169
FXUS62 KRAH 071100 RRA
AFDRAH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
650 AM EDT SAT JUN 7 2025
SYNOPSIS
A SERIES OF MID AND UPPER-LEVEL DISTURBANCES WILL OVERSPREAD AND
INTERACT WITH A FRONTAL ZONE THAT WILL SETTLE INTO AND STALL OVER NC
THIS WEEKEND THROUGH EARLY TO MID NEXT WEEK.
NEAR TERM /UNTIL 6 PM THIS EVENING/
AS OF 600 AM SATURDAY...
* LEVEL 2/SLIGHT-RISK OF SEVERE STORM THIS AFTERNOON AND EVENING
* HOTTEST DAY OF THE YEAR---HEAT INDICES IN THE UPPER 90S TO LOWER
100S THIS AFTERNOON
A LOW-AMPLITUDE SHORTWAVE TROUGH WILL MOVE THROUGH THE REGION
THROUGH THE AFTERNOON, FOLLOWED QUICKLY BY ANOTHER SHORTWAVE TROUGH
OR REMNANT MCV ASSOCIATED WITH THE ONGOING MCS OVER TX/OK, WHICH IS
FORECAST TO MOVE INTO THE REGION LATE THIS EVENING AND OVERNIGHT.
SEVERE WEATHER THREAT: SCATTERED SHOWERS WILL SKIRT ACROSS THE
NORTHERN PIEDMONT AND NORTHERN COASTAL PLAIN THIS MORNING WITH
DEEPER CONVECTIVE DEVELOPMENT THIS AFTERNOON IN THE LEE OF THE NC
AND VA MOUNTAINS, OWING TO STRONG DAYTIME HEATING/DESTABLIZATION AND
THE APPROACH OF A COLD FRONT FROM THE WEST.
BOTH SHEAR AND INSTABILITY ARE FORECAST TO BE IMPROVED FROM
YESTERDAY WITH DEEP LAYER SHEAR OF 30-35 KTS AND ML CAPE VALUES
PEAKING 2000-2500 J/KG. ADDITIONALLY, FORECAST SOUNDINGS SHOW
CLASSIC INVERTED V SOUNDING PROFILES, WITH D-CAPE VALUES OF 1000-
2000 J/KG ACROSS THE AREA.
THESE INGREDIENTS WILL BE VERY CONDUCIVE FOR DAMAGING WIND GUSTS
WITH ANY ORGANIZED CONVECTION THAT DEVELOPS OR MOVES INTO THE AREA,
WITH THE GREATEST SEVERE POTENTIAL EXTENDING FROM THE CENTRAL
PIEDMONT/TRIANGLE UP INTO THE NORTHERN COASTAL PLAIN/ROANOKE RAPIDS
BETWEEN 3 TO 8 PM, PER NEURAL NETWORK/MACHINE LEARNING PROBABILITIES.
ADDITIONAL CONVECTION MAY DEVELOP OR MOVE INTO THE AREA LATE THIS
EVENING AND TONIGHT AS REMNANTS OF THE AFOREMENTIONED MCS ARRIVE
INTO THE REGION. WHILE EARLIER STORMS MAY MODULATE OR STABILIZE THE
ENVIRONMENT, SUFFICIENT INSTABILITY MAY LINGER TO SUPPORT A
SECONDARY SEVERE THREAT, ESPECIALLY IF CONVECTIVE TRENDS UPSTREAM
REMAIN ROBUST. MONITORING WILL BE NEEDED THROUGHOUT THE DAY.
HEAT ALERT:
TODAY WILL MARK THE HOTTEST DAY OF THE YEAR AND THE FIRST BOUT OF
SUMMER HEAT AND HUMIDITY. STRONG DAYTIME HEATING WILL SUPPORT HIGHS
TODAY RANGING FROM MID/UPPER 80S NORTH TO LOWER/MID 90S ACROSS
INTERIOR AND SOUTHERN PORTIONS OF THE AREA. WHEN COMBINED WITH
BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S TO LOWER 70S, HEAT INDICES-
FEEL LIKE TEMPERATURES WILL RANGE FROM THE UPPER 90S TO LOWER 100S
THIS AFTERNOON ACROSS THE TRIANGLE AND SOUTHERN AREAS. TAKE
PRECAUTIONS IF SPENDING TIME OUTDOORS---STAY HYDRATED, TAKE FREQUENT
BREAKS, AND SEEK SHADE WHENEVER POSSIBLE
WARM AND MUGGY CONDITIONS WILL PERSIST OVERNIGHT. OVERNIGHT LOWS 67-
72.
SHORT TERM /SUNDAY AND SUNDAY NIGHT/
AS OF 345 AM SATURDAY...
A CLOSED MID/UPPER LOW WILL SLOWLY DRIFT SE OVER SOUTH-CENTRAL
CANADA AND THE NORTHERN PLAINS ON SUNDAY AND SUNDAY NIGHT, WITH
BROAD LOW AMPLITUDE TROUGHING OVER THE EASTERN US. AN EMBEDDED
SHORTWAVE WILL MOVE EAST ACROSS THE OH/TN VALLEYS AND MID-ATLANTIC,
WHILE A PAIR OF SURFACE LOWS MOVE NE/E, ONE FROM IN/OH INTO THE
LOWER GREAT LAKES AND THE OTHER ACROSS THE SOUTHERN MID-ATLANTIC.
THIS WILL DRAG A WEAKENING COLD FRONT THAT REACHES CENTRAL NC ON
SUNDAY NIGHT. THE REMNANTS OF AN UPSTREAM MCS WILL MOVE THROUGH LATE
SATURDAY NIGHT OR SUNDAY MORNING, AND WHILE DIURNAL TIMING ISN'T
FAVORABLE, CAN'T RULE OUT A SEVERE THREAT WITH IT ON SUNDAY MORNING
IF SLOWER MODELS LIKE THE NAM NEST VERIFY. A SEPARATE MCV LOOKS TO
MOVE ACROSS GA/SC IN THE MORNING AND AFTERNOON, WHICH MAY ALSO
PROVIDE A FOCUS FOR CONVECTIVE DEVELOPMENT PARTICULARLY IN OUR SE
ZONES. THERE COULD BE CONSIDERABLE MID AND HIGH LEVEL CLOUDS DURING
THE DAY SUNDAY DUE TO THE AFOREMENTIONED UPPER DISTURBANCES AND SW
FLOW ALOFT BRINGING IN ABOVE-NORMAL PW VALUES. HOWEVER, THE 00Z HREF
STILL DEPICTS MODERATE TO STRONG DESTABILIZATION ON THE ORDER OF
1500-2500 J/KG OF SBCAPE, AS HIGH TEMPERATURES WILL REACH THE MID-
80S TO AROUND 90 AND DEW POINTS IN THE UPPER-60S TO LOWER-70S.
GIVEN ALL OF THE ABOVE, PLUS WEAK MID-LEVEL HEIGHT FALLS ON THE
ORDER OF 10-20 M AND OUR REGION BEING IN THE RIGHT ENTRANCE REGION
OF A JET STREAK OVER THE SOUTHERN AND CENTRAL APPALACHIANS, MORE
SHOWERS AND STORMS ARE EXPECTED IN THE AFTERNOON AND EVENING.
COVERAGE IS STILL UNCERTAIN GIVEN THE MODEST BROAD FORCING AND
DIFFERING GUIDANCE (BOTH GLOBAL AND HIGH-RES), SO DID LOWER POPS
FROM NBM TO THE HIGH CHANCE - LOW LIKELY RANGE. DEEP LAYER SHEAR
DOESN'T LOOK TERRIBLY IMPRESSIVE (25-35 KTS), BUT IT COULD STILL BE
ENOUGH FOR SOME STRONG TO SEVERE STORMS WITH DAMAGING WINDS AND
ISOLATED LARGE HAIL. THUS THE SPC HAS A SLIGHT (LEVEL 2 OF 5) RISK
FOR SEVERE STORMS ACROSS MUCH OF CENTRAL NC OUTSIDE OF THE NW
PIEDMONT WHICH IS IN A MARGINAL (LEVEL 1 OF 5). THE GREATEST TORNADO
THREAT SHOULD STAY TO OUR NORTH OVER VA NEAR THE TRACK OF THE
SURFACE LOW. RAIN CHANCES WILL COME TO AN END AND SKIES WILL CLEAR
OVERNIGHT SUNDAY NIGHT BEHIND THE COLD FRONT AND AS SHORTWAVE
RIDGING APPROACHES THE REGION. STILL, LOW TEMPERATURES WILL BE MILD
(MID-60S TO 70).
LONG TERM /MONDAY THROUGH FRIDAY/
AS OF 415 AM SATURDAY...
THE COLD FRONT OVER CENTRAL NC LOOKS TO FIZZLE OUT ON MONDAY, AND
WITH MID-LEVEL HEIGHT RISES FROM SHORTWAVE RIDGING PLUS WEAKER FLOW
ALOFT, SHOWER/STORM COVERAGE WILL DECREASE. HOWEVER, THERE REMAINS
SOME DISAGREEMENT AMONG THE MODELS ON HOW MUCH BUOYANCY AND
RESULTING CONVECTION THERE WILL BE, WITH THE GFS/ECMWF COMPLETELY
DRY AND THE NAM/CMC WETTER. FOR NOW RETAIN SLIGHT TO LOW CHANCE
POPS, HIGHEST SE WHERE THE GREATEST INSTABILITY WILL BE. THE SPC HAS
INTRODUCED A MARGINAL (LEVEL 1 OF 5) RISK OF SEVERE STORMS ACROSS
THE AREA FOR MONDAY, WITH A SLIGHT (LEVEL 2 OF 5) IN THE SW PIEDMONT
WHICH MAY EXPERIENCE THE EFFECTS OF AN MCV TRACKING FROM THE DEEP
SOUTH INTO THE SOUTHERN APPALACHIANS. THE DECREASE IN
CLOUDS/PRECIPITATION WILL HELP HIGH TEMPERATURES INCREASE A BIT
COMPARED TO SUNDAY, GENERALLY UPPER-80S TO LOWER-90S, WITH HEAT
INDICES IN THE MID-TO-UPPER-90S IN THE SOUTH AND EAST.
THE CLOSED MID/UPPER LOW WILL THEN MOVE NE FROM THE UPPER GREAT
LAKES INTO ONTARIO AND QUEBEC FROM MONDAY NIGHT INTO TUESDAY NIGHT.
THIS WILL PUSH THE PARENT TROUGH FARTHER EAST AND PUSH A STRONGER
COLD FRONT THAT MOVES THROUGH CENTRAL NC ON TUESDAY NIGHT. WHILE ANY
SEVERE THREAT SHOULD END ON MONDAY NIGHT WITH LOSS OF HEATING,
SCATTERED SHOWERS AND STORMS MAY CONTINUE AS THE MCV MOVES NE ACROSS
THE CAROLINAS, AND LOWS WILL ONLY DROP TO UPPER-60S TO LOWER-70S
WITH INCREASING CLOUD COVER. MORE SEVERE STORMS ARE POSSIBLE TUESDAY
AFTERNOON/EVENING GIVEN 25-35 KTS OF MID-LEVEL FLOW AND MODERATE
DESTABILIZATION. HOWEVER, UPPER FORCING APPEARS MODEST AS WE WILL
ACTUALLY BE EXPERIENCING MID-LEVEL HEIGHT RISES BY THIS POINT. IT
SHOULD ALSO BE NOTED THAT THE GFS AND ECMWF ARE TRENDING FARTHER
NORTH WITH THE CLOSED LOW, AND ENSEMBLES ARE TRENDING A BIT DRIER,
SO WILL HAVE TO SEE IF THIS TREND CONTINUES. THE GREATEST
PRECIPITATION CHANCES LOOK TO BE IN THE EAST. FORECAST HIGHS GO BACK
DOWN SLIGHTLY TO MID-TO-UPPER-80S, WITH FORECAST LOWS TUESDAY NIGHT
IN THE MID-60S TO 70.
THE CLOSED LOW WILL LIFT FARTHER NE IN CANADA ON WEDNESDAY AND
THURSDAY, GETTING REPLACED BY RIDGING THAT BUILDS INTO THE SOUTHEAST
US. SO SHOWER AND STORM COVERAGE WILL DECREASE, BUT STILL HAVE
SLIGHT TO LOW CHANCE POPS IN THE SOUTH AND EAST AS THE FRONTAL ZONE
MAY LINGER OVER OUR AREA. PRECIPITATION CHANCES INCREASE AGAIN ON
FRIDAY AS THE RIDGING STARTS TO FLATTEN IN RESPONSE TO THE NEXT
TROUGH MOVING ACROSS THE CENTRAL US. HIGHS IN THE MID-TO-UPPER-80S
ON WEDNESDAY WILL INCREASE TO UPPER-80S TO LOWER-90S ON THURSDAY AND
FRIDAY AS S/SW FLOW INCREASES FROM A BERMUDA HIGH EXTENDING FARTHER
WEST INTO THE SOUTHEAST US.
AVIATION /08Z SATURDAY THROUGH WEDNESDAY/
AS OF 658 AM SATURDAY...
24 TAF PERIOD: AN AREA OF LIGHT RAIN MAY MOVE THROUGH THE TRIAD
TERMINALS BETWEEN 12 TO 15Z, WITH LITTLE TO NO RESTRICTIONS.
SCATTERED AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED
TO DEVELOP DURING THE AFTERNOON, AIDED BY STRONG DAYTIME HEATING AND
DESTABLIZATION AND AN APPROACHING COLD FRONT FROM THE WEST. HREF
NEIGHBORHOOD PROBABILITIES HIGHLIGHT THE BEST CHANCES ACROSS THE
NORTHERN TERMINALS WITH TIMING AS FOLLOWS:
KINT AND KGSO: 17 TO 20Z; KRDU: 19 TO 23Z; KRWI: 22 TO 02Z
AN UPPER LEVEL DISTURBANCE/SHORTWAVE TROUGH MOVING THROUGH THE AREA
COULD BRING ADDITIONAL SCATTERED SHOWERS AND STORMS INTO THE AREA
OVERNIGHT. HOWEVER, CONFIDENCE IS TOO LOW TO INCLUDE THIS SECOND
ROUND OF IN THE TAFS AT THIS TIME. ADDITIONALLY, MODELS INDICATE
SOME IFR TO MVFR STRATUS MAY DEVELOP BETWEEN 06 TO 12Z TONIGHT
ACROSS THE NORTHERN TERMINALS AS THE FRONT MOVES INTO THE AREA.
OUTLOOK: ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS IS EXPECTED
SUNDAY AFTERNOON, PRIMARILY IMPACTING EASTERN TERMINALS. AFTER A
RELATIVE LULL ON MONDAY, BOUNDARY LAYER SATURATION FROM PRIOR
RAINFALL MAY RESULT IN AREAS OF MORNING FOG/STRATUS AT ANY TERMINAL
ON SUBSEQUENT MORNINGS.
RAH WATCHES/WARNINGS/ADVISORIES
NONE.
SYNOPSIS...MWS
NEAR TERM...CBL
SHORT TERM...DANCO
LONG TERM...DANCO
AVIATION...CBL/GREEN
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