Alert archive / New York / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Burlington, VT

July 6, 1999Clinton County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jul 6, 1999, 4:02 PM EDT for Clinton County, New York. It was in force for 63 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: Jul 6, 1999, 4:02 PM EDT (20:02 UTC)
Expired: Jul 6, 1999, 5:05 PM EDT
In force: 63 min
Issued by: NWS Burlington, VT
Area: Whole counties

County Clinton County, NY

The radar

The Burlington radar (KCXX), 48 km from the middle of the area, began a volume at 20:01 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
Jul 6, 11:45 AM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.0 hours before the alert went out and 229 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: 1226 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBTV 062004 RRA
SVRBTV
NYC019-062105-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
402 PM EDT TUE JUL 6 1999

THE NATIONAL WEATHER SERVICE IN BURLINGTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLINTON COUNTY IN NORTHERN NEW YORK
  ADJACENT PORTIONS OF LAKE CHAMPLAIN

* UNTIL 505 PM EDT

* AT 355 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS NEAR STANDISH AND IN THE AREA AROUND MOOERS
  NEW YORK...MOVING EAST-SOUTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  RIVERVIEW AND CLAYBURG BY 415 PM
  HARKNESS BY 430 PM
  CHAZY BY 410 PM

THESE ARE A DANGEROUS STORMS. EXPECT DAMAGING WIND...LARGE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. MOVE INSIDE A SAFE INDOOR
SHELTER. STAY AWAY FROM WINDOWS AND DOORS.

MURRAY/WFO BTV

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:32 PM EDT	Severe Thunderstorm Warning	BTV	St. Lawrence	63 min
Jul 5, 9:28 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	47 min
Jul 5, 9:51 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex	74 min
Jul 6, 1:25 PM EDT	Severe Thunderstorm Warning	BTV	Clinton	60 min
Jul 6, 3:35 PM EDT	Severe Thunderstorm Warning	BTV	Franklin	65 min

Nearby

Severe Thunderstorm Warnings in New York, 1999 Every severe thunderstorm warning in 1999

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.