Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 43

January 22, 2011Carteret County, Dare County, Hyde County, North Carolina

The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2011, 5:28 PM EST for Carteret County, Dare County, Hyde County, North Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jan 22, 2011, 5:28 PM EST (22:28 UTC)
Expired
Jan 22, 2011, 7:30 PM EST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Carteret County, NC, Dare County, NC, Hyde County, NC

The radar

The Morehead City radar (KMHX), 110 km from the middle of the area, began a volume at 22:30 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

Newport, NC (KMHX), launched 12:00Z, 10.5 hours before the alert went out and 110 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-pSkew-T log-p diagram, Newport, NC at 12:00Z on 2011-01-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 12:00Z on 2011-01-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
856 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
276 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.

396 
ACUS11 KWNS 222228
SWOMCD
SPC MCD 222228 
NCZ000-230030-

MESOSCALE DISCUSSION 0043
NWS STORM PREDICTION CENTER NORMAN OK
0428 PM CST SAT JAN 22 2011

AREAS AFFECTED...OUTER BANKS OF ERN NC

CONCERNING...HEAVY SNOW 

VALID 222228Z - 230030Z

BANDS OF HEAVY SNOW WITH OBSERVED RATES FROM 1 TO 2 IN/HR ALONG THE
OUTER BANKS WILL DIMINISH QUICKLY/SHIFT OFFSHORE JUST AFTER 00Z.

SNOWFALL RATES OF 1 TO 2 IN/HR HAVE BEEN REPORTED ACROSS ERN NC
WITHIN BANDS OF HEAVY SNOW GRADUALLY SHIFTING EWD /PER RECENT RADAR
IMAGERY/. THESE SNOW BANDS WERE IN ASSOCIATION WITH A VIGOROUS SHORT
WAVE TROUGH NOW JUST OFF THE CAROLINA COAST. STRONG UVV COINCIDENT
WITH THE DENDRITIC GROWTH ZONE /CENTERED AROUND 600 MB PER LATEST
NAM AND RUC FORECAST SOUNDINGS/ WILL REMAIN SUPPORTIVE OF INTENSE
SNOWFALL RATES. AS THE SHORT WAVE TROUGH SHIFTS FARTHER
OFFSHORE...HEAVY SNOW SHOULD RAPIDLY END OVER LAND BETWEEN 00-01Z
/PER LATEST HRRR AND SREF GUIDANCE/.

..GRAMS.. 01/22/2011

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

ATTN...WFO...MHX...

LAT...LON   35887507 35137549 34497648 34597692 35227652 36157564
            35887507

Nearby

Mesoscale Discussions in North Carolina, 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.