Alert archive / Virginia / Flash Flood Watches in 2020

Flash Flood Watch 12, NWS Blacksburg, VA

August 21, 202028 counties in Virginia; 7 counties in North Carolina

NWS Blacksburg, VA issued this flash flood watch at Aug 21, 2020, 4:15 AM EDT for 28 counties in Virginia; 7 counties in North Carolina. It took effect at Aug 21, 2020, 6:00 AM EDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Aug 21, 2020, 4:15 AM EDT (08:15 UTC)
In effect from: Aug 21, 2020, 6:00 AM EDT
Expired: Aug 22, 2020, 6:00 AM EDT
In force: 24 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 35 counties

Alleghany County, NC, Ashe County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Buena Vista, VA, City of Covington, VA, City of Galax, VA, City of Lexington, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Smyth County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 9 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.

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 Blacksburg, VA wrote its last area forecast discussion before this flash flood watch went out at Aug 20, 7:35 PM EDT, 8 hours 40 minutes earlier.

Area forecast discussion, Aug 20, 7:35 PM EDT, 8 hours 40 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Aug 20, 2:01 PM EDT, 14 hours 14 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 21, 7:45 AM EDT	Areal Flood Advisory	RNK	Franklin, Henry	3 hr
Aug 21, 8:27 AM EDT	Flash Flood Warning Emergency	RNK	Henry	6 hr
Aug 21, 9:04 AM EDT	Areal Flood Advisory	RNK	Patrick	3 hr
Aug 21, 10:05 AM EDT	Areal Flood Advisory	RNK	Henry, City of Martinsville	3 hr
Aug 21, 10:11 AM EDT	Flash Flood Warning	RNK	Henry, City of Martinsville	6 hr
Aug 21, 12:04 PM EDT	Areal Flood Advisory	RNK	Henry, Pittsylvania	3 hr
Aug 21, 1:41 PM EDT	Areal Flood Advisory	RNK	Pittsylvania, City of Danville	2 hr
Aug 21, 7:22 AM EDT	Areal Flood Advisory	RNK	Stokes, Surry, Wilkes, Yadkin	3 hr
Aug 21, 8:40 AM EDT	Flash Flood Warning	RNK	Stokes	4 hr
Aug 21, 8:49 AM EDT	Areal Flood Advisory	RNK	Yadkin	3 hr
Aug 21, 11:28 AM EDT	Areal Flood Advisory	RNK	Rockingham, Stokes	2 hr

Nearby

Flash Flood Watches in Virginia, 2020 Flash Flood Watches in North Carolina, 2020 Every flash flood watch in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.