Alert archive / Georgia / Flash Flood Watches in 2010

Flash Flood Watch 1, NWS Atlanta, GA

May 2, 201060 counties in Georgia

NWS Atlanta, GA issued this flash flood watch at May 2, 2010, 4:15 AM EDT for 60 counties in Georgia. It took effect at May 2, 2010, 8:00 PM EDT. It was in force for 19 hr.

The area

The counties it named.

The facts

Issued: May 2, 2010, 4:15 AM EDT (08:15 UTC)
In effect from: May 2, 2010, 8:00 PM EDT
Expired: May 3, 2010, 3:22 PM EDT
In force: 19 hr
Issued by: NWS Atlanta, GA
Flood severity: None

All 60 counties

Banks County, GA, Barrow County, GA, Bartow County, GA, Butts County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Lamar County, GA, Lumpkin County, GA, Madison County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Talbot County, GA, Taliaferro County, GA, Towns County, GA, Troup County, GA, Union County, GA, Upson County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA, Wilkes County, GA

The radar

The Atlanta radar (KFFC), 66 km from the middle of the area, began a volume at 08:15 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

Birmingham, AL (KBMX), launched 00:00Z, 8.3 hours before the alert went out and 247 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: 748 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1011 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 347 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 3.7

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 Atlanta, GA wrote its last area forecast discussion before this flash flood watch went out at May 2, 3:58 AM EDT, 17 minutes earlier.

Area forecast discussion, May 2, 3:58 AM EDT, 17 minutes before

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Hazardous weather outlook, May 1, 10:15 PM EDT, 6 hours before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
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        Please try again in a few minutes.
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The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 2, 4:15 AM EDT	Flood Watch	FFC	Baldwin, Bibb, Bleckley, Chattahoochee, Crawford, Crisp and 30 more	47 hr

Nearby

Flash Flood Watches in Georgia, 2010 Every flash flood watch in 2010

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.