Alert archive / West Virginia / Special Weather Statements in 2021

Special Weather Statement, NWS Pittsburgh, PA

July 20, 2021Brooke County, West Virginia

NWS Pittsburgh, PA issued this special weather statement at Jul 20, 2021, 9:09 PM EDT for Brooke County, West Virginia. It was in force for 36 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: Jul 20, 2021, 9:09 PM EDT (01:09 UTC)
Expired: Jul 20, 2021, 9:45 PM EDT
In force: 36 min
Issued by: NWS Pittsburgh, PA

County Brooke County, WV

The radar

The Pittsburgh radar (KPBZ), 32 km from the middle of the area, began a volume at 01:09 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

Pittsburgh, PA (KPIT), launched 00:00Z, 1.2 hours before the alert went out and 36 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: 416 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1443 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 Pittsburgh, PA wrote its last area forecast discussion before this special weather statement went out at Jul 20, 7:19 PM EDT, 1 hour 50 minutes earlier.

Area forecast discussion, Jul 20, 7:19 PM EDT, 1 hour 50 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Pittsburgh PA
719 PM EDT Tue Jul 20 2021

.SYNOPSIS...
A crossing cold front will bring the risk for showers and
thunderstorms overnight and into Wednesday morning. Dry weather
should return Thursday under high pressure.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
Broken line of showers and thunderstorms has developed over the I-80
corridor. The main threat from these storms is heavy downpours and
large hail. The lack of strong shear is prohibiting the development
of long duration strong updrafts, but the storms are reaping the
benefits of short lived updrafts that are likely getting an assist
from outflows of the collapsing ones. This activity has developed
ahead of a surface boundary which got a boost from the lake breeze.
South of this line, activity is much weaker and very isolated. Expect
the activity to weaken during the evening hours as it moves further
away from the lake and the sun sets.

Will need to keep in the mention of showers and thunderstorms
overnight as the boundary crosses the region and receives an assist
from a crossing shortwave.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
Isolated to scattered showers will wane as the morning and system
progress on Wednesday. Cooler and less humid conditions are
expected behind the front as high pressure builds through Thursday
under NW flow aloft.

An approaching shortwave trough in the NW flow should result in low
chances for showers Thursday night, mainly N of PIT.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Model ensembles indicate troughing should persist across much of the
Eastern CONUS through the period. Occasional shower and thunderstorm
chances are expected as shortwaves embedded in NW flow aloft cross
the region, though significant timing/location differences exist in
the operational models. Stayed close to the blended ensemble guidance
to smooth out some of these differences.

&&

.AVIATION /23Z TUESDAY THROUGH SUNDAY/...
A shortwave trough, in nw flow, and its associated sfc cold front,
will move across the region overnight. Included tsra at FKl and DUJ
as scattered showers/tstms move across the region with the
approaching front. Cig deterioration to MVFR and IFR is then expected
after FROPA late tonight for ports near and N of PIT. Restrictions
are possible through erly Wed with the crossing cold front.

.Outlook...
The next restriction chc is expected Fri and Sat with crossing
fronts.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...None.
OH...None.
WV...None.

&&

Hazardous weather outlook, Jul 20, 3:19 AM EDT, 17 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
319 AM EDT Tue Jul 20 2021

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029-
031-073>076-WVZ001>004-012-021-509>514-210730-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest-
Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-Armstrong-
Indiana-Washington-Greene-Westmoreland-
Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel-
Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
319 AM EDT Tue Jul 20 2021

This Hazardous Weather Outlook is for east central Ohio, western
Pennsylvania, and northern West Virginia.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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, Jul 20, 8:20 PM EDT, 49 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
820 PM EDT Tue Jul 20 2021

OHZ041-PAZ013-020-210045-
Columbiana-Lawrence-Beaver-
820 PM EDT Tue Jul 20 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN COLUMBIANA...
NORTHWESTERN BEAVER AND SOUTHWESTERN LAWRENCE COUNTIES...

At 820 PM EDT, a strong thunderstorm was located over Leetonia, or
near Salem, moving southeast at 30 mph.

Locations impacted include...
Salem...                          Columbiana...
East Palestine...                 Lisbon...
Leetonia...                       New Waterford...
Enon Valley...                    Rogers...
Negley...                         Lake Tomahawk...
Beaver Creek State Park...

LAT...LON 4090 8082 4090 8052 4091 8052 4087 8040
      4070 8065 4090 8093 4090 8090 4093 8089
      4093 8082
TIME...MOT...LOC 0020Z 303DEG 28KT 4089 8077

Local storm report, Jul 20, 8:22 PM EDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
822 PM EDT TUE JUL 20 2021

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

0735 PM     TSTM WND DMG     PLEASANTVILLE           41.59N  79.58W
07/20/2021                   VENANGO            PA   LAW ENFORCEMENT

            NUMEROUS TREES DOWN

&&

EVENT NUMBER PBZ2102009

RRR

Special weather statement, Jul 20, 8:31 PM EDT, 38 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
831 PM EDT Tue Jul 20 2021

PAZ013-014-020-021-210100-
Butler-Lawrence-Beaver-Allegheny-
831 PM EDT Tue Jul 20 2021

...AN AREA OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING HAIL AND
GUSTY WIND WILL AFFECT SOUTHEASTERN BEAVER...SOUTHERN LAWRENCE...
SOUTHWESTERN BUTLER AND NORTHWESTERN ALLEGHENY COUNTIES...

At 831 PM EDT, strong thunderstorms were clustered over Economy, or
near Aliquippa, moving east at 25 mph.

Wind gusts up to 55 mph and hail up to the size of nickels are
possible with this storm.

Locations impacted include...
Pittsburgh...                     Ross Township...
McCandless Township...            Cranberry...
Moon Township...                  Franklin Park...
Aliquippa...                      Beaver Falls...
Monaca...                         Shaler Township...
Hampton Township...               Robinson Township...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 16 and 43.
  Interstate 79 in Pennsylvania between mile markers 62 and 96.
  Interstate 376 in Pennsylvania between mile markers 36 and 58.

LAT...LON 4064 8045 4095 8009 4075 7981 4048 7992
      4045 8027
TIME...MOT...LOC 0031Z 289DEG 20KT 4062 8017

Local storm report, Jul 20, 8:33 PM EDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
833 PM EDT TUE JUL 20 2021

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

0745 PM     TSTM WND DMG     TIONESTA                41.50N  79.45W
07/20/2021                   FOREST             PA   911 CALL CENTER

            MULTIPLE TREES DOWN. TIME ESTIMATED FROM RADAR.

&&

EVENT NUMBER PBZ2102010

RRR

Local storm report, Jul 20, 8:48 PM EDT, 21 minutes before

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Special weather statement, Jul 20, 9:09 PM EDT, 0 minutes before

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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 8:31 PM EDT	Special Weather Statement	PBZ	Beaver	29 min
Jul 20, 8:32 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Forest, Indiana, Jefferson	43 min
Jul 20, 8:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	30 min
Jul 20, 9:11 PM EDT	Special Weather Statement	PBZ	Butler	34 min
Jul 20, 9:16 PM EDT	Special Weather Statement	PBZ	Armstrong	29 min
Jul 20, 9:39 PM EDT	Special Weather Statement	PBZ	Armstrong	36 min
Jul 20, 8:01 PM EDT	Special Weather Statement	PBZ	Hancock	29 min
Jul 20, 9:38 PM EDT	Special Weather Statement	PBZ	Brooke	37 min
Jul 21, 4:44 AM EDT	Special Weather Statement	PBZ	Marion, Monongalia, Preston	46 min
Jul 20, 8:20 PM EDT	Special Weather Statement	PBZ	Columbiana	25 min

Nearby

Special Weather Statements in West Virginia, 2021 Every special weather statement 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.