Alert archive / Vermont / Mesoscale Discussions in 2021
Mesoscale Discussion 1131
The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2021, 1:52 PM EDT for 4 states. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2021, 1:52 PM EDT (17:52 UTC)
- Expired
- Jun 30, 2021, 3:15 PM EDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 326...327
All 22 counties
Androscoggin County, ME, Cumberland County, ME, Oxford County, ME, Belknap County, NH, Carroll County, NH, Coos County, NH, Grafton County, NH, Merrimack County, NH, Sullivan County, NH, Fulton County, NY, Montgomery County, NY, Saratoga County, NY, Schenectady County, NY, Warren County, NY, Washington County, NY, Bennington County, VT, Caledonia County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT
The radar
The Burlington radar (KCXX), 103 km from the middle of the area, began a volume at 17:55 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, 5.9 hours before the alert went out and 146 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
- -257 J/kg
- Mixed-layer LCL
- 1162 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
505
ACUS11 KWNS 301752
SWOMCD
SPC MCD 301752
MEZ000-NHZ000-VTZ000-NYZ000-301915-
Mesoscale Discussion 1131
NWS Storm Prediction Center Norman OK
1252 PM CDT Wed Jun 30 2021
Areas affected...Portions of eastern NY into VT...NH...and southern
ME
Concerning...Severe Thunderstorm Watch 326...327...
Valid 301752Z - 301915Z
The severe weather threat for Severe Thunderstorm Watch 326, 327
continues.
SUMMARY...The greatest short-term threat for damaging wind gusts and
severe hail should focus across parts of eastern New York into
Vermont, New Hampshire, and southern Maine.
DISCUSSION...As of 1750Z, multiple supercells and short line
segments have developed across parts of central/eastern NY into VT.
Surface temperatures have mostly warmed into the upper 80s and low
90s, with dewpoints holding in the mid 60s to low 70s. Around
1500-2000 J/kg of MLCAPE has already developed across this region.
Enhanced westerly low to mid-level flow (30-40 kt at 700 mb and
45-50 kt at 500 mb) will remain over the Northeast this afternoon,
and 40-50 kt of effective bulk shear will be favorable for organized
severe storms. Current expectations are for ongoing storms to
continue posing a threat for both scattered damaging winds and
isolated severe hail. There appears to be some potential for storms
to gradually congeal into one or more small bowing clusters, with a
potentially greater damaging wind threat into parts of VT/NH and
southern ME later this afternoon.
..Gleason.. 06/30/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GYX...BTV...ALY...BGM...
LAT...LON 43087498 43817333 44527269 44747148 44697013 43837011
43337110 42787275 42817475 43087498SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 11:04 AM EDT | Mesoscale Discussion | SPC | Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 8 more | 116 min |
| Jun 30, 12:06 PM EDT | Severe Thunderstorm Watch | SPC | Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 9 more | 7 hr |
| Jun 30, 4:16 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Cumberland, Hancock, Kennebec, Knox, Lincoln and 4 more | 89 min |
| Jun 30, 11:47 AM EDT | Severe Thunderstorm Watch | SPC | Albany, Allegany, Broome, Cattaraugus, Cayuga, Chautauqua and 27 more | 7 hr |
| Jun 30, 2:16 PM EDT | Mesoscale Discussion | SPC | Albany, Columbia, Dutchess, Greene, Orange, Putnam and 2 more | 119 min |
| Jun 30, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | Columbia, Dutchess, Greene, Orange, Putnam, Rockland and 3 more | 7 hr |
| Jun 30, 4:48 PM EDT | Mesoscale Discussion | SPC | Albany, Columbia, Delaware, Greene, Schoharie, Sullivan and 1 more | 87 min |
| Jun 30, 6:58 PM EDT | Mesoscale Discussion | SPC | Bronx, Orange, Putnam, Rockland, Westchester | 92 min |
Nearby
Mesoscale Discussions in Vermont, 2021Mesoscale Discussions in New Hampshire, 2021Mesoscale Discussions in New York, 2021Every mesoscale discussion in 2021
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.