Alert archive / New York / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 31, NWS New York, NY
NWS New York, NY issued this severe thunderstorm warning at Jun 30, 2021, 9:24 PM EDT for Nassau County, Suffolk County, New York. It was in force for 29 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 30, 2021, 9:24 PM EDT (01:24 UTC)
- Expired
- Jun 30, 2021, 9:53 PM EDT
- In force
- 29 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Nassau County, NY, Suffolk County, NY
The radar
The Brookhaven radar (KOKX), 45 km from the middle of the area, began a volume at 01:23 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 | Remark |
|---|---|---|---|
| Jun 30, 9:30 PM EDT | TSTM WND DMG | Glen Cove, NY | GLEN COVE REPORTS NUMEROUS TREES DOWN ACROSS THE AREA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 1.4 hours before the alert went out and 45 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
- 1308 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1402 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.1
The text
As transmitted.
599
WUUS51 KOKX 010124
SVROKX
NYC059-103-010215-
/O.NEW.KOKX.SV.W.0031.210701T0124Z-210701T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
924 PM EDT Wed Jun 30 2021
The National Weather Service in Upton NY has issued a
* Severe Thunderstorm Warning for...
Western Suffolk County in southeastern New York...
Northeastern Nassau County in southeastern New York...
* Until 1015 PM EDT.
* At 923 PM EDT, a severe thunderstorm was located over Glen Cove,
moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to vehicles is possible. Expect wind
damage to trees and power lines.
* This severe thunderstorm will be near...
Plainview and Syosset around 935 PM EDT.
Melville and Cold Spring Harbor around 940 PM EDT.
Huntington Station and Huntington around 945 PM EDT.
Northport and Dix Hills around 950 PM EDT.
Commack around 955 PM EDT.
Brentwood around 1000 PM EDT.
Hauppauge and Smithtown around 1005 PM EDT.
Ronkonkoma and Stony Brook around 1010 PM EDT.
Centereach and Port Jefferson around 1015 PM EDT.
This includes the following New York State COVID tent site
SUNY Stony Brook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4078 7368 4087 7368 4087 7366 4091 7364
4093 7352 4095 7350 4094 7342 4096 7341
4096 7338 4094 7334 4095 7329 4092 7322
4093 7317 4098 7317 4098 7300 4075 7303
TIME...MOT...LOC 0123Z 271DEG 26KT 4086 7359
HAIL...1.00IN
WIND...60MPH
$$
MW1 follow-up statement
897
WWUS51 KOKX 010153
SVSOKX
Severe Weather Statement
National Weather Service New York NY
953 PM EDT Wed Jun 30 2021
NYC059-103-010202-
/O.CAN.KOKX.SV.W.0031.000000T0000Z-210701T0215Z/
Suffolk NY-Nassau NY-
953 PM EDT Wed Jun 30 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SUFFOLK AND
NORTHEASTERN NASSAU COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds up
to 40 mph are still possible with this thunderstorm.
LAT...LON 4078 7368 4087 7368 4087 7366 4091 7364
4093 7352 4095 7350 4094 7342 4096 7341
4096 7338 4094 7334 4095 7329 4092 7322
4093 7317 4098 7317 4098 7300 4075 7303
TIME...MOT...LOC 0150Z 271DEG 26KT 4086 7331
$$
MWThe office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 8:29 PM EDT | Special Marine Warning | OKX | 61 min | |
| Jun 30, 8:31 PM EDT | Special Weather Statement | OKX | Nassau | 44 min |
| Jun 30, 8:37 PM EDT | Severe Thunderstorm Warning | OKX | Suffolk | 38 min |
| Jun 30, 8:41 PM EDT | Special Weather Statement | OKX | Bronx, New York | 49 min |
| Jun 30, 8:55 PM EDT | Special Marine Warning | OKX | 35 min | |
| Jun 30, 9:06 PM EDT | Special Weather Statement | OKX | Nassau | 39 min |
| Jun 30, 9:07 PM EDT | Special Weather Statement | OKX | Richmond | 38 min |
| Jun 30, 9:30 PM EDT | Special Marine Warning | OKX | 60 min | |
| Jun 30, 9:38 PM EDT | Special Marine Warning | OKX | 67 min | |
| Jun 30, 9:39 PM EDT | Severe Thunderstorm Warning | OKX | Kings, Nassau, New York, Queens, Richmond | 51 min |
| Jun 30, 9:57 PM EDT | Special Weather Statement | OKX | Bronx, New York | 33 min |
| Jun 30, 10:00 PM EDT | Special Marine Warning | OKX | 45 min | |
| Jun 30, 10:22 PM EDT | Special Weather Statement | OKX | Nassau | 23 min |
| Jun 30, 10:45 PM EDT | Special Weather Statement | OKX | Nassau | 45 min |
| Jun 30, 11:27 PM EDT | Special Weather Statement | OKX | Suffolk | 93 min |
| Jul 1, 10:47 AM EDT | Flash Flood Watch | OKX | Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more | 10 hr |
| Jul 1, 7:42 PM EDT | Special Marine Warning | OKX | 50 min |
Nearby
Severe Thunderstorm Warnings in New York, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.