Alert archive / Vermont / Flash Flood Warnings in 1998

Flash Flood Warning 60, NWS Burlington, VT

April 1, 1998Grand Isle County, Vermont

NWS Burlington, VT issued this flash flood warning at Apr 1, 1998, 10:22 AM EST for Grand Isle County, Vermont. It was in force for 5 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
Apr 1, 1998, 10:22 AM EST (15:22 UTC)
Expired
Apr 1, 1998, 3:30 PM EST
In force
5 hr
Issued by
NWS Burlington, VT
Area
Whole counties

County Grand Isle County, VT

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 3.4 hours before the alert went out and 262 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 12:00Z on 1998-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLEL10008507005003002001001 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, Gray, ME at 12:00Z on 1998-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.193958Sfc1 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
3 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
491 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

NWS Burlington, VT wrote its last area forecast discussion before this flash flood warning went out at Apr 1, 9:32 AM EST, 50 minutes earlier.

Area forecast discussion, Apr 1, 9:32 AM EST, 50 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
932 AM EST WED APR 1 1998

TRIPLE POINT NR PEO AT 13Z.  NARROW BAND OF SHWRS JUST GETTING TO
ROC ATTM.  THIS BAND WL SWEEP ACRS THE FA WITH ABT .25-.50.  ANY
PCPN WL NOT HELP FLD SITN.

MR PCPN WL OCCUR TNT INTO THU AS OCCLD LOW MVS CLSR TO FA.  CUD SEE
ANTHR .25-.50.  LCL AMTS THRU THU CUD APPROACH AN INCH.  ALL THIS
MEANS THE FLOODING WL CONT THRU THE END OF THE WEEK.

PLENTY OF THIN SPOTS SHWG UP IN VSB PIX.  CUD MNTN A PEEK OR TWO OF
SUN.

FNT WONT MK IT UP INTO FA TDY BUT ANY SUN SHUD HELP TEMPS JUMP A
BIT.  CUD BUMP UP TEMPS A BIT DUE TO SOLAR EFFECTS.

MCGILL

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 1, 3:32 AM ESTFlash Flood WarningBTVCaledonia, Essex, Orleans12 hr
Apr 1, 3:32 AM ESTFlash Flood WarningBTVFranklin, Lamoille12 hr
Apr 1, 3:32 AM ESTFlash Flood WarningBTVAddison, Orange12 hr
Apr 1, 3:32 AM ESTFlash Flood WarningBTVRutland12 hr
Apr 1, 3:20 PM ESTFlash Flood WarningBTVCaledonia, Essex, Lamoille, Orange, Orleans12 hr
Apr 1, 3:20 PM ESTFlash Flood WarningBTVAddison, Rutland12 hr
Apr 1, 3:20 PM ESTFlash Flood WarningBTVFranklin, Grand Isle12 hr
Apr 1, 3:32 AM ESTFlash Flood WarningBTVClinton, Franklin12 hr
Apr 1, 3:32 AM ESTFlash Flood WarningBTVSt. Lawrence12 hr
Apr 1, 10:22 AM ESTFlash Flood WarningBTVEssex5 hr
Apr 1, 3:20 PM ESTFlash Flood WarningBTVClinton, Essex, Franklin, St. Lawrence12 hr

Nearby

Flash Flood Warnings in Vermont, 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.