Alert archive / Pennsylvania / Special Weather Statements in 2021
Special Weather Statement, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this special weather statement at Jul 20, 2021, 9:39 PM EDT for Armstrong County, Pennsylvania. 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, 9:39 PM EDT (01:39 UTC)
- Expired
- Jul 20, 2021, 10:15 PM EDT
- In force
- 36 min
- Issued by
- NWS Pittsburgh, PA
County Armstrong County, PA
The radar
The Pittsburgh radar (KPBZ), 78 km from the middle of the area, began a volume at 01:42 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, 1.7 hours before the alert went out and 77 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.
- 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
The text
As transmitted.
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</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 Pittsburgh, PA wrote its last area forecast discussion before this special weather statement went out at Jul 20, 7:19 PM EDT, 2 hours 20 minutes earlier.
Area forecast discussion, Jul 20, 7:19 PM EDT, 2 hours 20 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, 18 hours 20 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, 9:11 PM EDT, 28 minutes before
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</html>Special weather statement, Jul 20, 9:16 PM EDT, 23 minutes before
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</html>Local storm report, Jul 20, 9:25 PM EDT, 14 minutes before
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</html>Local storm report, Jul 20, 9:33 PM EDT, 6 minutes before
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</html>Special weather statement, Jul 20, 9:38 PM EDT, 1 minute before
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</html>Special weather statement, Jul 20, 9:39 PM EDT, 0 minutes before
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</html>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, 8:01 PM EDT | Special Weather Statement | PBZ | Hancock | 29 min |
| Jul 20, 9:09 PM EDT | Special Weather Statement | PBZ | Brooke | 36 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 Pennsylvania, 2021Every 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.