Alert archive / Maine / Areal Flood Advisories in 2021

Areal Flood Advisory 13, NWS Gray, ME

July 18, 20215 counties in Maine; 4 counties in New Hampshire

NWS Gray, ME issued this areal flood advisory at Jul 18, 2021, 7:59 AM EDT for 5 counties in Maine; 4 counties in New Hampshire. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 18, 2021, 7:59 AM EDT (11:59 UTC)
Expired: Jul 18, 2021, 11:00 AM EDT
In force: 3 hr
Issued by: NWS Gray, ME
Area: Storm-based polygon

Counties Androscoggin County, ME, Cumberland County, ME, Lincoln County, ME, Sagadahoc County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 37 km from the middle of the area, began a volume at 12:03 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

Albany, NY (KALY), launched 00:00Z, 12.0 hours before the alert went out and 284 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: 30 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 163 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 areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gray, ME wrote its last area forecast discussion before this areal flood advisory went out at Jul 18, 6:35 AM EDT, 1 hour 24 minutes earlier.

Area forecast discussion, Jul 18, 6:35 AM EDT, 1 hour 24 minutes before

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Hazardous weather outlook, Jul 18, 4:19 AM EDT, 3 hours 40 minutes before

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In the hours before

Special weather statement, Jul 18, 6:34 AM EDT, 1 hour 25 minutes before

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Local storm report, Jul 18, 7:40 AM EDT, 19 minutes before

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Local storm report, Jul 18, 7:43 AM EDT, 16 minutes before

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Local storm report, Jul 18, 7:52 AM EDT, 7 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Jul 18, 7:54 AM EDT, 5 minutes before

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<body>
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      <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.
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Local storm report, Jul 18, 7:55 AM EDT, 4 minutes before

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  <main class="wrap">
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      <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>
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  </main>
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</body>
</html>

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 9:50 AM EDT	Areal Flood Advisory	GYX	Cumberland, Kennebec, Knox, Lincoln, Sagadahoc, Waldo	3 hr
Jul 18, 10:36 AM EDT	Flash Flood Warning	GYX	Androscoggin, Cumberland, Kennebec, Knox, Lincoln, Sagadahoc	84 min
Jul 17, 10:42 PM EDT	Areal Flood Warning	GYX	Cheshire, Hillsborough	3 hr
Jul 17, 11:03 PM EDT	Special Weather Statement	GYX	Hillsborough	42 min
Jul 18, 12:01 AM EDT	Flash Flood Warning	GYX	Cheshire, Hillsborough	4 hr
Jul 18, 3:55 AM EDT	Areal Flood Advisory	GYX	Cheshire, Hillsborough	2 hr
Jul 18, 5:56 AM EDT	Special Weather Statement	GYX	Rockingham	34 min
Jul 18, 6:26 AM EDT	Areal Flood Warning	GYX	Cheshire, Hillsborough	6 hr
Jul 18, 6:34 AM EDT	Special Weather Statement	GYX	Rockingham	26 min
Jul 18, 3:00 PM EDT	Areal Flood Warning	GYX	Cheshire	30 hr

Nearby

Areal Flood Advisories in Maine, 2021 Areal Flood Advisories in New Hampshire, 2021 Every areal flood advisory in 2021

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.