Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS New York, NY

June 30, 2017Putnam County, Westchester County, New York; Greater Bridgeport Planning Region, Connecticut

NWS New York, NY issued this severe thunderstorm warning at Jun 30, 2017, 6:04 PM EDT for Putnam County, Westchester County, New York; Greater Bridgeport Planning Region, Connecticut. It was in force for 41 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, 2017, 6:04 PM EDT (22:04 UTC)
Expired: Jun 30, 2017, 6:45 PM EDT
In force: 41 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Greater Bridgeport Planning Region, CT, Putnam County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 86 km from the middle of the area, began a volume at 22:09 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, 6:34 PM EDT	TSTM WND DMG	Bethel, CT	TREE DOWN AT 156 WALNUT HILL ROAD BETWEEN WEED ROAD AND OLD HAWLEYVILLE ROAD

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 12:00Z, 10.1 hours before the alert went out and 86 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 60 J/kg
Mixed-layer CIN: -207 J/kg
Mixed-layer LCL: 1070 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

137 
WUUS51 KOKX 302204
SVROKX
CTC001-NYC079-119-302245-
/O.NEW.KOKX.SV.W.0021.170630T2204Z-170630T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New York NY
604 PM EDT FRI JUN 30 2017

The National Weather Service in Upton NY has issued a

* Severe Thunderstorm Warning for...
  Central Fairfield County in southern Connecticut...
  North central Westchester County in southeastern New York...
  Putnam County in southeastern New York...

* Until 645 PM EDT

* At 603 PM EDT, a severe thunderstorm was located near Carmel, or
  near Mahopac, moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* This severe thunderstorm will be near, 
  Carmel around 610 PM EDT. 
  Lake Carmel around 615 PM EDT. 
  Brewster around 620 PM EDT. 
  New Fairfield around 630 PM EDT. 
  Ridgefield around 635 PM EDT. 
  Danbury and Brookfield around 640 PM EDT. 
  Newtown and Bethel around 645 PM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4165 7348 4164 7350 4153 7345 4150 7344
      4151 7339 4149 7337 4147 7332 4147 7330
      4145 7330 4145 7328 4143 7326 4144 7325
      4128 7324 4133 7382 4150 7377 4153 7360
      4153 7353 4165 7352 4166 7351
TIME...MOT...LOC 2203Z 270DEG 23KT 4143 7375 

HAIL...1.00IN
WIND...60MPH
 
$$

PW

2 follow-up statements

767 
WWUS51 KOKX 302220
SVSOKX

Severe Weather Statement
National Weather Service New York NY
620 PM EDT FRI JUN 30 2017

NYC119-302229-
/O.CAN.KOKX.SV.W.0021.000000T0000Z-170630T2245Z/
Westchester NY-
620 PM EDT FRI JUN 30 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WESTCHESTER
COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4165 7349 4164 7350 4153 7345 4150 7344
      4151 7339 4148 7336 4147 7330 4145 7330
      4145 7328 4143 7326 4144 7325 4143 7325
      4128 7324 4131 7355 4137 7355 4136 7364
      4152 7363 4153 7353 4165 7352 4166 7351
TIME...MOT...LOC 2219Z 268DEG 35KT 4141 7357 

$$

CTC001-NYC079-302245-
/O.CON.KOKX.SV.W.0021.000000T0000Z-170630T2245Z/
Fairfield CT-Putnam NY-
620 PM EDT FRI JUN 30 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR CENTRAL FAIRFIELD AND EASTERN PUTNAM COUNTIES...

At 619 PM EDT, a severe thunderstorm was located over Brewster,
moving east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. Heavy downpours are expected.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4165 7349 4164 7350 4153 7345 4150 7344
      4151 7339 4148 7336 4147 7330 4145 7330
      4145 7328 4143 7326 4144 7325 4143 7325
      4128 7324 4131 7355 4137 7355 4136 7364
      4152 7363 4153 7353 4165 7352 4166 7351
TIME...MOT...LOC 2219Z 268DEG 35KT 4141 7357 

HAIL...1.00IN
WIND...60MPH
 
$$

PW

869 
WWUS51 KOKX 302246
SVSOKX

Severe Weather Statement
National Weather Service New York NY
646 PM EDT FRI JUN 30 2017

CTC001-NYC079-302256-
/O.EXP.KOKX.SV.W.0021.000000T0000Z-170630T2245Z/
Fairfield CT-Putnam NY-
646 PM EDT FRI JUN 30 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FAIRFIELD AND EASTERN
PUTNAM COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

LAT...LON 4165 7349 4164 7350 4153 7345 4150 7344
      4151 7339 4148 7336 4147 7330 4145 7330
      4145 7328 4143 7326 4144 7325 4143 7325
      4128 7324 4131 7355 4137 7355 4136 7364
      4152 7363 4153 7353 4165 7352 4166 7351
TIME...MOT...LOC 2246Z 270DEG 23KT 4141 7335 

$$

PW

The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 4:10 PM EDT	Special Weather Statement	OKX	Orange	50 min
Jun 30, 4:32 PM EDT	Severe Thunderstorm Warning	OKX	Orange	30 min
Jun 30, 4:57 PM EDT	Special Weather Statement	OKX	Orange, Putnam	48 min
Jun 30, 5:05 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Putnam	40 min
Jun 30, 5:46 PM EDT	Special Weather Statement	OKX	Putnam	44 min
Jun 30, 6:08 PM EDT	Special Weather Statement	OKX	Orange, Rockland	52 min
Jun 30, 7:02 PM EDT	Special Weather Statement	OKX	Orange, Putnam, Rockland, Westchester	43 min
Jun 30, 6:13 PM EDT	Special Weather Statement	OKX		47 min
Jun 30, 6:38 PM EDT	Severe Thunderstorm Warning	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	37 min
Jun 30, 6:46 PM EDT	Special Weather Statement	OKX		44 min
Jun 30, 7:33 PM EDT	Special Weather Statement	OKX		57 min

Nearby

Severe Thunderstorm Warnings in New York, 2017 Severe Thunderstorm Warnings in Connecticut, 2017 Every severe thunderstorm warning in 2017

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.