Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 249, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Aug 18, 2021, 6:13 PM EDT for 6 counties in Pennsylvania. It was in force for 47 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
- Aug 18, 2021, 6:13 PM EDT (22:13 UTC)
- Expired
- Aug 18, 2021, 7:00 PM EDT
- In force
- 47 min
- Issued by
- NWS State College, PA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Adams County, PA, Cumberland County, PA, Dauphin County, PA, Lancaster County, PA, Perry County, PA, York County, PA
The radar
The Sterling radar (KLWX), 127 km from the middle of the area, began a volume at 22:12 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 18, 11:37 AM EDT | Tornado Watch | SPC | 11 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 127 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
- 1011 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 592 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.6
The text
As transmitted.
670
WUUS51 KCTP 182213
SVRCTP
PAC001-041-043-071-099-133-182300-
/O.NEW.KCTP.SV.W.0249.210818T2213Z-210818T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
613 PM EDT Wed Aug 18 2021
The National Weather Service in State College PA has issued a
* Severe Thunderstorm Warning for...
West central Lancaster County in south central Pennsylvania...
Eastern Adams County in south central Pennsylvania...
York County in south central Pennsylvania...
Southern Dauphin County in south central Pennsylvania...
Northeastern Cumberland County in south central Pennsylvania...
East central Perry County in south central Pennsylvania...
* Until 700 PM EDT.
* At 612 PM EDT, severe thunderstorms were located along a line
extending from near Shermansdale to Hogestown to near Dillsburg to
near Lake Meade to Hampton to near McSherrystown to near Lake
Heritage to Emmitsburg, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Hanover, Mechanicsburg, Camp Hill, East Berlin, Shiremanstown,
Siddonsburg, Wertzville, Hogestown, Dillsburg and New Kingstown
around 620 PM EDT.
New Cumberland, Lemoyne, Steelton, Enola, Lower Allen, Harrisburg,
Progress, Marysville, Rockville and Penbrook around 630 PM EDT.
Middletown, Linglestown, Parkville, York, Hummelstown, Colonial
Park, Weigelstown, West York, Shiloh and Royalton around 640 PM
EDT.
Hershey, Dallastown, Spry, Elizabethtown, Codorus,
Stonybrook-Wilshire, Yorklyn, Skyline View, Yoe and Jacobus around
650 PM EDT.
Other locations impacted by these severe thunderstorms include York
Haven, Three Mile Island, Dauphin, Glenville, Loganville, New Salem,
Lewisberry, Goldsboro, Newberrytown and Seven Valleys.
This includes the following Interstates...
The Pennsylvania Turnpike from mile markers 227 to 258.
Interstate 81 from mile markers 51 to 81.
Interstate 83 from mile markers 0 to 50.
Interstate 283 from mile markers 0 to 2.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM EDT for south central
Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3979 7715 4014 7712 4021 7714 4035 7726
4050 7669 4022 7658 4010 7658 3983 7653
3972 7657 3972 7731
TIME...MOT...LOC 2212Z 257DEG 30KT 4031 7712 4023 7705 4016 7703 4005
7704 3992 7706 3981 7706 3974 7722 3972 7733
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JurewiczThe office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 9:50 AM EDT | Special Weather Statement | CTP | Bedford | 55 min |
| Aug 18, 10:25 AM EDT | Areal Flood Advisory | CTP | Bedford | 3 hr |
| Aug 18, 10:32 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair | 43 min |
| Aug 18, 10:53 AM EDT | Special Weather Statement | CTP | Cambria | 37 min |
| Aug 18, 10:57 AM EDT | Special Weather Statement | CTP | Bedford | 18 min |
| Aug 18, 11:15 AM EDT | Special Weather Statement | CTP | Blair, Cambria | 30 min |
| Aug 18, 11:33 AM EDT | Areal Flood Advisory | CTP | Blair, Cambria | 3 hr |
| Aug 18, 12:04 PM EDT | Areal Flood Advisory | CTP | Bedford | 2 hr |
| Aug 18, 12:11 PM EDT | Special Weather Statement | CTP | Blair | 34 min |
| Aug 18, 12:26 PM EDT | Special Weather Statement | CTP | Schuylkill | 34 min |
| Aug 18, 12:35 PM EDT | Flash Flood Warning | CTP | Bedford, Blair, Huntingdon | 3 hr |
| Aug 18, 12:39 PM EDT | Special Weather Statement | CTP | Cumberland | 36 min |
| Aug 18, 12:54 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Perry | 36 min |
| Aug 18, 1:01 PM EDT | Special Weather Statement | CTP | Huntingdon | 44 min |
| Aug 18, 1:15 PM EDT | Special Weather Statement | CTP | Juniata, Mifflin | 30 min |
| Aug 18, 1:31 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry | 44 min |
| Aug 18, 1:37 PM EDT | Flash Flood Warning | CTP | Blair, Centre, Huntingdon | 82 min |
| Aug 18, 2:00 PM EDT | Special Weather Statement | CTP | Snyder | 30 min |
| Aug 18, 2:02 PM EDT | Tornado Warning | CTP | Centre, Huntingdon | 28 min |
| Aug 18, 2:12 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 33 min |
| Aug 18, 2:26 PM EDT | Special Weather Statement | CTP | Cumberland, Perry | 34 min |
| Aug 18, 2:29 PM EDT | Special Weather Statement | CTP | Centre | 31 min |
| Aug 18, 2:36 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Perry | 39 min |
| Aug 18, 3:03 PM EDT | Special Weather Statement | CTP | Cumberland | 42 min |
| Aug 18, 3:10 PM EDT | Tornado Warning | CTP | Adams, York | 40 min |
| Aug 18, 3:17 PM EDT | Areal Flood Warning | CTP | Bedford, Blair, Huntingdon | 118 min |
| Aug 18, 3:36 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lancaster, York | 24 min |
| Aug 18, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry, Snyder | 34 min |
| Aug 18, 4:03 PM EDT | Special Weather Statement | CTP | Dauphin | 42 min |
| Aug 18, 4:05 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton | 40 min |
| Aug 18, 4:30 PM EDT | Areal Flood Advisory | CTP | Juniata, Perry, Snyder | 4 hr |
| Aug 18, 4:30 PM EDT | Special Weather Statement | CTP | Snyder | 30 min |
| Aug 18, 4:39 PM EDT | Severe Thunderstorm Warning | CTP | Franklin | 36 min |
| Aug 18, 4:42 PM EDT | Areal Flood Advisory | CTP | Fulton, Huntingdon | 2 hr |
| Aug 18, 4:48 PM EDT | Areal Flood Advisory | CTP | Cameron, Clinton, Lycoming, Potter, Tioga | 5 hr |
| Aug 18, 5:10 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Franklin, Perry, York | 35 min |
| Aug 18, 5:18 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin | 45 min |
| Aug 18, 5:31 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin | 74 min |
| Aug 18, 5:35 PM EDT | Special Weather Statement | CTP | Lancaster | 25 min |
| Aug 18, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 40 min |
| Aug 18, 5:38 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, York | 37 min |
| Aug 18, 6:37 PM EDT | Areal Flood Advisory | CTP | Adams, Cumberland, Franklin, York | 2 hr |
| Aug 18, 6:47 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Dauphin, Lancaster, Lebanon, Schuylkill, York | 43 min |
| Aug 18, 6:56 PM EDT | Special Weather Statement | CTP | Schuylkill | 19 min |
| Aug 18, 7:23 PM EDT | Areal Flood Advisory | CTP | Columbia, Sullivan | 2 hr |
| Aug 18, 7:30 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 45 min |
| Aug 18, 7:37 PM EDT | Flash Flood Warning | CTP | Schuylkill | 2 hr |
| Aug 18, 7:40 PM EDT | Flash Flood Warning | CTP | Dauphin, Lancaster, York | 3 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm warning 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.