Alert archive / Connecticut / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 6, NWS New York, NY
NWS New York, NY issued this severe thunderstorm warning at Apr 21, 2021, 2:53 PM EDT for Putnam County, Westchester County, New York; Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Connecticut. It was in force for 67 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
- Apr 21, 2021, 2:53 PM EDT (18:53 UTC)
- Expired
- Apr 21, 2021, 4:00 PM EDT
- In force
- 67 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Greater Bridgeport Planning Region, CT, Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Putnam County, NY, Westchester County, NY
The radar
The Brookhaven radar (KOKX), 65 km from the middle of the area, began a volume at 18:54 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 |
|---|---|---|---|
| Apr 21, 3:13 PM EDT | TSTM WND DMG | 2 Sw Georgetown, CT | TREE LIMBS DOWN, POWER OUT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 21, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.9 hours before the alert went out and 65 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
- 1427 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 206 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
204
WUUS51 KOKX 211853
SVROKX
CTC001-007-009-NYC079-119-212000-
/O.NEW.KOKX.SV.W.0006.210421T1853Z-210421T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
253 PM EDT Wed Apr 21 2021
The National Weather Service in Upton NY has issued a
* Severe Thunderstorm Warning for...
Fairfield County in southern Connecticut...
New Haven County in southern Connecticut...
Northern Middlesex County in southern Connecticut...
Westchester County in southeastern New York...
Eastern Putnam County in southeastern New York...
* Until 400 PM EDT.
* At 253 PM EDT, severe thunderstorms were located along a line
extending from Gaylordsville to Port Washington, moving east at 40
mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Bridgeport, New Haven, Stamford, Waterbury, Norwalk, Danbury,
Meriden, White Plains, Milford, Middletown, Wallingford, Shelton,
Naugatuck, Port Chester and Guilford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4150 7344 4147 7332 4151 7316 4164 7298
4164 7294 4156 7295 4155 7285 4163 7269
4123 7277 4125 7292 4114 7309 4112 7330
4105 7338 4097 7365 4087 7375 4103 7379
4152 7362 4153 7353 4167 7352
TIME...MOT...LOC 1853Z 277DEG 36KT 4167 7351 4083 7366
HAIL...0.75IN
WIND...60MPH
$$2 follow-up statements
301
WWUS51 KOKX 211928
SVSOKX
Severe Weather Statement
National Weather Service New York NY
328 PM EDT Wed Apr 21 2021
NYC079-119-211937-
/O.CAN.KOKX.SV.W.0006.000000T0000Z-210421T2000Z/
Westchester NY-Putnam NY-
328 PM EDT Wed Apr 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTCHESTER AND EASTERN PUTNAM
COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
southern Connecticut.
LAT...LON 4156 7295 4155 7285 4158 7275 4163 7269
4123 7277 4125 7278 4125 7292 4119 7301
4120 7305 4117 7309 4114 7309 4116 7317
4113 7322 4112 7330 4104 7340 4149 7325
4151 7316 4164 7298 4164 7294
TIME...MOT...LOC 1927Z 262DEG 33KT 4161 7310 4102 7332
$$
CTC001-007-009-212000-
/O.CON.KOKX.SV.W.0006.000000T0000Z-210421T2000Z/
Fairfield CT-New Haven CT-Middlesex CT-
328 PM EDT Wed Apr 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTHERN FAIRFIELD...NEW HAVEN AND NORTHERN MIDDLESEX COUNTIES...
At 327 PM EDT, severe thunderstorms were located along a line
extending from Oakville to 7 miles south of Westport, moving east at
40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Bridgeport, New Haven, Waterbury, Meriden, Milford, Middletown,
Wallingford, Shelton, Naugatuck, Guilford, Southbury, Wolcott,
Durham, Newtown and Fairfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4156 7295 4155 7285 4158 7275 4163 7269
4123 7277 4125 7278 4125 7292 4119 7301
4120 7305 4117 7309 4114 7309 4116 7317
4113 7322 4112 7330 4104 7340 4149 7325
4151 7316 4164 7298 4164 7294
TIME...MOT...LOC 1927Z 262DEG 33KT 4161 7310 4102 7332
HAIL...0.75IN
WIND...60MPH
$$556
WWUS51 KOKX 211951
SVSOKX
Severe Weather Statement
National Weather Service New York NY
351 PM EDT Wed Apr 21 2021
CTC001-007-009-212001-
/O.EXP.KOKX.SV.W.0006.000000T0000Z-210421T2000Z/
Fairfield CT-New Haven CT-Middlesex CT-
351 PM EDT Wed Apr 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN FAIRFIELD...NEW HAVEN
AND NORTHERN MIDDLESEX COUNTIES WILL EXPIRE AT 400 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
LAT...LON 4156 7295 4155 7285 4158 7275 4163 7269
4123 7277 4125 7278 4125 7292 4119 7301
4120 7305 4117 7309 4114 7309 4116 7317
4113 7322 4112 7330 4104 7340 4149 7325
4151 7316 4164 7298 4164 7294
TIME...MOT...LOC 1951Z 277DEG 36KT 4158 7281 4099 7303
$$The office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 8:48 PM EDT | Freeze Watch | OKX | Orange, Putnam | 7 hr |
| Apr 21, 3:41 AM EDT | Freeze Warning | OKX | Orange, Putnam, Rockland, Westchester | 29 hr |
| Apr 21, 10:58 AM EDT | Special Weather Statement | OKX | Nassau | 47 min |
| Apr 21, 12:52 PM EDT | Special Weather Statement | OKX | Suffolk | 23 min |
| Apr 21, 1:23 PM EDT | Special Weather Statement | OKX | Orange, Rockland | 67 min |
| Apr 21, 1:41 PM EDT | Severe Thunderstorm Warning | OKX | Orange, Rockland | 64 min |
| Apr 21, 2:05 PM EDT | Special Weather Statement | OKX | Bronx, Kings, Nassau, New York, Putnam, Queens and 2 more | 85 min |
| Apr 21, 2:10 PM EDT | Severe Thunderstorm Warning | OKX | Putnam | 50 min |
| Apr 21, 2:12 PM EDT | Severe Thunderstorm Warning | OKX | Bronx, Nassau, New York, Queens, Westchester | 48 min |
| Apr 21, 2:14 PM EDT | Special Marine Warning | OKX | 61 min | |
| Apr 21, 2:28 PM EDT | Severe Thunderstorm Warning | OKX | Westchester | 47 min |
| Apr 21, 2:34 PM EDT | Special Marine Warning | OKX | 86 min | |
| Apr 21, 3:07 PM EDT | Special Marine Warning | OKX | 113 min | |
| Apr 21, 3:17 PM EDT | Severe Thunderstorm Warning | OKX | Nassau, Suffolk | 19 min |
| Apr 21, 12:59 PM EDT | Special Weather Statement | OKX | 46 min | |
| Apr 21, 4:02 PM EDT | Special Weather Statement | OKX | 58 min |
Nearby
Severe Thunderstorm Warnings in Connecticut, 2021Severe 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.