Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 214, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 2009, 1:29 PM EDT for 4 counties in Pennsylvania. It was in force for 76 min. 2 reports 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 21, 2009, 1:29 PM EDT (17:29 UTC)
- Expired
- Aug 21, 2009, 2:45 PM EDT
- In force
- 76 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 17:31 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 21, 1:30 PM EDT | TSTM WND DMG | 4 Sw Beltzville State P, PA | TREES DOWN IN MAHONING, FRANKLIN, AND TOWAMENSING TWPS. |
| Aug 21, 2:15 PM EDT | TSTM WND DMG | 1 Ssw Emerald, PA | TREE LIMBS AND WIRES DOWN IN WASHINGTON AND UPPER SAUCON TWPS. |
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 |
|---|---|---|---|
| Aug 21, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.5 hours before the alert went out and 155 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
- 96 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 930 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 211729
SVRPHI
PAC025-077-089-095-211845-
/O.NEW.KPHI.SV.W.0214.090821T1729Z-090821T1845Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
129 PM EDT FRI AUG 21 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
SOUTHEASTERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF LEHIGHTON...
SOUTHERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
* UNTIL 245 PM EDT
* AT 128 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
NEW TRIPOLI...OR 14 MILES SOUTH OF LEHIGHTON...AND MOVING NORTHEAST
AT 25 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
NEW TRIPOLI AROUND 135 PM EDT...
JORDAN VALLEY AROUND 140 PM EDT...
JORDAN VALLEY AROUND 145 PM EDT...
NEFFS AND SCHNECKSVILLE AROUND 150 PM EDT...
WALNUTPORT...SLATINGTON AND EMERALD AROUND 155 PM EDT...
PALMERTON AROUND 200 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 4087 7507 4052 7563 4069 7587 4074 7578
4079 7585 4106 7532
TIME...MOT...LOC 1729Z 235DEG 24KT 4064 7579
$$
NIERENBERG1 follow-up statement
000
WWUS51 KPHI 211832
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
232 PM EDT FRI AUG 21 2009
PAC025-077-211842-
/O.CAN.KPHI.SV.W.0214.000000T0000Z-090821T1845Z/
LEHIGH PA-CARBON PA-
232 PM EDT FRI AUG 21 2009
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARBON AND LEHIGH
COUNTIES IS CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY.
LAT...LON 4068 7548 4074 7553 4074 7559 4079 7560
4081 7547 4106 7532 4087 7507 4066 7541
TIME...MOT...LOC 1832Z 235DEG 24KT 4088 7533
$$
PAC089-095-211845-
/O.CON.KPHI.SV.W.0214.000000T0000Z-090821T1845Z/
NORTHAMPTON PA-MONROE PA-
232 PM EDT FRI AUG 21 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTH CENTRAL MONROE AND NORTHAMPTON COUNTIES...
AT 231 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR SAYLORSBURG...OR 15 MILES NORTHWEST OF EASTON...MOVING
NORTHEAST AT 30 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
PEN ARGYL...ROSETO AND BANGOR BY 240 PM EDT...
STORMVILLE...EAST BANGOR AND 8 MILES SOUTHEAST OF REEDERS BY 245 PM
EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY.
&&
LAT...LON 4068 7548 4074 7553 4074 7559 4079 7560
4081 7547 4106 7532 4087 7507 4066 7541
TIME...MOT...LOC 1832Z 235DEG 24KT 4088 7533
$$
NIERENBERGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 12:20 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 55 min |
| Aug 21, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 35 min |
| Aug 21, 1:16 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 59 min |
| Aug 21, 1:52 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 68 min |
| Aug 21, 1:55 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 65 min |
| Aug 21, 2:41 PM EDT | Areal Flood Advisory | PHI | Monroe, Northampton | 3 hr |
| Aug 21, 2:47 PM EDT | Flash Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 35 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009
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.