Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 271, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 27, 2021, 2:32 PM EDT for Carbon County, Monroe County, Northampton County, Pennsylvania. It was in force for 28 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
- Aug 27, 2021, 2:32 PM EDT (18:32 UTC)
- Expired
- Aug 27, 2021, 3:00 PM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Carbon County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 18:34 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 |
|---|---|---|---|
| Aug 27, 2:34 PM EDT | TSTM WND DMG | 2 Ssw Gilbert, PA | DOWNED TREE LIMBS AND WIRES NEAR BLACKBERRY LANE. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.5 hours before the alert went out and 207 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
- 1159 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1043 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
720
WUUS51 KPHI 271832
SVRPHI
PAC025-089-095-271915-
/O.NEW.KPHI.SV.W.0271.210827T1832Z-210827T1915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
232 PM EDT Fri Aug 27 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
East central Carbon County in northeastern Pennsylvania...
Southwestern Monroe County in northeastern Pennsylvania...
Central Northampton County in eastern Pennsylvania...
* Until 315 PM EDT.
* At 232 PM EDT, a severe thunderstorm was located over Rossland, or
14 miles northwest of Easton, and is nearly stationary.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Easton, East Stroudsburg, Nazareth, Bangor, Pen Argyl, Wind Gap,
Belfast, Tatamy, East Bangor, Stormville, Brodheadsville,
Kunkletown, Gilbert, Delaware Water Gap, Rossland, Kresgeville,
Saylorsburg, Penn Forest Reservoir, Stroudsburg and Roseto.
This includes the following highways...
Interstate 80 in Pennsylvania between mile markers 308 and 314.
Interstate 80 in New Jersey near mile marker 0.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to damaging winds, frequent cloud to ground lightning is
occurring with this storm. Move indoors immediately. Remember, if
you can hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4101 7512 4070 7521 4081 7557 4093 7562
TIME...MOT...LOC 1832Z 266DEG 2KT 4085 7539
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse2 follow-up statements
303
WWUS51 KPHI 271847
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
247 PM EDT Fri Aug 27 2021
PAC025-271856-
/O.CAN.KPHI.SV.W.0271.000000T0000Z-210827T1915Z/
Carbon PA-
247 PM EDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CARBON COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning looks to remain
out of this portion of the warned area. Therefore, the warning has
been cancelled.
LAT...LON 4101 7512 4070 7521 4078 7549 4094 7547
TIME...MOT...LOC 1846Z 264DEG 8KT 4086 7531
$$
PAC089-095-271915-
/O.CON.KPHI.SV.W.0271.000000T0000Z-210827T1915Z/
Monroe PA-Northampton PA-
247 PM EDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR SOUTH CENTRAL MONROE AND CENTRAL NORTHAMPTON COUNTIES...
At 246 PM EDT, a severe thunderstorm was located over Wind Gap, or 12
miles north of Easton, moving east at 10 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Easton, East Stroudsburg, Nazareth, Bangor, Pen Argyl, Wind Gap,
Belfast, Tatamy, East Bangor, Stormville, Brodheadsville, Kunkletown,
Saylorsburg, Gilbert, Delaware Water Gap, Rossland, Stroudsburg,
Roseto, Stockertown and Chapman.
This includes the following highways...
Interstate 80 in Pennsylvania between mile markers 309 and 314.
Interstate 80 in New Jersey near mile marker 0.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4101 7512 4070 7521 4078 7549 4094 7547
TIME...MOT...LOC 1846Z 264DEG 8KT 4086 7531
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse587
WWUS51 KPHI 271900
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
300 PM EDT Fri Aug 27 2021
PAC089-095-271910-
/O.CAN.KPHI.SV.W.0271.000000T0000Z-210827T1915Z/
Monroe PA-Northampton PA-
300 PM EDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONROE AND
CENTRAL NORTHAMPTON COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 4101 7512 4070 7521 4078 7549 4094 7547
TIME...MOT...LOC 1858Z 266DEG 2KT 4086 7530
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 1:20 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 2 hr |
| Aug 27, 1:33 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 83 min |
| Aug 27, 1:36 PM EDT | Special Weather Statement | PHI | Monroe | 24 min |
| Aug 27, 1:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 53 min |
| Aug 27, 2:12 PM EDT | Special Weather Statement | PHI | Northampton | 33 min |
| Aug 27, 2:18 PM EDT | Areal Flood Advisory | PHI | Chester | 93 min |
| Aug 27, 2:33 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe, Northampton | 109 min |
| Aug 27, 2:42 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 14 min |
| Aug 27, 3:07 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 24 min |
| Aug 27, 3:44 PM EDT | Special Weather Statement | PHI | Delaware | 31 min |
| Aug 27, 5:29 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 3 hr |
| Aug 27, 6:29 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 27, 6:41 PM EDT | Special Weather Statement | PHI | Berks | 34 min |
| Aug 27, 7:17 PM EDT | Flash Flood Warning | PHI | Berks | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.