Alert archive / Delaware / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 190, NWS Philadelphia/Mount Holly

August 10, 2012Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 10, 2012, 10:14 AM EDT for Sussex County, Delaware. It was in force for 61 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: Aug 10, 2012, 10:14 AM EDT (14:14 UTC)
Expired: Aug 10, 2012, 11:15 AM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 29 km from the middle of the area, began a volume at 14:16 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 10, 10:30 AM EDT	MARINE TSTM WIND 43	Lewes, DE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 2.2 hours before the alert went out and 83 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1273 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

726 
WUUS51 KPHI 101414
SVRPHI
DEC005-101515-
/O.NEW.KPHI.SV.W.0190.120810T1414Z-120810T1515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1014 AM EDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN SUSSEX COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF GEORGETOWN...

* UNTIL 1115 AM EDT

* AT 1012 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORMS AND A LEADING GUST FRONT CAPABLE OF PRODUCING
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THEY WERE LOCATED ALONG A 
  LINE EXTENDING FROM LEWES TO GUMBORO...OR ALONG A LINE EXTENDING FROM 
  13 MILES EAST OF GEORGETOWN TO 16 MILES SOUTH OF GEORGETOWN...AND MOVING
  EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CAPE HENLOPEN STATE PARK AND DAGSBORO AROUND 1025 AM EDT...
  REHOBOTH BEACH AND DAGSBORO AROUND 1030 AM EDT...
  SELBYVILLE AROUND 1040 AM EDT...
  MILLVILLE AROUND 1045 AM EDT...
  BETHANY BEACH AROUND 1055 AM EDT...
  BETHANY BEACH AROUND 1100 AM 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.

IN ADDITION TO DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

IN ADDITION TO DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

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 7559 3884 7531 3885 7522 3879 7515
      3879 7511 3881 7510 3880 7508 3867 7505
      3862 7505 3861 7504 3845 7504 3844 7505
TIME...MOT...LOC 1414Z 269DEG 18KT 3876 7516 3846 7540

$$

MPD

2 follow-up statements

988 
WWUS51 KPHI 101445
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1045 AM EDT FRI AUG 10 2012

DEC005-101515-
/O.CON.KPHI.SV.W.0190.000000T0000Z-120810T1515Z/
SUSSEX DE-
1045 AM EDT FRI AUG 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR EASTERN SUSSEX COUNTY...

AT 1040 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE SEVERE THUNDERSTORMS AND A LEADING GUST FRONT CAPABLE OF 
PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THEY WERE FROM NEAR 
CAPE HENLOPEN STATE PARK TO GUMBORO AND MOVING EAST AT 25 TO 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  FRANKFORD BY 1050 AM EDT...
  REHOBOTH BEACH AND LONG NECK BY 1055 AM EDT...
  SELBYVILLE AND DEWEY BEACH BY 1100 AM EDT...
  MILLVILLE BY 1105 AM EDT...
  OCEAN VIEW BY 1110 AM EDT...
  BETHANY BEACH...SOUTH BETHANY AND FENWICK ISLAND BY 1115 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

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 7559 3884 7531 3885 7522 3879 7515
      3879 7511 3881 7510 3880 7508 3867 7505
      3862 7505 3861 7504 3845 7504 3844 7505
TIME...MOT...LOC 1444Z 269DEG 18KT 3882 7508 3846 7532

$$

MPD

815 
WWUS51 KPHI 101504
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1104 AM EDT FRI AUG 10 2012

DEC005-101515-
/O.CON.KPHI.SV.W.0190.000000T0000Z-120810T1515Z/
SUSSEX DE-
1104 AM EDT FRI AUG 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR SOUTHEASTERN SUSSEX COUNTY...

AT 1100 AM EDT...AN AREA OF THUNDERSTORMS WAS FROM ABOUT 10 MILES 
EAST OF CAPE HENLOPEN STATE PARK TO SELBYVILLE...OR FROM ABOUT 25 
MILES EAST OF GEORGETOWN TO 20 MILES SOUTH OF GEORGETOWN...MOVING 
EAST AT 25 MPH. SCATTERED THUNDERSTORMS TRAILED THE AREA. 

THUNDERSTORMS WILL BE NEAR...
  OCEAN VIEW BY 1110 AM EDT...
  BETHANY BEACH...SOUTH BETHANY AND FENWICK ISLAND BY 1115 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THE STRONGEST  
STORMS. MOVE INDOORS IMMEDIATELY! REMEMBER...IF YOU CAN HEAR 
THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

HEAVY RAIN WILL OCCUR WITH THESE STORMS AND CAUSE LOW-LYING AND POOR 
DRAINAGE FLOODING.

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 7559 3869 7528 3879 7515 3879 7511
      3881 7510 3880 7508 3867 7505 3862 7505
      3861 7504 3845 7504 3844 7505
TIME...MOT...LOC 1502Z 269DEG 18KT 3879 7491 3841 7528

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 8:41 AM EDT	Special Weather Statement	PHI	Kent, New Castle	94 min
Aug 10, 8:43 AM EDT	Special Weather Statement	PHI	Kent, New Castle	92 min
Aug 10, 8:55 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	65 min
Aug 10, 9:08 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	3 hr
Aug 10, 10:05 AM EDT	Special Weather Statement	PHI	Kent, New Castle, Sussex	115 min
Aug 10, 10:33 AM EDT	Areal Flood Advisory	PHI	Sussex	4 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 2012 Every 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.