…Record-breaking heat forecast this weekend from parts of the Southwest
eastward into the central and south-central U.S…
…Developing storm system to bring unsettled weather to the Ohio Valley,
Great Lakes, and Northeast Saturday into Sunday…
…Locally heavy rain possible over southeast Florida through Sunday…
An expansive ridge of high pressure stretching from the Southwest to the
central and southern Plains will result in continued record-breaking heat
across portions of the Desert Southwest through this weekend. High
temperatures are forecast to reach into the upper 90s and triple digits,
which is well above normal for this time of year. Meanwhile, anomalous
late season heat will also expand farther east into the central and
south-central U.S. on Saturday with highs ranging from the upper 80s to
upper 90s. Numerous daily record high temperatures are possible. By
Sunday, a cold front will squash the most searing heat southward, bringing
some quick relief to the Central U.S. South of the front, yet another day
of record heat is likely from Arizona eastward through central Texas into
the Lower Mississippi Valley where highs will once again soar well into
the 90s to near 100. Elsewhere, unseasonable warmth presses eastward into
the Ohio Valley, Mid-Atlantic, and Southeast Saturday into Sunday, with
the only cooler than normal spots largely confined to the northern Plains,
Great Lakes, and Northeast.
The aforementioned cold front is forecast to march eastward across the
Great Lakes and Northeast tonight into Saturday before stalling over the
Ohio Valley and Mid-Atlantic on Sunday. An area of low pressure is
expected to develop along the front over Indiana and Ohio, strengthening
as it moves eastward into Pennsylvania by Sunday night. This storm system
will bring scattered to widespread showers and thunderstorms to the larger
region on Sunday, which may dampen outdoor activities at times. A few
isolated strong to severe thunderstorms are possible too, especially along
the front from eastern Kentucky to West Virginia. In fact, the Storm
Prediction Center has issued a Marginal Risk (level 1 of 5) to highlight
this risk on Sunday.
Following in the wake of Hurricane Milton, strong northeasterly flow aided
by high pressure over the southern Appalachians and northeast of the
Bahamas will keep the threat of coastal hazards and locally heavy rain in
the forecast along the Atlantic Coast of Florida. In particular, showers
and thunderstorms along the southeast Florida coastline may remain
somewhat stationary due to weak flow aloft, while also containing intense
rainfall rates. As a result, a Marginal Risk (level 1/4) of Excessive
Rainfall remains in place for this area on Saturday and Sunday in order to
bring continued awareness to the threat of localized flash flooding.
Miller/Snell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
