101
FXUS62 KRAH 050609
AFDRAH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
110 AM EST WED FEB 5 2026
WHAT HAS CHANGED
AS OF 1115 PM WEDNESDAY...
* THE WINTER WEATHER ADVISORY CONTINUES. THERE IS LIGHT SNOW AND
SLEET IN THE NORTHERN COUNTIES. IT HAS BEEN ADDED BACK TO THE
FORECAST. VERY LIGHT ACCUMULATIONS EXPECTED - ALONG WITH SOME
FREEZING DRIZZLE OVERNIGHT.
* INCREASING CONFIDENCE FOR STRONG WINDS ON SATURDAY.
KEY MESSAGES
AS OF 1115 PM PM WEDNESDAY...
WINTER WEATHER ADVISORY STARTED AT 6 PM AND IS IN EFFECT THROUGH 10
AM THURSDAY.
1) RAIN THIS EVENING WILL TRANSITION TO PATCHY LIGHT SNOW/SLEET WEST
AND NORTH AND PATCHY DRIZZLE AND FREEZING DRIZZLE SOUTH AND EAST.
AND FREEZING DRIZZLE OVERNIGHT BEFORE COMING TO AN END THURSDAY
MORNING. MINOR IMPACTS ARE EXPECTED.
2) LIGHT RAIN MAY MIX WITH SNOW/SLEET FRIDAY EVENING, NO
ACCUMULATIONS ARE EXPECTED.
3) STRONG WINDS SHOULD BE EXPECTED ON SATURDAY BEHIND A COLD FRONTAL
PASSAGE FRIDAY NIGHT.
DISCUSSION
AS OF 1115 PM WEDNESDAY..
KEY MESSAGE 1... THERE WILL BE SOME AREAS OF LIGHT SNOW AND SLEET IN
THE PIEDMONT. THE TRANSITION IS OCCURRING FAIRLY QUICKLY. SOME LIGHT
DUSTING ACCUMULATIONS ARE POSSIBLE OVER THE PIEDMONT. THE WARM AIR
ALOFT IN THE SE WILL KEEP THE TRANSITION THERE SLOWER - THE COLD AIR
AT THE SURFACE WILL UNDERCUT THE WARMER AIR AND PRODUCE LIGHT
RAIN BECOMING LIGHT FREEZING RAIN/DRIZZLE THERE. SOME SPOTTY AND
LIGHT PRECIP MAY LINGER BEYOND 12Z BEFORE ENDING.
KEY MESSAGE 2... LIGHT RAIN MAY MIX WITH SNOW/SLEET FRIDAY EVENING,
NO ACCUMULATIONS ARE EXPECTED.
A LOW-AMPLITUDE CLIPPER WAVE EMBEDDED WITHIN NORTHWESTERLY FLOW IS
EXPECTED TO SHIFT ACROSS THE OHIO VALLEY FRI MORNING THEN PUSH
THROUGH VA/NC FRI EVENING. THIS FEATURE HAS TRENDED SOUTH IN THE
GFS/CMC DETERMINISTIC RUNS AND CLOSER TO THE PERSISTENT ECMWF
SOLUTION. ENSEMBLES FROM THEIR RESPECTIVE GLOBAL MODELS SHOW HIGHER
PROBABILITIES OF MEASURABLE PRECIPITATION ACROSS THE NORTHERN
PIEDMONT TO THE VA BORDER, MORE IN-LINE WITH THE BEST DPVA
ASSOCIATED WITH THE CLIPPER.
TO DETERMINE P-TYPE, A TOP-DOWN METHOD WAS APPLIED. POINT SOUNDINGS
SUGGEST SUFFICIENT SATURATION WITHIN THE ICE-CRYSTAL GROWTH REGION
AND MODERATE OMEGA TO SUPPORT SNOW. HOWEVER, MOST DETERMINISTIC
MODELS DEPICT A DRY AND WARM SUB-CLOUD LAYER (MAX WETBULB OF 1-4C IN
LOWEST 500MB FROM 18-03Z) THAT WILL LIKELY RESULT IN PARTIAL OR
COMPLETE MELTING TO SLEET OR RAIN. SURFACE TEMPERATURES ARE ALSO
EXPECTED TO REMAIN ABOVE FREEZING UNTIL AFTER 00-03Z, AFTER WHICH
TIME PRECIP SHOULD BE MOVING OUT.
LIGHT ACCUMULATIONS OF RAIN WILL BE POSSIBLE, BUT POOR DIURNAL
TIMING AND WARM NEAR-SURFACE LAYER WILL LIKELY PREVENT ANY FROZEN
ACCUMULATIONS AT THIS TIME.
KEY MESSAGE 3... STRONG WINDS SHOULD BE EXPECTED ON SATURDAY BEHIND
A COLD FRONTAL PASSAGE FRIDAY NIGHT.
BEHIND THE CLIPPER WAVE, A HIGHLY AMPLIFIED MID/UPPER LEVEL PATTERN
IS EXPECTED FROM THE TROUGH OVER AND OFF THE EAST COAST AND THE
ANOMALOUS RIDGE OVER THE GREAT PLAINS. AT THE SURFACE, AN AREA OF
BROAD LOW PRESSURE IS EXPECTED TO RAPIDLY DEEPEN TO A SUB-990MB LOW
JUST NORTH OF BERMUDA, WHILE AT THE SAME TIME STRONG > 1030MB HIGH
PRESSURE OVER THE UPPER GREAT LAKES SHIFTS INTO THE OHIO VALLEY BY
SAT EVENING.
STRONG SUBSIDENCE ON THE BACKSIDE OF THE SLOWLY DEPARTING TROUGH
AXIS WILL RESULT IN MOSTLY CLEAR SKIES DURING THE DAYLIGHT HOURS AND
FAVOR EFFICIENT MOMENTUM TRANSFER THROUGH THE BOUNDARY LAYER. WIND
GUSTS SHOULD RAPIDLY DEVELOP THROUGH THE EARLY MORNING HOURS AS
DAYTIME HEATING MIXES INTO THE ELEVATED MIXED LAYER JUST ABOVE THE
SURFACE FROM CAA BEHIND THE FRONT. WIDESPREAD WIND GUSTS OF 25-30
KTS SHOULD BE EXPECTED WITH BOTH NAM AND GFS HIGHLIGHTING SIMILAR
INTENSITY AVERAGED THROUGH THE MIXED LAYER. CLEAR SKIES AND ABUNDANT
INSOLATION, SHOULD RESULT IN EFFICIENT MOMENTUM TRANSFER FROM THE
TOP OF THE MIXED LAYER AND MAY RESULT IN INFREQUENT GUSTS OF 30-
40KTS, STRONGEST FROM THE MID-MORNING TO EARLY AFTERNOON.
AVIATION /06Z THURSDAY THROUGH MONDAY/
AS OF 110 AM THURSDAY...
MVFR TO IFR CIGS AND OCCASIONAL VSBYS WILL CONTINUE THROUGH 12Z AT
ALL SITES. PERIODS OF LIGHT WINTRY PRECIPITATION WILL CONTINUE WITH
PREDOMINATE LIGHT SNOW NW AND LIGHT FREEZING DRIZZLE/SLEET RDU
AND RWI, AND LIGHT RAIN AT FAY. THERE IS STILL A CHANCE OF SOME
LIGHT WINTRY PRECIPITATION BETWEEN 12Z AND 15Z, MAINLY SE OF THE
GSO/INT AREAS.
A GRADUAL IMPROVEMENT TO MVFR THEN VFR WILL OCCUR LATE MORNING
INTO THE AFTERNOON, WITH LINGERING STRATUS BECOMING STRATOCUMULUS
THIS AFTERNOON AS CIGS RISE TO 4-5K FEET BY 18Z-21Z.
LOOKING BEYOND 21Z TODAY, ANY LINGERING SUB-VFR CONDITIONS (MOST
LIKELY AT FAY) AFTER 00Z SHOULD IMPROVE TO VFR BY MID EVENING THU.
VFR CONDITIONS SHOULD THEN PERSIST THROUGH MON, ALTHOUGH A QUICK-
MOVING SYSTEM MAY BRING VERY BRIEF SUB-VFR CIGS AND A LIGHT
SNOW OR RAIN SHOWER MAINLY NE (RDU/RWI) FRI NIGHT. ADDITIONALLY,
BRISK AND GUSTY NW WINDS ARE LIKELY SAT, WHICH MAY INDUCE MECHANICAL
TURBULENCE.
RAH WATCHES/WARNINGS/ADVISORIES
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 10 AM EST THURSDAY
FOR NCZ007>011-021>028-038>043-073>078-083>086-088-089.
DISCUSSION...BADGETT/GREEN
AVIATION...BADGETT
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