Alert archive / Pennsylvania / Mesoscale Discussions in 2011

Mesoscale Discussion 593

April 26, 201128 counties in New York; 36 counties in Pennsylvania; 5 counties in Vermont

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 4:12 PM EDT for 28 counties in New York; 36 counties in Pennsylvania; 5 counties in Vermont. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2011, 4:12 PM EDT (20:12 UTC)
Expired: Apr 26, 2011, 5:15 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center

All 69 counties

Albany County, NY, Broome County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Warren County, NY, Washington County, NY, Bedford County, PA, Blair County, PA, Bradford County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lackawanna County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Westmoreland County, PA, Wyoming County, PA, Addison County, VT, Bennington County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Binghamton radar (KBGM), 34 km from the middle of the area, began a volume at 20:12 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 nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.2 hours before the alert went out and 156 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 497 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

020 
ACUS11 KWNS 262012
SWOMCD
SPC MCD 262012 
VTZ000-MAZ000-NYZ000-PAZ000-MDZ000-WVZ000-262115-

MESOSCALE DISCUSSION 0593
NWS STORM PREDICTION CENTER NORMAN OK
0312 PM CDT TUE APR 26 2011

AREAS AFFECTED...CNTRL NY...CNTRL/SWRN PA

CONCERNING...SEVERE THUNDERSTORM WATCH 213...

VALID 262012Z - 262115Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 213
CONTINUES.

AS OF 20Z...STRONG TO SEVERE TSTMS PERSISTED FROM NEAR SYR S/SWWD
INTO SWRN PA WITH RECENT REPORTS OF GOLF-BALL SIZED HAIL IN SYR AND
A MEASURED 53 KT GUST AT KJST. GIVEN STRONG MID-LEVEL SWLYS...AOA 50
KT AT 5 KM AGL IN THE BUF/PBZ/RLX VWP DATA...CLUSTERS WITH EMBEDDED
SUPERCELL STRUCTURES SHOULD PERSIST AND LIKELY PEAK WITHIN THE NEXT
COUPLE OF HOURS COINCIDENT WITH THE DIURNAL HEATING MAXIMUM. THE
SUPERCELL JUST E OF SYR APPEARS TO BE LOCATED ALONG THE W/E WARM
FRONTAL ZONE...WHICH COULD AID IN A LOCALIZED TORNADO THREAT.
OTHERWISE...DOWNSTREAM CU FIELD ALONG BOUNDARY /INVOF ALB/ APPEARS
TO HAVE RECENTLY FLATTENED AND MAY INDICATE ADDITIONAL TSTM
DEVELOPMENT IS UNLIKELY IN THE NEAR-TERM. NEVERTHELESS...WFO AREAL
EXTENSION OF WW 216 OR AN ADDITIONAL WW MAY BECOME NECESSARY IF
TSTMS MAINTAIN INTENSITY TO THE ERN EXTENT OF WW 216.

..GRAMS.. 04/26/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...BOX...BTV...ALY...PHI...BGM...BUF...CTP...LWX...
PBZ...

LAT...LON   43277622 44187478 44487360 44197291 43677253 43137259
            42687286 41577506 39677767 39688058 40268020 41337877
            43277622

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 1:18 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chemung, Chenango and 14 more	57 min
Apr 26, 1:49 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Cattaraugus, Cayuga, Chemung, Chenango and 26 more	7 hr
Apr 26, 6:51 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Cayuga, Chemung, Chenango, Cortland and 21 more	54 min

Nearby

Mesoscale Discussions in Pennsylvania, 2011 Mesoscale Discussions in New York, 2011 Mesoscale Discussions in Vermont, 2011 Every 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.