Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 261, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Sep 1, 2021, 2:07 PM EDT for Adams County, Pennsylvania. It was in force for 53 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 1, 2021, 2:07 PM EDT (18:07 UTC)
- Expired
- Sep 1, 2021, 3:00 PM EDT
- In force
- 53 min
- Issued by
- NWS State College, PA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Adams County, PA
The radar
The Sterling radar (KLWX), 107 km from the middle of the area, began a volume at 18:10 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 1, 2:34 PM EDT | TSTM WND DMG | 1 Nw York Springs, PA | MULTIPLE TREES AND WIRES DOWN ON THE 11000 BLOCK OF CARLISLE PIKE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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, 6.1 hours before the alert went out and 108 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.
103
WUUS51 KCTP 011807
SVRCTP
PAC001-011900-
/O.NEW.KCTP.SV.W.0261.210901T1807Z-210901T1900Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
207 PM EDT Wed Sep 1 2021
The National Weather Service in State College PA has issued a
* Severe Thunderstorm Warning for...
Adams County in south central Pennsylvania...
* Until 300 PM EDT.
* At 207 PM EDT, a severe thunderstorm was located over Bonneauville,
moving northeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Hanover, Gettysburg, Hampton, Littlestown, McSherrystown, Lake
Meade, Bonneauville, New Oxford, East Berlin, Lake Heritage,
Cashtown, Aspers, Orrtanna, Biglerville, Abbottstown, Arendtsville,
York Springs, Heidlersburg, Bendersville and Hunterstown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3979 7734 3987 7737 3996 7734 4002 7729
4003 7719 4007 7712 4003 7707 4001 7702
3994 7697 3989 7698 3986 7696 3983 7700
3972 7700 3972 7728
TIME...MOT...LOC 1807Z 217DEG 23KT 3981 7716
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, 2:28 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, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 39 min |
| 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.