Alert archive / New York / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 435

June 21, 20076 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2007, 2:47 PM EDT for 6 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 21, 2007, 2:47 PM EDT (18:47 UTC)
Expired
Jun 21, 2007, 10:00 PM EDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 63 counties

Northwest Hills Planning Region, CT, Berkshire County, MA, Bergen County, NJ, Essex County, NJ, Morris County, NJ, Passaic County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Dutchess County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Monroe County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Orange County, NY, Oswego County, NY, Otsego County, NY, Putnam County, NY, Rensselaer County, NY, Rockland County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Wayne County, NY, Westchester County, NY, Yates County, NY, Bradford County, PA, Carbon County, PA, Lackawanna County, PA, Luzerne County, PA, Monroe County, PA, Pike County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming County, PA, Bennington County, VT, Windham County, VT

The radar

The Ft Drum radar (KTYX), 83 km from the middle of the area, began a volume at 18:49 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 21, 2:48 PM EDTSevere Thunderstorm WarningBUFJefferson72 min
Jun 21, 2:54 PM EDTSevere Thunderstorm WarningBGMCayuga, Seneca36 min
Jun 21, 3:03 PM EDTSevere Thunderstorm WarningBUFMonroe42 min
Jun 21, 3:20 PM EDTSevere Thunderstorm WarningBGMChenango, Delaware55 min
Jun 21, 3:28 PM EDTSevere Thunderstorm WarningBGMCayuga, Seneca62 min
Jun 21, 3:35 PM EDTTornado WarningBGMCayuga, Seneca25 min
Jun 21, 3:41 PM EDTSevere Thunderstorm WarningBGMChenango, Otsego64 min
Jun 21, 3:43 PM EDTSevere Thunderstorm WarningBGMTompkins62 min
Jun 21, 3:47 PM EDTSevere Thunderstorm WarningBGMOnondaga58 min
Jun 21, 3:48 PM EDTTornado WarningBGMTompkins47 min
Jun 21, 3:48 PM EDTSevere Thunderstorm WarningBUFOntario36 min
Jun 21, 4:02 PM EDTSevere Thunderstorm WarningBUFJefferson43 min
Jun 21, 4:08 PM EDTSevere Thunderstorm WarningBGMDelaware52 min
Jun 21, 4:08 PM EDTSevere Thunderstorm WarningBGMBroome, Tioga67 min
Jun 21, 4:21 PM EDTSevere Thunderstorm WarningBGMDelaware, Otsego54 min
Jun 21, 4:27 PM EDTSevere Thunderstorm WarningBGMMadison63 min
Jun 21, 4:34 PM EDTSevere Thunderstorm WarningBGMSullivan56 min
Jun 21, 5:01 PM EDTSevere Thunderstorm WarningBGMOneida, Otsego59 min
Jun 21, 5:12 PM EDTSevere Thunderstorm WarningBGMBroome48 min
Jun 21, 5:20 PM EDTSevere Thunderstorm WarningBGMWayne55 min
Jun 21, 5:39 PM EDTSevere Thunderstorm WarningBGMTompkins66 min
Jun 21, 5:49 PM EDTSevere Thunderstorm WarningALYColumbia56 min
Jun 21, 5:53 PM EDTSevere Thunderstorm WarningALYFulton36 min
Jun 21, 5:55 PM EDTSevere Thunderstorm WarningALYBerkshire65 min
Jun 21, 5:58 PM EDTSevere Thunderstorm WarningALYWashington54 min
Jun 21, 6:04 PM EDTSevere Thunderstorm WarningBGMSusquehanna41 min
Jun 21, 6:16 PM EDTSevere Thunderstorm WarningBGMWayne59 min
Jun 21, 6:23 PM EDTSevere Thunderstorm WarningBGMSullivan37 min
Jun 21, 6:34 PM EDTSevere Thunderstorm WarningALYBennington46 min
Jun 21, 6:35 PM EDTSevere Thunderstorm WarningBGMLackawanna, Wyoming55 min
Jun 21, 6:56 PM EDTSevere Thunderstorm WarningPHISussex, Warren64 min
Jun 21, 6:57 PM EDTSevere Thunderstorm WarningBGMPike18 min
Jun 21, 6:58 PM EDTSevere Thunderstorm WarningALYRensselaer62 min
Jun 21, 7:05 PM EDTSevere Thunderstorm WarningPHIMonroe70 min
Jun 21, 7:12 PM EDTSevere Thunderstorm WarningBGMWayne33 min
Jun 21, 7:13 PM EDTSevere Thunderstorm WarningPHICarbon77 min
Jun 21, 8:10 PM EDTSevere Thunderstorm WarningOKXEssex, Hudson35 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 6.8 hours before the alert went out and 167 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 12:00Z on 2007-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2007-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1404 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 21, 1:25 PM EDTMesoscale DiscussionSPC95 min
Jun 21, 5:58 PM EDTMesoscale DiscussionSPC62 min
Jun 21, 2:12 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Fayette, Indiana and 5 more93 min

Nearby

Severe Thunderstorm Watches in New York, 2007Severe Thunderstorm Watches in Pennsylvania, 2007Severe Thunderstorm Watches in New Jersey, 2007Every severe thunderstorm watch in 2007

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.