603 FXUS62 KRAH 271040 AFDRAHArea Forecast Discussion National Weather Service Raleigh NC 640 AM EDT Sat Sep 27 2025
.SYNOPSIS... A surface cold front over the Piedmont of North Carolina will drift slowly southeast over the central and eastern Carolinas today through tonight, before settling near the Carolina coast on Sunday as weak high pressure builds in from the north. Meanwhile, an upper level trough to our west today will weaken and lift northeast into the Mid Atlantic region through Sunday. A potential tropical cyclone near northeast Cuba this morning could approach the Carolina coast Monday or Tuesday.
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.NEAR TERM /TODAY THROUGH TONIGHT/... As of 235 AM Saturday...
* The risk for excessive rainfall continues in the NW Piedmont early this morning, however the greatest heavy rain threat for later today and tonight has shifted E into E NC.
Bands of moderate rain and embedded thunder continue at this hour from the S Foothills through the NW Piedmont of NC and across S VA, while lighter showers are noted over the rest of central NC southward through central/S SC. The heavier rain over W NC/S VA is near the surface frontal zone and corresponds to focused lift associated with a mid level perturbation lifting NNE on the E side of the trough and low to our W from the Ohio Valley to AL, as well as an upper div max in the RR quadrant of the upper jet. The mid level wave will lift into VA this morning while the upper jet entrance region slowly decelerates, resulting in a decreasing threat for widespread heavy rainfall over the Piedmont by later this morning. The mid level trough/low will gradually weaken as it lifts ENE into W NC today and up through the Shenandoah Valley tonight, while the corresponding surface front analyzed from the FL Panhandle through the W Piedmont across S VA drifts slowly ESE through our area into E NC. Our PW remains elevated this morning over much of the CWA, around 125%-140% of normal, however as drier air noted on WV imagery over the Gulf states and N Gulf swings ENE into W NC, we should see convection coverage and intensity decrease markedly over the W CWA. Models agree fairly well on the axis of high PW shifting into E NC this afternoon and tonight, and while there will be some overlap of stronger forcing for ascent, surface forcing along the front, and much above normal PW in our far NE today, this area has lacked substantial rainfall recently, with
NWS RAH Office Area Forecast Discussion