on Thursday but will begin to accelerate more to the northeast
beginning Thursday evening. Continued weakening of Debby forecast as the
storm moves farther away from the ocean. However, the heavy rain, flash
and river flooding effects will continue over the next two days as the
storm begins its northeastward acceleration. With the increased
acceleration to the northeast tonight from central North Carolina into the
Mid-Atlantic, into western to northern NY State Friday and northern New
England Friday night, the rainfall totals will likely be not as heavy as
amounts the occurred when Debby was slower moving across portions of
Florida and the Southeast. Still, with moisture values well above average
and likelihood that heavy rainfall amounts of 3-5″+ will be occurring over
areas of higher terrain, the threat of life threatening flash floods will
continue along and ahead of the track of Debby, along with the lingering
effects of the flooding that has already occurred from Florida into
Georgia and the Carolinas. Currently flash flood warnings, flood warnings
and flood watches stretch across much of South Carolina, North Carolina,
northeastward through western Virginia, eastern West Virginia, western
Maryland, central Pennsylvania, west central to northern NY State into
northern Vermont and northern New Hampshire, affecting nearly 30 million
people.
The northeast acceleration of Debby is in response to the large scale
closed low associated with a strong cold front currently stretching from
the Great Lakes, southwestward into the Central to Southern Plains. Below
average temperatures in the wake of this strong front already encompass
the Northern to Central Plains, Upper to Middle Mississippi Valley and
Great Lakes. These below average temperatures will press southward into
portions of the Southern Plains Friday and Saturday and eastward into the
Ohio Valley, eastern Great Lakes and Tennessee Valley. A few record low
maximum temperatures are possible Friday across portions of the Central
Plains into the Middle Mississippi Valley and over northern Minnesota.
Above average temperatures will continue over the next few days across
much of the West into Texas, the South and Gulf Coast. A few record highs
still possible across portions of the central to eastern Gulf Coast over
the next few days, although the number of overall record highs across the
country continue to decrease from previous days. Even with less record
high potential, the current heat is resulting in excessive heat warnings
and heat advisories across much of Texas, southern Oklahoma, eastward
along the Gulf coast, including Florida and over portions of the Pacific
Northwest. This is resulting in over 60 millions people affecting by some
form of heat warning or advisory.
In addition to the heat across portions of the Northwest and West, the dry
conditions, low relative humidities and gusty winds will keep a fire
weather threat across the Northwest, Great Basin and Northern Rockies into
this weekend. Smoke from current fires will also continue to produce poor
air quality across these regions.
Oravec
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
