Alert archive / New York / Mesoscale Discussions in 2011
Mesoscale Discussion 979
The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 11:55 AM EDT for 21 counties in New York; 19 counties in Pennsylvania. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2011, 11:55 AM EDT (15:55 UTC)
- Expired
- May 26, 2011, 1:30 PM EDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 40 counties
Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Otsego County, NY, Schoharie County, NY, Schuyler County, NY, Seneca County, NY, Tioga County, NY, Tompkins County, NY, Warren County, NY, Bradford County, PA, Clinton County, PA, Columbia County, PA, Dauphin County, PA, Juniata County, PA, Lackawanna County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA
The radar
The Binghamton radar (KBGM), 22 km from the middle of the area, began a volume at 15:59 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, 3.9 hours before the alert went out and 199 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
- 1004 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 274 m²/s²
- 0-3 km storm-relative helicity
- 327 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
376
ACUS11 KWNS 261555
SWOMCD
SPC MCD 261555
NYZ000-PAZ000-261730-
MESOSCALE DISCUSSION 0979
NWS STORM PREDICTION CENTER NORMAN OK
1055 AM CDT THU MAY 26 2011
AREAS AFFECTED...CNTRL PA INTO UPSTATE NY
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 261555Z - 261730Z
STRONG BOUNDARY LAYER HEATING IS OCCURRING OVER MUCH OF PA AND NY
WELL AHEAD OF PRIMARY FORCING ASSOCIATED WITH UPPER TROUGH OVER THE
OH VALLEY. IN THE ABSENCE OF SIGNIFICANT CLOUD COVER IT APPEARS
VERY STEEP LOW LEVEL LAPSE RATES WILL SOON CONTRIBUTE TO DEEP
BOUNDARY LAYER THERMALS AND WITH TIME A MATURING CU FIELD THAT
SHOULD LEAD TO SCATTERED THUNDERSTORM DEVELOPMENT...ESPECIALLY OVER
THE HIGHER TERRAIN FROM CNTRL PA INTO UPSTATE NY.
ADDITIONALLY...DEEP LAYER SHEAR PROFILES FAVOR SUPERCELL DEVELOPMENT
AND LOW LEVEL MOISTURE IS SUCH THAT ISOLATED TORNADOES MAY ACCOMPANY
THE MORE ORGANIZED CELLS. VERY LARGE HAIL MAY ALSO BE NOTED GIVEN
THE INSTABILITY OBSERVED. THIS ENVIRONMENT IS BECOMING INCREASINGLY
FAVORABLE FOR SEVERE DEVELOPMENT AND A TORNADO WATCH MAY BE ISSUED
BY 18Z.
..DARROW.. 05/26/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BTV...ALY...PHI...BGM...BUF...CTP...
LAT...LON 40527795 43007688 44437458 43577343 41727518 40327654
40527795SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 12:29 PM EDT | Tornado Watch | SPC | Clinton, Essex, Franklin, St. Lawrence | 8 hr |
| May 26, 2:16 PM EDT | Tornado Watch | SPC | Albany, Broome, Cayuga, Chemung, Chenango, Cortland and 26 more | 8 hr |
| May 26, 2:57 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chemung, Chenango, Clinton, Cortland and 20 more | 63 min |
| May 26, 5:49 PM EDT | Mesoscale Discussion | SPC | Sullivan | 56 min |
| May 26, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Livingston, Ontario and 1 more | 6 hr |
| May 26, 6:41 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chenango, Cortland, Delaware, Essex and 16 more | 64 min |
| May 25, 8:14 PM EDT | Mesoscale Discussion | SPC | Crawford, Lawrence, Mercer | 2 hr |
| May 26, 2:37 AM EDT | Mesoscale Discussion | SPC | Beaver, Lawrence | 83 min |
| May 26, 2:53 PM EDT | Tornado Watch | SPC | Adams, Bedford, Blair, Centre, Clinton, Columbia and 20 more | 7 hr |
Nearby
Mesoscale Discussions in New York, 2011Mesoscale Discussions in Pennsylvania, 2011Every mesoscale discussion in 2011
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.