National Weather Summary for Wednesday August 12
NATIONAL WEATHER SUMMARY:
Across the East, a warm and humid air mass combined with a slow moving frontal system to trigger thunderstorms for about every state east of the Mississippi River. Thunderstorms were most common from the Ohio Valley region through the Central Gulf coast states. Heavy rain fell over portions of Mississippi and Alabama with over 2 inches of rain in areas. Severe storms were scattered throughout the region but were mostly confined to the Carolinas as storms produced strong wind gusts during the afternoon hours leading to multiple reports of felled trees. Hot and humid weather ruled the
Southeast once again with most areas getting well into the 90s for
highs. A record high temperature was set for the second day in a
row at Washington Dulles DC at 97 and a few other sites from the
Carolinas to northern Florida tied record highs.
In the Central United States, high pressure was building in from the Upper Mississippi Valley and this kept shower and thunderstorm activity primarily across the southern third of the region. Early day thunderstorms across the Ark latex region quickly diminished
but scattered clusters developed across portions of west and
southwest Texas during the afternoon with a couple storms becoming
briefly severe. Most of Texas continued to bake with highs into the
100s over much of southern Texas. McAllen, Texas broke a record
high when the mercury soared to 105. Above normal temperatures were common over most of the region with highs into the middle 90s all
the way north into North Dakota.
In the West, showers continued to provide relief from the recent dry spell across northwest Oregon and western Washington with an additional quarter to half inch of rain common on Tuesday. A few scattered thunderstorms formed during the afternoon hours across
central Colorado and south across much of New Mexico but the
remainder of the western states were dry through the day. It
continued to be cool over the Intermountain West region with new
record lows established in Rawlings, WY (39), Cedar City, UT (48)
and Grantsville, UT (54). Meanwhile, interior areas of California
saw more hot weather with 100 degree highs common across the
deserts and central Valley.
WEATHER EXTREMES FOR YESTERDAY:
HIGHEST TEMPERATURE (DEGREES F)............117 Death Valley, CA
HIGHEST HEAT INDEX (DEGREES F).............117 Death Valley, CA
LOWEST TEMPERATURE (DEGREES F)..............33 Pahaska, WY
............................................ Boulder, WY
LOWEST WIND CHILL (DEGREES F)...............32 Aspen, CO
HIGHEST WIND GUST (MPH).....................48 Anniston, AL
HIGHEST PRECIPITATION (INCHES)............3.19 Tupelo, MS
ON THIS DATE IN HISTORY:
In 1936, Seymour, Texas reaches a high of 120 degrees to set a new state record high.
In 1987, thunderstorms across northern Arizona dropped 3.90 inches of rain in 90 minutes at Walnut National Monument along with 3 inches of pea size hail. Flagstaff, Arizona received 3.04 inches
of rain, the most ever for an August day.
In 1988, extreme heat brought record highs to 15 cities in the northeastern U.S. Youngstown, OH reached the 90s for the 26th time remarkable since this was equal to the 90 degree days during the
entire decade of the 1970s.
DTN/Meteorlogix: J Sullivan