Alert archive / Maine / Mesoscale Discussions in 2016

Mesoscale Discussion 147

February 24, 20164 counties in Maine

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2016, 2:11 PM EST for 4 counties in Maine. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Feb 24, 2016, 2:11 PM EST (19:11 UTC)
Expired: Feb 24, 2016, 6:15 PM EST
In force: 4 hr
Issued by: the Storm Prediction Center

Counties Franklin County, ME, Penobscot County, ME, Piscataquis County, ME, Somerset County, ME

The radar

The Caribou radar (KCBW), 142 km from the middle of the area, began a volume at 19:10 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

Caribou, ME (KCAR), launched 12:00Z, 7.2 hours before the alert went out and 181 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: 1039 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 388 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

180 
ACUS11 KWNS 241911
SWOMCD
SPC MCD 241911 
MEZ000-NHZ000-242315-

MESOSCALE DISCUSSION 0147
NWS STORM PREDICTION CENTER NORMAN OK
0111 PM CST WED FEB 24 2016

AREAS AFFECTED...PORTIONS OF MAINE AND NRN NH

CONCERNING...FREEZING RAIN 

VALID 241911Z - 242315Z

SUMMARY...AREAS OF FREEZING RAIN WILL SPREAD ACROSS PORTIONS OF NRN
NEW ENGLAND THROUGH LATE THIS AFTERNOON.

DISCUSSION...THE ERN PERIPHERY OF A BROAD WARM-ADVECTION PLUME --
LOCATED WELL E OF A DEEP CYCLONE CROSSING PARTS OF THE OHIO 
VALLEY -- IS SUPPORTING AREAS OF PRECIP ACROSS NEW ENGLAND. ONE AREA
OF PRECIP IS ADVANCING ENEWD ACROSS PARTS OF CNTRL/NRN MAINE...WITH
A MORE WIDESPREAD SHIELD OF PRECIP DEVELOPING NWD/NEWD FROM NY AND
SRN NEW ENGLAND. MEANWHILE...THE SFC-PRESSURE PATTERN IMPLIES
RESIDUAL COLD-AIR-DAMMING IN MANY LOCATIONS NEAR/E OF THE
APPALACHIANS WITHIN THE MCD AREA...ASSOCIATED WITH SUB-FREEZING SFC
TEMPERATURES ACROSS THE REGION. GIVEN ONLY MODEST LOW-LEVEL
MASS-FIELD ADJUSTMENTS -- OWING TO STRONGER FORCING FOR ASCENT
DISPLACED WELL TO THE W OF THE AREA -- SUB-FREEZING SFC TEMPERATURES
SHOULD CONTINUE THROUGH THE AFTERNOON. THE COLDEST READINGS WILL BE
LIKELY IN SHELTERED VALLEYS AND OTHER LOWER ELEVATIONS. FORECAST
SOUNDINGS SUGGEST THAT AN ELEVATED WARM LAYER WILL CONTINUE TO
FOSTER MELTING OF DESCENDING HYDROMETEORS THAT WILL FREEZE ON
CONTACT WITH THE SFC LAYER AS FREEZING RAIN. FREEZING-RAIN RATES OF
0.02 TO LOCALLY 0.05 INCH PER HOUR WILL BE POSSIBLE AS PRECIP
ADVANCES ACROSS THE REGION THROUGH LATE AFTERNOON.

..COHEN.. 02/24/2016

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

ATTN...WFO...CAR...GYX...

LAT...LON   46336779 45366810 44486981 44557125 45087142 45377099
            45957019 46366950 46586863 46336779

Nearby

Mesoscale Discussions in Maine, 2016 Every mesoscale discussion in 2016

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.