Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 76
The Storm Prediction Center issued this severe thunderstorm watch at Mar 29, 2020, 12:05 PM EDT for 12 counties in New York; 4 counties in Ohio; 18 counties in Pennsylvania. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 29, 2020, 12:05 PM EDT (16:05 UTC)
- Expired
- Mar 29, 2020, 4:29 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 34 counties
Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Ontario County, NY, Orleans County, NY, Wayne County, NY, Wyoming County, NY, Ashtabula County, OH, Columbiana County, OH, Mahoning County, OH, Trumbull County, OH, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cameron County, PA, Clarion County, PA, Clearfield County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Potter County, PA, Venango County, PA, Warren County, PA
The radar
The Buffalo radar (KBUF), 76 km from the middle of the area, began a volume at 16:07 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 1:18 PM EDT | Severe Thunderstorm Warning | CLE | Erie | 25 min |
| Mar 29, 1:24 PM EDT | Severe Thunderstorm Warning | BUF | Cattaraugus, Chautauqua, Erie, Niagara | 66 min |
| Mar 29, 2:03 PM EDT | Severe Thunderstorm Warning | BUF | Erie, Genesee, Niagara, Orleans, Wyoming | 57 min |
| Mar 29, 2:41 PM EDT | Severe Thunderstorm Warning | BUF | Genesee, Livingston, Monroe, Ontario | 64 min |
| Mar 29, 2:56 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, McKean, Potter | 49 min |
| Mar 29, 3:10 PM EDT | Severe Thunderstorm Warning | BUF | Genesee, Livingston, Ontario, Wyoming | 50 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 4.1 hours before the alert went out and 73 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1264 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 288 m²/s²
- 0-3 km storm-relative helicity
- 343 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 10:58 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 4 more | 2 hr |
| Mar 29, 2:21 PM EDT | Mesoscale Discussion | SPC | Allegany, Cayuga, Genesee, Jefferson, Livingston, Monroe and 9 more | 84 min |
| Mar 28, 10:23 PM EDT | Mesoscale Discussion | SPC | Auglaize, Butler, Champaign, Clark, Darke, Greene and 8 more | 97 min |
| Mar 28, 11:34 PM EDT | Mesoscale Discussion | SPC | Brown, Clermont, Hamilton | 86 min |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2020Severe Thunderstorm Watches in New York, 2020Severe Thunderstorm Watches in Ohio, 2020Every severe thunderstorm watch in 2020
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.