512 FXUS62 KRAH 201719 AFDRAHArea Forecast Discussion National Weather Service Raleigh NC 119 PM EDT Sat Sep 20 2025
.SYNOPSIS... A weak backdoor cold front will move south through NC later today and tonight. High pressure will follow and extend across the Middle Atlantic Sunday and Monday, then drift offshore.
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.NEAR TERM /THROUGH TONIGHT/... As of 115 PM Saturday...
* Mostly dry backdoor cold front will reach the region this evening.
* A few isolated showers may be possible this afternoon, with the best chance in the southern Piedmont.
* Above normal temperatures continue.
Based on the 17Z observations and satellite, it appears that the backdoor cold front is located in central VA. Over the next several hours it will continue to move southward into central NC. While the frontal passage should be dry, a few isolated showers/potential thunderstorms may be possible ahead of the front, with the best chance in the southern Piedmont where instability appears to be maximized this afternoon. Currently, a few showers/storms are already starting to develop in northern SC. Tonight, behind the front, areas of fog and low stratus look to spread into the region from the northeast.
Temperatures should be up to 5 degrees above normal today. This afternoon expect maximum temperatures around the mid 80s in the north to the upper 80s in the south. Temperatures overnight look to dip into the low 60s areawide, with perhaps a few locations dipping into the upper 50s in the coolest spots.
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.SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/... As of 115 PM Saturday...
* Warm and dry day expected.
Surface high pressure will build back in on Sunday. This should allow central NC to return to a dry period, with no rain expected on Sunday. Temperatures Sunday should be slightly cooler than today, with highs expected in the low 80s in the north to the mid 80s in the south. Lows overnight should dip into the upper 50s to low 60s. Sunday night another area of low stratus and/or fog will be possible.
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.LONG TERM /MONDAY THROUGH SATURDAY/... As of 115 PM Saturday...
At the beginning of Monday, surface high pressure will be centered over Massachusetts with a ridge extending southwest into the Carolinas. A surface low will be over the Dakotas with a stationary front extending east towards the Great Lakes. At upper levels, a trough over the northern Rockies will move southeast, eventually merging with an upper low over the western Great Lakes mid-week across the Plains. The merging of the upper level features will help intensify the surface low as it slowly pushes east.
Locally, Monday and Tuesday will be dry as the surface high remains along the East Coast. As the upper low merges and moves into the central Plains, the chance for rain should expand eastward into North Carolina late Wednesday, but the better chances for rain arrive later in the week, with Friday currently being the day with the highest chances for showers.
As the surface wind changes from having a northerly component on Monday to a southerly component Tuesday and Wednesday, highs will slowly increase through the week, with widespread 80s and a few 90 degree readings on Wednesday. As more cloud cover moves in along with showers later in the week, highs will then decrease, ranging from the mid 70s to the low 80s by Saturday. Lows will generally be in the 60s.
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.AVIATION /06Z SATURDAY THROUGH WEDNESDAY/... As of 740 AM Saturday...
LIFR-IFR restrictions will linger at RWI and FAY through 13-14Z, after which time VFR conditions and light nely surface winds are expected. Otherwise, an isolated shower/storm will be possible (~15- 20% probability of occurrence) this afternoon from near AFP to MEB and FAY, and also from near HNZ to IXA and RWI. Stratus and fog will likely develop behind a backdoor cold front late tonight-Sunday morning, most likely before 12Z at RWI and RDU and around or just after 12Z at each of the other TAF sites.
Outlook: Areas of stratus and fog will be possible again late Sunday night-Monday morning. Showers/storms and flight restrictions are expected mid to late this upcoming week.
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.RAH WATCHES/WARNINGS/ADVISORIES... None.
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SYNOPSIS...MWS NEAR TERM...Helock SHORT TERM...Helock LONG TERM...Green AVIATION...MWS
NWS RAH Office Area Forecast Discussion