Alert archive / Pennsylvania / Tornado Watches in 2011
Tornado Watch 701
The Storm Prediction Center issued this tornado watch at Jul 29, 2011, 5:03 PM EDT for Bergen County, Passaic County, Sussex County, New Jersey; 4 counties in New York; 5 counties in Pennsylvania. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2011, 5:03 PM EDT (21:03 UTC)
- Expired
- Jul 29, 2011, 8:20 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Bergen County, NJ, Passaic County, NJ, Sussex County, NJ, Orange County, NY, Putnam County, NY, Rockland County, NY, Westchester County, NY, Lackawanna County, PA, Luzerne County, PA, Monroe County, PA, Pike County, PA, Wayne County, PA
The radar
The Binghamton radar (KBGM), 122 km from the middle of the area, began a volume at 21:03 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 5:11 PM EDT | Tornado Warning | BGM | Pike | 49 min |
| Jul 29, 5:22 PM EDT | Tornado Warning | OKX | Orange, Rockland, Westchester | 38 min |
| Jul 29, 5:34 PM EDT | Severe Thunderstorm Warning | OKX | Orange | 41 min |
| Jul 29, 5:39 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 36 min |
| Jul 29, 5:57 PM EDT | Tornado Warning | OKX | Rockland, Westchester | 33 min |
| Jul 29, 5:59 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 61 min |
| Jul 29, 6:16 PM EDT | Severe Thunderstorm Warning | OKX | Passaic | 44 min |
| Jul 29, 6:26 PM EDT | Tornado Warning | OKX | Westchester | 34 min |
| Jul 29, 6:49 PM EDT | Severe Thunderstorm Warning | OKX | Orange, Rockland, Westchester | 27 min |
| Jul 29, 6:56 PM EDT | Severe Thunderstorm Warning | OKX | Bergen, Passaic | 34 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, 9.1 hours before the alert went out and 169 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 695 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
347
WWUS20 KWNS 292102
SEL1
SPC WW 292102
NJZ000-NYZ000-PAZ000-300300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 701
NWS STORM PREDICTION CENTER NORMAN OK
505 PM EDT FRI JUL 29 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN NEW JERSEY
FAR SOUTHEAST NEW YORK
FAR NORTHEAST PENNSYLVANIA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 505 PM UNTIL
1100 PM EDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 25 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 5 MILES NORTHWEST OF
WILKESBARRE PENNSYLVANIA TO 25 MILES SOUTH SOUTHEAST OF
POUGHKEEPSIE NEW YORK. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 699...WW 700...
DISCUSSION...A NARROW CORRIDOR OF ENHANCED TORNADO POTENTIAL HAS
DEVELOPED ALONG WARM FRONT RETREATING NWD. ONGOING SUPERCELLS WILL
BE CAPABLE OF PRODUCING A COUPLE OF TORNADOES AS THEY INTERACT WITH
THE WARM FRONT LATE THIS AFTERNOON INTO EVENING.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 29030.
...MEADSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 12:57 PM EDT | Mesoscale Discussion | SPC | Bergen, Essex, Hudson, Hunterdon, Morris, Passaic and 4 more | 2 hr |
| Jul 29, 2:40 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Burlington, Camden, Essex, Gloucester, Hudson and 11 more | 8 hr |
| Jul 29, 4:40 PM EDT | Mesoscale Discussion | SPC | Bergen, Burlington, Camden, Essex, Hudson, Hunterdon and 10 more | 95 min |
| Jul 29, 6:17 PM EDT | Mesoscale Discussion | SPC | Salem | 88 min |
| Jul 29, 3:31 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Wyoming | 89 min |
| Jul 29, 3:56 AM EDT | Severe Thunderstorm Watch | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 1 more | 5 hr |
| Jul 29, 2:06 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 9 more | 84 min |
Nearby
Tornado Watches in Pennsylvania, 2011Tornado Watches in New York, 2011Tornado Watches in New Jersey, 2011Every tornado watch in 2011
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.