A secondary storm developed over Delaware and eastern Virginia during the afternoon and the original storm filled in.

Light rain started around 10:30 AM. Around noontime there were some rumbles of thunder, which continued off and on for the next few hours. By 3 PM, .27" of rain had fallen. From 5 PM on, the rain picked up in intensity.

Just before 6 PM there was a thunderstorm with some lightning and thunder, very heavy rain, and winds gusting to over 20 mph. .50" of rain fell in 20 minutes. A steady, moderate rain continued. Around 7:45 PM, a series of thunderstorms moved over Long Island. While there was lightning and thunder, nothing that severe. However, heavy and frequent downpours occurred. An inch of rain fell between 8-9 PM. Winds gusted to around 20 mph, but New York City reported winds gusting to 30-40 mph.

The heavy rain ended by 10:30, with light rain, some lightning and thunder continuing off and on until 12:30 AM.

A total of 3.90" of rain had fallen from 10:30 AM to 12:30 AM.

A flood warning had been issued for New York City, Nassau County, and western Suffolk County around 5 PM. The following weather bulletin was put out by the NWS just before 8 PM:

NATIONAL WEATHER SERVICE NEW YORK NY
753 PM EDT FRI APR 21 2000
THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A
* FLASH FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS FOR... MIDDLESEX COUNTY... NEW HAVEN COUNTY... NEW LONDON COUNTY IN CONNECTICUT... AND CENTRAL SUFFOLK COUNTY IN NEW YORK...UNTIL MIDNIGHT...
* AT 747 PM THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE OVER THE WARNED AREA.

Lightning strikes were reported in Huntington Station, Floral Park, Port Washington, & West Islip. Over 6 nches of rain was reported at Baldwin. Major delays at the airports & railroads, with major flooding of roads and highways. Parts of the Sunrise Highway in Lindenhurst were closed. In Brentwood, water flooded a gas station causing the gas to rise out of the tanks and on to the top of the water. The area roadway was closed while crews cleaned up the gas. At least 13,900 residents lost power at one time or another during the storm.

The following is the Storm Report from the NWS for the area:

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW YORK NY
1018 PM EDT THU APR 20 2000 TIME(EDT)
0343 PM 04/21/00 QUEENS 2 TO 3 FEET OF WATER REPORTED IN THE STREETS OF SPRINGFIELD GARDENS
0555 PM 04/21/00 SUFFOLK LINDENHURST,NY FLOODING PARTIAL ROAD CLOSURE FROM RTE. 109 TO WELLWOOD AVE. ON SUNRISE HIGHWAY SPOTTER REPORT 0800 PM 04/21/00 NASSAU EAST MEADOW NY FLOODING SEVERE URBAN FLOODING IN WESTBOUND LIE
0800 PM 04/21/00 SUFFOLK BABYLON NY FLOODING MULTIPLE TOWN-WIDE...CARS TRAPPED IN WATER
0810 PM 04/21/00 SUFFOLK SOUTH HUNTINGTON NY FLOODING ONE FOOT OF WATER ON JERICHO TURNPIKE...ROAD IMPASSABLE

Total Rainfall    3.90"