Alert archive / New Jersey / Flash Flood Warnings in 2003

Flash Flood Warning 15, NWS Philadelphia/Mount Holly

July 22, 2003Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 22, 2003, 9:40 PM EDT for Morris County, Somerset County, New Jersey. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 22, 2003, 9:40 PM EDT (01:40 UTC)
Expired: Jul 23, 2003, 12:00 AM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 01:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.7 hours before the alert went out and 145 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1806 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 535 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS51 KPHI 230139
FFWPHI
NJC027-035-230600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
940 PM EDT TUE JUL 22 2003

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MORRIS COUNTY IN NORTHERN NEW JERSEY
  SOMERSET COUNTY IN NORTHERN NEW JERSEY

* UNTIL 200 AM EDT.

* AT 935 PM EDT...WEATHER SERVICE RADAR INDICATED THAT SHOWERS AND 
THUNDERSTORMS WERE CONTINUING TO BUILD INTO THE REGION FROM THE 
SOUTHWEST.  HEAVY RAIN WILL FALL OVER THE SAME LOCATIONS THAT WERE 
AFFECTED ON MONDAY EVENING AND THIS AFTERNOON.  ADDITIONAL RAINFALL 
AMOUNTS OF AT LEAST ONE TO TWO INCHES WILL BE COMMON OVERNIGHT.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER 
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

$$

LAT...LON 4098 7434 4077 7437 4045 7458 4038 7468
          4049 7472 4068 7473 4078 7486 4107 7450

IOVINO

1 follow-up statement

000 
WGUS71 KPHI 230255
FFSPHI
NJC019-027-035-041-PAC017-091-095-230500-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1055 PM EDT TUE JUL 22 2003

...FLASH FLOOD WARNING DISCONTINUED FOR NORTHAMPTON COUNTY IN 
PENNSYLVANIA AND FOR WARREN COUNTY IN NEW JERSEY...

...FLASH FLOOD WARNING CONTINUES UNTIL MIDNIGHT FOR UPPER MONTGOMERY 
COUNTY AND UPPER BUCK COUNTY IN PENNSYLVANIA...

...FLASH FLOOD WARNING CONTINUES UNTIL 100 AM FOR HUNTERDON COUNTY 
IN NEW JERSEY...

...FLASH FLOOD WARNING CONTINUES UNTIL 200 AM FOR SOMERSET COUNTY 
AND FOR MORRIS COUNTY IN NEW JERSEY...

THE POTENTIAL FOR HEAVY RAIN, AT LEAST FOR THE OVERNIGHT, HAS 
DIMINISHED IN NORTHAMPTON COUNTY AND IN WARREN COUNTY.  AS A RESULT, 
THE FLASH WARNING HAS BEEN DISCONTINUED IN THOSE COUNTIES.  HOWEVER, 
A FLOOD WATCH REMAIN IN EFFECT FOR THE POTENTIAL FOR ADDITIONAL 
HEAVY RAIN DURING THE NEXT TWO DAYS.

THE FLASH FLOOD WARNINGS REMAIN IN EFFECT FOR THE UPPER PARTS OF 
MONTGOMERY COUNTY AND BUCKS COUNTY IN PENNSYLVANIA.  THE FLASH FLOOD 
WARNINGS ALSO REMAIN IN EFFECT FOR THE NEW JERSEY COUNTIES OF 
HUNTERDON, MORRIS AND SOMERSET.

WHERE THE WARNINGS REMAIN IN EFFECT THERE CONTINUES TO BE THE 
POTENTIAL FOR SOME HEAVY DOWNPOURS OVERNIGHT AS ADDITIONAL SHOWERS 
AND THUNDERSTORMS MOVE UP FROM THE SOUTH AND SOUTHWEST.  EXCESSIVE 
RUNOFF FROM THOSE STORMS MAY CAUSE FLASH FLOODING OF SMALL CREEKS 
AND STREAMS...HIGHWAYS AND UNDERPASSES.  ADDITIONALLY COUNTRY ROADS 
AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER LOW 
LYING AREAS ARE SUBJECT TO FLOODING.

$$

IOVINO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 8:50 PM EDT	Flash Flood Warning	PHI	Hunterdon, Warren	3 hr

Nearby

Flash Flood Warnings in New Jersey, 2003 Every flash flood warning in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.