Alert archive / North Carolina / Flash Flood Watches in 2009

Flash Flood Watch 1, NWS Raleigh, NC

June 4, 200920 counties in North Carolina

NWS Raleigh, NC issued this flash flood watch at Jun 4, 2009, 11:21 AM EDT for 20 counties in North Carolina. It took effect at Jun 4, 2009, 2:00 PM EDT. It was in force for 25 hr.

The area

The counties it named.

The facts

Issued: Jun 4, 2009, 11:21 AM EDT (15:21 UTC)
In effect from: Jun 4, 2009, 2:00 PM EDT
Expired: Jun 5, 2009, 3:29 PM EDT
In force: 25 hr
Issued by: NWS Raleigh, NC
Flood severity: None

Counties Alamance County, NC, Anson County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Stanly County, NC, Vance County, NC, Wake County, NC, Warren County, NC

The radar

The Raleigh/Durham radar (KRAX), 77 km from the middle of the area, began a volume at 15:22 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 12:00Z, 3.4 hours before the alert went out and 60 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: 349 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 891 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jun 4, 11:01 AM EDT, 20 minutes earlier.

Area forecast discussion, Jun 4, 11:01 AM EDT, 20 minutes before

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Hazardous weather outlook, Jun 4, 5:09 AM EDT, 6 hours 12 minutes before

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In the hours before

Local storm report, Jun 4, 9:43 AM EDT, 1 hour 38 minutes before

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Local storm report, Jun 4, 9:45 AM EDT, 1 hour 36 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 3:04 AM EDT	Areal Flood Advisory	RAH	Guilford	4 hr
Jun 4, 5:33 PM EDT	Areal Flood Advisory	RAH	Orange	3 hr
Jun 4, 5:34 PM EDT	Areal Flood Advisory	RAH	Davidson	3 hr
Jun 4, 6:57 PM EDT	Areal Flood Advisory	RAH	Forsyth, Guilford	3 hr

Nearby

Flash Flood Watches in North Carolina, 2009 Every flash flood watch in 2009

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.