Alert archive / Maine / Mesoscale Discussions in 2007
Mesoscale Discussion 4
The Storm Prediction Center issued this mesoscale discussion at Jan 1, 2007, 7:43 AM EST for 8 counties in Maine. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 1, 2007, 7:43 AM EST (12:43 UTC)
- Expired
- Jan 1, 2007, 1:45 PM EST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Androscoggin County, ME, Franklin County, ME, Kennebec County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Somerset County, ME, Waldo County, ME
The radar
The Portland,ME radar (KGYX), 143 km from the middle of the area, began a volume at 12:43 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 12:00Z, 0.7 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 542 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 303 m²/s²
- 0-3 km storm-relative helicity
- 488 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 011243 SWOMCD SPC MCD 011243 MEZ000-NHZ000-011845- MESOSCALE DISCUSSION 0004 NWS STORM PREDICTION CENTER NORMAN OK 0643 AM CST MON JAN 01 2007 AREAS AFFECTED...ERN NH AND ME CONCERNING...FREEZING RAIN VALID 011243Z - 011845Z FREEZING RAIN...MIXED AT TIMES WITH SLEET...WILL CONTINUE THIS MORNING. HOURLY RATES OF UP TO .05-.07 WILL BE POSSIBLE WITH PRECIPITATION ENDING FROM WEST TO EAST ACROSS REGION. INTENSE...SHORT WAVE TROUGH WAS LIFTING NEWD THROUGH THE LOWER GREAT LAKES THIS MORNING WITH ASSOCIATED...DOWNSTREAM WARM CONVEYOR BELT SUPPORTING LARGE PRECIPITATION SHIELD FROM THE DELMARVA NEWD THROUGH THE LOWER HUDSON VALLEY AND MUCH OF NEW ENGLAND. INDEED...REGIONAL VWPS INDICATE STRONG LLJ OF 50-60 KTS WHICH IS DRIVING INTENSE WAA REGIME THROUGH THE LOWER HUDSON VALLEY INTO CNTRL/NRN NEW ENGLAND. THIS WAA ATOP SUB-FREEZING SURFACE TEMPERATURES HAS RESULTED IN A FAIRLY WIDESPREAD AREA OF FREEZING RAIN EARLY THIS MORNING WITH EARLIER OBSERVATIONS FROM INTERIOR MA NWD INTO PORTIONS OF VT/NH INDICATING RATES OF .05-.07/HR. EXPECT SIMILAR TRENDS TO CONTINUE THROUGH THE REMAINDER OF THE MORNING FROM PORTIONS OF E-CNTRL/NRN NH INTO ME. PRECIPITATION MAY CHANGE TO RAIN /NAMELY ACROSS CNTRL AND SRN NH/...PRIOR TO DIMINISHING FROM WEST TO EAST ACROSS REGION AS SYSTEM DRY SLOT SHIFTS EWD. BASED ON 12Z GYX SOUNDING...INTENSE VERTICAL MOTION ASSOCIATED WITH THE LOW-LEVEL WAA REGIME MAY OFFSET LAYER WARMING AND SUFFICIENTLY COOL 850-700MB WARM NOSE TO SUPPORT A MIX OF SLEET AND FREEZING RAIN...ESPECIALLY ACROSS PORTIONS OF ME. ..MEAD.. 01/01/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ...NOTICE... SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS. ATTN...WFO...CAR...GYX... 44297134 44957118 46086997 46716903 46606860 46066817 45186812 44606845 43977000 43697099
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 2:00 AM EST | Mesoscale Discussion | SPC | Androscoggin, Cumberland, Franklin, Oxford, Sagadahoc, York | 5 hr |
Nearby
Mesoscale Discussions in Maine, 2007Every mesoscale discussion in 2007
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.