Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 33, NWS Gray, ME

July 17, 20184 counties in New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 17, 2018, 7:56 AM EDT for 4 counties in New Hampshire. It was in force for 37 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 17, 2018, 7:56 AM EDT (11:56 UTC)
Expired
Jul 17, 2018, 8:33 AM EDT
In force
37 min
Issued by
NWS Gray, ME
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH

The radar

The Boston radar (KBOX), 147 km from the middle of the area, began a volume at 11:58 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, 11.9 hours before the alert went out and 159 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-pSkew-T log-p diagram, Albany, NY at 00:00Z on 2018-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 962 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2018-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
962 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
1483 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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 17, 7:16 AM EDT, 40 minutes earlier.

Area forecast discussion, Jul 17, 7:16 AM EDT, 40 minutes before
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Hazardous weather outlook, Jul 17, 7:11 AM EDT, 45 minutes before
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In the hours before

Special weather statement, Jul 17, 6:01 AM EDT, 1 hour 55 minutes before
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Special weather statement, Jul 17, 7:26 AM EDT, 30 minutes before
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<body>
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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.
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        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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Special weather statement, Jul 17, 7:28 AM EDT, 28 minutes before
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<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.
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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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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 2:58 AM EDTFlash Flood WatchGYXYork14 hr
Jul 17, 6:01 AM EDTSpecial Weather StatementGYXFranklin59 min
Jul 17, 7:26 AM EDTSpecial Weather StatementGYXSomerset64 min
Jul 17, 11:20 AM EDTAreal Flood AdvisoryGYXFranklin, Somerset3 hr
Jul 17, 12:06 PM EDTSevere Thunderstorm WarningGYXYork54 min
Jul 17, 12:25 PM EDTSpecial Weather StatementGYXYork35 min
Jul 17, 12:27 PM EDTSevere Thunderstorm WarningGYXYork48 min
Jul 17, 12:31 PM EDTSpecial Marine WarningGYX59 min
Jul 17, 12:33 PM EDTAreal Flood AdvisoryGYXYork117 min
Jul 17, 1:12 PM EDTSpecial Marine WarningGYX63 min
Jul 17, 1:28 PM EDTSpecial Marine WarningGYX92 min
Jul 17, 3:15 PM EDTAreal Flood AdvisoryGYXYork2 hr
Jul 17, 6:39 PM EDTAreal Flood AdvisoryGYXSomerset3 hr
Jul 16, 10:00 PM EDTSpecial Weather StatementGYXCheshire45 min
Jul 16, 10:46 PM EDTSpecial Weather StatementGYXCheshire59 min
Jul 16, 11:46 PM EDTSpecial Weather StatementGYXHillsborough59 min
Jul 17, 7:28 AM EDTSpecial Weather StatementGYXSullivan47 min
Jul 17, 9:35 AM EDTSpecial Weather StatementGYXSullivan40 min
Jul 17, 10:02 AM EDTSpecial Weather StatementGYXSullivan43 min
Jul 17, 10:14 AM EDTSevere Thunderstorm WarningGYXCheshire, Hillsborough, Merrimack, Sullivan61 min
Jul 17, 10:54 AM EDTSevere Thunderstorm WarningGYXBelknap, Hillsborough, Merrimack, Rockingham, Strafford66 min
Jul 17, 11:23 AM EDTSpecial Weather StatementGYXHillsborough37 min
Jul 17, 11:34 AM EDTSevere Thunderstorm WarningGYXHillsborough, Merrimack, Rockingham56 min
Jul 17, 11:42 AM EDTAreal Flood AdvisoryGYXCheshire, Hillsborough3 hr
Jul 17, 11:58 AM EDTAreal Flood AdvisoryGYXHillsborough, Merrimack, Rockingham2 hr
Jul 17, 12:04 PM EDTSpecial Weather StatementGYXHillsborough26 min
Jul 17, 12:23 PM EDTFlash Flood WarningGYXCheshire, Hillsborough, Merrimack, Rockingham3 hr
Jul 17, 12:29 PM EDTSevere Thunderstorm WarningGYXHillsborough, Rockingham61 min
Jul 17, 3:11 PM EDTAreal Flood AdvisoryGYXCheshire, Hillsborough, Rockingham, Strafford2 hr
Jul 17, 4:22 PM EDTSpecial Weather StatementGYXCoos23 min
Jul 17, 5:32 PM EDTSpecial Weather StatementGYXCoos28 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2018Every severe thunderstorm warning in 2018

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.