Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 10, 2013, 6:21 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 54 min. 7 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
- Apr 10, 2013, 6:21 PM EDT (22:21 UTC)
- Expired
- Apr 10, 2013, 7:15 PM EDT
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 22:23 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 |
|---|---|---|---|
| Apr 10, 6:30 PM EDT | TSTM WND DMG | Washington Twp, PA | TREES DOWN |
| Apr 10, 6:47 PM EDT | HAIL 0.5 | Allentown, PA | HALF INCH HAIL COVERED HALF OF THE GROUND. |
| Apr 10, 6:50 PM EDT | TSTM WND DMG | 3 Sw Hanover Twp, PA | TREES DOWN |
| Apr 10, 6:50 PM EDT | HAIL 0.62 | Allentown, PA | |
| Apr 10, 6:50 PM EDT | HAIL 0.75 | Allentown, PA | |
| Apr 10, 7:00 PM EDT | HAIL 0.88 | Bethlehem, PA | |
| Apr 10, 7:00 PM EDT | HAIL 1 | Freemansburg, PA | PENNY TO QUARTER SIZE HAIL COVERED THE GROUND. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.4 hours before the alert went out and 160 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
- 1 J/kg
- Mixed-layer CIN
- -437 J/kg
- Mixed-layer LCL
- 1938 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 180 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
485
WUUS51 KPHI 102221
SVRPHI
PAC077-095-102315-
/O.NEW.KPHI.SV.W.0005.130410T2221Z-130410T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
621 PM EDT WED APR 10 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF ALLENTOWN...
NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF EASTON...
* UNTIL 715 PM EDT
* AT 619 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM. THIS STORM WAS LOCATED NEAR JORDAN VALLEY...
OR 7 MILES SOUTH OF LEHIGHTON...AND MOVING EAST AT 35 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
WALNUTPORT...NEFFS AND BERLINSVILLE AROUND 630 PM EDT...
NORTHAMPTON AND DANIELSVILLE AROUND 635 PM EDT...
BEERSVILLE AND NORTHAMPTON AROUND 640 PM EDT...
BATH AROUND 645 PM EDT...
STEUBEN AROUND 650 PM EDT...
NAZARETH AROUND 655 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE 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 4087 7505 4085 7507 4085 7509 4080 7510
4075 7520 4073 7518 4069 7520 4067 7518
4061 7520 4054 7533 4042 7549 4068 7589
4078 7568 4082 7542 4086 7529 4093 7521
4095 7512
TIME...MOT...LOC 2221Z 266DEG 32KT 4072 7569
$$
JJM1 follow-up statement
363
WWUS51 KPHI 102304
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
704 PM EDT WED APR 10 2013
PAC077-102314-
/O.CAN.KPHI.SV.W.0005.000000T0000Z-130410T2315Z/
LEHIGH PA-
704 PM EDT WED APR 10 2013
...THE SEVERE THUNDERSTORM WARNING FOR LEHIGH COUNTY IS CANCELLED...
SEVERE THUNDERSTORMS HAVE MOVED OUT OF THE COUNTY.
LAT...LON 4087 7505 4085 7509 4080 7510 4075 7520
4073 7518 4070 7520 4067 7518 4061 7520
4054 7533 4058 7541 4063 7539 4067 7543
4066 7548 4074 7553 4072 7556 4074 7560
4079 7561 4086 7529 4093 7521 4095 7512
TIME...MOT...LOC 2304Z 266DEG 32KT 4075 7519
$$
PAC095-102315-
/O.CON.KPHI.SV.W.0005.000000T0000Z-130410T2315Z/
NORTHAMPTON PA-
704 PM EDT WED APR 10 2013
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHAMPTON COUNTY...
AT 702 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM. THIS STORM WAS LOCATED NEAR
TATAMY...OR NEAR EASTON...MOVING EAST AT 35 MPH.
LAT...LON 4087 7505 4085 7509 4080 7510 4075 7520
4073 7518 4070 7520 4067 7518 4061 7520
4054 7533 4058 7541 4063 7539 4067 7543
4066 7548 4074 7553 4072 7556 4074 7560
4079 7561 4086 7529 4093 7521 4095 7512
TIME...MOT...LOC 2304Z 266DEG 32KT 4075 7519
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 4:53 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 112 min |
| Apr 10, 5:25 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 65 min |
| Apr 10, 6:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 49 min |
| Apr 10, 7:41 PM EDT | Special Weather Statement | PHI | Bucks, Chester, Montgomery | 64 min |
| Apr 10, 7:44 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery | 46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.