Alert archive / Vermont / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 22, NWS Burlington, VT

June 28, 2005Grand Isle County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jun 28, 2005, 9:20 PM EDT for Grand Isle County, Vermont. It was in force for 39 min. 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 28, 2005, 9:20 PM EDT (01:20 UTC)
Expired
Jun 28, 2005, 9:59 PM EDT
In force
39 min
Issued by
NWS Burlington, VT
Area
Counties, with a storm outline in the text

County Grand Isle County, VT

The radar

The Burlington radar (KCXX), 33 km from the middle of the area, began a volume at 01:20 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

Albany, NY (KALY), launched 00:00Z, 1.3 hours before the alert went out and 238 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, Albany, NY at 00:00Z on 2005-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1353 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, Albany, NY at 00:00Z on 2005-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
1353 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
976 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 28, 2:35 PM EDT, 6 hours 45 minutes earlier.

Area forecast discussion, Jun 28, 2:35 PM EDT, 6 hours 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
235 PM EDT TUE JUN 28 2005

.SHORT TERM (TONIGHT THROUGH FRIDAY)...
A FEW MORE DAYS OF THE WARM SOUPY WEATHER...THEN RELIEF BY THE END
OF THE WEEK. DIURNAL THUNDERSTORMS HAVE DEVELOPED IN THE AFTERNOON
HEATING OVER THE HIGHER TERRAIN...AS LAPS SURFACE BASED CAPES
APPROACHING 2000 J/KG. LOW PRESSURE AREA WITH TROPICAL HISTORY
ACROSS FAR SOUTHERN VT IN KALYS AREA FORECAST TO MOVE EAST INTO
CENTRAL NEW ENGLAND...AND NOT HAVE AN EFFECT ON BTVS FORECAST AREA.
SHOWERS/THUNDERSTORMS TO CONTINUE INTO THE EVENING...THEN DISSIPATE
AS SUN SETS AND AIRMASS STABILIZES. STORMS ARE MOVING VERY
SLOWLY...AND PWATS 1.25 TO 1.5 AREAS UNDER THE STORMS CAN PICK UP A
QUICK 1 TO 1.5 INCHES.

FOR WEDNESDAY...A WEAK COLD FRONT IS FORECAST TO MOVE INTO THE AREA
IN FITS AND STARTS...ALTHOUGH IT WILL HAVE SOME SUPPORT IN A 5H
TROUGH. BY 12Z...A SURFACE PRE-FRONTAL TROUGH WILL BE EAST/WEST
ACROSS CENTRAL PART OF AREA...WITH FRONT TO NORTH ACROSS ST.LAWRENCE
VALLEY. DURING THE DAY THE TROUGH AND FRONT WILL SAG SOUTHWARD...AND
BE THE FOCUS OF CONVECTION. LEFT LIKELY POPS ALL DAY...THINKING
TROUGH COULD TRIGGER PRECIP IN THE MORNING...THEN FRONT IN THE
AFTERNOON. THE FRONT WILL STALL ACROSS THE REGION HOWEVER...AND
PROVIDE ONLY MINIMAL RELIEF FROM WARM TEMPS AND HIGH HUMIDITY.

FOR THURS...APPROACHING LOW PRESSURE FROM WEST WILL TURN WINDS
SOUTHERLY...AND BRING RETURN FLOW OF WARM HUMID AIR. WERE UNDER
SHORT WAVE RIDGING AT 5H WHICH COULD KEEP US CAPPED...SO WENT WITH
LOWER CHC POPS FOR AFTERNOON/EVENING THUNDERSTORMS.  BROKE UP TIMING
IN GRIDS TO TRY TO SHOW DIURNAL NATURE OF PRECIP. WILL WORD ZONES
WITH CHANCE MAINLY AFTERNOON/EVENING.

&&

.LONG TERM (FRIDAY NIGHT THROUGH TUESDAY)...
FRNT THRU MUCH OF CWA FRIDAY NGT...PUSHING EAST INTO NH BY 06Z-09Z.
WILL CONTINUE MENTION RW/TRW...TAPERING FROM WEST TO EAST WITH
EASTERN VT SEEING LAST OF PRECIP. SFC RIGDE BUILDING DOWN SE FROM
CANADA OVER THE REGION DURING THE DAY SATURDAY...PROVIDING RELIEF
FROM SUMMER TEMPS DURING WEEK. MDLS HAVE RIDGE CONTINUING TO SLIDE
SE OVER THE WEEKEND...SETTING UP SOUTH OF NEW ENGLAND...FOR ANOTHER
ROUND OF WARM/HUMID WX FOR BEGINNING OF WEEK. 850MB TEMPS 16-18C
WORKING INTO AREA ON MONDAY...WOULD TRANSLATE INTO AT LEAST MID TO
UPPER 80S AREA CWA. HPC TEMP GUIDANCE LOW SO WILL TWEAK UP A BIT.
WILL ALSO ADD IN SL CHANCE FOR TRW FOR AFTERNOON/EARLY EVENING
ACROSS AREA. SEEN IN PAST WEEK WITH HUMID AIRMASS OVER AREA...SO
WILL CONTINUE MENTION HERE AS WELL. FRNT APPROACHES FROM WEST MON
NGT INTO TUESDAY. WILL KEEP HIGH CHANCE POPS ALREADY MENTIONED FOR
DAYTIME TUESDAY...BUT ADJUST POPS TO BETTER SHOW FROPA OVER CWA.
ALSO ADJUST SO TEMPS A BIT LOWER FROM MONDAY/S HIGHS.

&&

.AVIATION...
SCAT TS ACROSS MUCH OF CWA THRU 00Z FOR MVFR/IFR COND...OTHERWISE
VFR CONDITIONS W/ SCT MID CLD BKN HIGH CLD DECK. AREAS OF FG/HZ ALL
SITES THRU 10Z-11Z...W/ VFR/MVFR COND...IFR AT TIMES AT KSLK. AFT
11Z LGT -RW INCR FROM W TO E WITH TRW MIXED IN. WINDS SLOWLY
SHIFTING FROM SSW TO WNW...10KTS OR LESS.

&&

.BTV WATCHES/WARNINGS/ADVISORIES...
VT...NONE.
NY...NONE.

&&

SHORT TERM...HANSON
LONG TERM...JN
AVIATION...JN
Hazardous weather outlook, Jun 28, 3:07 AM EDT, 18 hours 13 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BURLINGTON VT
307 AM EDT TUE JUN 28 2005

NYZ026>031-034-035-087-VTZ001>012-016>019-290706-
CALEDONIA VT-EASTERN ADDISON VT-EASTERN CHITTENDEN VT-
EASTERN CLINTON NY-EASTERN ESSEX NY-EASTERN FRANKLIN VT-
EASTERN RUTLAND VT-ESSEX VT-GRAND ISLE VT-LAMOILLE VT-
NORTHERN FRANKLIN NY-NORTHERN ST. LAWRENCE NY-ORANGE VT-ORLEANS VT-
SOUTHEASTERN ST. LAWRENCE NY-SOUTHERN FRANKLIN NY-
SOUTHWESTERN ST. LAWRENCE NY-WASHINGTON VT-WESTERN ADDISON VT-
WESTERN CHITTENDEN VT-WESTERN CLINTON NY-WESTERN ESSEX NY-
WESTERN FRANKLIN VT-WESTERN RUTLAND VT-WINDSOR VT-
INCLUDING THE CITIES OF...BARRE...BETHEL...BRANDON...BURLINGTON...
CANAAN...CANTON...DANBY...ESSEX JUNCTION...FAIR HAVEN...MALONE...
MASSENA...MIDDLEBURY...MONTPELIER...MORRISVILLE...NEWCOMB...
NEWPORT...OGDENSBURG...PLATTSBURGH...POTSDAM...RANDOLPH...RUTLAND...
SARANAC LAKE...SOUTH BURLINGTON...SPRINGFIELD...ST. ALBANS...
ST. JOHNSBURY...SWANTON...VERGENNES...WHITE RIVER JUNCTION...
WILLSBORO AND WINOOSKI
307 AM EDT TUE JUN 28 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHERN VERMONT
AS WELL AS NORTHERN NEW YORK.

.DAY ONE...TODAY...

VERY WARM AND HUMID CONDITIONS WITH TEMPERATURES IN THE UPPER 80S TO
AROUND 90. THE ELDERLY AND VERY YOUNG ARE MOST SUSCEPTIBLE TO THE
DANGERS OF EXCESSIVE HEAT. DO NOT OVER EXERT YOURSELF...DRINK PLENTY
OF WATER, FIND SHADE OR AN AIR CONDITIONED BUILDING AS MUCH AS
POSSIBLE AND NEVER LEAVE CHILDREN OR PETS AN A VEHICLE.

THUNDERSTORMS WILL BECOME MORE NUMEROUS TODAY BUT STILL BE SCATTERED
IN NATURE. ANY THUNDERSTORMS WILL BE VERY SLOW MOVING AND CONTAIN
VERY HEAVY RAIN, THUS THE POTENTIAL DOES EXIST FOR LOCALIZED
FLOODING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

SHOWERS AND THUNDERSTORMS BECOMING MORE NUMEROUS WEDNESDAY THROUGH
FRIDAY THEN DRY COMFORTABLE WEATHER RETURNS.

.SPOTTER CALL TO ACTION STATEMENT...

SKYWARN SPOTTER ACTIVATION NOT EXPECTED AT THE MOMENT.

In the hours before

Local storm report, Jun 28, 6:48 PM EDT, 2 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BURLINGTON VT
648 PM EDT TUE JUN 28 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0642 PM     HAIL             OSWEGATCHIE             44.18N 75.07W
06/28/2005  0.88 INCH        ST. LAWRENCE       NY   TRAINED SPOTTER

&&

PS
Local storm report, Jun 28, 8:09 PM EDT, 1 hour 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 2:20 PM EDTFlash Flood WarningBTVChittenden85 min
Jun 29, 2:50 PM EDTSevere Thunderstorm WarningBTVChittenden27 min
Jun 29, 5:13 PM EDTFlash Flood WarningBTVLamoille2 hr
Jun 29, 3:16 PM EDTFlash Flood WarningBTVEssex89 min
Jun 29, 3:34 PM EDTSevere Thunderstorm WarningBTVClinton41 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2005Every severe thunderstorm warning in 2005

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.