Alert archive / New York / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 39, NWS New York, NY
NWS New York, NY issued this severe thunderstorm warning at Jul 29, 2011, 6:42 PM EDT for Nassau County, Suffolk County, New York. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2011, 6:42 PM EDT (22:42 UTC)
- Expired
- Jul 29, 2011, 7:30 PM EDT
- In force
- 48 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
Counties Nassau County, NY, Suffolk County, NY
The radar
The Brookhaven radar (KOKX), 62 km from the middle of the area, began a volume at 22:44 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 nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.7 hours before the alert went out and 62 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
- 81 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 569 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
911
WUUS51 KOKX 292242
SVROKX
NYC059-103-292330-
/O.NEW.KOKX.SV.W.0039.110729T2242Z-110729T2330Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
642 PM EDT FRI JUL 29 2011
THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NASSAU COUNTY IN SOUTHEAST NEW YORK...
WESTERN SUFFOLK COUNTY IN SOUTHEAST NEW YORK...
* UNTIL 730 PM EDT...
* AT 637 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
EXCESS OF 70 MPH. THIS STORM WAS LOCATED OVER SOUTHERN
WESTCHESTER COUNTY AND MOVING SOUTHEAST AT 30 MPH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS THUNDERSTORM HAS ROTATION AND COULD PRODUCE A TORNADO. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4084 7374 4087 7373 4088 7371 4085 7366
4088 7366 4091 7361 4092 7352 4089 7348
4094 7349 4076 7328 4064 7353 4063 7362
TIME...MOT...LOC 2240Z 318DEG 27KT 4097 7368
$$
JM3 follow-up statements
340
WWUS51 KOKX 292305
SVSOKX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
705 PM EDT FRI JUL 29 2011
NYC059-103-292330-
/O.CON.KOKX.SV.W.0039.000000T0000Z-110729T2330Z/
SUFFOLK NY-NASSAU NY-
705 PM EDT FRI JUL 29 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHEASTERN NASSAU AND WESTERN SUFFOLK COUNTIES...
AT 701 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR EAST NORWICH...OR NEAR OYSTER BAY...MOVING SOUTHEAST AT
30 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COLD
SPRING HARBOR...JERICHO...SYOSSET...WOODBURY...HICKSVILLE...
HUNTINGTON STATION...WEST HILLS...PLAINVIEW...SOUTH HUNTINGTON...
BETHPAGE...LEVITTOWN...MELVILLE...PLAINEDGE...FARMINGDALE...DIX
HILLS...EAST FARMINGDALE...WYANDANCH AND DEER PARK
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 4088 7365 4091 7361 4092 7352 4089 7348
4094 7349 4076 7328 4067 7347
TIME...MOT...LOC 2304Z 318DEG 27KT 4084 7352
$$
JM566 WWUS51 KOKX 292320 SVSOKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW YORK NY 720 PM EDT FRI JUL 29 2011 NYC059-103-292330- /O.CON.KOKX.SV.W.0039.000000T0000Z-110729T2330Z/ SUFFOLK NY-NASSAU NY- 720 PM EDT FRI JUL 29 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT FOR EAST CENTRAL NASSAU AND WESTERN SUFFOLK COUNTIES... AT 718 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR PLAINVIEW...MOVING SOUTHEAST AT 30 MPH. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MELVILLE...DIX HILLS...EAST FARMINGDALE...WYANDANCH AND DEER PARK PRECAUTIONARY/PREPAREDNESS ACTIONS... DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. && LAT...LON 4071 7342 4085 7357 4089 7343 4076 7328 TIME...MOT...LOC 2320Z 315DEG 26KT 4078 7344 $$ JM
599 WWUS51 KOKX 292330 SVSOKX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW YORK NY 730 PM EDT FRI JUL 29 2011 NYC059-103-292339- /O.EXP.KOKX.SV.W.0039.000000T0000Z-110729T2330Z/ SUFFOLK NY-NASSAU NY- 730 PM EDT FRI JUL 29 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL NASSAU AND WESTERN SUFFOLK COUNTIES WILL EXPIRE AT 730 PM EDT... THE THUNDERSTORM HAS WEAKENED TO BELOW SEVERE LEVELS BUT GUSTY WINDS UP TO 40 MPH AND SMALL HAIL WILL STILL BE POSSIBLE WITH THE THUNDERSTORM. LAT...LON 4071 7342 4085 7357 4089 7343 4076 7328 TIME...MOT...LOC 2329Z 315DEG 26KT 4073 7338 $$ JM
The office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 4:01 AM EDT | Small Craft Advisory | OKX | 19 hr | |
| Jul 29, 4:19 PM EDT | Special Weather Statement | OKX | Orange | 41 min |
| Jul 29, 4:32 PM EDT | Severe Thunderstorm Warning | OKX | Orange | 43 min |
| Jul 29, 4:54 PM EDT | Tornado Warning | OKX | Orange | 36 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, 5:57 PM EDT | Tornado Warning | OKX | Rockland, Westchester | 33 min |
| Jul 29, 6:09 PM EDT | Special Marine Warning | OKX | 54 min | |
| Jul 29, 6:16 PM EDT | Severe Thunderstorm Warning | OKX | Orange | 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, 7:13 PM EDT | Severe Thunderstorm Warning | OKX | Kings, New York, Queens | 32 min |
| Jul 29, 7:32 PM EDT | Special Weather Statement | OKX | Nassau | 43 min |
| Jul 29, 7:39 PM EDT | Special Marine Warning | OKX | 36 min | |
| Jul 29, 7:47 PM EDT | Special Weather Statement | OKX | Queens | 28 min |
Nearby
Severe Thunderstorm Warnings in New York, 2011Every severe thunderstorm warning 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.