On Tuesday night, April 27th, a frontal boundary ahead of a low pressure system dropped south across the area, kicking off showers which dumped rainfalls of one-third inch to nearly four inches. Most locations received over an inch of rain. It would be the beginning of a very soggy and windy 4-day period which concluded the month of April.
The system, which developed below low pressure aloft, drifted off the southeastern United States coast through Wednesday the 28th, then stalled offshore. This produced widespread light rains across the area which lasted much of the day and into Thursday the 29th. By the morning of Friday the 30th, the upper low had moved offshore and become separated from the jet stream winds above it which steered the system. It was cutoff and adrift just off the coast. Feeding off the warm Gulf Stream waters, it intensified off our coastline. Meanwhile, high pressure was building down the leeward side of the Appalachians. Strong northeast winds between the two systems pounded the coastal sections, producing wind gusts to 60 miles an hour along the beaches. A coastal flood watch was issued Friday afternoon. Offshore, winds approached hurricane force.
The flow off the Atlantic also ushered in copious amounts of moisture. During the course of Friday and Saturday (May 1st), rainfall reports of 7 to 10 inches were prevalent across portions of coastal southeastern North Carolina. The National Weather Service office at the Wilmington International Airport reported rainfall at the top of the hour for 43 straight hours and 55 out of 60. Three of those hours had rain during the hour, but not at observation time, so 58 out of 60 hours actually contained rain. Flood warnings were posted for the area around the Port City. Totals dropped to 1 to 2 inches far from the coast.
By Sunday morning, the 2nd, a ridge of high pressure aloft moving toward the East Coast kicked the upper low into gear and shoved it out to sea, taking the surface low with it. While winds between the high and low continued to blow at 40 miles an hour along the beaches through the day, the rain came to an end during the early morning. High rainfall totals were around 13 inches in 4 days in the Masonboro Loop area, just outside of Wilmington. Numerous other reports of greater than 10 inches of rain were received from the region. The combination of the heavy rains and tidal flooding caused the lake at Carolina Beach to overflow, flooding the north end of the town for nearly 2 days. Minor beach erosion was reported along New Hanover county's beaches. Areas that had been in a rainfall shortage since the beginning of the year were suddenly back on the wet side.
The image below is the Doppler radar estimate of rainfall from 12:55 PM 4/27 through 10:26 AM 5/2. The heaviest rain was indicated across much of New Hanover into Brunswick county with rainfall totals in excess of twelve inches.
Below is a listing of the rainfall amounts.
PUBLIC INFORMATION STATEMENT...FINAL REVISED NATIONAL WEATHER SERVICE WILMINGTON NC 400 PM EDT MON MAY 3 1999
HERE ARE SOME COASTAL STORM-RELATED RAINFALL AMOUNTS (IN INCHES) FROM AROUND THE AREA. THEY ARE TOTALS FROM 8AM THURSDAY MORNING TO 8AM SUNDAY MORNING:
LOCATION COUNTY TOTAL MASONBORO LOOP AREA (SE OF ILM) NEW HANOVER 13.17 MASONBORO LOOP AREA NEW HANOVER 12.98 LORIS HORRY 12.82 CAROLINA BEACH NEW HANOVER 12.30 WRIGHTSVILLE BEACH NEW HANOVER (INC.) 11.30 LAKE WACCAMAW COLUMBUS 10.98 KINGSTREE WILLIAMSBURG 10.90 WILMINGTON NEW HANOVER (INC.) 10.71 SUNNY POINT MIL. OCEAN TERM. BRUNSWICK 10.71 LELAND BRUNSWICK 10.23 CASTLE HAYNE NEW HANOVER 9.29 WILMINGTON INTL AIRPORT NEW HANOVER 9.03 5 MILES S OF WHITEVILLE COLUMBUS (INC.) 8.84 LONGWOOD BRUNSWICK 8.22 CAPE FEAR LOCK & DAM 1 BLADEN 7.60 1 MILE W OF WRIGHTSVILLE BEACH NEW HANOVER 7.54 OUTLAND GEORGETOWN 7.33 FAIR BLUFF COLUMBUS 6.86 7 MILES NW OF WHITEVILLE COLUMBUS 6.69 EFFINGHAM FLORENCE 5.87 WHITEVILLE COLUMBUS (INC.) 5.78 5 MILES W OF SHALLOTTE BRUNSWICK 5.60 MULLINS MARION 5.51 CADES WILLIAMSBURG 5.49 WATHA PENDER 5.25 LUMBERTON ROBESON 5.16 MOORES CREEK NATL BATTEFIELD PENDER (INC.) 4.94 LUMBERTON AIRPORT ROBESON 4.84 FLORENCE REGIONAL AIRPORT FLORENCE 4.78 CONWAY HORRY (INC.) 4.77 DARLINGTON DARLINGTON 4.77 2 MILES N OF HARTSVILLE DARLINGTON 4.72 HARTSVILLE DARLINGTON 4.65 DILLON DILLON 4.30 8 MILES NE OF HARTSVILLE DARLINGTON 4.13 NORTH MYRTLE BEACH HORRY 3.74 WILLIAM O. HUSKE LOCK & DAM BLADEN 3.26
(INC.) MEANS INCOMPLETE DATA
OTHER NOTE OF INTEREST: WILMINGTON INTERNATIONAL AIRPORT HAD 43 STRAIGHT HOURS OF RAINFALL AND 55 HOURS OUT OF 60 OVERALL FROM THURSDAY AFTERNOON TO LATE SATURDAY NIGHT.