Alert archive / Delaware / Tornado Warnings in 2011

Tornado Warning 14, NWS Philadelphia/Mount Holly

August 27, 2011Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 27, 2011, 12:12 PM EDT for Sussex County, Delaware. It was in force for 28 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
Aug 27, 2011, 12:12 PM EDT (16:12 UTC)
Expired
Aug 27, 2011, 12:40 PM EDT
In force
28 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 27 km from the middle of the area, began a volume at 16:14 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.

IssuedProductOfficeLasted
Aug 27, 10:41 AM EDTTornado WatchSPC9 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.2 hours before the alert went out and 95 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.

Skew-T log-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2011-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 330 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2011-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
330 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
691 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
221 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

504 
WFUS51 KPHI 271612
TORPHI
DEC005-271645-
/O.NEW.KPHI.TO.W.0014.110827T1612Z-110827T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1212 PM EDT SAT AUG 27 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL SUSSEX COUNTY IN SOUTHERN DELAWARE...

* UNTIL 1245 PM EDT

* AT 1210 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR REHOBOTH
  BEACH...OR 17 MILES SOUTH OF CAPE MAY...MOVING WEST AT 35 MPH.

* THE TORNADO WILL BE NEAR...
  REHOBOTH BEACH BY 1220 PM EDT...
  LEWES BY 1230 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY 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 3871 7532 3887 7525 3880 7516 3879 7511
      3881 7509 3880 7507 3876 7506 3874 7507
      3869 7506 3868 7507
TIME...MOT...LOC 1612Z 111DEG 28KT 3871 7500

$$
ROBERTSON/MANNING
1 follow-up statement
440 
WWUS51 KPHI 271640
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1240 PM EDT SAT AUG 27 2011

DEC005-271645-
/O.CAN.KPHI.TO.W.0014.000000T0000Z-110827T1645Z/
SUSSEX DE-
1240 PM EDT SAT AUG 27 2011

...THE TORNADO WARNING FOR EAST CENTRAL SUSSEX COUNTY IS CANCELLED...

THE STORM THAT PROMPTED THE TORNADO WARNING HAS MOVED OUT OF THE 
WARNED AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SATURDAY EVENING 
FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY.

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 3871 7532 3887 7525 3880 7516 3879 7511
      3881 7509 3880 7507 3876 7506 3874 7507
      3869 7506 3868 7507
TIME...MOT...LOC 1635Z 111DEG 28KT 3877 7522

$$

ROBERTSON

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 27, 1:28 PM EDTSpecial Weather StatementPHIKent, New Castle, Sussex62 min
Aug 27, 2:14 PM EDTAreal Flood WarningPHIKent, New Castle, Sussex6 hr
Aug 27, 2:36 PM EDTSpecial Weather StatementPHIKent, New Castle, Sussex54 min
Aug 27, 3:47 PM EDTAreal Flood AdvisoryPHINew Castle118 min
Aug 27, 4:06 PM EDTRiver Flood WarningPHINew Castle37 hr
Aug 27, 5:37 PM EDTRiver Flood WarningPHINew Castle18 hr
Aug 27, 5:37 PM EDTRiver Flood WarningPHINew Castle19 hr
Aug 27, 5:37 PM EDTRiver Flood WarningPHINew Castle24 hr
Aug 27, 5:42 PM EDTAreal Flood WarningPHINew Castle6 hr
Aug 27, 6:14 PM EDTSpecial Weather StatementPHISussex31 min
Aug 27, 6:22 PM EDTTornado WarningPHIKent, Sussex23 min
Aug 27, 7:27 PM EDTFlash Flood WarningPHIKent, Sussex12 hr

Nearby

Tornado Warnings in Delaware, 2011Every tornado warning in 2011Tornadoes in 2011

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.