Alert archive / North Carolina / Flash Flood Watches in 2008

Flash Flood Watch 5, NWS Raleigh, NC

December 10, 200831 counties in North Carolina

NWS Raleigh, NC issued this flash flood watch at Dec 10, 2008, 3:09 PM EST for 31 counties in North Carolina. It took effect at Dec 10, 2008, 6:00 PM EST. It was in force for 26 hr.

The area

The counties it named.

The facts

Issued: Dec 10, 2008, 3:09 PM EST (20:09 UTC)
In effect from: Dec 10, 2008, 6:00 PM EST
Expired: Dec 11, 2008, 8:07 PM EST
In force: 26 hr
Issued by: NWS Raleigh, NC
Flood severity: None

All 31 counties

Alamance County, NC, Anson County, NC, Chatham County, NC, Cumberland County, NC, Davidson County, NC, Durham County, NC, Edgecombe County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC

The radar

The Raleigh/Durham radar (KRAX), 45 km from the middle of the area, began a volume at 20:11 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, 8.2 hours before the alert went out and 217 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: 159 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Dec 10, 12:52 PM EST, 2 hours 17 minutes earlier.

Area forecast discussion, Dec 10, 12:52 PM EST, 2 hours 17 minutes before

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Hazardous weather outlook, Dec 10, 3:49 AM EST, 11 hours 20 minutes before

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In the hours before

Special weather statement, Dec 10, 2:08 PM EST, 1 hour 1 minute before

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Nearby

Flash Flood Watches in North Carolina, 2008 Every flash flood watch in 2008

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.