Alert archive / Pennsylvania / Special Weather Statements in 2021
Special Weather Statement, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this special weather statement at Jul 12, 2021, 7:01 PM EDT for Lawrence County, Pennsylvania. It was in force for 29 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 12, 2021, 7:01 PM EDT (23:01 UTC)
- Expired
- Jul 12, 2021, 7:30 PM EDT
- In force
- 29 min
- Issued by
- NWS Pittsburgh, PA
County Lawrence County, PA
The radar
The Pittsburgh radar (KPBZ), 52 km from the middle of the area, began a volume at 23:04 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 12:00Z, 11.0 hours before the alert went out and 65 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
- 173 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 12, 4:41 PM EDT, 2 hours 20 minutes earlier.
Area forecast discussion, Jul 12, 4:41 PM EDT, 2 hours 20 minutes before
Area Forecast Discussion National Weather Service Pittsburgh PA 441 PM EDT Mon Jul 12 2021 .SYNOPSIS... Warm and humid conditions will linger through the week along with daily shower and thunderstorm chance. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... No major changes were needed for the eve update as warm, moist advection continues in sw flow aloft. That flow, on the wrn periphery of a wrn Atlantic/E Coast ridge, will continue to support isold to sct convection this aftn and eve as weak shrtwv ripples move through the flow. Better coverage can still be expected from the I 80 corridor and nwd where a warm front is indicated extending frm Great Lakes low pres. The svr potential rmns limited to some possible isold wind gusts as only pockets of mid level dry air may cause sufficient evaporative cooling to initiate a downbursts. Otherwise, very lazy updrafts are indicated with very warm air in the mid lvls and minimal deep layer shear. Furthermore, flow is sufficient to move convection fast enough to offset warm rain processes resulting from that same mid lvl warmth. No change in airmass should be expected ovrngt. Warmth and humidity will continue. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/... A closed upper low, currently over Missouri, will begin to fill and lift towards the Great Lakes tonight and into Tuesday. In response, the ridge on the Atlantic Seaboard will strengthen a bit, which will also edge the frontal boundary further north into Michigan and New York State. This will push the deeper moisture north of our region. Enough instability will remain in place for scattered showers and storms in the afternoon and evening, but with a slightly drier air mass and continued weakish flow, any severe or flooding threat looks to be a bit lower than today. High temperatures may creep a degree or two higher. For Tuesday night and Wednesday, that Great Lakes shortwave, followed by another quickly on its heels, will cross the region through Wednesday. This will return good shower and thunderstorm chances to the region. However, with destabilization appearing muted and with generally unimpressive shear, the severe weather threat remains low. Also, precipitable water values will be a bit lower as compared to today. Along with this, storm motion should be sufficient to keep any heavy rain/flood threat low. The clouds and rain will help to cool high temperatures to either side of 80 degrees. Quieter weather returns Wednesday night behind the second shortwave. && .LONG TERM /THURSDAY THROUGH MONDAY/... Overall, warm and humid conditions will continue into the upcoming weekend with 500mb heights remaining seasonably high. Daytime temperatures may be tempered by periods of clouds/rain. Thursday may end up being the quietest day of the week. The mid- level ridge appears to reach its greatest strength over our region on that day, and surface high pressure will also be present. This quiet period could last into Friday morning. Thereafter, the next trough will arrive in the Great Lakes/Ohio Valley region, with a slow-moving surface boundary in the area into the weekend at least. While strength and timing details differ among the models, it does appear that decent rain chances will need to remain in the forecast from Friday night through the weekend, with drier and slightly cooler weather perhaps arriving by Monday. && .AVIATION /21Z MONDAY THROUGH SATURDAY/... Isolated to scattered showers and storms possible this eve, particularly ports north and west of PIT closer to the edge of ridging over the region. .Outlook... Periodic restrictions with showers and storms, mainly during the afternoon and evening hours, will be possible through the week. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. &&
Hazardous weather outlook, Jul 12, 3:43 AM EDT, 15 hours 18 minutes before
Hazardous Weather Outlook National Weather Service Pittsburgh PA 343 AM EDT Mon Jul 12 2021 OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029- 031-073>076-WVZ001>004-012-021-509>514-130745- 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- 343 AM EDT Mon Jul 12 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. Isolated severe storms are possible today. Damaging wind gusts are the main threat. Any storms will produce heavy downpours which could lead to localized flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Isolated severe storms are possible Tuesday. Damaging wind gusts are the main threat. Any storms will produce heavy downpours which could lead to localized flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Special weather statement, Jul 12, 7:01 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
701 PM EDT Mon Jul 12 2021
PAZ007-013-014-122330-
Butler-Lawrence-Mercer-
701 PM EDT Mon Jul 12 2021
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT
SOUTHEASTERN MERCER...EASTERN LAWRENCE AND NORTHWESTERN BUTLER
COUNTIES...
At 700 PM EDT, a strong thunderstorm was located near Ellwood City,
or near New Castle, moving northeast at 15 mph.
Wind gusts up to 45 mph are possible with this storm.
Locations impacted include...
Slippery Rock... Harrisville...
Plain Grove Township... West Liberty...
Harlansburg... Portersville...
Moraine State Park... McConnells Mill...
Rose Point Park... Cooper's Lake Campground...
This includes Interstate 79 in Pennsylvania between mile markers 98
and 113.
LAT...LON 4089 8023 4096 8030 4114 8015 4113 7995
4098 7994
TIME...MOT...LOC 2300Z 225DEG 12KT 4094 8023The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 7:55 PM EDT | Special Weather Statement | PBZ | Venango | 35 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.