Alert archive / Massachusetts / Flash Flood Warnings in 1998

Flash Flood Warning 55, NWS Boston/Norton, MA

June 30, 1998Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jun 30, 1998, 11:27 AM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 4 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
Jun 30, 1998, 11:27 AM EDT (15:27 UTC)
Expired
Jun 30, 1998, 3:25 PM EDT
In force
4 hr
Issued by
NWS Boston/Norton, MA
Area
Whole counties

Counties Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 20 km from the middle of the area, began a volume at 15:27 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

Chatham, MA (KCHH), launched 12:00Z, 3.5 hours before the alert went out and 94 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-pSkew-T log-p diagram, Chatham, MA at 12:00Z on 1998-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 957 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 1998-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
957 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
536 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBOS 301549 COR
FFWBOS
MAC021-023-301925-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED THIRD BULLET
NATIONAL WEATHER SERVICE TAUNTON MA
1127 AM EDT TUE JUN 30 1998

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN NORFOLK COUNTY IN EASTERN MASSACHUSETTS
  NORTHERN PLYMOUTH COUNTY IN SOUTHEASTERN MASSACHUSETTS

* UNTIL 325 PM EDT

* AT 1120 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAIN ON A LINE FROM EASTERN
  CONNECTICUT NORTHEAST ACROSS NORTHERN PLYMOUTH COUNTY...MOVING
  NORTHEAST AT 25 MPH.

* TORRENTIAL RAINS OF 3 INCHES HAVE ALREADY FALLEN IN PARTS OF
  EASTERN NORFOLK AND NORTHERN PLYMOUTH COUNTIES.  AN ADDITIONAL 2 TO
  3 INCHES OF RAIN IS EXPECTED BY 2 PM.  THIS WILL BRING RIVERS AND
  SMALL STREAMS RAPIDLY OVER THEIR BANKS.

AREAS FROM BRIDGEWATER TO PEMBROKE NORTH THROUGH MILTON AND
COHASSET WILL EXPERIENCE FLOODING FROM THESE HEAVY RAINS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.

VALLEE/FAIR

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 10:14 AM EDTFlash Flood WarningBOXBristol, Norfolk4 hr

Nearby

Flash Flood Warnings in Massachusetts, 1998Every flash flood warning in 1998

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.