Alert archive / New York / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 9, NWS Burlington, VT

July 5, 1999St. Lawrence County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jul 5, 1999, 8:32 PM EDT for St. Lawrence County, New York. It was in force for 63 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 5, 1999, 8:32 PM EDT (00:32 UTC)
Expired: Jul 5, 1999, 9:35 PM EDT
In force: 63 min
Issued by: NWS Burlington, VT
Area: Whole counties

County St. Lawrence County, NY

The radar

The Ft Drum radar (KTYX), 94 km from the middle of the area, began a volume at 00:32 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.

What was reported inside it

Time	Report	Where
Jul 5, 8:45 PM EDT	Thunderstorm Wind	Ogdensburg, NY
Jul 5, 9:40 PM EDT	Thunderstorm Wind	Cranberry Lake, NY
Jul 5, 9:40 PM EDT	Thunderstorm Wind	Hammond, NY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 5, 5:15 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.5 hours before the alert went out and 226 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: 3370 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 12.1

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 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 Jul 5, 5:30 PM EDT, 3 hours 2 minutes earlier.

Area forecast discussion, Jul 5, 5:30 PM EDT, 3 hours 2 minutes before

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In the hours before

Special weather statement, Jul 5, 5:00 PM EDT, 3 hours 32 minutes before

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Special weather statement, Jul 5, 5:00 PM EDT, 3 hours 32 minutes before

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Local storm report, Jul 5, 7:59 PM EDT, 33 minutes before

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Local storm report, Jul 5, 8:05 PM EDT, 27 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
Jul 5, 10:26 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Franklin, Grand Isle	59 min
Jul 6, 1:25 PM EDT	Severe Thunderstorm Warning	BTV	Franklin	60 min
Jul 6, 1:55 PM EDT	Severe Thunderstorm Warning	BTV	Lamoille, Orleans	60 min
Jul 6, 2:08 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Washington	57 min
Jul 6, 2:08 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia	57 min
Jul 6, 2:39 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Rutland	61 min
Jul 6, 3:07 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Orange, Washington, Windsor	68 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
Jul 6, 4:02 PM EDT	Severe Thunderstorm Warning	BTV	Clinton	63 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.