Alert archive / New York / Mesoscale Discussions in 2012
Mesoscale Discussion 1934
The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2012, 2:46 PM EDT for Berkshire County, Massachusetts; 20 counties in New York; 9 counties in Vermont. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Sep 8, 2012, 2:46 PM EDT (18:46 UTC)
- Expired
- Sep 8, 2012, 3:45 PM EDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 30 counties
Berkshire County, MA, Albany County, NY, Clinton County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Montgomery County, NY, Orange County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Chittenden County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT
The radar
The Albany radar (KENX), 58 km from the middle of the area, began a volume at 18:48 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 6.8 hours before the alert went out and 44 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
- 113 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 294 m²/s²
- 0-3 km storm-relative helicity
- 397 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
322
ACUS11 KWNS 081847
SWOMCD
SPC MCD 081846
VTZ000-MAZ000-CTZ000-NYZ000-PAZ000-081945-
MESOSCALE DISCUSSION 1934
NWS STORM PREDICTION CENTER NORMAN OK
0146 PM CDT SAT SEP 08 2012
AREAS AFFECTED...ERN NY...VT
CONCERNING...TORNADO WATCH 637...
VALID 081846Z - 081945Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 637 CONTINUES.
SUMMARY...DAMAGING WIND AND ISOLATED TORNADO THREAT WILL LIKELY
INCREASE IN THE NEXT FEW HOURS AS COLD FRONT IS ABOUT TO MERGE WITH
PRE-FRONTAL QLCS IN CNTRL NY. THIS THREAT SHOULD BE MAXIMIZED ACROSS
THE HUDSON/CHAMPLAIN VALLEYS AROUND 21Z.
DISCUSSION...SURFACE COLD FRONT EXTENDED FROM SAINT LAWRENCE COUNTY
NY TO COLUMBIA COUNTY PA AS OF 1835Z. THIS IS JUST ABOUT TO OVERTAKE
THE PRE-FRONTAL QLCS. AS THIS PROCESS ENSUES AND WITH DOWNSTREAM
SURFACE TEMPERATURES IN THE UPPER 70S TO LOWER 80S...THE LINE SHOULD
INTENSIFY ACROSS ERN NY/NERN PA. WITH MODIFIED 18Z ALB RAOB SAMPLING
MLCAPE AROUND 1000 J/KG AMIDST EFFECTIVE SRH AROUND 200 M2/S2...THIS
SETUP WILL FAVOR EMBEDDED BOWING/LEWP STRUCTURES PRODUCING
POTENTIALLY NUMEROUS AND SIGNIFICANT WIND DAMAGE ALONG WITH BRIEF
TORNADOES.
..GRAMS.. 09/08/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BOX...BTV...OKX...ALY...BGM...
LAT...LON 44097451 44727399 44937307 44757238 44307229 43387259
42007335 41537378 41377422 41477483 41617519 41827543
44097451SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 10:39 AM EDT | Mesoscale Discussion | SPC | Berkshire, Franklin, Hampden, Hampshire | 2 hr |
| Sep 8, 11:18 AM EDT | Tornado Watch | SPC | Hampden, Hampshire | 10 hr |
| Sep 8, 12:40 PM EDT | Tornado Watch | SPC | Berkshire | 7 hr |
| Sep 8, 1:30 PM EDT | Mesoscale Discussion | SPC | Berkshire, Hampden, Hampshire | 60 min |
| Sep 8, 3:55 PM EDT | Mesoscale Discussion | SPC | Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire and 4 more | 65 min |
| Sep 8, 4:47 PM EDT | Severe Thunderstorm Watch | SPC | Barnstable, Bristol, Dukes, Essex, Franklin, Hampden and 7 more | 6 hr |
| Sep 8, 6:17 PM EDT | Mesoscale Discussion | SPC | Berkshire, Franklin | 58 min |
| Sep 8, 7:53 PM EDT | Mesoscale Discussion | SPC | Bristol, Dukes, Essex, Middlesex, Norfolk, Plymouth and 2 more | 97 min |
| Sep 8, 12:57 AM EDT | Mesoscale Discussion | SPC | Chautauqua | 2 hr |
| Sep 8, 8:42 AM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Chenango, Cortland, Herkimer and 13 more | 93 min |
| Sep 8, 10:03 AM EDT | Severe Thunderstorm Watch | SPC | Allegany, Cattaraugus, Cayuga, Chemung, Franklin, Genesee and 16 more | 5 hr |
| Sep 8, 11:38 AM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chemung, Chenango, Cortland, Delaware and 18 more | 97 min |
| Sep 8, 2:12 PM EDT | Mesoscale Discussion | SPC | Richmond | 93 min |
| Sep 8, 4:22 PM EDT | Mesoscale Discussion | SPC | Richmond | 53 min |
Nearby
Mesoscale Discussions in New York, 2012Mesoscale Discussions in Vermont, 2012Mesoscale Discussions in Massachusetts, 2012Every mesoscale discussion in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.