


Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC
Issued by NWS Raleigh/Durham, NC
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268 FXUS62 KRAH 060650 AFDRAH Area Forecast Discussion National Weather Service Raleigh NC 250 AM EDT Sun Jul 6 2025 .SYNOPSIS... Tropical Storm Chantal will drift slowly north northwestward across the coast of South Carolina this morning. The remnant low pressure system will then drift slowly north to northeastward across central North Carolina this afternoon through early Monday. && .NEAR TERM /TODAY AND TONIGHT/... As of 250 AM Sunday... * Flood Watch in effect for all but the northeast zones of central NC * Remnants of Chantal will bring a low-end tornado threat for the Sandhills into the Central Coastal Plain south of US-1 A Flood Watch was hoisted for all but the northeast zones of central NC. The remnants of Tropical Storm Chantal will bring widespread showers and embedded storms to most of central NC through early Mon with highs this afternoon mainly in the 80s. Chantal as of 2 am was about 85 miles southwest of Wilmington, NC, with maximum sustained winds of 50 kt (60 mph) and 1002 mb. Satellite and radar do depict the system is starting to wrap up and become more defined. The latest NHC track takes the system to the NW before moving into the central NC Sandhills and weakening as a depression as it tracks ENE into the northern Coastal Plain by Mon morning. While the model guidance has come into much better agreement with regards to Chantal`s track and QPF footprint, there is still some uncertainty. Nevertheless, there was enough confidence to go with a Flood Watch for most of the area. In discussions with WPC with respect to left/right track solutions, the anticipated QPF footprint did not change much from the day shift Sat. If anything, the system may be moving a bit faster overall. The highest QPF, based on a suite of model guidance, including the CAMs/HREF and which matches well with the ECMWF AIFS model, shows the highest totals from the Triangle westward, over the western and southern Piedmont to Sandhills region of central NC. It appears that a trough over the MO valley region to Great Lakes and over the north-central Gulf may be helping to pull Chantal further to the NW, producing a band of higher QPF on its NW side. In this region of central NC, rainfall amounts of 1 to 3 inches, locally 4+, are possible. However, as has happened so often in our area, the QPF footprint may be off by 50 to 100 miles. Also, some guidance is still indicating other alternate scenarios, such as the HRRR, which shows higher totals to the north and east of Chantal over the Coastal Plain. As such, given this potential uncertainty, we included portions of the Coastal Plain in the Flood Watch, in case minor changes to the track/QPF occur with future updates. In addition to the flash flood threat, a tornado threat will exist for the Sandhills to the central Coastal Plain, largely south and east of the Triangle. Enhanced low-level flow/shear and instability with low/mid 70s dewpoints will favor the potential for low-topped supercells over eastern NC, where the right front quadrant of Chantal will overspread. It would appear the greatest threat for any isolated tornadoes would be between mid-morning into early evening, when the system is more wrapped up, during peak heating, and prior to becoming an extratropical depression. Pockets of scattered showers and embedded storms will exist into the overnight, but should lessen after midnight as the system pulls NE. Lows will be in the low/mid 70s. && .SHORT TERM /MONDAY AND MONDAY NIGHT/... As of 250 AM Sunday... The remnants of Chantal will gradually lift NE into VA during the aftn or eve on Mon. Morning pockets of showers and clouds should give way to some partial sunshine in the aftn/eve as weak westerly flow aloft overspreads the area. That should favor a warmer and also humid day with upper 80s E to low 90s W. Even with its departure, scattered showers and storms will be possible, especially along/east of US-1 closer to the departing low. That said, I would not be surprised if there is less overall storm coverage owing to weak westerly downslope flow. There will, however, be a weak trough over the OH valley with a developing weak lee trough in western NC that could still favor isolated/scattered storms. Any storms should die out after sunset, with lows muggy in the mid 70s with possible fog and stratus. && .LONG TERM /TUESDAY THROUGH SATURDAY/... As of 245 AM Sunday... * Hot and humid on Tuesday with highs in the lower to mid 90s with a few of the typically hotter spots threatening the upper 90s. It will be humid as well with heat index values of 100 to 105 across much of the area except the Triad where it will be a touch cooler. * Largely diurnally driven convection is expected for the second half of the work week into the weekend with the greatest rain chances on Thursday and Friday. * It will be continued hot on Wednesday, likely a few degrees cooler than Tuesday. High temperatures will then cool off for Thursday and Friday with a good deal of cloud cover and rain chances. Weak ridging will become established across the Southeastern U.S. on Tuesday. With morning low level thickness values in the 1420s, high temperatures will climb into the lower to mid 90s across much of the area. A few of the hotter spots such as Maxton and Raleigh may make it into the upper 90s. The hottest ENS member has a high of 99 at RDU. Will need to monitor the need for a heat advisory with heat index values of 100 to 105 currently forecast across much of the area at this point with the potential for heat index values to be a little higher. A few afternoon and evening storms are possible on Tuesday but coverage should be much more limited than the Wednesday through Friday period. The threat of mainly afternoon and evening storms increases for Wednesday through Friday period as the westerlies drop into the Great Lakes and OH Valley on Wednesday and then push east toward the Appalachians on Friday. An associated cold front approaches on Thursday and moves into the region on Friday. These forcing mechanisms along with PW values of around 2.0 inches or greater will support an active period with above climatology PoPs. With the increased cloud cover and rain chances along with a slightly cooler airmass arriving late in this period, highs on Thursday and especially Friday will range near or slightly below average. Friday`s highs should range in the mid 80s to around 90. The pattern becomes more uncertain over the weekend as the cold front is forecast to drop into the region and then persist across the Carolinas through the weekend. Forecasting the passage and position of cold fronts in our region at longer ranges during the summer can trying, so confidence is limited in forecast details for the weekend. -Blaes && .AVIATION /06Z SUNDAY THROUGH THURSDAY/... As of 212 AM Sunday... The remnants of Tropical Storm Chantal will bring widespread showers with embedded storms across the terminals, earliest at FAY and latest at GSO/INT. Ahead of the more widespread showers/storms, an area of IFR-MVFR ceilings is favored into Sun morning with increased low-level onshore flow. The heavier bands of showers and storms is favored between the late morning and early evening hours, with the highest confidence of TSRA at FAY, RWI, and RDU, where IFR or lower restrictions are possible. These sites as well could briefly improve to VFR outside of storms. The Triad terminals (GSO/INT) should see MVFR to IFR rain, especially after 18z and through the end of the TAF period. Waves of showers and some storms may continue to the end of the TAF period. Regardless, IFR or lower ceilings are favored between 03-06z with low-level saturation from the gradual departure of Chantal. NE winds may gust at times into the teens to around 20 kt, especially at FAY. Outlook: After Chantal exits early Mon, a humid airmass will favor areas of morning stratus and fog and afternoon-evening showers/storms through most of this coming week. && .RAH WATCHES/WARNINGS/ADVISORIES... Flood Watch from 6 AM EDT this morning through late tonight for NCZ007-008-021>025-038>042-073>078-083>086-088-089. && $$ SYNOPSIS...Blaes NEAR TERM...Kren SHORT TERM...Kren LONG TERM...Blaes AVIATION...Kren/MWS