…Episodes of severe thunderstorms and heavy rainfall on tap for portions
of the central and southern High Plains, the Tennessee and Ohio Valleys,
southern New England, and into the Southeast Saturday and Sunday…
…Below normal temperatures in store from the Rockies into the Great
Lakes while heat builds across the Southern U.S. and the Pacific Northwest
through Saturday…
A slow-moving, wavy frontal system stretching from the Northeast to the
Ohio/Tennessee Valleys to the central/southern Plains will be the focus
for several rounds of severe thunderstorms and drenching downpours into
the weekend. Severe thunderstorms capable of producing very large hail,
damaging winds, and a few tornadoes will be possible across a wide swath
from the Plains to the southern Mid-Atlantic. The Storm Prediction has a
targeted Enhanced Risk across Alabama and Mississippi for Saturday with
clusters of organized storms likely. A broader Slight Risk extends around
the mid-South. The severe weather threat is similar on Sunday with a
targeted Enhanced Risk (level 3/5) across the southern Plains and a Slight
Risk across the Carolinas. The Plains will have a threat for large hail
and strong winds, while the Carolinas and southern U.S. will also see a
strong wind threat and some hail threat with storms that develop along a
cold front. An isolated tornado cannot be ruled out. In addition to the
severe weather threat, these same regions will also have to contend with
bouts of heavy rainfall, some of which could lead to scattered instances
of flash flooding. For tomorrow, A Slight Risk for Excessive Rainfall is
forecast for a large portion of the Middle South with a more isolated risk
across the Tennessee and Ohio Valleys. On Sunday, the greatest threat for
flash flooding will shift westward to the southern Plains and Oklahoma as
more storm complexes likely sweep through the area once more. The
Northeast will also see some potential for isolated flash flooding on
Saturday and across the Mid-Atlantic and Appalachians on Sunday as storms
fire on a slow moving frontal boundary.
In the wake of the front, high pressure building in from the northwest
will lead to a period of cooler than normal temperatures from parts of the
northern Plains eastward to the Great Lakes. Temperatures will be around
5-10 degrees cooler than average for early June as highs reach the 70s and
low 80s. A stronger cold front will sweep across the northern Plains and
Great Lakes on Sunday and drop high temperatures into the 60s. Meanwhile,
Texas, the central Gulf Coast, and the West will heat up. Temperatures out
West will be as much as 15-25 degrees above normal. This will translate to
highs well into the 90s for many. Some temperatures could reach the
100-103 degree threshold for the interior Northwest. The Desert Southwest
will have highs in the 100-110 range across the valleys. For the western
and central Gulf Coast, high temperatures will creep up into the middle to
upper 90s, but the humidity will make the Heat Risk approach the Major to
Extreme Risk likely into Monday.
Wilder
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
