Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 112, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 30, 2009, 2:31 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland. It was in force for 44 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
- Jun 30, 2009, 2:31 PM EDT (18:31 UTC)
- Expired
- Jun 30, 2009, 3:15 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Cecil County, MD, Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Dover AFB radar (KDOX), 117 km from the middle of the area, began a volume at 18:30 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 |
|---|---|---|---|
| Jun 30, 2:42 PM EDT | TSTM WND DMG | 4 Nne Cedarville, PA | TREE DOWN ON WIRES IN UPPER POTTSGROVE |
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 |
|---|---|---|---|
| Jun 30, 11:37 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.5 hours before the alert went out and 39 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
- 161 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1704 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 301831
SVRPHI
MDC015-PAC011-029-091-301915-
/O.NEW.KPHI.SV.W.0112.090630T1831Z-090630T1915Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
231 PM EDT TUE JUN 30 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF READING...
CECIL COUNTY IN NORTHEAST MARYLAND...
THIS INCLUDES THE CITY OF ELKTON...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF WEST CHESTER...
WEST CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 315 PM EDT
* AT 228 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM BIRDSBORO TO 18 MILES SOUTHWEST
OF CHARLESTOWN...OR ALONG A LINE EXTENDING FROM 6 MILES SOUTHEAST
OF READING TO 22 MILES EAST OF BALTIMORE...AND MOVING EAST AT 45
MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
COCHRANVILLE...FARMINGTON...CALVERT AND PARKESBURG AROUND 235 PM
EDT...
GLENMOORE...CEDARVILLE...ZION AND LOMBARD AROUND 240 PM EDT...
GILBERTSVILLE AND PUGHTOWN AROUND 245 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
TUESDAY EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 3975 7610 3987 7601 4011 7595 4014 7590
4023 7602 4036 7597 4037 7567 4015 7529
3974 7580 3938 7579 3938 7603 3941 7605
3945 7600 3946 7602 3956 7598 3955 7609
3972 7623
TIME...MOT...LOC 1830Z 259DEG 41KT 4029 7581 3939 7620
$$
NIERENBERG1 follow-up statement
000
WWUS51 KPHI 301903
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
303 PM EDT TUE JUN 30 2009
PAC011-301913-
/O.CAN.KPHI.SV.W.0112.000000T0000Z-090630T1915Z/
BERKS PA-
303 PM EDT TUE JUN 30 2009
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...
THE LINE OF STORMS HAS MOVED EAST OF THE AREA.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
TUESDAY EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.
LAT...LON 3982 7584 4001 7571 4010 7574 4024 7570
4030 7557 4015 7529 3974 7580 3938 7579
3939 7603 3941 7604 3945 7600 3946 7602
3956 7598 3955 7609 3968 7608 3975 7610
TIME...MOT...LOC 1903Z 259DEG 41KT 4020 7540 3949 7601
$$
MDC015-PAC029-091-301915-
/O.CON.KPHI.SV.W.0112.000000T0000Z-090630T1915Z/
CECIL MD-CHESTER PA-MONTGOMERY PA-
303 PM EDT TUE JUN 30 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR CENTRAL MONTGOMERY...CHESTER AND CECIL COUNTIES...
AT 302 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM EVANSBURG TO 6 MILES WEST OF HOLLYWOOD BEACH...OR
ALONG A LINE EXTENDING FROM 19 MILES NORTHEAST OF WEST CHESTER TO 13
MILES SOUTHWEST OF ELKTON...MOVING EAST AT 45 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
CECILTON...HOLLYWOOD BEACH...WEST NORRITON AND KING OF PRUSSIA BY
310 PM EDT...
CHESAPEAKE CITY...CAYOTS...BRANTWOOD AND NORRISTOWN BY 315 PM
EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT
TUESDAY EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.
IF YOU SEE THREATENING WEATHER, HEAD INDOORS IMMEDIATELY.
&&
LAT...LON 3982 7584 4001 7571 4010 7574 4024 7570
4030 7557 4015 7529 3974 7580 3938 7579
3939 7603 3941 7604 3945 7600 3946 7602
3956 7598 3955 7609 3968 7608 3975 7610
TIME...MOT...LOC 1903Z 259DEG 41KT 4020 7540 3949 7601
$$
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 75 min |
| Jun 30, 2:51 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 54 min |
| Jun 30, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 63 min |
| Jun 30, 3:13 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 114 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2009Severe Thunderstorm Warnings in Maryland, 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.