Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 118, NWS Albany, NY

July 20, 2021Hamilton County, Herkimer County, New York

NWS Albany, NY issued this severe thunderstorm warning at Jul 20, 2021, 6:52 PM EDT for Hamilton County, Herkimer County, New York. It was in force for 38 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: Jul 20, 2021, 6:52 PM EDT (22:52 UTC)
Expired: Jul 20, 2021, 7:30 PM EDT
In force: 38 min
Issued by: NWS Albany, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hamilton County, NY, Herkimer County, NY

The radar

The Ft Drum radar (KTYX), 77 km from the middle of the area, began a volume at 22:55 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
Jul 20, 6:52 PM EDT	TSTM WND DMG	8 Nnw Hoffmeister, NY	TREES ON ROAD, CREWS DISPATCHED.

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
Jul 20, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 10.9 hours before the alert went out and 118 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: 85 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

236 
WUUS51 KALY 202252
SVRALY
NYC041-043-202330-
/O.NEW.KALY.SV.W.0118.210720T2252Z-210720T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Albany NY
652 PM EDT Tue Jul 20 2021

The National Weather Service in Albany has issued a

* Severe Thunderstorm Warning for...
  Southwestern Hamilton County in eastern New York...
  East central Herkimer County in eastern New York...

* Until 730 PM EDT.

* At 652 PM EDT, a severe thunderstorm was located 12 miles north of
  Ohio, or 16 miles south of Old Forge, moving east at 20 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.

* Locations impacted include...
  Caswell Lake, Mountain Home, Hoffmeister, Atwell, West Canada Lakes
  and Herkimer Landing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes. Remember, lightning can strike out to 15 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now!

&&

Please report hail size...damaging winds and reports of trees down to
the National Weather Service by email at Alb.Stormreport@noaa.gov...
On Facebook at www.facebook.com/nwsalbany or twitter @nwsalbany

LAT...LON 4342 7499 4356 7498 4360 7451 4337 7459
TIME...MOT...LOC 2252Z 270DEG 15KT 4348 7489 

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

Rathbun

2 follow-up statements

183 
WWUS51 KALY 202320
SVSALY

Severe Weather Statement
National Weather Service Albany NY
720 PM EDT Tue Jul 20 2021

NYC041-043-202330-
/O.CON.KALY.SV.W.0118.000000T0000Z-210720T2330Z/
Hamilton NY-Herkimer NY-
720 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHWESTERN HAMILTON AND EAST CENTRAL HERKIMER COUNTIES...

At 720 PM EDT, a severe thunderstorm was located 10 miles west of
Moffitt Beach Campground, or 13 miles southwest of Speculator, moving
east at 15 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.

Locations impacted include...
Caswell Lake, Herkimer Landing, West Canada Lakes and Mountain Home. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4344 7485 4357 7485 4360 7451 4337 7459
TIME...MOT...LOC 2320Z 272DEG 11KT 4350 7462 

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

Rathbun

563 
WWUS51 KALY 202327
SVSALY

Severe Weather Statement
National Weather Service Albany NY
727 PM EDT Tue Jul 20 2021

NYC041-043-202336-
/O.EXP.KALY.SV.W.0118.000000T0000Z-210720T2330Z/
Hamilton NY-Herkimer NY-
727 PM EDT Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HAMILTON AND EAST
CENTRAL HERKIMER COUNTIES WILL EXPIRE AT 730 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.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
eastern New York.

LAT...LON 4344 7485 4357 7485 4360 7451 4337 7459
TIME...MOT...LOC 2326Z 270DEG 15KT 4350 7459 

$$

Rathbun

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:07 PM EDT	Areal Flood Advisory	ALY	Warren	113 min
Jul 20, 2:09 PM EDT	Special Weather Statement	ALY	Saratoga	36 min
Jul 20, 2:26 PM EDT	Severe Thunderstorm Warning	ALY	Saratoga, Washington	49 min
Jul 20, 2:56 PM EDT	Areal Flood Advisory	ALY	Saratoga, Washington	2 hr
Jul 20, 3:10 PM EDT	Special Weather Statement	ALY	Rensselaer	35 min
Jul 20, 3:51 PM EDT	Areal Flood Advisory	ALY	Saratoga, Warren, Washington	80 min
Jul 20, 3:58 PM EDT	Special Weather Statement	ALY	Washington	47 min
Jul 20, 6:28 PM EDT	Special Weather Statement	ALY	Hamilton	47 min
Jul 20, 6:46 PM EDT	Special Weather Statement	ALY	Hamilton, Herkimer	44 min
Jul 20, 7:02 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Hamilton, Herkimer	58 min
Jul 20, 7:25 PM EDT	Special Weather Statement	ALY	Warren	35 min
Jul 20, 7:34 PM EDT	Areal Flood Advisory	ALY	Fulton, Hamilton, Herkimer, Montgomery, Schenectady	3 hr
Jul 20, 7:34 PM EDT	Special Weather Statement	ALY	Warren	26 min
Jul 20, 7:41 PM EDT	Severe Thunderstorm Warning	ALY	Fulton, Hamilton, Herkimer, Montgomery, Saratoga, Warren	49 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every 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.