Alert archive / North Carolina / Dense Fog Advisories in 2012
Dense Fog Advisory 9, NWS Raleigh, NC
NWS Raleigh, NC issued this dense fog advisory at Mar 21, 2012, 6:00 AM EDT for 6 counties in North Carolina. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Mar 21, 2012, 6:00 AM EDT (10:00 UTC)
- Expired
- Mar 21, 2012, 9:51 AM EDT
- In force
- 4 hr
- Issued by
- NWS Raleigh, NC
Counties Alamance County, NC, Granville County, NC, Orange County, NC, Person County, NC, Vance County, NC, Warren County, NC
The radar
The Raleigh/Durham radar (KRAX), 71 km from the middle of the area, began a volume at 10:02 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
Roanoke, VA (KRNK), launched 00:00Z, 10.0 hours before the alert went out and 123 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
- 11 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 1517 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Raleigh, NC wrote its last area forecast discussion before this dense fog advisory went out at Mar 21, 3:30 AM EDT, 2 hours 30 minutes earlier.
Area forecast discussion, Mar 21, 3:30 AM EDT, 2 hours 30 minutes before
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</html>Hazardous weather outlook, Mar 21, 2:34 AM EDT, 3 hours 26 minutes before
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Special weather statement, Mar 21, 5:32 AM EDT, 28 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 532 AM EDT WED MAR 21 2012 NCZ007-021>025-038>040-073-074-083-211330- PERSON-FORSYTH-GUILFORD-ALAMANCE-ORANGE-DURHAM-DAVIDSON-RANDOLPH- CHATHAM-STANLY-MONTGOMERY-ANSON- INCLUDING THE CITIES OF...ROXBORO...WINSTON-SALEM...GREENSBORO... HIGH POINT...BURLINGTON...CHAPEL HILL...DURHAM...LEXINGTON... ASHEBORO...PITTSBORO...ALBEMARLE...TROY...WADESBORO 532 AM EDT WED MAR 21 2012 ...AREAS OF DENSE FOG EARLY THIS MORNING... MOTORISTS EARLY THIS MORNING ACROSS SECTIONS OF THE PIEDMONT WILL ENCOUNTER PATCHES OF DENSE FOG...REDUCING THE VISIBILITY TO NO MORE THAN A COUPLE HUNDRED FEET. DUE TO THE RANDOM NATURE OF THE DENSE FOG...MOTORISTS WILL NEED TO BE ALERT FOR RAPID CHANGES IN VISIBILITY AND TO REDUCE THEIR SPEED WHEN TRAVELING THROUGH THE FOGGY AREAS. THE FOG SHOULD LIFT AND DISSIPATE BETWEEN 9 AND 10 AM.
The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 8:55 PM EDT | Areal Flood Advisory | RAH | Randolph | 95 min |
| Mar 20, 11:05 PM EDT | Areal Flood Advisory | RAH | Chatham, Durham, Granville, Wake | 3 hr |
| Mar 21, 8:58 AM EDT | Areal Flood Advisory | RAH | Edgecombe, Johnston, Nash, Wilson | 109 min |
| Mar 21, 11:07 AM EDT | Special Weather Statement | RAH | Harnett, Lee, Moore | 53 min |
| Mar 21, 2:49 PM EDT | Special Weather Statement | RAH | Warren | 41 min |
| Mar 21, 4:24 PM EDT | Special Weather Statement | RAH | Wayne | 51 min |
| Mar 21, 4:57 PM EDT | Special Weather Statement | RAH | Wayne | 48 min |
| Mar 21, 5:47 PM EDT | Areal Flood Advisory | RAH | Wayne | 3 hr |
| Mar 21, 6:19 PM EDT | Special Weather Statement | RAH | Hoke, Richmond, Scotland | 56 min |
| Mar 21, 7:30 PM EDT | Special Weather Statement | RAH | Johnston | 60 min |
Nearby
Dense Fog Advisories in North Carolina, 2012Every dense fog advisory 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.