


Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC
Issued by NWS Raleigh/Durham, NC
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --610 FXUS62 KRAH 301506 AFDRAH Area Forecast Discussion National Weather Service Raleigh NC 1106 AM EDT Mon Jun 30 2025 .SYNOPSIS...-- Changed Discussion --Sub-tropical high pressure centered south of Bermuda will extend westward across the South Atlantic states today, then gradually lose influence as a mid and upper-level trough and surface cold front settle into the Middle Atlantic and Carolinas Tuesday and Wednesday.-- End Changed Discussion --&& .NEAR TERM /THROUGH TONIGHT/...-- Changed Discussion --As of 1100 AM Monday... The previous forecast of persistence hot and humid, with isolated/ widely scattered afternoon-evening showers/storms (relative highest coverage over the Piedmont/wrn Sandhills) remains on track. A weakening mid/upr-level low over the Southeast in recent days had edged as far northeast as the nrn GA/SC border on Sunday, with associated cyclonic flow and influence extending across the wrn half of NC. However, water vapor satellite data indicate that feature has since drifted swwd to the s-cntl GA/AL border this morning, while continuing to weaken. Anticyclonic flow has consequently become established through the mid/upr-levels throughout cntl NC, which may further decrease convective coverage in cntl NC relative to Sunday. Nonetheless, the heat and humidity will contribute to another day of moderate destabilization and little to no CINH, so there will remain a 15-30 percent chance of convection, particularly where a surface trough will support weak convergence over the wrn/srn Piedmont and wrn Sandhills. .PREV DISCUSSION... /ISSUED 245 AM EDT Mon Jun 30 2025/ Yet another day of diurnally showers and thunderstorms is expected across the region. Similar to previous days, the greatest coverage is expected to be across the west compared to the east. However, high resolution models are indicating less coverage across the eastern half of the forecast area than previous days. Thunderstorms are likely to continue into the evening across the Triad, then fizzle out by midnight. Once again, highs should be in the low to mid 90s, with lows perhaps a degree or two warmer with slowly increasing high cloud cover in advance of the next system.-- End Changed Discussion --&& .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/... As of 245 AM Monday... On Tuesday morning, a cold front will extend from Lake Ontario southwest into Kentucky and continuing into Texas. Over the last couple of days, models have slowed the arrival of the front into the region. While much of the region will still have showers and thunderstorms on Tuesday, the highest rainfall totals will likely be delayed to Tuesday night. Considering the delay in the arrival of precipitation, Tuesday`s high temperatures have come up a degree or two compared to the previous forecast, but will still range from the mid 80s to the low 90s. Lows will be in the upper 60s and lower 70s. Much of the forecast area remains in a Marginal (level 1 of 5) risk for severe weather on Tuesday, which seems appropriate considering there would be modest instability, but minimal shear to organize storms. In addition, if things trend closer to the 00Z run of the HRRR, an even slower solution, more precipitation would occur overnight when instability would be further reduced. Will not wait for the new Day 2 WPC Excessive Rainfall Outlook to send out this discussion, but the Sunday afternoon ERO included much of the forecast area west of I-95 in a Marginal (level 1 of 4) risk for excessive rainfall. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... As of 300 AM Monday... * Lingering chance of storms and risk of localized flash flooding Wednesday. * Drier for the end of the week with mainly isolated afternoon storms. Showers and storms expected to be ongoing late Tues night may continue through Wed morning and then increase and intensify Wed afternoon, especially across the south and east as the effective front associated with Tue`s storms is forecast to settle through the area. The associated upper shortwave trough axis is forecast to cross the area early Wed, so there should be some downward trend across the west by early Wed evening given the implied subsidence behind the trough. The amount of instability or Wed is still uncertain since there should be a lot of cloud cover early Wed, so the main hazard may be localized flash flooding with PW around 2 inches. Another shortwave passing through New England on Thu will maintain northwesterly flow across the region Thu/Fri and will ultimately help push a reinforcing shot of relatively drier air into the area by Fri. In a drier deep layer airmass, we should see mainly isolated storms each day, primarily confined to the seabreeze or higher terrain. Mid-level ridging is expected to build across the Deep South toward the Mid-Atlantic region over the weekend, which should result in continued relatively low POPs and temps climbing back above normal into the low to mid 90s. One caveat is that aforementioned cold front is forecast across northern FL, and models have signaled a chance a low developing along the front. Models have been split on whether that low would develop over the northeast Gulf or off the Florida east coast. No local impacts are evident in current model guidance, but there could be some enhancement of POPs over the east by Sun. && .AVIATION /11Z MONDAY THROUGH FRIDAY/... As of 635 AM Monday... 24 hour TAF period: Coverage of diurnally driven showers and thunderstorms should be slightly less than the last few days, but still high enough to warrant a PROB30 group at INT/GSO where the chances for precipitation are the highest. It also appears that all terminals will have the potential for gusts around 15 kt in the afternoon, with the wind remaining slightly elevated overnight. Outlook: More widespread coverage of storms is expected Tuesday and Wednesday as a front slowly moves into the area. The highest chance for restrictions will come Tuesday night with IFR/LIFR ceilings possible. The bulk of showers/storms should have moved through by Wednesday night, although an isolated showers/storm cannot be ruled out at FAY/RWI Wednesday night and Thursday. After that, dry VFR conditions are predicted. && .RAH WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...MWS NEAR TERM...MWS/Green SHORT TERM...Green LONG TERM...BLS AVIATION...Green