309  
FXUS62 KMHX 232313  
AFDMHX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NEWPORT/MOREHEAD CITY NC  
713 PM EDT SUN APR 23 2017  
   
SYNOPSIS
 
 
A FRONTAL BOUNDARY WILL LIFT NORTH AND INLAND ALONG THE COAST LATE  
TONIGHT AS LOW PRESSURE MOVES SLOWLY NORTHEAST ALONG THE COAST  
MONDAY AND TUESDAY. HIGH PRESSURE IN THE CENTRAL ATLANTIC WILL  
BUILD IN WEDNESDAY THROUGH FRIDAY.  
 

 
   
NEAR TERM /UNTIL 6 AM MONDAY MORNING/
 
 
AS OF 7 PM SUNDAY...LATEST SFC ANALYSIS IS SHOWING THE SFC LOW  
OVER GA WHILE SPREADING THE RAIN INTO THE CAROLINAS THIS  
EVENING. BASED ON THE LATEST HI-RES MODELS HAVE REDUCED POPS  
DOWN TO CHANCE AS MOST OF PRECIP WILL BE SCATTERED AND COMING  
FROM THE OCEAN SIDE. THE WARM FRONT WILL WORK ITS WAY BACK NORTH  
LATE TONIGHT WITH TEMPERATURES AND DEWPOINTS SLOWLY CLIMBING BY  
THE EARLY MORNING HOURS...CAUSING AN INCREASE IN INSTABILITY IN  
THE MORNING...WHICH COULD START SOME CONVECTION FIRING UP  
OFFSHORE AND MOVING ONTO LAND. KEPT OVERNIGHT POPS IN THE LIKELY  
RANGE...BUT THINK WHILE THE POPS ARE HIGH, QPF TOTALS WILL BE  
FAIRLY LOW OVERNIGHT. THE OVERNIGHT LOW WILL LIKELY BE AROUND  
MIDNIGHT WITH TEMPERATURES REMAINING STEADY THEN RISING AFTER  
09Z.  
 

 
   
SHORT TERM /6 AM MONDAY MORNING THROUGH 6 PM MONDAY/
 
 
AS OF 410 PM SUNDAY...CLOSED UPPER LOW WILL PIVOT INTO SOUTHERN  
GEORGIA AND SOUTH CAROLINA DURING THE DAY MONDAY AS  
STRENGTHENING SURFACE LOW REDEVELOPS OFF THE SOUTH CAROLINA  
COAST LATE MONDAY AFTERNOON. THIS COUPLED WITH A DEEP FEED OF  
MOISTURE FROM THE E/SE...WILL LEAD TO A THREAT OF HEAVY RAIN AND  
FLASH FLOODING ALONG WITH STRONG GUSTY WINDS. THERE WILL BE THE  
THREAT OF SOME CONVECTION MOVING ONSHORE EARLY IN THE MORNING  
WITH THE WARM FRONT...WITH PERHAPS A FEW BRIEF SPIN-UPS NEAR THE  
COAST. BASED ON SOME OF THE HIGHER-RESOLUTION MODELS...EXPECT  
ONLY SPOTTY SHOWERS AND FAIRLY LIGHT QPF ELSEWHERE THROUGH  
MIDDAY ON MONDAY. BY MONDAY AFTERNOON...MOISTURE TRANSPORT  
INCREASES MARKEDLY AND HEAVY RAINFALL SHOULD BEGIN TO FALL OVER  
INLAND AREAS BY 18-21Z AND INCREASE OVERNIGHT. THE FLASH FLOOD  
WATCH HAS BEEN EXTENDED NORTH AND EAST TO INCLUDE ALL BUT THE  
FAR NORTHERN COUNTIES AND OUTER BANKS. HIGH TEMPERATURES SHOULD  
BE IN THE LOWER 70S OVER MOST AREAS FOR MONDAY.  
 

 
   
LONG TERM /MONDAY NIGHT THROUGH SUNDAY/
 
 
AS OF 245 PM SUN...HEAVY RAIN AND FLASH FLOODING POSSIBLE FOR  
PORTIONS OF EASTERN NC THROUGH TUESDAY MORNING. SUMMER LIKE  
WEATHER EXPECTED LATE WEEK WITH HIGHS IN THE UPPER 80S.  
 
MONDAY NIGHT AND TUESDAY...THE HEAVIEST RAIN IS EXPECTED TO FALL  
MONDAY NIGHT INTO EARLY TUESDAY MORNING. THE HEAVIEST QPF  
CONTINUES TO SHIFT SLIGHTLY WESTWARD, HOWEVER 2-4 INCHES OF RAIN  
IS STILL EXPECTED OVER EASTERN NC. LOCALLY HIGHER AMOUNTS TO 6  
INCHES ARE POSSIBLE WHEREVER STRONG CONVECTION DEVELOPS OR  
TRAINING STORMS OCCUR. SOME HIGH RES. MODELS SHOW A SECONDARY  
AXIS OF HEAVY RAIN FURTHER EAST NEAR CARTERET, CRAVEN, AND  
PAMLICO COUNTIES. WITH STILL MODERATE UNCERTAINTY WHERE THE  
HEAVIEST RAIN WILL FALL, HAVE EXTENDED THE FLASH FLOOD WATCH  
FURTHER EAST TO INCLUDE CARTERET, CRAVEN, PAMLICO, PITT, AND  
BEAUFORT COUNTIES. RAIN APPEARS TO TAPER OFF LATE MONDAY MORNING  
AS A DRY SLOT ENTRAINS INTO THE MATURE CYCLONE THAT WILL BE  
LOCATED JUST OFF THE NC/SC COAST.  
 
ANOTHER CONCERN FOR THIS PERIOD IS THE THREAT OF SEVERE WEATHER.  
AS WINDS PICK UP MONDAY NIGHT, HIGHER DEWPOINTS ARE ADVECTED OFF  
THE GULF STREAM UP INTO THE SOUTHERN NC COASTAL COUNTIES, AND  
LATER INTO THE OBX. AS A RESULT CAPE VALUES INCREASE TO  
1000-1500 J/KG, BULK WIND SHEAR VALUES INCREASE TO 35-45 KNOTS,  
AND 0-1 KM SRH VALUES INCREASE 150-300 M2/S2. THE WINDOW FOR  
SEVERE STORMS AND AN ISOLATED TORNADO LOOKS TO BE 00Z-12Z TUES.  
 
UPPER LEVEL LOW PULLS AWAY LATER IN THE DAY TUESDAY AND SHOWERS  
SLOWER TAPER OFF. HIGHS TUESDAY WILL BE IN THE MID TO UPPER 70S.  
 
WEDNESDAY THROUGH SUNDAY...A BUILDING HEAT WAVE IS EXPECTED  
FOLLOWING THE DEPARTURE OF THE UPR LOW AS HTS/THICKNESSES SOAR  
ABOVE CLIMO. IN FACT MODEL FIELDS INDICATE HEIGHTS UP TO 2  
STANDARD DEVIATIONS ABOVE NORMAL BY LATE IN THE WEEK AS MASSIVE  
RIDGE OF HIGH PRESSURE DEVELOPS OVER THE EASTERN CONUS. IF THIS  
VERIFIES RECORD HIGH TEMPS WOULD CERTAINLY BE THREATENED WITH  
TEMPS IN THE UPR 80S TO LOWER 90S. MAINLY DRY CONDITIONS WITH  
ONLY ISOLATED THREAT FOR SEA BREEZE CONVECTION EACH AFTERNOON,  
MORE TYPICAL OF MID SUMMER VS LATE APRIL.  
 

 
   
AVIATION /00Z MONDAY THROUGH FRIDAY/
 
 
SHORT TERM /THROUGH 18Z MONDAY/  
AS OF 7 PM SUNDAY...HIGH CONFIDENCE OF IFR CONFIDENCE WILL  
DOMINATE MOST OF THE TAF PERIOD. STRONG LOW LEVEL JET WILL  
PREVENT ANY FOG DEVELOPMENT OVERNIGHT, BUT SIGNIFICANT AMT OF  
LOW LEVEL MOISTURE WILL HELP KEEP FLYING CONDITIONS IN THE IFR  
RANGE. FORECAST SOUNDING ARE SHOWING SOME LIFTING DURING THE  
MORNING AS THE WARM FRONT LIFTS NORTH AND PRECIP INCREASES...BUT  
VISIBILITY WILL REMAIN WITH MVFR LEVELS. NE WINDS AT 10-15  
KNOTS WILL CONTINUE TONIGHT THEN INCREASE TO 10-20 KNOTS AND  
GUSTY FOR MONDAY.  
 
LONG TERM /MONDAY THROUGH THURSDAY/...  
AS OF 330 PM SUN...SUB VFR CONDITIONS APPEAR LIKELY THROUGH  
TUESDAY NIGHT WITH WIDESPREAD HEAVY RAIN, SCATTERED  
THUNDERSTORMS, AND GUSTY WINDS. CONDITIONS IMPROVE GREATLY FOR  
WEDNESDAY AND THE REST OF THE WORK WEEK.  
 

 
   
MARINE
 
 
SHORT TERM /TONIGHT AND MONDAY/...  
AS OF 7 PM SUNDAY...NO CHANGE AT THIS TIME. LATEST BUOY OBS ARE  
SHOWING NE WINDS 10-20 GUSTING TO 25 KNOTS. SEAS 5-7 FEET.  
 
GUSTY NE/E WINDS WILL PERSIST THIS EVENING BEFORE DROPPING A  
BIT LATE TONIGHT AND EARLY MONDAY. AS STRONG SURFACE LOW MOVES  
OFF THE SC COAST...WINDS RAMP UP AGAIN LATE MONDAY. HAVE ISSUED  
GALE WARNINGS FOR THE COASTAL WATERS FROM OREGON INLET SOUTH AND  
FOR THE PAMLICO SOUND BEGINNING LATE MONDAY AFTERNOON. SMALL  
CRAFT ADVISORIES REMAIN IN EFFECT UNTIL 11 PM THIS EVENING FOR  
THE ALBEMARLE SOUND...ALLIGATOR RIVER AND COASTAL WATERS NORTH  
OF OREGON INLET AS WINDS CONTINUE TO GUST TO AROUND 25 KNOTS AND  
SEAS ARE AROUND 6 FEET. WINDS/SEAS WILL SUBSIDE TONIGHT BEFORE  
INCREASING AGAIN MONDAY AFTERNOON AND NIGHT AS DEEP CLOSED UPPER  
LOW MOVES ACROSS THE REGION AND STRENGTHENING SURFACE LOW MOVES  
OFF SC COAST BY LATE MONDAY.  
 
LONG TERM /MONDAY THROUGH THURSDAY/...  
AS OF 330 PM SUN...WIDESPREAD RAIN AND SCATTERED THUNDERSTORMS  
APPEAR LIKELY THROUGH TUESDAY AFTERNOON AS A DEEPENING LOW  
PRESSURE SYSTEM APPROACHES THE COASTAL WATERS ON MONDAY, AND  
THEN STALLS OFF THE SOUTHERN NC COAST UNTIL TUESDAY AFTERNOON.  
 
WINDS WILL BE INCREASING MONDAY NIGHT TO 30 TO 35 KNOTS OUT OF  
THE SE WITH WIND GUSTS TO 40 KNOTS. SEAS CONTINUE BUILDING,  
PEAKING 9-14 FT EARLY TUESDAY MORNING GALE WATCH MAY BE NEEDED  
FOR PORTIONS OF THE COASTAL WATERS AS NEAR GALE FORCE WINDS ARE  
EXPECTED. . WINDS ON TUESDAY WILL  
MOSTLY BE OUT OF THE SOUTH 15 TO 25 KNOTS, BEFORE THE LOW  
PRESSURE CROSSES THE REGION TUESDAY AFTERNOON, TURNING WINDS WNW  
AT 10 TO 15 KNOTS. SEAS ON TUESDAY WILL DROP BELOW 10 FEET BY  
LATE MORNING AND BECOME 5 TO 8 FEET. WINDS WEDNESDAY AND  
THURSDAY WILL BE SW AROUND 10 KNOTS, AND SEAS WILL BE 4-6 FT  
WEDNESDAY AND 3-5 FT THURSDAY.  
 

 
   
HYDROLOGY
 
 
AS OF 430 AM SUN...FLASH FLOOD WATCH FOR WESTERN SECTIONS OF  
THE CWA AS THIS AREA HAS BEST CHANCE OF SEEING UPWARDS OF 3-4  
INCHES OF RAIN WITH LOCALLY HIGHER AMOUNTS. HEAVIEST RAIN WILL  
OCCUR MONDAY EVENING THROUGH EARLY TUESDAY MORNING AHEAD OF  
ADVANCING STRONG LOW PRESSURE.  
 

 
   
MHX WATCHES/WARNINGS/ADVISORIES
 
 
NC...FLASH FLOOD WATCH FROM MONDAY AFTERNOON THROUGH TUESDAY  
MORNING FOR NCZ044-079-080-090>095-098.  
BEACH HAZARDS STATEMENT FROM MONDAY MORNING THROUGH MONDAY  
EVENING FOR NCZ095-098-103-104.  
BEACH HAZARDS STATEMENT UNTIL 8 PM EDT THIS EVENING FOR NCZ103.  
MARINE...GALE WARNING FROM 5 PM MONDAY TO 1 AM EDT TUESDAY FOR AMZ135-  
156.  
SMALL CRAFT ADVISORY UNTIL 11 PM EDT THIS EVENING FOR AMZ130-  
131.  
GALE WARNING FROM 5 PM MONDAY TO 5 AM EDT TUESDAY FOR AMZ152-  
154.  
SMALL CRAFT ADVISORY UNTIL 2 PM EDT WEDNESDAY FOR AMZ150.  
GALE WARNING FROM 5 PM TO 11 PM EDT MONDAY FOR AMZ158.  
 

 
 

 
SYNOPSIS...CTC  
NEAR TERM...CTC/BM  
SHORT TERM...CTC  
LONG TERM...SGK  
AVIATION...CTC/BM/SGK  
MARINE...CTC/JBM/BM/SGK  
HYDROLOGY...MHX  
 
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