Alert archive / New Hampshire / Areal Flood Warnings in 2021

Areal Flood Warning 4, NWS Gray, ME

July 18, 2021Cheshire County, New Hampshire

NWS Gray, ME issued this areal flood warning at Jul 18, 2021, 3:00 PM EDT for Cheshire County, New Hampshire. It was in force for 30 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 18, 2021, 3:00 PM EDT (19:00 UTC)
Expired: Jul 19, 2021, 9:06 PM EDT
In force: 30 hr
Issued by: NWS Gray, ME
Area: Storm-based polygon
Flood severity: None

County Cheshire County, NH

The radar

The Boston radar (KBOX), 141 km from the middle of the area, began a volume at 19:01 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 12:00Z, 7.0 hours before the alert went out and 131 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: 4 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 522 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 107 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 warning 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 warning went out at Jul 18, 10:24 AM EDT, 4 hours 36 minutes earlier.

Area forecast discussion, Jul 18, 10:24 AM EDT, 4 hours 36 minutes before

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Hazardous weather outlook, Jul 18, 4:19 AM EDT, 10 hours 41 minutes before

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In the hours before

Local storm report, Jul 18, 1:53 PM EDT, 1 hour 7 minutes before

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Local storm report, Jul 18, 2:02 PM EDT, 58 minutes before

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Local storm report, Jul 18, 2:51 PM EDT, 9 minutes before

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        Please try again in a few minutes.
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Local storm report, Jul 18, 2:52 PM EDT, 8 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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        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, 2:53 PM EDT, 7 minutes before

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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.
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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, 3:00 PM EDT, 0 minutes before

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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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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 7:59 AM EDT	Areal Flood Advisory	GYX	Androscoggin, Cumberland, Lincoln, Sagadahoc, York	3 hr
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

Nearby

Areal Flood Warnings in New Hampshire, 2021 Every areal flood warning 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.