Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 85, NWS Buffalo, NY

August 1, 2017Monroe County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 1, 2017, 7:17 PM EDT for Monroe County, New York. It was in force for 43 min. 2 reports 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: Aug 1, 2017, 7:17 PM EDT (23:17 UTC)
Expired: Aug 1, 2017, 8:00 PM EDT
In force: 43 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Monroe County, NY

The radar

The Buffalo radar (KBUF), 74 km from the middle of the area, began a volume at 23:19 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
Aug 1, 7:30 PM EDT	HAIL 0.5	2 Wnw Spencerport, NY
Aug 1, 7:33 PM EDT	HAIL 1	2 N Spencerport, NY

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.3 hours before the alert went out and 72 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: 318 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 975 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

016 
WUUS51 KBUF 012317
SVRBUF
NYC055-020000-
/O.NEW.KBUF.SV.W.0085.170801T2317Z-170802T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
717 PM EDT TUE AUG 1 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northwestern Monroe County in western New York...

* Until 800 PM EDT.

* At 717 PM EDT, a severe thunderstorm was located over Churchville,
  or near Chili, moving east at 15 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to trees and power lines. 

* Locations impacted include...
  Rochester, Greece, Chili, Brighton, Gates-North Gates, Spencerport,
  Churchville and Riga.

This includes Interstate 390 near exit 12.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4306 7791 4310 7792 4313 7791 4314 7793
      4319 7795 4328 7771 4305 7761
TIME...MOT...LOC 2317Z 249DEG 12KT 4313 7787 

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

Church

3 follow-up statements

730 
WWUS51 KBUF 012333
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
733 PM EDT TUE AUG 1 2017

NYC055-020000-
/O.CON.KBUF.SV.W.0085.000000T0000Z-170802T0000Z/
Monroe NY-
733 PM EDT TUE AUG 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN MONROE COUNTY...

At 733 PM EDT, a severe thunderstorm was located over Spencerport, or
near Greece, moving northeast at 15 mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
Rochester, Greece, Chili, Brighton, Gates-North Gates, Spencerport,
North Chili and Rochester International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4310 7786 4321 7790 4328 7771 4309 7763
TIME...MOT...LOC 2333Z 230DEG 13KT 4320 7781 

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

Church

747 
WWUS51 KBUF 012347
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
747 PM EDT TUE AUG 1 2017

NYC055-020000-
/O.CON.KBUF.SV.W.0085.000000T0000Z-170802T0000Z/
Monroe NY-
747 PM EDT TUE AUG 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL MONROE COUNTY...

At 747 PM EDT, a severe thunderstorm was located over Greece, moving
east at 15 mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
Greece and Spencerport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4317 7780 4324 7782 4328 7771 4319 7767
TIME...MOT...LOC 2347Z 249DEG 12KT 4322 7775 

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

Church

221 
WWUS51 KBUF 012356
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
756 PM EDT TUE AUG 1 2017

NYC055-020005-
/O.EXP.KBUF.SV.W.0085.000000T0000Z-170802T0000Z/
Monroe NY-
756 PM EDT TUE AUG 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONROE COUNTY WILL
EXPIRE AT 800 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore the warning will 
be allowed to expire. Small hail and heavy rainfall is still 
expected over north central Monroe County as the storm moves out 
over Lake Ontario.

LAT...LON 4317 7780 4324 7782 4328 7771 4319 7767
TIME...MOT...LOC 2355Z 249DEG 12KT 4323 7772 

$$

Church

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 4:15 PM EDT	Special Marine Warning	BUF		60 min
Aug 1, 4:19 PM EDT	Special Weather Statement	BUF	Niagara	26 min
Aug 1, 5:34 PM EDT	Special Weather Statement	BUF	Orleans	41 min
Aug 1, 6:58 PM EDT	Special Weather Statement	BUF	Monroe	47 min
Aug 1, 7:53 PM EDT	Special Weather Statement	BUF	Monroe	37 min
Aug 1, 7:54 PM EDT	Special Marine Warning	BUF		66 min

Nearby

Severe Thunderstorm Warnings in New York, 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.