Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Pittsburgh, PA

June 20, 2021Armstrong County, Pennsylvania

NWS Pittsburgh, PA issued this special weather statement at Jun 20, 2021, 8:55 PM EDT for Armstrong County, Pennsylvania. It was in force for 20 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 20, 2021, 8:55 PM EDT (00:55 UTC)
Expired: Jun 20, 2021, 9:15 PM EDT
In force: 20 min
Issued by: NWS Pittsburgh, PA

County Armstrong County, PA

The radar

The Pittsburgh radar (KPBZ), 73 km from the middle of the area, began a volume at 00:57 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, 0.9 hours before the alert went out and 76 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: 1681 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1290 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.0

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 Pittsburgh, PA wrote its last area forecast discussion before this special weather statement went out at Jun 20, 7:42 PM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, Jun 20, 7:42 PM EDT, 1 hour 13 minutes before

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Hazardous weather outlook, Jun 20, 2:28 AM EDT, 18 hours 27 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
228 AM EDT Sun Jun 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>514-210630-
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-
228 AM EDT Sun Jun 20 2021

This Hazardous Weather Outlook is for east central Ohio, northwest
Pennsylvania, southwest Pennsylvania, western Pennsylvania,
northern West Virginia and the northern panhandle of West Virginia.

.DAY ONE...Today and tonight.

Thunderstorms are expected this afternoon and evening. A few storms
could be strong with wind gusts being the main threat.

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

A cold front will push southeast Monday afternoon bringing a chance
of thunderstorms. Some storms could be severe with damaging wind
gusts being the main threat. Heavy rainfall is also a concern.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

In the hours before

Special weather statement, Jun 20, 5:19 PM EDT, 3 hours 36 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
519 PM EDT Sun Jun 20 2021

OHZ039>041-202145-
Tuscarawas-Columbiana-Carroll-
519 PM EDT Sun Jun 20 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT SOUTHWESTERN COLUMBIANA...NORTHERN CARROLL AND
NORTHEASTERN TUSCARAWAS COUNTIES...

At 518 PM EDT, a strong thunderstorm was located near Waynesburg, or
7 miles northwest of Carrollton, moving northeast at 20 mph.

Wind gusts of 45 to 55 mph are possible with this storm and
further strengthening is possible.

Locations impacted include...
Carrollton...                     Minerva...
Augusta...                        Malvern...
Hanoverton...                     Dellroy...
Summitville...                    East Rochester...
Homeworth...                      Atwood Lake...

Torrential rainfall also is occurring with this storm and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4065 8124 4072 8124 4073 8109 4088 8109
      4089 8108 4068 8085 4054 8122 4065 8136
TIME...MOT...LOC 2118Z 229DEG 18KT 4063 8122

Special weather statement, Jun 20, 5:38 PM EDT, 3 hours 17 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
538 PM EDT Sun Jun 20 2021

PAZ007-202200-
Mercer-
538 PM EDT Sun Jun 20 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT NORTHERN MERCER COUNTY...

At 537 PM EDT, a strong thunderstorm was located near Sharpsville,
moving east at 30 mph.

Wind gusts of 45 to 55 mph are possible with this storm.  One to two
inches of rapid rainfall is also possible.  This storm may
strengthen further.

Locations impacted include...
Hermitage...                      Sharon...
Sharpsville...                    Greenville...
Clark...                          Fredonia...
Jackson Center...                 Sheakleyville...
Maurice K Goddard State Park...

This includes Interstate 79 in Pennsylvania between mile markers 121
and 134.

Torrential rainfall also is occurring with this storm and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4124 8011 4123 8052 4144 8052 4148 8027
      4148 8017
TIME...MOT...LOC 2137Z 260DEG 27KT 4132 8056

Special weather statement, Jun 20, 5:51 PM EDT, 3 hours 4 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
551 PM EDT Sun Jun 20 2021

OHZ041-202215-
Columbiana-
551 PM EDT Sun Jun 20 2021

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND AND HEAVY
RAIN WILL AFFECT NORTHWESTERN COLUMBIANA COUNTY...

At 550 PM EDT, a strong thunderstorm was located near Alliance, or 11
miles west of Salem, moving northeast at 35 mph.

Wind gusts of 40 to 50 mph are possible with this storm.

Locations impacted include...
Salem...                          Leetonia...
Homeworth...                      North Georgetown...
Winona...

Torrential rainfall also is occurring with this storm and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4090 8082 4090 8072 4076 8105 4079 8109
      4090 8108 4090 8090 4093 8089 4093 8082
TIME...MOT...LOC 2150Z 230DEG 30KT 4086 8106

Special weather statement, Jun 20, 6:48 PM EDT, 2 hours 7 minutes before

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Local storm report, Jun 20, 7:34 PM EDT, 1 hour 21 minutes before

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Special weather statement, Jun 20, 8:55 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
Jun 21, 7:27 AM EDT	Special Weather Statement	PBZ	Lawrence, Mercer	33 min
Jun 21, 1:57 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	48 min
Jun 21, 2:08 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	22 min
Jun 21, 2:15 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	30 min
Jun 21, 2:21 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	24 min
Jun 21, 2:37 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Lawrence, Washington	23 min
Jun 21, 2:45 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Venango	30 min
Jun 21, 2:51 PM EDT	Tornado Warning	PBZ	Allegheny, Beaver, Butler	9 min
Jun 21, 2:55 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Westmoreland	35 min
Jun 21, 2:58 PM EDT	Tornado Warning	PBZ	Allegheny, Butler	17 min
Jun 21, 3:00 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	30 min
Jun 21, 3:21 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	24 min
Jun 21, 3:25 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Westmoreland	35 min
Jun 21, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	46 min
Jun 21, 3:37 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Jefferson, Westmoreland	23 min
Jun 21, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	45 min
Jun 21, 3:47 PM EDT	Special Weather Statement	PBZ	Washington	28 min
Jun 21, 3:53 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	37 min
Jun 21, 3:55 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Westmoreland	111 min
Jun 21, 3:55 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	35 min
Jun 21, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	33 min
Jun 21, 4:05 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	25 min
Jun 21, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
Jun 21, 4:18 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	27 min
Jun 21, 4:19 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	41 min
Jun 21, 4:27 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	33 min
Jun 21, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	32 min
Jun 21, 4:41 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	49 min
Jun 21, 4:43 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
Jun 21, 4:57 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	29 min
Jun 21, 5:03 PM EDT	Tornado Warning	PBZ	Greene	6 min
Jun 21, 5:08 PM EDT	Areal Flood Advisory	PBZ	Fayette, Greene, Washington, Westmoreland	3 hr
Jun 21, 6:39 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Greene, Washington, Westmoreland	2 hr
Jun 21, 6:43 PM EDT	Special Weather Statement	PBZ	Fayette	32 min
Jun 21, 7:23 PM EDT	Flash Flood Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	3 hr
Jun 21, 7:46 PM EDT	Areal Flood Warning	PBZ	Fayette, Greene, Washington, Westmoreland	3 hr
Jun 21, 1:24 PM EDT	Special Weather Statement	PBZ	Marion	36 min
Jun 21, 1:51 PM EDT	Special Weather Statement	PBZ	Preston	24 min
Jun 21, 5:05 PM EDT	Areal Flood Advisory	PBZ	Marshall	3 hr
Jun 21, 5:41 PM EDT	Special Weather Statement	PBZ	Marion, Monongalia	34 min
Jun 21, 6:07 PM EDT	Severe Thunderstorm Warning	PBZ	Marion, Monongalia, Preston	23 min
Jun 21, 6:12 PM EDT	Areal Flood Advisory	PBZ	Marshall, Ohio	2 hr
Jun 21, 6:26 PM EDT	Special Weather Statement	PBZ	Preston	34 min
Jun 21, 6:56 PM EDT	Flash Flood Warning	PBZ	Monongalia	2 hr
Jun 21, 1:09 PM EDT	Special Weather Statement	PBZ	Carroll, Columbiana, Coshocton, Tuscarawas	36 min
Jun 21, 1:33 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana, Tuscarawas	27 min
Jun 21, 1:45 PM EDT	Special Weather Statement	PBZ	Carroll, Coshocton, Tuscarawas	30 min
Jun 21, 2:33 PM EDT	Special Weather Statement	PBZ	Harrison, Jefferson	42 min

Nearby

Special Weather Statements in Pennsylvania, 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.