Lexington Weather

Lexington, Massachusetts, USA

78°F
8/26/2026 6:20pm 
  • Lexington Conditions: Partly cloudy
  • Temperature: 78.1°F / 25.6°CColder 0.3°F than last hour.
  • Dew Point: 65.3°FIncreased 0.9°Fsince last hour.
  • Relative Humidity: 65%Increased 3.0% since last hour.
  • Wind: Calm, 10-min avg: Calm, gust: None
  • Barometer: 29.96 in Steady
  • Visibility: 10 miles
  • Rain Today: 0.00 in
  •   

National Short Range Forecast Discussion 

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
427 PM EDT Wed Aug 26 2026

Valid 00Z Thu Aug 27 2026 - 00Z Sat Aug 29 2026

...Dangerous record-breaking heat continues across the South-Central U.S.
into the Southwest this week...

...Heavy rainfall and severe thunderstorms across the Midwest, Lower
Mississippi Valley, and Great Lakes/Ohio Valley on Wednesday...

...Flash flooding threat across the Southeast and Lower Mississippi Valley
into the Northeast on Thursday...

The overall weather pattern continues to show ridging holding on across
the Southwest U.S and maintaining the extreme heat for Thursday and
Friday. Meanwhile, troughing across the Pacific Northwest will push a cold
front across the region late week into the weekend. This will drop
temperatures slightly below average into the 70s and 80s and bring chances
for showers and thunderstorms across the upper Inter-Mountain West through
Friday. Across the East, a cold front will clear the Ohio Valley today and
bring the potential for locally heavy rainfall across the I-95 corridor
tomorrow. Cooler air will filter behind the front and bring high
temperatures down to the low 80s and upper 70s and morning low
temperatures in the upper 50s to low 60s.


As mentioned above, strong upper-level ridge will remain anchored across
the Southwest through Friday, bringing daytime highs in the upper 90s to
low 100s, with isolated areas reaching between 100-115 degrees in the
Southwest. Record-breaking overnight temperatures will limit recovery from
the heat, which may result in heat-related illnesses for those without
adequate cooling and hydration. Therefore, widespread Major to Extreme
HeatRisk will continue across portions of southern Texas, New Mexico,
Arizona, and California. See the latest Key Messages linked at the bottom
of the discussion for more information.

A progressive upper-level trough will move eastward across the Midwest
into the Great Lakes toward the Northeast. Organized convection will
develop along and ahead of a frontal boundary tomorrow from Washington
D.C. northwards to the Hudson Valley. The strongest storms will have the
potential to produce isolated instances of hail, damaging winds, and
isolated tornadoes. Moreover, excessive rainfall/flash flooding is
becoming increasingly likely from Baltimore to New York City metros with a
Slight Risk (level 2/4) of excessive rainfall and local flood watches in
effect. 

Across the central Gulf Coast on Thursday, proximity to a stalled frontal
boundary and shortwave energy ejecting southwards towards the Gulf will
provide forcing for abundant thunderstorms and locally heavy rainfall from
central Louisiana towards the Florida Panhandle. A Slight Risk Excessive
Rainfall Outlook is in effect for the possibility of scattered instances
of flash flooding for mostly localized urban areas such as New Orleans and
Mobile. The threat for locally heavy rainfall will shift towards the
eastern Carolinas on Friday with a front and lee troughing across the
Piedmont promoting thunderstorm development. There remains some
uncertainty on the flash flooding extent with the higher flash flood
guidance across the coastal plain. Some gusty winds are possible as well
according to the Storm Prediction Center for the possibility of wet
microbursts, typical of summer thunderstorms.

Meanwhile, continued monsoonal moisture transport around the western
periphery of the ridge will support daily thunderstorms across the
portions of the Southwest, Great Basin, and Rockies. For the Southwest
monsoon, the combination of high moisture and instability may lead to
organized slow-moving storms, which will continue to favor isolated flash
flooding across much of the Four Corners Thursday and Friday. For the
northern and central Plains, a complex of thunderstorms or two may form
Thursday and Friday, bringing isolated instances of large hail and
accompanied locally heavy rainfall.


Oudit/Wilder


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php

Extreme Heat Key Messages available at:
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php