Alert archive / New York / Mesoscale Discussions in 2013
Mesoscale Discussion 1875
The Storm Prediction Center issued this mesoscale discussion at Sep 11, 2013, 6:54 PM EDT for 5 states. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Sep 11, 2013, 6:54 PM EDT (22:54 UTC)
- Expired
- Sep 11, 2013, 8:30 PM EDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 53 counties
Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Androscoggin County, ME, Aroostook County, ME, Franklin County, ME, Kennebec County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Somerset County, ME, Waldo County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Albany County, NY, Clinton County, NY, Columbia County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Montgomery County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, St. Lawrence County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT
The radar
The Burlington radar (KCXX), 123 km from the middle of the area, began a volume at 22:54 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
Gray, ME (KGYX), launched 12:00Z, 10.9 hours before the alert went out and 127 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
- 1310 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 970 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
311
ACUS11 KWNS 112255
SWOMCD
SPC MCD 112254
MEZ000-NHZ000-MAZ000-VTZ000-NYZ000-120030-
MESOSCALE DISCUSSION 1875
NWS STORM PREDICTION CENTER NORMAN OK
0554 PM CDT WED SEP 11 2013
AREAS AFFECTED...ERN NY...WRN MA...VT/NH...MUCH OF ME
CONCERNING...SEVERE THUNDERSTORM WATCH 521...
VALID 112254Z - 120030Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 521
CONTINUES.
SUMMARY...THUNDERSTORM CLUSTERS OVER NRN VT/NH AND ME WILL POSE AN
ISOLATED SEVERE WEATHER THREAT THIS EVENING. DAMAGING WINDS AND
ISOLATED LARGE HAIL WILL ALSO BE POSSIBLE WITH STORMS FORMING ALONG
SURGING COLD POOL LOCATED OVER ERN NY. THIS ACTIVITY WILL ENTER WRN
MA AND SRN VT/NH DURING THE NEXT 1-2 HOURS.
DISCUSSION...AT 2245Z...SURFACE HEAT AXIS...WHERE TEMPERATURES
RESIDE IN THE 80S TO LOW 90S...WAS POSITIONED FROM ERN PA NEWD INTO
CNTRL ME. THOUGH TEMPERATURES ARE GRADUALLY COOLING ALONG THIS
AXIS...A VERY MOIST BOUNDARY LAYER WITH SURFACE DEWPOINTS IN THE LOW
70S CONTINUES TO SUPPORT MLCAPE VALUES IN EXCESS OF 2500 J/KG.
ELONGATED COLD POOL IS SURGING ENEWD AT 30 KT ALONG THE NRN EDGE OF
THE INSTABILITY AXIS. GIVEN THE PRESENCE OF DEEP-LAYER WSWLY SHEAR
NEAR 30 KT...SEMI-ORGANIZED DAMAGING WIND THREAT WILL BE POSSIBLE
ALONG THE LEADING EDGE OF THE COLD POOL AS IT MOVES FROM ERN NY INTO
SRN VT/NH AND WRN MA DURING THE NEXT 1-2 HOURS. FARTHER
NE...WEAKENING 0-3 KM LAPSE RATES FROM NRN VT/NH INTO ME SUGGESTS
THE BOUNDARY LAYER IS STABILIZING. THUS...THE SEVERE WEATHER THREAT
IS EXPECTED TO BE MORE ISOLATED WITH ONGOING STORM CLUSTERS AND ANY
ADDITIONAL REDEVELOPMENT ALONG A COLD FRONT MOVING SSEWD INTO THE
AREA.
..GARNER.. 09/11/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CAR...GYX...BOX...BTV...OKX...ALY...BGM...BUF...
LAT...LON 45017479 44987421 45027152 45297129 45267086 45937026
46247026 46447004 46706998 47466923 47436904 47236904
47186887 47356826 47086779 45696780 45626807 45276795
45236830 44956848 44766845 44676883 44236900 44366929
44276964 43927010 44107074 42907144 42737127 42747226
42037212 42067390 41597395 41597437 41997474 42177441
42327442 42487470 42827465 42907485 42857520 43197510
44097516 44377583 44517574 44857525 45017479SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 1:30 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Cumberland, Franklin, Kennebec, Oxford, Penobscot and 3 more | 60 min |
| Sep 11, 2:33 PM EDT | Severe Thunderstorm Watch | SPC | Androscoggin, Aroostook, Cumberland, Franklin, Kennebec, Knox and 8 more | 9 hr |
| Sep 11, 11:42 AM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 20 more | 63 min |
| Sep 11, 12:33 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 22 more | 8 hr |
| Sep 11, 2:47 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 16 more | 58 min |
Nearby
Mesoscale Discussions in New York, 2013Mesoscale Discussions in Vermont, 2013Mesoscale Discussions in Maine, 2013Every mesoscale discussion in 2013
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.