Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 115, NWS Gray, ME

July 10, 2007Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 10, 2007, 3:44 PM EDT for Grafton County, New Hampshire. It was in force for 46 min. 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 10, 2007, 3:44 PM EDT (19:44 UTC)
Expired: Jul 10, 2007, 4:30 PM EDT
In force: 46 min
Issued by: NWS Gray, ME
Area: Counties, with a storm outline in the text

County Grafton County, NH

The radar

The Burlington radar (KCXX), 125 km from the middle of the area, began a volume at 19:47 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 10, 12:59 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.7 hours before the alert went out and 214 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: 2432 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 10, 3:35 PM EDT, 9 minutes earlier.

Area forecast discussion, Jul 10, 3:35 PM EDT, 9 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, Jul 10, 1:11 PM EDT, 2 hours 33 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 Gray, ME issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 9, 10:59 PM EDT	Special Marine Warning	GYX		61 min
Jul 9, 8:22 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack	38 min
Jul 9, 8:25 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	35 min
Jul 9, 8:49 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	26 min
Jul 9, 9:19 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack	41 min
Jul 9, 9:21 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Rockingham	39 min
Jul 9, 9:59 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Rockingham	46 min
Jul 9, 10:05 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Sullivan	25 min
Jul 9, 10:10 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	35 min
Jul 9, 10:22 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack	38 min
Jul 9, 10:45 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	45 min
Jul 10, 2:41 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Sullivan	64 min
Jul 10, 6:35 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	25 min
Jul 10, 7:14 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	31 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2007 Every severe thunderstorm warning in 2007

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.