Alert archive / Maryland / Tornado Warnings in 2013
Tornado Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Aug 13, 2013, 6:32 AM EDT for Cecil County, Maryland; New Castle County, Delaware; Chester County, Pennsylvania. It was in force for 43 min. 4 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 13, 2013, 6:32 AM EDT (10:32 UTC)
- Expired
- Aug 13, 2013, 7:15 AM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 97 km from the middle of the area, began a volume at 10:36 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 13, 6:50 AM EDT | TSTM WND DMG | Elkton, MD | 20 TO 30 TREES DOWN 600 BLOCK KNOTTINGHAM ROAD |
| Aug 13, 6:55 AM EDT | TSTM WND GST 60 | Newark, DE | |
| Aug 13, 6:56 AM EDT | TSTM WND DMG | Bear, DE | TREES DOWN |
| Aug 13, 6:56 AM EDT | TSTM WND DMG | Newark, DE | TREES DOWN |
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, 10.5 hours before the alert went out and 141 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
- -66 J/kg
- Mixed-layer LCL
- 1841 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
981
WFUS51 KPHI 131032
TORPHI
DEC003-MDC015-PAC029-131115-
/O.NEW.KPHI.TO.W.0004.130813T1032Z-130813T1115Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
632 AM EDT TUE AUG 13 2013
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* TORNADO WARNING FOR...
WEST CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
NORTHERN CECIL COUNTY IN NORTHEAST MARYLAND...
SOUTH CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 715 AM EDT
* AT 630 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE STORM
CONTAINING THE POSSIBLE TORNADO WAS NEAR CHARLESTOWN...MOVING EAST
AT 20 MPH.
* THE TORNADO WILL BE NEAR...
HOLLYWOOD BEACH AROUND 640 AM EDT...
NORTH EAST AND ZION AROUND 645 AM EDT...
BLAKE AROUND 655 AM EDT...
ELKTON AND CHERRY HILL AROUND 700 AM EDT...
BARKSDALE AND APPLETON AROUND 705 AM EDT...
GLASGOW AND NEWARK AROUND 710 AM EDT...
WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
TAKE COVER INSIDE NOW. DO NOT WAIT TO SEE OR HEAR THE TORNADO. MOVE
TO AN INTERIOR ROOM ON THE LOWEST LEVEL OF A STURDY BUILDING. PUT AS
MANY WALLS BETWEEN YOU AND THE OUTSIDE AS YOU CAN. AVOID WINDOWS.
PROTECT YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 3979 7575 3955 7557 3947 7600 3952 7599
3955 7603 3954 7607 3956 7610 3957 7610
3957 7609 3956 7608 3957 7608 3963 7615
TIME...MOT...LOC 1032Z 252DEG 19KT 3957 7601
$$
KLINE1 follow-up statement
211
WWUS51 KPHI 131100
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
700 AM EDT TUE AUG 13 2013
MDC015-PAC029-131110-
/O.CAN.KPHI.TO.W.0004.000000T0000Z-130813T1115Z/
CECIL MD-CHESTER PA-
700 AM EDT TUE AUG 13 2013
...THE TORNADO WARNING FOR SOUTH CENTRAL CHESTER AND CECIL COUNTIES
IS CANCELLED...
THE STORM THAT PROMPTED THE TORNADO WARNING HAS MOVED OUT OF THE
AREA...THEREFORE THE TORNADO WARNING HAS BEEN CANCELLED.
LAT...LON 3973 7577 3976 7575 3977 7574 3977 7573
3955 7557 3958 7577 3968 7579 3972 7579
TIME...MOT...LOC 1100Z 256DEG 32KT 3965 7570
$$
DEC003-131115-
/O.CON.KPHI.TO.W.0004.000000T0000Z-130813T1115Z/
NEW CASTLE DE-
700 AM EDT TUE AUG 13 2013
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 AM EDT FOR WEST
CENTRAL NEW CASTLE COUNTY...
AT 659 AM EDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION THAT MAY BE PRODUCING A
TORNADO. THIS STORM THAT MAY BE PRODUCING A TORNADO WAS LOCATED NEAR
BROOKSIDE...OR NEAR NEWARK...MOVING EAST AT 35 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DELAWARE CITY...GLASGOW AND BEAR
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE...AND STAY AWAY FROM
WINDOWS.
&&
LAT...LON 3973 7577 3976 7575 3977 7574 3977 7573
3955 7557 3958 7577 3968 7579 3972 7579
TIME...MOT...LOC 1100Z 256DEG 32KT 3965 7570
$$
FORECASTER: DRAGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 2:45 AM EDT | Flash Flood Watch | PHI | Cecil | 9 hr |
| Aug 13, 5:54 AM EDT | Areal Flood Advisory | PHI | Cecil | 7 hr |
| Aug 13, 6:23 AM EDT | Severe Thunderstorm Warning | PHI | Cecil | 67 min |
| Aug 13, 12:47 PM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 13, 4:55 PM EDT | Special Weather Statement | PHI | Cecil | 65 min |
| Aug 13, 6:51 AM EDT | Areal Flood Advisory | PHI | New Castle | 7 hr |
| Aug 13, 7:05 AM EDT | Severe Thunderstorm Warning | PHI | New Castle | 40 min |
| Aug 13, 7:31 AM EDT | Special Weather Statement | PHI | New Castle | 44 min |
| Aug 13, 7:54 AM EDT | Flash Flood Warning | PHI | New Castle | 8 hr |
| Aug 13, 7:57 AM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Aug 13, 8:37 AM EDT | River Flood Warning | PHI | New Castle | 4 hr |
| Aug 13, 11:19 AM EDT | Special Weather Statement | PHI | Kent | 56 min |
| Aug 13, 1:50 PM EDT | River Flood Warning | PHI | New Castle | 119 min |
| Aug 13, 2:18 PM EDT | Areal Flood Warning | PHI | New Castle | 9 hr |
| Aug 13, 5:15 AM EDT | Areal Flood Advisory | PHI | Berks, Chester, Montgomery | 4 hr |
| Aug 13, 5:47 AM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 13, 6:07 AM EDT | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 7 hr |
| Aug 13, 6:07 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 53 min |
| Aug 13, 6:20 AM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 4 hr |
| Aug 13, 6:36 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 8 hr |
| Aug 13, 7:14 AM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 13, 7:42 AM EDT | Special Weather Statement | PHI | Philadelphia | 48 min |
| Aug 13, 7:54 AM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 66 min |
| Aug 13, 8:07 AM EDT | River Flood Warning | PHI | Chester | 9 hr |
| Aug 13, 8:20 AM EDT | Flash Flood Warning | PHI | Bucks | 8 hr |
| Aug 13, 9:50 AM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 13, 11:22 AM EDT | River Flood Warning | PHI | Chester, Delaware | 16 hr |
Nearby
Tornado Warnings in Maryland, 2013Tornado Warnings in Delaware, 2013Tornado Warnings in Pennsylvania, 2013Every tornado warning in 2013Tornadoes 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.