Alert archive / Vermont / Mesoscale Discussions in 2011
Mesoscale Discussion 1007
The Storm Prediction Center issued this mesoscale discussion at May 28, 2011, 5:37 PM EDT for Clinton County, Essex County, New York; 12 counties in Vermont. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2011, 5:37 PM EDT (21:37 UTC)
- Expired
- May 28, 2011, 6:30 PM EDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
Counties Clinton County, NY, Essex County, NY, Addison 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, Windsor County, VT
The radar
The Burlington radar (KCXX), 22 km from the middle of the area, began a volume at 21:40 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, 9.6 hours before the alert went out and 189 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
- 167 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 742 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
856
ACUS11 KWNS 282137
SWOMCD
SPC MCD 282137
NHZ000-VTZ000-NYZ000-282230-
MESOSCALE DISCUSSION 1007
NWS STORM PREDICTION CENTER NORMAN OK
0437 PM CDT SAT MAY 28 2011
AREAS AFFECTED...PORTIONS OF UPSTATE NEW YORK INTO VT
CONCERNING...SEVERE THUNDERSTORM WATCH 391...
VALID 282137Z - 282230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 391
CONTINUES.
OCCASIONAL STRONG TO SEVERE STORMS CAPABLE OF DMGG WINDS AND LARGE
HAIL REMAIN POSSIBLE OVER THE WW AREA.
A WEAK MID LEVEL IMPULSE OBSERVED ON WV IMAGERY OVER UPSTATE NY AND
NWRN NEW ENGLAND AS OF 2130Z HAS PROVIDED SUFFICIENT UPPER FORCING
FOR CONVECTION TO DEVELOP ACROSS THE WW AREA. AS THIS WAVE QUICKLY
MOVES THROUGH...IMPLIED SUBSIDENCE IN ITS WAKE IN COMBINATION WITH
DIURNAL COOLING MAY ACT TO WEAKEN ONGOING CONVECTION. IN THE MEAN
TIME...WEAK INSTABILITY AND MODEST MID LEVEL LAPSE RATES /6.5 C/KM
PER RUC ANALYSIS/ JUXTAPOSED WITH EFFECTIVE SHEAR OF 30-40 KTS
SHOULD BE SUPPORTIVE OF LOOSELY ORGANIZED STORMS CAPABLE OF DMGG
WINDS AND LARGE HAIL.
..HURLBUT.. 05/28/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GYX...BTV...ALY...
LAT...LON 44987391 45027157 44427170 43207249 43357327 43907422
44667402 44987391SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 1:42 PM EDT | Mesoscale Discussion | SPC | Clinton, Essex, Saratoga, Warren, Washington | 63 min |
| May 28, 1:45 PM EDT | Severe Thunderstorm Watch | SPC | Clinton, Essex | 5 hr |
Nearby
Mesoscale Discussions in Vermont, 2011Mesoscale Discussions in New York, 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.