Lexington Weather

Lexington, Massachusetts, USA

71°F
8/28/2026 2:06am 
  • Lexington Conditions: Clear
  • Temperature: 70.5°F / 21.4°CColder 0.4°F than last hour.
  • Dew Point: 67.8°FIncreased 0.3°Fsince last hour.
  • Relative Humidity: 91%Increased 2.0% since last hour.
  • Wind: Calm, 10-min avg: Calm, gust: None
  • Barometer: 29.92 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
417 PM EDT Thu Aug 27 2026

Valid 00Z Fri Aug 28 2026 - 00Z Sun Aug 30 2026

...The Southeast, Northern Plains, and the Southwest will chances for
showers and thunderstorms for Friday into the weekend, some of which could
be marginally severe or bring locally heavy rainfall...

...Southwest heat will abate, while the heat shifts back to the Central
Plains by the end of the weekend...

...A cool down will occur for the West as an upper-trough moves through
the region...

The weather pattern across the U.S. will continue to favor storms across
the Southeast for the weekend as a stationary boundary lingers across the
region. Additionally, a mid-level and surface low is forecast to form from
a shortwave across the central Gulf Coast for the weekend and enhance
showers and thunderstorms. Across the West, an upper-trough will bring a
couple of surface fronts through the Pacific Northwest and Inter-Mountain
West before slowing down over the area. This will promote showers and
thunderstorms over the next few days. The strong mid-upper level ridge
across the Southwest will shift to the southern Plains for the weekend.
This will bring temperatures down closer to average for southern
California, Arizona, and southern Nevada, while warmer than average
temperatures with highs in the low 100s are possible across the South and
Central Plains.

A Slight Risk Excessive Rainfall Outlook is in place for Friday across the
Carolinas and the Virginia Tidewater as instability and moisture pools
along a stalled frontal boundary in the region. Thunderstorms capable of
hourly rainfall rates of 1-2 inches a hour could result in instances of
scattered flash flooding. Elsewhere, a Marginal Risk extends from the Gulf
Coast to the Northeast for a more marginal threat of flash flooding as the
front hangs up along the east coast. For Saturday, the stationary front
will continue to reside over the Southeast and interact with a weak
mid-level low to enhance showers and storms capable of locally heavy rain
and an isolated flash flood risk typical of summertime thuderstorms. A
Marginal Risk of Excessive Rainfall is in effect for Friday and Saturday
across the Northern Plains as shortwave troughs interact with instability
and marginal surface moisture to produce complexes of storms. The quick
motion of the storms should keep any flash flood threat marginal. Out to
the West, monsoon moisture across the Four Corners region and a broader
upper-level trough for the Rockies will bring a Marginal Risk for
Excessive Rainfall on Friday and Saturday Arizona to southern Montana.

In terms of severe weather, scattered strong winds are possible for the
Southeast tomorrow from wet microbursts, typical of summer pulse
thunderstorms. Across the Dakotas, the upper-level trough moving into the
area will bring dynamics supporting supercell wind profiles and bring
risks of large hail and damaging winds if storms form into linear
segments. On Saturday, a Marginal outlook is in effect from the Great
Basin to the Dakotas with strong to severe wind gusts possible.



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