Old Res Weather
Lexington, Massachusetts, USA
35°F
2/16/2025 7:17pm
- Clear
-
35.1°F / 1.7°C
-
32.4°F
- 90%
- Calm, 10-min avg: Calm, gust: None
-
- 10 miles
- 0.01 in
- $VPuv None
National Short Range Forecast Discussion
Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Fri Sep 11 2026 Valid 12Z Fri Sep 11 2026 - 12Z Sun Sep 13 2026 ...Lingering front maintains unsettled weather across the Lower Mississippi Valley, Southeast, and Mid-Atlantic... ...Northern Pacific systems usher in cool and wet weather over portions of the Northwest and Northern Tier... This evening, the weather map over the Lower 48 highlights a stationary frontal boundary extending from the Ohio Valley into the Southern Plains. While this front recently provided much-needed relief from the heat to the Nation's midsection, this feature is expected to weaken over the next two days as temperatures warm again across the South-Central and Eastern U.S. In fact, a few daily high temperature records could fall in the Southern Plains this weekend as daytime highs climb into the upper-90s and triple digits. The increasingly warm and unstable air will also interact with the front and a disturbance aloft to yield a broad area of showers and thunderstorms this weekend from the Lower Mississippi Valley through the Mid-Atlantic. Isolated to scattered heavy rainfall and flash flooding will be the main concern with this activity, particularly with any storms tomorrow near the Central Appalachians and the I-95 corridor from Philadelphia to Washington D.C. Meanwhile, the Northern Tier remains active as a pair of Pacific systems push two well defined fronts across the Western U.S. and international border this weekend. Portions of the Upper Mississippi Valley and Upper Midwest are being monitored today for scattered heavy rain and severe weather potential later this afternoon along the cold front from the lead system. With time, however, expect the focus for thunderstorms and heavy rainfall to shift southward toward the Central Plains this weekend with the arrival of the leading front. Further west, the second Pacific system is expected to pivot over the Northwest late Saturday, spreading beneficial soaking rains across the region through the Northern Rockies. Some mixed precipitation will even be possible Sunday morning in the Northern Rockies beneath the base of the second system, with high temperatures 15-20 degrees below normal expected to close out the weekend. South of this activity, monsoon thunderstorms will continue for the next several days over the Southwest, although coverage of storms could briefly wane tomorrow. Even so, the potential for isolated flash flooding will remain each day, especially over vulnerable burn scars, dry washes, or slot canyons. Asherman Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php