Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 35, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2009, 3:28 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 62 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
- May 29, 2009, 3:28 PM EDT (19:28 UTC)
- Expired
- May 29, 2009, 4:30 PM EDT
- In force
- 62 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Chester County, PA
The radar
The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 19:29 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 |
|---|---|---|---|
| May 29, 3:57 PM EDT | TSTM WND DMG | 2 N Parkesburg, PA | TREE LIMBS REPORTED DOWN IN SADSBURY. |
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 |
|---|---|---|---|
| May 29, 1:26 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.5 hours before the alert went out and 68 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
- 4 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 291928
SVRPHI
PAC011-029-292045-
/O.NEW.KPHI.SV.W.0035.090529T1928Z-090529T2045Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
328 PM EDT FRI MAY 29 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EXTREME SOUTH CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
NORTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 445 PM EDT
* AT 323 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 18
MILES WEST OF HONEY BROOK...OR NEAR LANCASTER...AND MOVING EAST AT
25 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
HONEY BROOK AROUND 405 PM EDT...
COATESVILLE AROUND 415 PM EDT...
GLENMOORE AROUND 420 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.
&&
LAT...LON 4002 7597 4003 7595 4011 7595 4014 7590
4017 7594 4018 7594 4021 7571 3990 7570
3992 7600 3996 7600
TIME...MOT...LOC 1926Z 270DEG 22KT 4004 7622
$$
KRUZDLO1 follow-up statement
000
WWUS51 KPHI 292030
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
430 PM EDT FRI MAY 29 2009
PAC011-029-292040-
/O.CAN.KPHI.SV.W.0035.000000T0000Z-090529T2045Z/
CHESTER PA-BERKS PA-
430 PM EDT FRI MAY 29 2009
...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTH CENTRAL BERKS
AND NORTHWESTERN CHESTER COUNTIES IS CANCELLED...
STORMS HAVE MOVED OUT OF THE AREA. A SEVERE THUNDERSTORM WATCH
REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY EVENING FOR DELAWARE AND
NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.
LAT...LON 4002 7597 4003 7595 4011 7595 4014 7590
4017 7594 4018 7594 4021 7571 3990 7570
3992 7600 3996 7600
TIME...MOT...LOC 2030Z 270DEG 22KT 4004 7571
$$
JJM/MPDThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 3:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 67 min |
| May 29, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 42 min |
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.