Alert archive / Vermont / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 98, NWS Burlington, VT

August 18, 20085 counties in Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Aug 18, 2008, 8:44 PM EDT for 5 counties in Vermont. It was in force for 61 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: Aug 18, 2008, 8:44 PM EDT (00:44 UTC)
Expired: Aug 18, 2008, 9:45 PM EDT
In force: 61 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon

Counties Caledonia County, VT, Essex County, VT, Lamoille County, VT, Orleans County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 72 km from the middle of the area, began a volume at 00:46 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 18, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.7 hours before the alert went out and 245 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: 1375 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 18, 7:31 PM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, Aug 18, 7:31 PM EDT, 1 hour 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
731 PM EDT MON AUG 18 2008

.SYNOPSIS...
A STRONG FRONTAL BOUNDARY WILL PUSH SOUTH THROUGH THE NORTH
COUNTRY INTO THE EVENING HOURS. THIS WILL BRING PRECIPITATION TO
THE REGION DURING THIS TIME. HIGH PRESSURE THEN BUILDS OVER THE
AREA DURING THE DAY TUESDAY...RIGHT INTO THE END OF THE WEEK. A
FRONTAL BOUNDARY WILL APPROACH THE REGION BY THE WEEKEND FOR
ANOTHER ROUND OF PRECIPITATION.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
AS OF 405 PM EDT MONDAY...REGION UNDER SVR THUNDERSTORM WATCH ATTM
AS STRONG FRNTL BOUNDARY SLOWLY TRUDGES SOUTHWARD. TEMPS ACROSS
THE REGION INTO THE 70S/80S WITH TD/S INTO THE 60S. UNSTABLE
AIRMASS WILL SUPPORT POTENTIAL SEVERE TS WITH WIND AND HAIL. MDLS
HAVE SHOWN SLOW MVMNT W/ FRNT WHICH PUTS ACTIVITY AFT EVENING
COMMUTE...ALTHOUGH SCT TS POPPING UP AHEAD OF SYSTEM. EXPECTING
THIS TO PUSH THRU THE CWA OVERNGT.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/...
AS OF 405 PM EDT MONDAY...FRNTL BOUNDARY WILL BE SOUTH OF THE CWA
BY TUESDAY MORN. NORTHERLY FLOW AHEAD OF APPROACHING SFC RIDGE
WILL KEEP LL CLD COVER OVER MUCH OF THE CWA THRU THE MORNING HRS.
WILL BEGIN TO THIN OUT DURING THE AFTNOON AND FINALLY CLR BY THE
EVENING. THIS WILL SET UP THE CWA FOR A NICE RADIATIONAL COOLING
NIGHT. MDL GUIDANCE TEMPS PUT PORTIONS OF THE DACKS INTO THE
30S...WHICH WOULD GIVE THE POTENTIAL FOR SOME SCT FROST. 850 TEMP
0F 2-4C OVER THE DACKS W/ CLR SKIES WOULD SUPPORT THIS...SO NEXT
SHIFT WILL HAVE TO DECIDE IF A FROST ADVISORY IS WARRANTED. HIGH
PRESSURE CRESTS OVERHD ON WED FOR ANOTHER NICE DRY DAY OVER THE
AREA.

&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
AS OF 240 PM EDT MONDAY...HIGH PRESSURE CENTER MOVES OVER REGION
ON THURSDAY...AND SHIFTS SLOWLY EAST INTO THE GULF OF MAINE BY
SATURDAY. GRADUAL MODERATION IN TEMPS EXPECTED THURSDAY THROUGH
SATURDAY AS AIRMASS MODIFIES AND RETURN SOUTHERLY FLOW DEVELOPS BY
NEXT WEEKEND. AN INCREASE IN MOISTURE EXPECTED BY SUNDAY IN
ADVANCE OF UPPER LEVEL TROUGH AND ASSOCIATED COLD FRONT DROPPING
SOUTHEAST FROM THE GREAT LAKES REGION. BEST CHANCE FOR SEEING SOME
SHOWERS AND THUNDERSTORMS WITH THIS FEATURE LOOKS TO BE SUNDAY
AFTERNOON INTO EARLY MONDAY.

&&

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
THROUGH 00Z WEDNESDAY...ATMOSPHERE DESTABILIZING ACROSS THE FORECAST
AREA AT THIS TIME IN ADVANCE OF STRONG COLD FRONT...WHICH WILL
DROP SOUTH ACROSS THE REGION TONIGHT. EXPECT SCATTERED
THUNDERSTORMS TO CONTINUE ACROSS VERMONT AND NORTHERN NEW YORK THIS
EVENING MAINLY BTWN 00Z-06Z TUES. A PERIOD OF IFR CONDITIONS AND
PERHAPS SOME STRONG WIND GUSTS AND HAIL ARE POSSIBLE WITH THESE
STORMS. THE COLD FRONT WILL BE ALONG THE CANADIAN BORDER BY
02Z...AND SOUTH OF THE REGION BY 08Z TUES. WINDS WILL SHIFT INTO NW
OVRNGHT WITH PASSAGE OF FRONT. POST FRONTAL LLVL MSTR LINGERS ACRS
MUCH OF THE AREA LATE TONIGHT INTO TUESDAY MORNING. ANY SHWRS WILL
END...BUT SOME AREAS OF MVFR/IFR CIGS WILL PERSIST TILL ABOUT 14Z
TUES...AFTER WHICH TIME THERE WILL BE A DECREASE IN CLOUD COVER.

00Z WEDNESAY THROUGH SATURDAY...A RIDGE OF HIGH PRESSURE WILL BUILD
SOUTHEAST FROM THE GREAT LAKES TUESDAY AND BE OVER VERMONT AND
NORTHERN NEW YORK THROUGH FRIDAY...MOVING OFF THE EAST COAST
SATURDAY. MAINLY VFR CONDITIONS EXPECTED THROUGH THE PERIOD. SOME
AREAS OF RADIATION FOG ARE POSSIBLE THROUGH THE PERIOD IN THE
SHELTERED VALLEYS...MAINLY BTWN 06Z-12Z EACH DAY...INCLUDING TAF
SITES KMPV/KLSK.

&&

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

&&

SYNOPSIS...JN
NEAR TERM...JN
SHORT TERM...JN
LONG TERM...RJS
AVIATION...RJS/DUMONT

Hazardous weather outlook, Aug 18, 3:50 PM EDT, 4 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BURLINGTON VT
350 PM EDT MON AUG 18 2008

NYZ026>031-034-035-087-VTZ001>012-016>019-192000-
NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON-
SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON-
WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-
WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-CALEDONIA-
WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-WINDSOR-
EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-EASTERN RUTLAND-
350 PM EDT MON AUG 18 2008

...SEVERE THUNDERSTORM WATCH 838 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL
VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN
VERMONT.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

In the hours before

Local storm report, Aug 18, 7:17 PM EDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BURLINGTON VT
717 PM EDT MON AUG 18 2008

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

0551 PM     TSTM WND DMG     6 NW CHIPMAN            44.84N 75.28W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN IN WADDINGTON.

0609 PM     TSTM WND DMG     LISBON                  44.73N 75.32W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN.

0609 PM     TSTM WND DMG     NORFOLK                 44.80N 74.99W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN.

0627 PM     TSTM WND DMG     POTSDAM                 44.67N 74.99W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN.

&&

ERICE

Local storm report, Aug 18, 7:22 PM EDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BURLINGTON VT
722 PM EDT MON AUG 18 2008

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

0658 PM     TSTM WND DMG     15 S MALONE             44.63N 74.29W
08/18/2008                   FRANKLIN           NY   AMATEUR RADIO

            8 TO 10 INCH DIAMETER TREE DOWN ON POWER LINE.

&&

ERICE

Local storm report, Aug 18, 7:43 PM EDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BURLINGTON VT
743 PM EDT MON AUG 18 2008

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

0735 PM     TSTM WND DMG     2 N SARANAC             44.68N 73.74W
08/18/2008                   CLINTON            NY   AMATEUR RADIO

            TREES DOWN ON POWER LINES ON RYAN RD.

&&

DONNYD

Local storm report, Aug 18, 7:58 PM EDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BURLINGTON VT
758 PM EDT MON AUG 18 2008

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

0548 PM     HAIL             SWANTON                 44.92N 73.12W
08/18/2008  M0.25 INCH       FRANKLIN           VT   TRAINED SPOTTER

0551 PM     TSTM WND DMG     6 NW CHIPMAN            44.84N 75.28W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN IN WADDINGTON.

0609 PM     TSTM WND DMG     NORFOLK                 44.80N 74.99W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN.

0609 PM     TSTM WND DMG     LISBON                  44.73N 75.32W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN.

0627 PM     TSTM WND DMG     POTSDAM                 44.67N 74.99W
08/18/2008                   ST. LAWRENCE       NY   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN.

0658 PM     TSTM WND DMG     15 S MALONE             44.63N 74.29W
08/18/2008                   FRANKLIN           NY   AMATEUR RADIO

            8 TO 10 INCH DIAMETER TREE DOWN ON POWER LINE.

0730 PM     TSTM WND DMG     PERU                    44.58N 73.53W
08/18/2008                   CLINTON            NY   LAW ENFORCEMENT

            TREES DOWN...TIME ESTIMATED.

0735 PM     TSTM WND DMG     2 N SARANAC             44.68N 73.74W
08/18/2008                   CLINTON            NY   AMATEUR RADIO

            TREES DOWN ON POWER LINES ON RYAN RD.

&&

ERICE

Local storm report, Aug 18, 8:33 PM EDT, 11 minutes before

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Local storm report, Aug 18, 8:35 PM EDT, 9 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:17 PM EDT	Areal Flood Advisory	BTV	Franklin, St. Lawrence	3 hr

Nearby

Severe Thunderstorm Warnings in Vermont, 2008 Every severe thunderstorm warning in 2008

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.