Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 105, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 12, 2013, 5:47 PM EDT for Chester County, Delaware County, Pennsylvania. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 12, 2013, 5:47 PM EDT (21:47 UTC)
- Expired
- Sep 12, 2013, 6:45 PM EDT
- In force
- 58 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 21:49 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 12, 2:50 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.8 hours before the alert went out and 70 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
- 1009 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 970 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
174
WUUS51 KPHI 122147
SVRPHI
PAC029-045-122245-
/O.NEW.KPHI.SV.W.0105.130912T2147Z-130912T2245Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
547 PM EDT THU SEP 12 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WESTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 645 PM EDT
* AT 545 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM. THE STORM WAS NEAR PARKESBURG...MOVING EAST AT
30 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
COATESVILLE AND WEST GROVE AROUND 555 PM EDT...
GLENMOORE AND KENNETT SQUARE AROUND 605 PM EDT...
DOWNINGTOWN AND MARSHALLTON AROUND 610 PM EDT...
LIONVILLE AROUND 615 PM EDT...
WEST CHESTER AND CHESTER SPRINGS AROUND 620 PM EDT...
WESTTOWN AND ELAM AROUND 625 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE
THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
THURSDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 3988 7599 3991 7601 4013 7591 4014 7589
4016 7553 4015 7552 4016 7550 4014 7551
4013 7547 4009 7546 4009 7542 4006 7539
3980 7541 3984 7551 3984 7562 3981 7570
3981 7605
TIME...MOT...LOC 2147Z 266DEG 25KT 3998 7591
$$
MEOLA2 follow-up statements
080
WWUS51 KPHI 122217
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
617 PM EDT THU SEP 12 2013
PAC029-045-122245-
/O.CON.KPHI.SV.W.0105.000000T0000Z-130912T2245Z/
DELAWARE PA-CHESTER PA-
617 PM EDT THU SEP 12 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR EASTERN CHESTER AND WESTERN DELAWARE COUNTIES...
AT 614 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WEST CHESTER...MOVING
EAST AT 35 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
MALVERN AND PAOLI AROUND 625 PM EDT...
GRADYVILLE AND DEVON-BERWYN AROUND 630 PM EDT...
NEWTOWN SQUARE AND LINWOOD AROUND 635 PM EDT...
LAT...LON 4014 7568 4015 7552 4016 7550 4014 7551
4013 7550 4013 7547 4009 7546 4009 7542
4006 7539 3980 7541 3984 7551 3984 7562
3981 7582
TIME...MOT...LOC 2217Z 268DEG 30KT 3998 7560
$$
FORECASTER: AMC174
WWUS51 KPHI 122232
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
632 PM EDT THU SEP 12 2013
PAC029-045-122241-
/O.CAN.KPHI.SV.W.0105.000000T0000Z-130912T2245Z/
DELAWARE PA-CHESTER PA-
632 PM EDT THU SEP 12 2013
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CHESTER AND WESTERN
DELAWARE COUNTIES IS CANCELLED...
THE STORM HAS WEAKENED TO BELOW SEVERE LIMITS...THEREFORE THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.
LAT...LON 4014 7568 4015 7552 4016 7550 4014 7551
4013 7550 4013 7547 4009 7546 4009 7542
4006 7539 3980 7541 3984 7551 3984 7562
3981 7582
TIME...MOT...LOC 2231Z 268DEG 30KT 3998 7545
$$
FORECASTER: AMCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 7:38 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Sep 12, 2:26 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 64 min |
| Sep 12, 3:43 PM EDT | Special Weather Statement | PHI | Berks | 62 min |
| Sep 12, 4:21 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 84 min |
| Sep 12, 4:40 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more | 95 min |
| Sep 12, 6:07 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 68 min |
| Sep 12, 6:43 PM EDT | Special Weather Statement | PHI | Philadelphia | 62 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2013Every severe thunderstorm warning in 2013
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.