Alert archive / Massachusetts / Special Weather Statements in 2011

Special Weather Statement, NWS Boston/Norton, MA

April 27, 2011Franklin County, Hampshire County, Massachusetts; Cheshire County, New Hampshire

NWS Boston/Norton, MA issued this special weather statement at Apr 27, 2011, 12:21 AM EDT for Franklin County, Hampshire County, Massachusetts; Cheshire County, New Hampshire. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 27, 2011, 12:21 AM EDT (04:21 UTC)
Expired: Apr 27, 2011, 1:15 AM EDT
In force: 54 min
Issued by: NWS Boston/Norton, MA

Counties Franklin County, MA, Hampshire County, MA, Cheshire County, NH

The radar

The Albany radar (KENX), 101 km from the middle of the area, began a volume at 04:21 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 00:00Z, 4.4 hours before the alert went out and 83 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: 168 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1821 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

777 
WWUS81 KBOX 270421
SPSBOX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1221 AM EDT WED APR 27 2011

MAZ002>004-008>011-NHZ011-015-270515-
CHESHIRE NH-EASTERN FRANKLIN MA-EASTERN HAMPDEN MA-EASTERN HAMPSHIRE
MA-NORTHERN WORCESTER MA-WESTERN AND CENTRAL HILLSBOROUGH NH-WESTERN
FRANKLIN MA-WESTERN HAMPDEN MA-WESTERN HAMPSHIRE MA-
1221 AM EDT WED APR 27 2011

AT 1217 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF THUNDERSTORMS PRODUCING FREQUENT LIGHTNING OVER SOUTHWEST 
VERMONT...THE BERKSHIRES AND ADJACENT EASTERN NEW YORK STATE... 
MOVING NORTHEAST AT 40 MPH. THESE STORMS WILL ENTER THE CONNECTICUT 
RIVER VALLEY AND THE INTERSTATE 91 CORRIDOR BETWEEN 1 AM AND 130 AM. 

FOR YOUR SAFETY...GET INSIDE WHEN THESE STORMS APPROACH. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. 

HEAVY RAIN MAY CAUSE MINOR STREET FLOODING AND PONDING OF WATER IN
LOW LYING AREAS SUCH AS UNDERPASSES. DO NOT DRIVE THROUGH FLOODED
ROADS.

&&

LAT...LON 4214 7308 4216 7303 4230 7301 4233 7307
      4239 7307 4240 7301 4263 7296 4268 7299
      4270 7296 4270 7302 4274 7303 4273 7247
      4276 7252 4288 7256 4301 7245 4309 7244
      4309 7187 4206 7288 4205 7306

$$

NOCERA

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 27, 1:16 AM EDT	Special Weather Statement	BOX	Franklin, Hampshire	59 min
Apr 27, 4:04 PM EDT	Small Craft Advisory	BOX		35 hr

Nearby

Special Weather Statements in Massachusetts, 2011 Special Weather Statements in New Hampshire, 2011 Every special weather statement 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.