The main weather story across the nation remained the hot temperatures
across the East and Midwest. A broad ridge of high pressure continued to
build over the Eastern states and maintained warm and humid conditions
from the Midwest, Ohio River Valley, and Northeast on Thursday. This
kept heat index values near 100 degrees or greater for the region. Thus,
heat advisories have been issued for most areas. Heat index values
ranged from 103 to 109 degrees for the Midwest, with some parts of the
East seeing heat index values over 110 degrees. Baltimore, Maryland saw a
mid-day high heat index value up to 115 degrees, with a high
temperature at 95 degrees.
Elsewhere, a frontal boundary over the Great Lakes produced scattered
showers and thunderstorms across the Upper Midwest on Thursday
afternoon. This increased chances of severe thunderstorm development,
with a moderate risk issued for northern Minnesota and northern
Wisconsin for the afternoon and evening hours. These storms were
expected to produce large hail, strong winds, periods of heavy rainfall,
and possibly a few tornadoes.
In the West, a low pressure system over the Southwest continues pushing
monsoonal moisture northward across the Desert Southwest. This produced
shower and thunderstorm activity that reached from Arizona and New
Mexico, into Utah, Colorado, and Wyoming.
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