Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 29, 2009, 4:41 PM EDT for Berks County, Pennsylvania. It was in force for 94 min. 5 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
- Mar 29, 2009, 4:41 PM EDT (20:41 UTC)
- Expired
- Mar 29, 2009, 6:15 PM EDT
- In force
- 94 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Berks County, PA
The radar
The Philadelphia radar (KDIX), 158 km from the middle of the area, began a volume at 20:41 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 |
|---|---|---|---|
| Mar 29, 5:10 PM EDT | HAIL 0.88 | West Lawn, PA | MARBLE TO PENNY SIZE HAIL REPORTED IN WEST LAWN. |
| Mar 29, 5:15 PM EDT | HAIL 1 | Reading, PA | QUARTER SIZE HAIL REPORTED IN READING |
| Mar 29, 5:16 PM EDT | TSTM WND GST 54 | Reading, PA | 54 MPH WIND GUST MEASURED AT THE READING AIRPORT. |
| Mar 29, 5:25 PM EDT | HAIL 1 | Fleetwood, PA | NICKEL TO QUARTER SIZE HAIL REPORTED IN FLEETWOOD, SHILLINGTON AND BLANDON. |
| Mar 29, 5:30 PM EDT | TSTM WND DMG | 7 Ese Laureldale, PA | DAMAGE WAS REPORTED AT A FARM IN OLEY TOWNSHIP. ROOF, SIDING AND WINDOW DAMAGE REPORTED TO THE FARMHOUSE WITH SIGNIFICANT DAMAGE TO 2 BARNS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.7 hours before the alert went out and 204 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 491 m above ground
- 0-6 km bulk shear
- 79 kt
- 0-1 km storm-relative helicity
- 246 m²/s²
- 0-3 km storm-relative helicity
- 225 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 292041
SVRPHI
PAC011-292215-
/O.NEW.KPHI.SV.W.0001.090329T2041Z-090329T2215Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
441 PM EDT SUN MAR 29 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
BERKS COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF READING...
* UNTIL 615 PM EDT
* AT 439 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED 15 MILES SOUTHWEST OF WOMELSDORF...OR 10 MILES
NORTH OF LANCASTER...AND MOVING NORTHEAST AT 30 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
WOMELSDORF BY 505 PM EDT...
WERNERSVILLE BY 510 PM EDT...
READING BY 525 PM EDT...
LEESPORT BY 530 PM EDT...
FLEETWOOD BY 540 PM EDT...
KUTZTOWN BY 550 PM EDT...
ADDITIONAL THUNDERSTORMS WERE LOCATED OVER THE NORTHWEST PART OF
BERKS COUNTY AND THESE WERE ALSO MOVING EAST INTO BERKS COUNTY.
THESE THUNDERSTORMS ARE ALSO CAPABLE OF PRODUCING HAIL.
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.
&&
LAT...LON 4049 7643 4053 7632 4052 7630 4054 7618
4056 7615 4058 7609 4060 7605 4059 7603
4064 7601 4068 7590 4044 7554 4015 7591
4036 7621 4036 7624
TIME...MOT...LOC 2040Z 231DEG 27KT 4018 7631
$$
RNSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 4:58 PM EDT | Tornado Warning | PHI | Berks | 62 min |
| Mar 29, 5:11 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh | 64 min |
| Mar 29, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 63 min |
| Mar 29, 5:55 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Lehigh, Montgomery, Northampton | 50 min |
| Mar 29, 6:11 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 64 min |
| Mar 29, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 51 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.