Alert archive / New Hampshire / Mesoscale Discussions in 2011
Mesoscale Discussion 1747
The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2011, 1:34 PM EDT for 6 states. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Jul 26, 2011, 1:34 PM EDT (17:34 UTC)
- Expired
- Jul 26, 2011, 3:00 PM EDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 27 counties
Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Oxford County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Bergen County, NJ, Passaic County, NJ, Dutchess County, NY, Orange County, NY, Putnam County, NY, Rockland County, NY, Westchester County, NY, Providence County, RI
The radar
The Boston radar (KBOX), 122 km from the middle of the area, began a volume at 17:36 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, 5.6 hours before the alert went out and 145 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
- 72 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 611 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 11:05 AM EDT | Mesoscale Discussion | SPC | 55 min | |
| Jul 26, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | Northwest Hills Planning Region | 8 hr |
| Jul 26, 2:30 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Northeastern Connecticut Planning Region | 8 hr |
| Jul 26, 6:17 PM EDT | Mesoscale Discussion | SPC | 58 min | |
| Jul 26, 3:39 PM EDT | Mesoscale Discussion | SPC | Berkshire | 66 min |
| Jul 26, 5:24 PM EDT | Mesoscale Discussion | SPC | Bergen, Burlington, Essex, Hudson, Hunterdon, Mercer and 8 more | 66 min |
Nearby
Mesoscale Discussions in New Hampshire, 2011Mesoscale Discussions in Connecticut, 2011Mesoscale Discussions in Massachusetts, 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.