Pennsylvania, 1999

Heavy Rain in Pennsylvania, September 30, 1999

September 30, 1999 · NWS PHI · 10 events in 10 counties and zones

Courtesy of Hurricane Floyd, September 1999 went down as one of the wettest Septembers on record in Pennsylvania. 20 inches was the fifth wettest September on record since 1895.

Where it happened

Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
10

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PHI wrote it up.

Courtesy of Hurricane Floyd, September 1999 went down as one of the wettest Septembers on record in Pennsylvania. The statewide average monthly rainfall 6.20 inches was the fifth wettest September on record since 1895. Monthly rainfall amounts due to the closer proximity to Floyd were higher in Eastern Pennsylvania and were all in double digits. On a county weighted average September monthly rainfall totals ranged from 10.6 inches in Lehigh County to 13.3 inches in Chester County. New all-time monthly precipitation records were set at both the Lehigh Valley (11.57 inches) and Philadelphia (13.07 inches) International Airports. The 13.07 inches of rain also established a new all-time monthly precipitation record for Philadelphia.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

10 heavy rain. Local standard time, as filed.

Heavy Rain, Berks

When
September 30, 11:59 PM EST
Where
Berks forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.416, -75.926 (the zone’s center; the record gives no point)

Heavy Rain, Bucks

When
September 30, 11:59 PM EST
Where
Bucks forecast zone
Reported by
AWOS,ASOS,MESONET,ETC

Heavy Rain, Carbon

When
September 30, 11:59 PM EST
Where
Carbon forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.918, -75.709 (the zone’s center; the record gives no point)

Heavy Rain, Chester

When
September 30, 11:59 PM EST
Where
Chester forecast zone
Reported by
AWOS,ASOS,MESONET,ETC

Heavy Rain, Delaware

When
September 30, 11:59 PM EST
Where
Delaware forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
39.917, -75.399 (the zone’s center; the record gives no point)

Heavy Rain, Lehigh

When
September 30, 11:59 PM EST
Where
Lehigh forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.613, -75.592 (the zone’s center; the record gives no point)

Heavy Rain, Monroe

When
September 30, 11:59 PM EST
Where
Monroe forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
41.058, -75.339 (the zone’s center; the record gives no point)

Heavy Rain, Montgomery

When
September 30, 11:59 PM EST
Where
Montgomery forecast zone
Reported by
AWOS,ASOS,MESONET,ETC

Heavy Rain, Northampton

When
September 30, 11:59 PM EST
Where
Northampton forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.754, -75.307 (the zone’s center; the record gives no point)

Heavy Rain, Philadelphia

When
September 30, 11:59 PM EST
Where
Philadelphia forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
40.008, -75.134 (the zone’s center; the record gives no point)

What these are

Heavy Rain
Rainfall totals unusual for the place and season that did not produce a flood.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Pennsylvania in 1999Every state in 1999This day in weather historyWarnings in Pennsylvania, September 1999

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5722505, 5722506, 5722603, 5722604, 5722605, 5722606, 5722607, 5722608, 5722609, 5722610.