Alert archive / Virginia / Special Weather Statements in 2017

Special Weather Statement, NWS Blacksburg, VA

June 18, 2017City of Roanoke, Virginia

NWS Blacksburg, VA issued this special weather statement at Jun 18, 2017, 1:52 PM EDT for City of Roanoke, Virginia. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 18, 2017, 1:52 PM EDT (17:52 UTC)
Expired: Jun 18, 2017, 2:30 PM EDT
In force: 38 min
Issued by: NWS Blacksburg, VA

County City of Roanoke, VA

The radar

The Roanoke radar (KFCX), 53 km from the middle of the area, began a volume at 17:52 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 5.9 hours before the alert went out and 138 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: 711 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 664 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jun 18, 10:19 AM EDT, 3 hours 33 minutes earlier.

Area forecast discussion, Jun 18, 10:19 AM EDT, 3 hours 33 minutes before

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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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.
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      <p id="message2">
        Please try again in a few minutes.
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Hazardous weather outlook, Jun 18, 4:24 AM EDT, 9 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Blacksburg VA
424 AM EDT Sun Jun 18 2017

VAZ007-WVZ042>044-507-508-190830-
Tazewell-Mercer-Summers-Monroe-Eastern Greenbrier-Western Greenbrier-
424 AM EDT Sun Jun 18 2017

This Hazardous Weather Outlook is for southwest Virginia and
southeast West Virginia.

.DAY ONE...Today and tonight.

Scattered slow moving strong to isolated severe thunderstorms could
produce localized flooding this afternoon through tonight.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Additional strong to isolated severe thunderstorms will be possible
Monday along a passing cold front. Heavy rainfall may also result in
localized flooding. For Tuesday through Saturday, the probability for
widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ001>006-018>020-VAZ009>020-022>024-032>035-043>047-058-059-190830-
Ashe-Alleghany NC-Surry-Stokes-Rockingham-Caswell-Watauga-Wilkes-
Yadkin-Smyth-Bland-Giles-Wythe-Pulaski-Montgomery-Grayson-Carroll-
Floyd-Craig-Alleghany VA-Bath-Roanoke-Botetourt-Rockbridge-Patrick-
Franklin-Bedford-Amherst-Henry-Pittsylvania-Campbell-Appomattox-
Buckingham-Halifax-Charlotte-
424 AM EDT Sun Jun 18 2017

This Hazardous Weather Outlook is for north central North Carolina,
northwest North Carolina, central Virginia, south central Virginia,
southwest Virginia and west central Virginia.

.DAY ONE...Today and tonight.

Scattered slow moving strong thunderstorms could produce localized
flooding this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

There is a slight risk for severe thunderstorms containing damaging
winds as well as large hail ahead of a cold front on Monday. Locally
heavy rainfall could also result in localized flooding. For Tuesday
through Saturday, the probability for widespread hazardous weather
is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 18, 1:48 PM EDT, 4 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
148 PM EDT SUN JUN 18 2017

VAZ009-012-015-181815-
Grayson-Wythe-Smyth-
148 PM EDT SUN JUN 18 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN
SMYTH...SOUTHWESTERN WYTHE AND NORTH CENTRAL GRAYSON COUNTIES...

At 147 PM EDT, a strong thunderstorm was located over Troutdale,
moving northeast at 15 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Sugar Grove...
Troutdale...
Flatridge...
and Comers Rock.

LAT...LON 3666 8137 3671 8144 3687 8134 3680 8116
TIME...MOT...LOC 1747Z 219DEG 15KT 3672 8139

DS

Special weather statement, Jun 18, 1:52 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service BLACKSBURG VA
152 PM EDT SUN JUN 18 2017

VAZ022-034-181830-
Roanoke-Bedford-
152 PM EDT SUN JUN 18 2017

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL ROANOKE AND WEST
CENTRAL BEDFORD COUNTIES...

At 152 PM EDT, a strong thunderstorm was located over Vinton, moving
northeast at 20 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Roanoke...
Vinton...
and Stewartsville.

LAT...LON 3733 7971 3722 7988 3725 7991 3733 7987
      3731 7985 3732 7984 3734 7981 3734 7980
      3735 7979 3737 7978 3736 7977
TIME...MOT...LOC 1752Z 219DEG 18KT 3725 7989

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 1:48 PM EDT	Special Weather Statement	RNK	Grayson	27 min
Jun 18, 3:08 PM EDT	Special Weather Statement	RNK	Smyth	22 min
Jun 18, 4:59 PM EDT	Special Weather Statement	RNK	Smyth	61 min

Nearby

Special Weather Statements in Virginia, 2017 Every special weather statement in 2017

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.