Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 136, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 20, 2008, 8:17 PM EDT for 5 counties in Pennsylvania. It was in force for 58 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
- Jul 20, 2008, 8:17 PM EDT (00:17 UTC)
- Expired
- Jul 20, 2008, 9:15 PM EDT
- In force
- 58 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 122 km from the middle of the area, began a volume at 00:17 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 |
|---|---|---|---|
| Jul 20, 8:25 PM EDT | HAIL 0.25 | Allentown, PA | PEA SIZE HAIL REPORTED IN ALLENTOWN. |
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 00:00Z, 0.3 hours before the alert went out and 187 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
- 143 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1969 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 210018
SVRPHI
PAC011-017-029-077-091-210115-
/O.NEW.KPHI.SV.W.0136.080721T0017Z-080721T0115Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
817 PM EDT SUN JUL 20 2008
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
WEST CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
WESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 915 PM EDT
* AT 811 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 ALLENTOWN TO 13 MILES WEST OF
PARKESBURG...OR ALONG A LINE EXTENDING FROM BETHLEHEM TO 9 MILES
EAST OF LANCASTER...AND MOVING EAST AT 27 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
ZIONSVILLE AND HONEY BROOK BY 825 PM...
GILBERTSVILLE AND ELVERSON BY 830 PM...
GERYVILLE...CEDARVILLE...POTTSTOWN AND EAST GREENVILLE BY 835 PM...
GLENMOORE AND PARKESBURG BY 840 PM...
THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
LAT...LON 3997 7600 4004 7595 4010 7595 4014 7590
4021 7600 4065 7551 4039 7515 3991 7564
3994 7600 3996 7600
TIME...MOT...LOC 0017Z 276DEG 24KT 4064 7539 4002 7609
$$
EBERWINE1 follow-up statement
000
WWUS51 KPHI 210107
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
907 PM EDT SUN JUL 20 2008
PAC011-077-210117-
/O.CAN.KPHI.SV.W.0136.000000T0000Z-080721T0115Z/
BERKS PA-LEHIGH PA-
907 PM EDT SUN JUL 20 2008
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEHIGH AND
SOUTHEASTERN BERKS COUNTIES IS CANCELLED...
LAT...LON 4006 7586 4009 7588 4012 7587 4012 7585
4021 7574 4051 7537 4052 7535 4049 7529
4039 7515 3991 7564 4000 7585 3997 7600
TIME...MOT...LOC 0107Z 276DEG 24KT 4060 7495 3999 7566
$$
PAC017-029-091-210115-
/O.CON.KPHI.SV.W.0136.000000T0000Z-080721T0115Z/
CHESTER PA-MONTGOMERY PA-BUCKS PA-
907 PM EDT SUN JUL 20 2008
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR WEST CENTRAL BUCKS...WESTERN MONTGOMERY AND NORTHERN CHESTER
COUNTIES...
AT 904 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE 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 20 MILES NORTHEAST OF DUBLIN
TO DOWNINGTOWN...OR ALONG A LINE EXTENDING FROM 14 MILES EAST OF
EASTON TO WEST CHESTER...MOVING EAST AT 28 MPH.
LAT...LON 4006 7586 4009 7588 4012 7587 4012 7585
4021 7574 4051 7537 4052 7535 4049 7529
4039 7515 3991 7564 4000 7585 3997 7600
TIME...MOT...LOC 0107Z 276DEG 24KT 4060 7495 3999 7566
$$
EBERWINEThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:48 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 42 min |
| Jul 20, 9:22 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 23 min |
| Jul 20, 9:29 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery | 32 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2008Every severe thunderstorm warning in 2008
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.