Alert archive / Delaware / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 230, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 18, 2012, 5:57 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 78 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
- Sep 18, 2012, 5:57 PM EDT (21:57 UTC)
- Expired
- Sep 18, 2012, 7:15 PM EDT
- In force
- 78 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 16 km from the middle of the area, began a volume at 22:00 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 |
|---|---|---|---|
| Sep 18, 6:55 PM EDT | TSTM WND DMG | Woodlawn, MD | TREES DOWN WITH POWER OUTAGES ALONG ROUTE 13 NEAR THE DELAWARE STATE LINE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 18, 12:10 PM EDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.0 hours before the alert went out and 77 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
- 330 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 519 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 265 m²/s²
- 0-3 km storm-relative helicity
- 275 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
980
WUUS51 KPHI 182157
SVRPHI
DEC001-005-MDC011-182315-
/O.NEW.KPHI.SV.W.0230.120918T2157Z-120918T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
557 PM EDT TUE SEP 18 2012
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
KENT COUNTY IN CENTRAL DELAWARE...
THIS INCLUDES THE CITY OF DOVER...
CAROLINE COUNTY IN EASTERN MARYLAND...
SUSSEX COUNTY IN SOUTHERN DELAWARE...
THIS INCLUDES THE CITY OF GEORGETOWN...
* UNTIL 715 PM EDT
* AT 552 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 8 MILES NORTH OF SMYRNA TO 26 MILES SOUTH OF CHOPTANK...AND
MOVING NORTHEAST AT 40 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
HAZLETTVILLE AND CHESWOLD AROUND 605 PM EDT...
AGNER AROUND 610 PM EDT...
SMITHVILLE...WOODLAND BEACH...DOVER SPEEDWAY AND FEDERALSBURG
AROUND 615 PM EDT...
ANDREWSVILLE...VIOLA AND DOVER AROUND 620 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...HAIL...AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3845 7569 3865 7572 3870 7584 3867 7594
3870 7600 3878 7597 3881 7590 3885 7593
3913 7580 3914 7575 3930 7572 3931 7559
3937 7551 3932 7543 3907 7539 3898 7530
3892 7530 3880 7517 3880 7508 3844 7505
TIME...MOT...LOC 2157Z 238DEG 34KT 3943 7556 3835 7607
$$
IOVINO1 follow-up statement
958
WWUS51 KPHI 182243
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
643 PM EDT TUE SEP 18 2012
MDC011-182252-
/O.CAN.KPHI.SV.W.0230.000000T0000Z-120918T2315Z/
CAROLINE MD-
643 PM EDT TUE SEP 18 2012
...THE SEVERE THUNDERSTORM WARNING FOR CAROLINE COUNTY IS
CANCELLED...
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 3846 7569 3868 7572 3931 7559 3937 7551
3932 7543 3907 7539 3898 7530 3892 7530
3880 7517 3880 7508 3844 7505
TIME...MOT...LOC 2242Z 238DEG 34KT 3965 7509 3858 7561
$$
DEC001-005-182315-
/O.CON.KPHI.SV.W.0230.000000T0000Z-120918T2315Z/
KENT DE-SUSSEX DE-
643 PM EDT TUE SEP 18 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SUSSEX AND KENT COUNTIES...
AT 637 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM WOODLAND BEACH TO FARMINGTON TO SEAFORD...MOVING
NORTHEAST AT 40 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
SYCAMORE...BIG STONE BEACH AND ELLENDALE BY 650 PM EDT...
GUMBORO BY 655 PM EDT...
SLAUGHTER BEACH BY 700 PM EDT...
SELBYVILLE...MILLSBORO...FRANKFORD AND DAGSBORO BY 705 PM EDT...
MILTON BY 710 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...HAIL...AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.
&&
LAT...LON 3846 7569 3868 7572 3931 7559 3937 7551
3932 7543 3907 7539 3898 7530 3892 7530
3880 7517 3880 7508 3844 7505
TIME...MOT...LOC 2242Z 238DEG 34KT 3965 7509 3858 7561
$$
IOVINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 4:13 AM EDT | Coastal Flood Advisory | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 21 hr |
| Sep 18, 3:32 PM EDT | Special Weather Statement | PHI | Cecil, Kent, Queen Anne's, Talbot | 58 min |
| Sep 18, 3:51 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 84 min |
| Sep 18, 4:35 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 55 min |
| Sep 18, 4:42 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 78 min |
| Sep 17, 8:54 PM EDT | Rip Current Statement | PHI | Sussex | 23 hr |
| Sep 18, 4:21 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 69 min |
| Sep 18, 5:12 PM EDT | Areal Flood Advisory | PHI | New Castle | 63 min |
| Sep 18, 5:23 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 52 min |
| Sep 18, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 38 min |
| Sep 18, 7:16 PM EDT | Areal Flood Advisory | PHI | Sussex | 59 min |
Nearby
Severe Thunderstorm Warnings in Delaware, 2012Severe Thunderstorm Warnings in Maryland, 2012Every severe thunderstorm warning in 2012
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.