Alert archive / New Hampshire / Mesoscale Discussions in 2011

Mesoscale Discussion 90

February 5, 2011Franklin County, Massachusetts; 8 counties in New Hampshire; 5 counties in Vermont

The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2011, 9:02 PM EST for Franklin County, Massachusetts; 8 counties in New Hampshire; 5 counties in Vermont. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Feb 5, 2011, 9:02 PM EST (02:02 UTC)
Expired: Feb 5, 2011, 11:00 PM EST
In force: 118 min
Issued by: the Storm Prediction Center

Counties Franklin County, MA, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Caledonia County, VT, Orange 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 02:05 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 00:00Z, 2.0 hours before the alert went out and 144 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 458 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 497 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

119 
ACUS11 KWNS 060203
SWOMCD
SPC MCD 060202
MEZ000-NHZ000-MAZ000-VTZ000-060400-

MESOSCALE DISCUSSION 0090
NWS STORM PREDICTION CENTER NORMAN OK
0802 PM CST SAT FEB 05 2011

AREAS AFFECTED...CNTRL MA / MUCH OF VT AND NH / WRN MAINE

CONCERNING...FREEZING RAIN

VALID 060202Z - 060400Z

A BAND OF TSTMS WILL MOVE ACROSS PORTIONS OF NEW ENGLAND DURING THE
NEXT FEW HOURS.  A QUICK BURST OF FREEZING RAIN WILL RESULT WITH
LOCALIZED RATES EXCEEDING 0.15 INCH PER HOUR.

LATEST SURFACE ANALYSIS PLACES A LOW INVOF THE HUDSON VALLEY AND
TEMPS ACROSS VT/NH ARE HOLDING IN THE UPPER 20S TO LOWER 30S DEG F.
A STRONG NEGATIVELY TILTED UPPER TROUGH MOVING INTO NEW ENGLAND THIS
EVENING IS RESULTING IN VIGOROUS LARGE SCALE ASCENT MOVING INTO THE
REGION.  THIS...ALONG WITH AN IMPROVING THERMODYNAMIC STRATIFICATION
PER THE 00Z ALB RAOB --SHOWING A PRONOUNCED WARM LAYER NEAR 825 MB
AROUND 5 DEG C WITH STEEP MID LEVEL LAPSE RATES /7 DEG C PER
KM/--HAS BEEN AND WILL LIKELY CONTINUE TO SUPPORT UPRIGHT CONVECTION
DURING THE NEXT FEW HOURS.  WITH A SHALLOW SUBFREEZING WEDGE OF AIR
IN PLACE ACROSS THE REGION...FREEZING RAIN WILL BE THE FAVORED
P-TYPE AND RAINFALL RATES MAY LOCALLY EXCEED 0.15 PER HOUR.

..SMITH.. 02/06/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...GYX...BOX...BTV...ALY...

LAT...LON   44317290 44667243 44707139 44437057 43877073 42467202
            42347247 42767295 44317290

Nearby

Mesoscale Discussions in New Hampshire, 2011 Mesoscale Discussions in Vermont, 2011 Mesoscale Discussions in Massachusetts, 2011 Every 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.