Alert archive / Pennsylvania / Special Weather Statements in 2020
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Aug 7, 2020, 4:47 PM EDT for Chester County, Pennsylvania. It was in force for 28 min. 6 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
- Aug 7, 2020, 4:47 PM EDT (20:47 UTC)
- Expired
- Aug 7, 2020, 5:15 PM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
County Chester County, PA
The radar
The Dover AFB radar (KDOX), 130 km from the middle of the area, began a volume at 20:46 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 |
|---|---|---|---|
| Aug 7, 5:02 PM EDT | TSTM WND DMG | 2 Nnw Sadsburyville, PA | DOWN TREE IN WIRES ON OLD WILMINGTON ROAD AND OAK STREET. TIME ESTIMATED FROM RADAR. |
| Aug 7, 5:03 PM EDT | TSTM WND DMG | Mount Vernon, PA | DOWNED TREE INTO WIRES ON PA 472 NEAR OXFORD. TIME ESTIMATED FROM RADAR. |
| Aug 7, 5:05 PM EDT | TSTM WND DMG | Cochranville, PA | TREE BLOWN DOWN BLOCKING SOUTHBOUND LANE AT THE INTERSECTION OF LIMESTONE RD AND GAP NEWPORT PIKE. TIME ESTIMATED FROM RADAR. |
| Aug 7, 5:08 PM EDT | TSTM WND DMG | 1 Ne Londonderry Twp, PA | SEVERAL TREES DOWN ALONG PORTIONS OF ROUTE 41. TIME ESTIMATED FROM RADAR. |
| Aug 7, 5:12 PM EDT | TSTM WND DMG | 1 Ssw East Brandywine T, PA | SEVERAL TREES AND POLES DOWN JUST NORTH OF FISHERVILLE ROAD. TIME ESTIMATED FROM RADAR. |
| Aug 7, 5:25 PM EDT | TSTM WND GST 52 | 2 E Londonderry Twp, PA | 52 MPH WIND GUST MEASURED AT WEST GROVE DEOS (DSCR) MESONET. |
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, 8.8 hours before the alert went out and 164 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
- 301 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 665 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
799
WWUS81 KPHI 072047
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
447 PM EDT Fri Aug 7 2020
PAZ101-102-072115-
Western Chester-Eastern Chester-
447 PM EDT Fri Aug 7 2020
...A STRONG THUNDERSTORM WILL AFFECT WESTERN CHESTER COUNTY...
At 445 PM EDT, a strong thunderstorm was located over Parkesburg, or
11 miles southeast of New Holland, moving east at 20 mph.
Wind gusts up to 40 mph and pea size hail are possible with this
storm.
Heavy rainfall is also occurring with this storm...and may cause
ponding on roadways and poor drainage areas. Do not drive your
vehicle through flooded roadways.
Frequent lightning is occurring with this storm. Lightning can
strike 15 miles away from a thunderstorm. If you see lightning or
hear thunder seek a safe shelter inside a building or vehicle.
Locations impacted include...
Coatesville, Oxford, Parkesburg, West Grove, Honey Brook, Homeville,
Cochranville, Glenmoore, Mount Vernon, Kemblesville, Atglen, South
Coatesville, Modena and Thorndale.
This includes Pennsylvania Turnpike between mile markers 304 and 308.
LAT...LON 3983 7604 3983 7602 3985 7602 3987 7599
3992 7600 3994 7598 3995 7600 4004 7593
4011 7594 4013 7591 4014 7571 3973 7583
3979 7605
TIME...MOT...LOC 2045Z 275DEG 16KT 3995 7597
$$
RobertsonThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 5:15 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Warren | 3 hr |
| Aug 7, 5:25 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Salem | 3 hr |
| Aug 7, 5:43 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester | 4 hr |
| Aug 7, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem | 48 min |
| Aug 7, 6:00 PM EDT | Tornado Warning | PHI | Gloucester, Salem | 30 min |
| Aug 7, 6:08 PM EDT | Areal Flood Advisory | PHI | Cumberland, Gloucester, Salem | 3 hr |
| Aug 7, 6:16 PM EDT | Areal Flood Advisory | PHI | Mercer | 2 hr |
| Aug 7, 6:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Aug 7, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Hunterdon, Mercer | 27 min |
| Aug 7, 6:41 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 49 min |
| Aug 7, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 48 min |
| Aug 7, 7:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Aug 7, 7:25 PM EDT | Flash Flood Warning | PHI | Atlantic, Cape May, Cumberland, Gloucester | 4 hr |
| Aug 7, 7:28 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more | 62 min |
| Aug 7, 6:49 AM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 7, 9:22 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 7, 10:34 AM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh | 56 min |
| Aug 7, 11:28 AM EDT | Special Weather Statement | PHI | Carbon, Lehigh | 47 min |
| Aug 7, 2:34 PM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 7, 3:46 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Northampton | 4 hr |
| Aug 7, 4:10 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 7, 4:20 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 4 hr |
| Aug 7, 4:32 PM EDT | Flash Flood Warning | PHI | Chester | 3 hr |
| Aug 7, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 60 min |
| Aug 7, 5:03 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 5 hr |
| Aug 7, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 52 min |
| Aug 7, 5:49 PM EDT | Tornado Warning | PHI | Chester, Delaware | 26 min |
| Aug 7, 7:10 PM EDT | River Flood Warning | PHI | Delaware | 7 hr |
| Aug 7, 7:17 PM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 3 hr |
| Aug 7, 6:12 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 63 min |
| Aug 7, 6:43 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
| Aug 7, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 41 min |
| Aug 7, 7:21 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 5 hr |
| Aug 7, 7:28 PM EDT | River Flood Warning | PHI | New Castle | 2 hr |
| Aug 7, 7:36 PM EDT | Special Weather Statement | PHI | Kent | 39 min |
| Aug 7, 4:41 PM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 7, 7:44 PM EDT | Flash Flood Warning | PHI | Caroline, Kent, Queen Anne's | 4 hr |
Nearby
Special Weather Statements in Pennsylvania, 2020Every special weather statement in 2020
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.