Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 264, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Sep 1, 2021, 4:21 PM EDT for Lancaster County, Pennsylvania. It was in force for 39 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
- Sep 1, 2021, 4:21 PM EDT (20:21 UTC)
- Expired
- Sep 1, 2021, 5:00 PM EDT
- In force
- 39 min
- Issued by
- NWS State College, PA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Lancaster County, PA
The radar
The Dover AFB radar (KDOX), 135 km from the middle of the area, began a volume at 20:22 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 |
|---|---|---|---|
| Sep 1, 12:40 PM EDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 hours before the alert went out and 161 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
- 558 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 575 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted.
461
WUUS51 KCTP 012021
SVRCTP
PAC071-012100-
/O.NEW.KCTP.SV.W.0264.210901T2021Z-210901T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
421 PM EDT Wed Sep 1 2021
The National Weather Service in State College PA has issued a
* Severe Thunderstorm Warning for...
Eastern Lancaster County in south central Pennsylvania...
* Until 500 PM EDT.
* At 421 PM EDT, a severe thunderstorm was located over Homeville,
moving northeast at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Ephrata, Willow Street, New Holland, Leola, Paradise, Reamstown,
Strasburg, Quarryville, Gap, Adamstown, Terre Hill, Churchtown,
Leacock, Bareville, Smithville, Bowmansville, Lampeter,
Intercourse, Christiana and Fivepointville.
This includes The Pennsylvania Turnpike from mile markers 285 to 295.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM EDT for south central
Pennsylvania.
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
Very heavy rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
A Tornado Watch remains in effect until 1000 PM EDT for south central
Pennsylvania.
&&
LAT...LON 3995 7632 4027 7608 4014 7587 4010 7594
4004 7594 3997 7599 3993 7600 3987 7599
3987 7600 3985 7602 3983 7602 3982 7604
3981 7603 3978 7606
TIME...MOT...LOC 2021Z 204DEG 41KT 3989 7600
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
ColbertThe office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 8:54 AM EDT | Flash Flood Warning | CTP | Bedford, Blair, Cambria, Centre, Clearfield, Fulton and 3 more | 8 hr |
| Sep 1, 9:37 AM EDT | Flash Flood Warning | CTP | Cambria, Clearfield, Somerset | 6 hr |
| Sep 1, 9:45 AM EDT | Areal Flood Advisory | CTP | Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata and 10 more | 2 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Snyder, Union | 17 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Cambria | 17 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Huntingdon | 23 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Juniata, Mifflin | 20 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Bedford, Huntingdon | 30 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Dauphin | 55 hr |
| Sep 1, 12:04 PM EDT | Flash Flood Warning | CTP | Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata and 10 more | 6 hr |
| Sep 1, 1:09 PM EDT | Flash Flood Warning | CTP | Cambria | 5 hr |
| Sep 1, 2:07 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 53 min |
| Sep 1, 2:28 PM EDT | Severe Thunderstorm Warning | CTP | York | 77 min |
| Sep 1, 3:05 PM EDT | Tornado Warning | CTP | York | 23 min |
| Sep 1, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 35 min |
| Sep 1, 3:34 PM EDT | Areal Flood Warning | CTP | Cambria, Clearfield, Somerset | 6 hr |
| Sep 1, 4:24 PM EDT | Flash Flood Warning | CTP | Adams, York | 4 hr |
| Sep 1, 4:40 PM EDT | Areal Flood Warning | CTP | Bedford, Blair, Cambria, Centre, Clearfield, Franklin and 4 more | 6 hr |
| Sep 1, 5:41 PM EDT | Areal Flood Warning | CTP | Adams, Centre, Columbia, Cumberland, Dauphin, Franklin and 15 more | 14 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.