Alert archive / Ohio / Special Weather Statements in 2017

Special Weather Statement, NWS Charleston, WV

August 19, 2017Perry County, Ohio

NWS Charleston, WV issued this special weather statement at Aug 19, 2017, 6:42 PM EDT for Perry County, Ohio. It was in force for 63 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: Aug 19, 2017, 6:42 PM EDT (22:42 UTC)
Expired: Aug 19, 2017, 7:45 PM EDT
In force: 63 min
Issued by: NWS Charleston, WV

County Perry County, OH

The radar

The Cincinnati radar (KILN), 152 km from the middle of the area, began a volume at 22:45 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.7 hours before the alert went out and 150 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: 229 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1524 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -93 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

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 Charleston, WV wrote its last area forecast discussion before this special weather statement went out at Aug 19, 5:51 PM EDT, 51 minutes earlier.

Area forecast discussion, Aug 19, 5:51 PM EDT, 51 minutes before

Area Forecast Discussion
National Weather Service Charleston WV
551 PM EDT Sat Aug 19 2017

.SYNOPSIS...
An upper trough brings showers and storms to northern areas
through this evening. High pressure Sunday through Tuesday. Strong
cold front mid week. Cooler and drier for the end of the week.

&&

.NEAR TERM /UNTIL 10 PM THIS EVENING/...
As of 550 PM Saturday...

Updated forecast to better handle convection over central OH and
northern WV.

As of 300 PM Saturday...

Surface cold front and upper trough will pass just to our north
this afternoon and evening. Currently along the front showers
and thunderstorms have been kicking off across Northeast Ohio
and pushing into Western PA. Forecast soundings indicate drier
air in the midlevels across our Ohio Counties and Northern WV
and this will likely damper the convection in our area. However,
we are on the fringe of the better moisture and as the trough
pushes eastward this afternoon we will see an increase in lapse
rates to above 7C/Km and moisture may sag far enough south.
Although the strongest storms will be just off to our north,
there will be some potential for storms to reach severe limits
with damaging wind gusts being the main threat.

Storms will quickly dissipate this evening with the loss of
heating and high pressure pushes in. Clear skies and light winds
overnight will make for favorable conditions for dense valley
fog to develop. Tomorrow will be dry across the entire area with
seasonable temps and mostly sunny skies.

&&

.SHORT TERM /10 PM THIS EVENING THROUGH TUESDAY/...
As of 300 PM Saturday...

Zonal upper level flow will hold in place for much of the
period. In the lower levels, a broad Bermuda-type high enhances
south-westerly flow gradually bringing in moisture and higher
temperatures. Lowland highs on Monday will be in the upper-80's
to near 90, even accounting for the brief lapse in solar
insulation with the nearby Total Eclipse. Foggy mornings are
likely with increasing moisture and weak flow overall.

Isolated mountain showers are possible Monday afternoon with the
passage of a small disturbance in the otherwise zonal upper level
flow... the presence of moisture and forcing, albeit weak, doesn't
allow for completely clear Eclipse conditions. Best viewing
conditions with this forecast issuance exist in the lowlands of
West Virginia and in eastern Kentucky. Tuesday, an approaching
low will introduce modest height falls aloft and greater
instability with growing shower and storm activity through the
day.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
As of 300 PM Saturday...

A strong cold front will move through the area Tuesday night
through midday Wednesday. Due to its overnight timing, overall
severe threat looks low for frontal passage though momentum
transfer could bring stronger gusts to the surface. Showers and
storms should taper off in the eastern mountains by late
afternoon. Behind the front, much cooler and drier conditions
will settle in with strong surface high pressure centered over
the Great Lakes region. Aloft, deep northwest flow originating
in Canada will keep weather generally clear with the caveat of
low-predictability in subtle disturbances that may drum up
isolated precipitation. Northwest flow aloft continues through
the end of the forecast period.

&&

.AVIATION /00Z SATURDAY THROUGH THURSDAY/...
As of 550 PM Saturday...

An upper level trough will produce some showers and thunderstorms
across central Oh and northern WV this evening. Outside of any
storms, expect VFR conditions.

Late tonight, some river valley fog can be expected in the mountain
valleys. Fog may or may not form in river valleys west of the
mountains.

Once any fog burns off Sunday morning, VFR conditions can be
expected with a cumulus deck.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z MONDAY...

FORECAST CONFIDENCE: High, except low with fog.

ALTERNATE SCENARIOS: Timing, density, and location of fog
late tonight could vary.

EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH:   TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW:    TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

UTC 1HRLY       22   23   00   01   02   03   04   05   06   07   08   09
EDT 1HRLY       18   19   20   21   22   23   00   01   02   03   04   05
CRW CONSISTENCY  H    H    H    H    H    H    H    H    M    M    L    L
HTS CONSISTENCY  H    H    H    H    H    H    H    L    L    L    L    L
BKW CONSISTENCY  H    H    H    H    H    H    H    H    H    M    L    L
EKN CONSISTENCY  H    H    H    H    H    H    H    M    M    L    M    M
PKB CONSISTENCY  H    H    H    H    H    H    H    H    M    M    L    L
CKB CONSISTENCY  M    M    H    H    H    H    H    H    H    M    L    L

AFTER 00Z MONDAY...
Dense river valley fog possible each morning.

&&

.RLX WATCHES/WARNINGS/ADVISORIES...
WV...None.
OH...None.
KY...None.
VA...None.

&&

SYNOPSIS...MPK/MC
NEAR TERM...RPY/MPK
SHORT TERM...MC
LONG TERM...MC
AVIATION...RPY

Hazardous weather outlook, Aug 19, 2:40 AM EDT, 16 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Charleston WV
240 AM EDT Sat Aug 19 2017

KYZ101>103-105-OHZ066-067-075-076-083>087-VAZ003-004-WVZ005>011-
013>020-024>034-039-040-515>526-200645-
Greenup-Carter-Boyd-Lawrence KY-Perry-Morgan-Athens-Washington-
Jackson OH-Vinton-Meigs-Gallia-Lawrence OH-Dickenson-Buchanan-Wayne-
Cabell-Mason-Jackson WV-Wood-Pleasants-Tyler-Lincoln-Putnam-Kanawha-
Roane-Wirt-Calhoun-Ritchie-Doddridge-Mingo-Logan-Boone-Clay-Braxton-
Gilmer-Lewis-Harrison-Taylor-McDowell-Wyoming-Upshur-Barbour-
Northwest Raleigh-Southeast Raleigh-Northwest Fayette-
Southeast Fayette-Northwest Nicholas-Southeast Nicholas-
Northwest Webster-Southeast Webster-Northwest Pocahontas-
Southeast Pocahontas-Northwest Randolph-Southeast Randolph-
240 AM EDT Sat Aug 19 2017

This Hazardous Weather Outlook is for northeast Kentucky, southeast
Ohio, southwest Virginia and much of West Virginia.

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 19, 2:30 PM EDT, 4 hours 12 minutes before

Special Weather Statement
National Weather Service Charleston WV
230 PM EDT SAT AUG 19 2017

OHZ075-084-191900-
Athens-Vinton-
230 PM EDT SAT AUG 19 2017

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ATHENS AND
NORTHEASTERN VINTON COUNTIES...

At 229 PM EDT, a strong thunderstorm was located near Mcarthur,
moving east at 15 mph.

Wind gusts up to 50 mph and half inch hail are possible with this
storm.

Locations impacted include...
Lake Hope State Park, Zaleski and Creola.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

If you are on or near Lake Hope State Park, get out of the water and
move indoors or inside a vehicle. Remember, lightning can strike out
to 10 miles from the parent thunderstorm. If you can hear thunder,
you are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

LAT...LON 3935 8223 3926 8231 3928 8255 3933 8255
      3939 8233 3939 8229 3940 8229 3940 8228
TIME...MOT...LOC 1829Z 255DEG 15KT 3931 8247

Cooper

Local storm report, Aug 19, 6:06 PM EDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON WV
606 PM EDT SAT AUG 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0555 PM     HAIL             NW MACKSBURG            39.63N  81.46W
08/19/2017  E0.70 INCH       WASHINGTON         OH   PUBLIC

&&

EVENT NUMBER RLX1700625

RPY

Local storm report, Aug 19, 6:17 PM EDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON WV
617 PM EDT SAT AUG 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     HAIL             1 NW MACKSBURG          39.64N  81.47W
08/19/2017  E1.00 INCH       WASHINGTON         OH   PUBLIC

&&

EVENT NUMBER RLX1700626

RPY

Special weather statement, Aug 19, 6:35 PM EDT, 7 minutes before

Special Weather Statement
National Weather Service Charleston WV
635 PM EDT SAT AUG 19 2017

WVZ031-192300-
Harrison-
635 PM EDT SAT AUG 19 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN HARRISON COUNTY...

At 635 PM EDT, a strong thunderstorm was located near Lumberport, or
9 miles southwest of Mannington, moving east at 25 mph.

Winds in excess of 40 mph and nickel size hail are possible with this
storm.

Locations impacted include...
Bridgeport, Shinnston, Lumberport and Enterprise.

LAT...LON 3942 8025 3941 8022 3934 8023 3939 8047
      3943 8046
TIME...MOT...LOC 2235Z 282DEG 20KT 3940 8042

30

Special weather statement, Aug 19, 6:42 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Charleston WV
642 PM EDT SAT AUG 19 2017

OHZ066-067-192345-
Morgan-Perry-
642 PM EDT SAT AUG 19 2017

...HEAVY RAINFALL WILL AFFECT EAST CENTRAL PERRY AND NORTHWESTERN
MORGAN COUNTIES...

At 640 PM EDT, radar indicated strong thunderstorms located along a
line extending from Somerset to near Perry State Forest.
Movement was east at 15 mph.

Locations impacted include...
Somerset, Perry State Forest and Crooksville.

Torrential rainfall is occurring with these storms, and may cause
localized flooding. One to two inches of rain can be expected in a
short time frame. Do not drive your vehicle through flooded
roadways.

Excessive runoff from heavy rainfall will cause elevated levels on
small creeks and streams, and ponding of water on country roads and
farmland along the banks of creeks and streams.

LAT...LON 3978 8208 3977 8208 3977 8203 3976 8199
      3971 8203 3979 8230 3983 8227
TIME...MOT...LOC 2240Z 292DEG 13KT 3981 8231 3977 8214

30

The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 6:35 PM EDT	Special Weather Statement	RLX	Harrison	25 min
Aug 19, 7:14 PM EDT	Severe Thunderstorm Warning	RLX	Pleasants, Ritchie, Wood	31 min
Aug 19, 7:25 PM EDT	Special Weather Statement	RLX	Barbour	35 min
Aug 19, 7:27 PM EDT	Special Weather Statement	RLX	Tyler	33 min
Aug 19, 7:58 PM EDT	Special Weather Statement	RLX	Doddridge	32 min
Aug 19, 2:30 PM EDT	Special Weather Statement	RLX	Vinton	30 min
Aug 19, 5:49 PM EDT	Severe Thunderstorm Warning	RLX	Washington	24 min

Nearby

Special Weather Statements in Ohio, 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.