Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
334 AM EDT Fri Jul 19 2019
Valid 12Z Fri Jul 19 2019 - 12Z Sun Jul 21 2019
...A dangerous heat wave is building in the Central and Eastern U.S....
...There is a slight to enhanced risk of severer thunderstorms over parts
of the Upper Mississippi Valley into the Upper Great Lakes...
...There is a slight risk of excessive rainfall over parts of the Upper
Mississippi Valley into the Upper Great Lakes...
An upper-level ridge extending from parts of California eastward to the
East Coast will continue as the southern edge of the Westerlies extends
across the northern tier of the lower 48 states through Sunday. Excessive
Heat Warnings and Heat Advisories extend from parts of the Central Plains
eastward to the Northeast and southward to the Southern Mid-Atlantic. The
potential for record high temperatures will extend from parts of the
Mid-Atlantic into parts of the Ohio Valley on Saturday. In addition, the
potential for record high low temperatures will extend from parts of the
Middle Mississippi Valley into the Great Lakes/Ohio Valley and into the
Mid-Atlantic, also on Saturday. Severe thunderstorms with potential
excessive rainfall will develop along a front extending from the Upper
Great Lakes roughly westward to Northern Plains. The boundary will slowly
sage southward stretching from Northern Maine across the Lower Great Lakes
into the Middle Mississippi Valley and the Central Plains by Sunday.
Tropical moisture and weak upper-level impulses will aid in producing
showers and thunderstorms over parts of the Southern Mid-Atlantic to the
Southeast and the Southern Ohio and Tennessee Valleys a long with the
Central Gulf Coast with the greats areal coverage during the late
afternoon into the late evening on Friday into Saturday. Overnight
Saturday, showers and thunderstorms will develop over parts of the Central
and Southern High Plains.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php