..Hurricane Debby is expected to cause potentially catastrophic Flash and
Urban Flooding, life-threatening storm surge, and strong winds across
portions of Florida and the Southeast…
…There’s potential for Excessive Rainfall and Severe Thunderstorms
across portions of the Upper Midwest, Lower Great Lakes and Northeast
through Tuesday…
…There are Excessive Heat Warnings over parts of Central/Southeastern
California and the Southwest and Heat Advisories over parts of the Lower
Mississippi Valley…
Hurricane Debby will make landfall this morning over Florida’s Big Bend
region, where Hurricane Warnings are in effect. Life-threatening storm
surge is possible along portions of Florida’s Gulf Coast, where Storm
Surge Warnings are in effect. Widespread thunderstorms are likely to
continue across Florida and spread into Georgia and the Southeast Coast
today. The Storm Prediction Center issued a Slight Risk of Severe
Thunderstorms (level 2/5) for portions of northern Florida through
southern/coastal Georgia and into South Carolina’s central coast, where
the chance for tornadoes is greatest. Elsewhere, Tropical Storm conditions
are are expected along Florida’s west coast including the Tampa Bay area
today.
Potentially historic heavy rainfall, associated with Hurricane Debby,
across southeast Georgia and South Carolina through Friday morning will
likely result in areas of catastrophic flooding. Heavy rainfall will
likely result in considerable flooding impacts from portions of central
and northern Florida through the Coastal Plains of the Carolinas through
Friday. There are High Risks (at least 70%) of Excessive Rainfall
stretching from Florida’s Big Bend region up through coastal Georgia and
into South Carolina’s southern coast today followed by another on Tuesday
along the Georgia–South Carolina Coastline. Anywhere between 7-15 inches
of rain, with locally higher amounts, are possible from north-central
Florida to South Carolina’s northern coast over the next 48 hours. For
more information go to hurricanes.gov.
A slow moving cold front extending from the Northern High Plains to the
Northeast will be the focus for scattered showers and thunderstorms across
the northern tier states down to the Midwest and Mid-Atlantic over the
next couple of days. Today, showers and thunderstorms are expected to
develop and potentially produce severe thunderstorms and Excessive
Rainfall over parts of the Upper Midwest and interior Northeast. Slight
Risks of Flash Flooding (at least 15%) and Severe Storms are in effect
over the aforementioned areas today. The threat for heavy rainfall shifts
into the New York Tri-State area on Tuesday where another Slight Risk of
Excessive Rainfall is in effect due to the potential involvement of
tropical moisture from Debby. A low pressure system is expected to develop
over the Northern High Plains of Montana on Tuesday and contribute to
supercell/severe thunderstorm activity that evening. Severe wind
gusts/hail will be the primary threats from these storms.
High temperatures will likely remain well below average across the
Northern Plains and Upper Midwest over the next several days, while
Excessive Heat Risk grows across the Central Gulf Coast/Lower Mississippi
Valley. Excessive Heat Warnings are in effect across the Desert Southwest
and portions of California’s southern/central Valley. Monsoonal storms are
likely to continue across the Southwest and Four Corners region this week
with a Slight Risk of Excessive rainfall over far south-central Arizona on
Tuesday.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php