Alert archive / Delaware / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 41, NWS Philadelphia/Mount Holly

May 27, 2014New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2014, 5:56 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 64 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: May 27, 2014, 5:56 PM EDT (21:56 UTC)
Expired: May 27, 2014, 7:00 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 21:59 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
May 27, 6:37 PM EDT	TSTM WND DMG	Perryville, MD	TREE DOWN ON FRENCHTOWN RD

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
May 27, 5:30 PM EDT	Severe Thunderstorm Watch	SPC	3 hr
May 27, 2:13 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.9 hours before the alert went out and 22 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1885 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

592 
WUUS51 KPHI 272156
SVRPHI
DEC003-MDC015-272300-
/O.NEW.KPHI.SV.W.0041.140527T2156Z-140527T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
556 PM EDT TUE MAY 27 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  CENTRAL CECIL COUNTY IN NORTHEAST MARYLAND...

* UNTIL 700 PM EDT

* AT 555 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR CHARLESTOWN...MOVING EAST
  AT 20 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN    
  EXCESS OF 60 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THIS STORM. 

* LOCATIONS IMPACTED INCLUDE...
  HOLLYWOOD BEACH...
  ELKTON...
  BRANTWOOD...
  BRANTWOOD...
  GLASGOW...
  MOUNT PLEASANT...
  SAINT GEORGES...
  DELAWARE CITY...
  PORT PENN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE
THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

&&

LAT...LON 3966 7608 3963 7560 3959 7559 3963 7558
      3963 7556 3951 7555 3947 7558 3941 7552
      3937 7551 3948 7601 3952 7599 3955 7603
      3954 7607 3956 7610 3957 7610 3957 7609
      3956 7608 3957 7608 3960 7611
TIME...MOT...LOC 2156Z 283DEG 17KT 3958 7596

$$

FORECASTER: GORSE

2 follow-up statements

305 
WWUS51 KPHI 272215
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
615 PM EDT TUE MAY 27 2014

DEC003-MDC015-272300-
/O.CON.KPHI.SV.W.0041.000000T0000Z-140527T2300Z/
NEW CASTLE DE-CECIL MD-
615 PM EDT TUE MAY 27 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR EAST CENTRAL CECIL AND CENTRAL NEW CASTLE COUNTIES...

AT 612 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS
TO 60 MPH. THIS STORM WAS LOCATED NEAR CHESAPEAKE CITY...OR 8 MILES 
SOUTHEAST OF NORTHEAST...MOVING EAST AT 25 MPH.

A WIND GUST OF 50 MPH WAS REPORTED EARLIER FROM A SPOTTER IN NORTH 
EAST IN CECIL COUNTY.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GLASGOW...BOHEMIAS MILLS...BEAR...MOUNT PLEASANT...MIDDLETOWN...SAINT
GEORGES...ODESSA...DELAWARE CITY AND PORT PENN.

IN ADDITION TO DAMAGING WINDS...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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

LAT...LON 3964 7583 3963 7560 3959 7559 3963 7558
      3963 7556 3951 7555 3947 7558 3941 7552
      3937 7551 3948 7601
TIME...MOT...LOC 2214Z 283DEG 17KT 3954 7581

$$

GORSE

725 
WWUS51 KPHI 272243
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
643 PM EDT TUE MAY 27 2014

DEC003-MDC015-272252-
/O.CAN.KPHI.SV.W.0041.000000T0000Z-140527T2300Z/
NEW CASTLE DE-CECIL MD-
643 PM EDT TUE MAY 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CECIL AND CENTRAL
NEW CASTLE COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND 
WILL CONTINUE TO MOVE OUT OF THE AREA. THEREFORE, THE WARNING IS 
CANCELLED. HOWEVER HEAVY RAIN, WIND GUSTS TO 40 MPH AND LIGHTNING 
WILL STILL OCCUR WITH THIS STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND. A SEVERE THUNDERSTORM
WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT WEDNESDAY MORNING FOR
DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

LAT...LON 3964 7583 3963 7560 3959 7559 3963 7558
      3963 7556 3951 7555 3947 7558 3941 7552
      3937 7551 3948 7601
TIME...MOT...LOC 2242Z 283DEG 17KT 3951 7564

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 5:52 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	53 min
May 27, 6:19 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
May 27, 6:49 PM EDT	Special Weather Statement	PHI	Kent	56 min
May 27, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	60 min
May 27, 7:55 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	65 min
May 27, 2:39 PM EDT	Special Weather Statement	PHI	Queen Anne's	36 min
May 27, 5:34 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	41 min
May 27, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's	42 min
May 27, 7:23 PM EDT	Special Weather Statement	PHI	Caroline, Queen Anne's, Talbot	52 min

Nearby

Severe Thunderstorm Warnings in Delaware, 2014 Severe Thunderstorm Warnings in Maryland, 2014 Every severe thunderstorm warning in 2014

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.