Alert archive / Vermont / Flash Flood Warnings in 1990

Flash Flood Warning 33, NWS Burlington, VT

July 4, 1990Lamoille County, Vermont

NWS Burlington, VT issued this flash flood warning at Jul 4, 1990, 9:32 PM EDT for Lamoille County, Vermont. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jul 4, 1990, 9:32 PM EDT (01:32 UTC)
Expired
Jul 5, 1990, 1:30 AM EDT
In force
4 hr
Issued by
NWS Burlington, VT
Area
Whole counties

County Lamoille County, VT

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 1.5 hours before the alert went out and 206 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, Gray, ME at 00:00Z on 1990-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 00:00Z on 1990-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3622 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
205 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBTV 050134
FFWBTV
VTC015-050530-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
932 PM EDT WED JUL 4 1990
 
THE NATIONAL WEATHER SERVICE IN BURLINGTON VT HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL  130 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN NORTH CENTRAL VERMONT
 
   ...LAMOILLE COUNTY
 
HEAVY RAINS HAVE FALLEN ACROSS THE COUNTY THIS AFTERNOON AND
EVENING...WITH MORE THUNDERSTORMS MOVING ACROSS THE COUNTY AT 925 PM.
THIS ADDITIONAL RAIN COMBINED WITH ALREADY SATURATED GROUND WILL
PRODUCE MORE FLOODING TONIGHT. ROUTE 15 NEAR CAMBRIDGE AND ROUTE 108
NEAR SMUGGLERS NOTCH WERE PARTIALLY UNDER WATER IN SPOTS.
 
IF YOU LIVE IN THESE AREAS...BE PREPARED TO MOVE TO HIGHER GROUND.
TRAVELERS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR WASHOUTS ON
ROADWAYS.
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 4, 4:09 PM EDT, 5 hours 23 minutes before
VTZ001-002-003-NYZ011-042115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
408 PM EDT WED JUL 4 1990

...THUNDERSTORMS WERE CONTINUING TO MOVE ACROSS NORTHERN NEW YORK AND
VERMONT...

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR CLINTON COUNTY NEW
YORK AND ALL OF VERMONT EXCEPT BENNINGTON AND WINDHAM COUNTIES UNTIL
1000 PM...

AT 400 PM...RADAR SHOWED SHOWERS AND THUNDERSTORMS FROM NEAR MASSENA
NEW YORK TO NEAR PLATTSBURGH...AND EAST INTO MUCH OF NORTHERN VERMONT
AND NORTHWEST NEW HAMPSHIRE.  IN VERMONT...THE HEAVIEST RAIN WAS
FALLING NEAR BURLINGTON...BRADFORD IN ORANGE COUNTY...AND FROM
PLATTSBURGH TO UNDERHILL VERMONT.

THE STORMS WERE MOVING SOUTHEAST AT 40 MPH.  IF YOU ARE IN THE PATH OF
ANY OF THESE STORMS...BE PREPARED FOR VERY HEAVY RAIN...DANGEROUS AND
FREQUENT LIGHTNING...STRONG GUSTY WINDS AND HAIL.  TAKE SHELTER UNTIL
THE STORMS PASS.

REYNOLDS

The office that day

Everything else NWS Burlington, VT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 4, 8:07 PM EDTFlash Flood WarningBTVWashington3 hr
Jul 4, 9:07 PM EDTFlash Flood WarningBTVChittenden, Franklin4 hr
Jul 4, 10:58 PM EDTFlash Flood WarningBTVWashington3 hr
Jul 4, 11:40 PM EDTSevere Thunderstorm WarningBTVOrange, Washington65 min
Jul 5, 1:29 AM EDTSevere Thunderstorm WarningBTVBennington, Windham61 min
Jul 5, 2:24 AM EDTSevere Thunderstorm WarningBTVCaledonia, Washington66 min

Nearby

Flash Flood Warnings in Vermont, 1990Every flash flood warning in 1990

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.