Alert archive / North Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Raleigh, NC

August 11, 2012Davidson County, North Carolina

NWS Raleigh, NC issued this special weather statement at Aug 11, 2012, 4:21 AM EDT for Davidson County, North Carolina. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 11, 2012, 4:21 AM EDT (08:21 UTC)
Expired: Aug 11, 2012, 4:45 AM EDT
In force: 24 min
Issued by: NWS Raleigh, NC

County Davidson County, NC

The radar

The Roanoke radar (KFCX), 116 km from the middle of the area, began a volume at 08:23 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 8.4 hours before the alert went out and 19 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: 781 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 955 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

286 
WWUS82 KRAH 110821
SPSRAH

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
421 AM EDT SAT AUG 11 2012

NCZ022-038-039-110845-
DAVIDSON-GUILFORD-RANDOLPH-
421 AM EDT SAT AUG 11 2012

...A STRONG THUNDERSTORM WILL MOVE ACROSS RANDOLPH...GUILFORD AND
DAVIDSON COUNTIES THROUGH 445 AM EDT...

AT 420 AM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
WELCOME...OR ABOUT OVER LEXINGTON...MOVING NORTHEAST AT 30 MPH.

SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...THOMASVILLE... 
TRINITY...ARCHDALE...AND HIGH POINT.

HAZARDS INCLUDE...
GUSTY WINDS UP TO 40 MPH.
DEADLY CLOUD TO GROUND LIGHTNING.
HEAVY RAINFALL AND PONDING OF WATER ON ROADWAYS.

THIS INCLUDES INTERSTATE 40 BETWEEN EXITS 208 AND 218...AND 
INTERSTATE 85 BETWEEN EXITS 94 AND 124.

WIND GUSTS UP TO 40 MPH ARE CAPABLE OF KNOCKING DOWN SMALL TREE 
LIMBS AND BLOWING AROUND TRASH CANS...POTTED PLANTS...LAWN FURNITURE 
AND OTHER LIGHT OUTDOOR OBJECTS. LOCALLY HEAVY RAINFALL WILL RESULT 
IN MINOR FLOODING AND PONDING OF WATER ON AREA ROADWAYS. MOTORISTS 
ARE URGED TO SLOW DOWN AND USE EXTRA CAUTION TO AVOID 
HYDROPLANING...ESPECIALLY ON INTERSTATE 40 AND INTERSTATE 85.

&&

LAT...LON 3603 8014 3601 8004 3608 8004 3618 7990
      3592 7974 3577 8024 3592 8036
TIME...MOT...LOC 0820Z 240DEG 28KT 3588 8019

$$

VINCENT

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 11:32 PM EDT	Special Weather Statement	RAH	Forsyth	43 min
Aug 11, 1:01 AM EDT	Special Weather Statement	RAH	Forsyth	59 min
Aug 11, 2:15 AM EDT	Special Weather Statement	RAH	Forsyth	30 min
Aug 11, 4:48 AM EDT	Special Weather Statement	RAH	Guilford	12 min
Aug 11, 5:35 AM EDT	Special Weather Statement	RAH	Person	40 min
Aug 11, 6:11 AM EDT	Special Weather Statement	RAH	Person	49 min
Aug 11, 6:44 AM EDT	Special Weather Statement	RAH	Vance	46 min
Aug 11, 12:03 PM EDT	Special Weather Statement	RAH	Wilson	57 min
Aug 11, 12:44 PM EDT	Special Weather Statement	RAH	Wayne	61 min
Aug 11, 12:59 PM EDT	Special Weather Statement	RAH	Franklin, Halifax, Warren	61 min
Aug 11, 1:05 PM EDT	Special Weather Statement	RAH	Alamance	55 min
Aug 11, 1:13 PM EDT	Tornado Warning	RAH	Halifax, Nash	25 min
Aug 11, 1:33 PM EDT	Special Weather Statement	RAH	Orange, Person	57 min
Aug 11, 1:59 PM EDT	Special Weather Statement	RAH	Granville, Orange	61 min
Aug 11, 2:08 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Vance	52 min
Aug 11, 2:26 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Granville, Orange, Person, Vance	50 min
Aug 11, 2:50 PM EDT	Special Weather Statement	RAH	Franklin, Warren	55 min
Aug 11, 3:19 PM EDT	Special Weather Statement	RAH	Alamance, Durham, Granville, Orange, Person, Vance	56 min
Aug 11, 3:29 PM EDT	Special Weather Statement	RAH	Sampson	61 min
Aug 11, 3:30 PM EDT	Flash Flood Warning	RAH	Davidson, Guilford, Randolph	3 hr
Aug 11, 3:42 PM EDT	Special Weather Statement	RAH	Franklin, Warren	63 min
Aug 11, 4:07 PM EDT	Areal Flood Advisory	RAH	Franklin, Halifax, Warren	3 hr
Aug 11, 4:07 PM EDT	Special Weather Statement	RAH	Edgecombe, Halifax, Johnston, Nash, Wayne, Wilson	83 min
Aug 11, 4:36 PM EDT	Areal Flood Advisory	RAH	Nash, Wayne, Wilson	3 hr
Aug 11, 4:36 PM EDT	Severe Thunderstorm Warning	RAH	Johnston, Wayne, Wilson	69 min
Aug 11, 5:13 PM EDT	Tornado Warning	RAH	Edgecombe, Wilson	62 min
Aug 11, 5:15 PM EDT	Areal Flood Advisory	RAH	Edgecombe, Halifax, Wilson	3 hr
Aug 11, 5:58 PM EDT	Special Weather Statement	RAH	Forsyth	32 min
Aug 11, 7:33 PM EDT	Flash Flood Warning	RAH	Davidson, Guilford, Randolph	3 hr

Nearby

Special Weather Statements in North Carolina, 2012 Every special weather statement in 2012

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.