Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 927

May 10, 200317 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 8:59 PM EDT for 17 counties in North Carolina. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 10, 2003, 8:59 PM EDT (00:59 UTC)
Expired: May 10, 2003, 10:30 PM EDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Bertie County, NC, Camden County, NC, Chowan County, NC, Dare County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Martin County, NC, Nash County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Wilson County, NC

The radar

The Norfolk radar (KAKQ), 122 km from the middle of the area, began a volume at 00:59 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 00:00Z, 1.0 hours before the alert went out and 124 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: 1238 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1324 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

889 
ACUS11 KWNS 110100
SWOMCD
SPC MCD 110059 
NCZ000-VAZ000-110230-

MESOSCALE DISCUSSION 0927
NWS STORM PREDICTION CENTER NORMAN OK
0759 PM CDT SAT MAY 10 2003

AREAS AFFECTED...ERN NC

CONCERNING...TORNADO WATCH 345...

VALID 110059Z - 110230Z

TORNADO WATCH 345 CONTINUES IN EFFECT FOR PORTIONS OF ERN NC. THREAT
MAY BE EVOLVING TOWARD HEAVY RAINFALL...WITH RATES LOCALLY IN EXCESS
OF 2/HR.

AT 0045Z...A SERIES OF STRONG/SEVERE THUNDERSTORMS HAVE MERGED IN AN
E-W ORIENTED LINE FROM WRN NASH COUNTY EWD INTO MARTIN COUNTY. THE
ABSENCE OF A STRONG COLD POOL IN THE WAKE OF THIS CONVECTION IN
CONJUNCTION WITH LOW 70 DEWPOINTS...PRECIPITABLE WATER VALUES AROUND
1.75IN...A SURFACE BOUNDARY IN THE AREA...AND DEEP-LAYER SHEAR
LARGELY PARALLEL TO THE LINE SUGGESTS THE SEVERE THREAT MAY BE
DECEASING IN FAVOR OF LOCALLY HEAVY RAINFALL WITH TRAINING OF RADAR
ECHOES. THE LOCALLY HEAVY RAINFALL POTENTIAL IS EVOLVING FROM 10 N
RWI ESEWD ACROSS EDGECOMBE...MARTIN...AND NRN PITT COUNTIES IN ERN
NC. THREAT OF HEAVY RAIN MAY EXTEND ESEWD TO THE COAST THROUGH
11/05Z AS CLUSTER OF STORMS TRACK TOWARD PAMLICO SOUND OR
295/20-25KT.

..BANACOS.. 05/11/2003

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

ATTN...WFO...AKQ...MHX...RAH...

35477756 35597898 36347768 36577672 36187542 35597557

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 11, 6:55 AM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more	5 hr

Nearby

Mesoscale Discussions in North Carolina, 2003 Every mesoscale discussion in 2003

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.