Old Res Weather
Lexington, Massachusetts, USA
35°F
2/16/2025 7:17pm
- Few Clouds
-
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 358 PM EDT Mon Aug 10 2026 Valid 00Z Tue Aug 11 2026 - 00Z Thu Aug 13 2026 ...Mid-summer heat persists across much of the CONUS, with a few record highs possible across the south-central High Plains... ...Severe thunderstorm and heavy rainfall threats continue across the Midwest, Ohio Valley and central Appalachians, with a hail threat over the Northern Plains over the next couple of days... As we approach mid-August, a broad ridge of high pressure remains dominant across the southern tier states and especially over the Four Corners. This pattern will maintain widespread above-normal temperatures for much of the CONUS, with highs from the upper 90s to well into the triple digits across the south-central High Plains for the next couple of afternoons. South of the ridge axis, a tropical disturbance lifting out of the western Gulf will bring a round of showers and thunderstorms into the western Gulf Coast region through this evening, followed by recurrence of late-day showers and thunderstorms there the next couple of days. Meanwhile, monsoonal convection will become more widespread over the next couple of days across the Great Basin to much of the Four Corners states. These storms will pose a threat for heavy rainfall and flash flooding especially during the late-day hours. The heavy rain threat is forecast to be highest across southern Arizona over the next couple of days where a slight risk of flash flooding is anticipated. Farther north, drier conditions will persist from parts of the Cascades eastward to the northern High Plains, supporting continued elevated fire weather concerns. Meanwhile, a frontal boundary meandering across the north-central U.S. will keep the focus for thunderstorms and attendant heavy rainfall across the Midwest, lower Great Lakes, and Ohio Valley over the next few days. In addition, thunderstorms capable of producing severe wind gusts will be possible from parts of northern Illinois eastward into the Appalachians, possibly reaching the interior Mid-Atlantic later today and Tuesday, followed by a slightly lower threat on Wednesday. Some isolated severe gusts and hail are also possible especially across the Northern Plains toward the Midwest. This is in response to a wave of low pressure sliding eastward along the meandering front, aided by an upper-level impulse sliding eastward into the Great Lakes, bringing possibly a few inches of rain with locally higher amounts somewhere within the corridor from the Midwest to the Ohio Valley where a moderate risk of flash flooding is anticipated on Tuesday through Wednesday morning. The heavy rain threat is forecast to continue into much of Wednesday along this corridor although the severe storm chances should be less prominent. Meanwhile, cooler than normal temperatures will be experienced across the northern Plains where low temperatures into the 50s are forecast for the next couple of mornings near the Canadian border. Slightly cooler than normal highs into the lower to mid 90s are found over the western Gulf Coast region where daily showers/thunderstorms are expected. Cool than normal highs will become more prevalent across the Great Basin where monsoonal late-day showers/storms become more widespread. Summer heat soaring well into the 90s with humidity and widely scattered thunderstorms will prevail across the Southeast including the Sunshine State. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php