Alert archive / Maryland / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 186, NWS Philadelphia/Mount Holly

August 17, 2016Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2016, 10:44 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 61 min. 3 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 17, 2016, 10:44 PM EDT (02:44 UTC)
Expired
Aug 17, 2016, 11:45 PM EDT
In force
61 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 46 km from the middle of the area, began a volume at 02:48 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

TimeReportWhereRemark
Aug 17, 11:35 PM EDTTSTM WND DMGMillsboro, DETREES DOWN IN STORMWATER CREEK DEVELOPMENT. TIME ESTIMATED FROM RADAR.
Aug 17, 11:46 PM EDTMARINE TSTM WIND 48Dewey Beach, DE
Aug 17, 11:55 PM EDTMARINE TSTM WIND 53Lewes, DE

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 00:00Z, 2.7 hours before the alert went out and 82 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, Phillips Aaf/Abe, MD at 00:00Z on 2016-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 138 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 00:00Z on 2016-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 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
138 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1550 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

856 
WUUS51 KPHI 180244
SVRPHI
DEC001-005-MDC011-035-041-180345-
/O.NEW.KPHI.SV.W.0186.160818T0244Z-160818T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1044 PM EDT WED AUG 17 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
  SUSSEX COUNTY IN SOUTHERN DELAWARE...
  TALBOT COUNTY IN EASTERN MARYLAND...
  SOUTHWESTERN QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
  CAROLINE COUNTY IN EASTERN MARYLAND...

* UNTIL 1145 PM EDT

* AT 1043 PM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR TILGHMAN ISLAND TO NEAR POCOMOKE CITY...MOVING
  NORTHEAST AT 45 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  EASTON...GEORGETOWN...TALBOT...MILFORD...SEAFORD...DENTON...
  MILLSBORO...LAUREL...HARRINGTON...ROMANCOKE...LEWES...
  FEDERALSBURG...MILTON...BRIDGEVILLE...GREENSBORO...OAKLAND...
  RIDGELY...TRAPPE...ST. MICHAELS AND DAGSBORO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3846 7569 3864 7571 3871 7584 3857 7604
      3868 7621 3876 7622 3871 7628 3878 7629
      3876 7632 3869 7632 3869 7633 3889 7637
      3890 7636 3889 7628 3878 7621 3892 7626
      3911 7537 3892 7528 3879 7505 3846 7504
TIME...MOT...LOC 0243Z 243DEG 38KT 3869 7636 3801 7563 

HAIL...<.75IN
WIND...60MPH
 
$$

MWG
2 follow-up statements
213 
WWUS51 KPHI 180320
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1120 PM EDT WED AUG 17 2016

MDC035-180329-
/O.CAN.KPHI.SV.W.0186.000000T0000Z-160818T0345Z/
QUEEN ANNE'S MD-
1120 PM EDT WED AUG 17 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN QUEEN ANNE'S
COUNTY IS CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED
AREA THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3864 7570 3869 7577 3868 7578 3871 7584
      3881 7598 3898 7594 3899 7593 3911 7537
      3905 7537 3892 7528 3881 7514 3879 7505
      3846 7504 3846 7569
TIME...MOT...LOC 0319Z 243DEG 38KT 3886 7593 3818 7520 

$$

DEC001-005-MDC011-041-180345-
/O.CON.KPHI.SV.W.0186.000000T0000Z-160818T0345Z/
KENT DE-SUSSEX DE-CAROLINE MD-TALBOT MD-
1120 PM EDT WED AUG 17 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR SOUTHERN KENT...SUSSEX...CAROLINE AND NORTHEASTERN TALBOT
COUNTIES...

AT 1119 PM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM GRIFFIN TO 6 MILES SOUTHEAST OF NEWARK...MOVING
NORTHEAST AT 45 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
GEORGETOWN...MILFORD...SEAFORD...DENTON...MILLSBORO...LAUREL...
HARRINGTON...LEWES...FEDERALSBURG...MILTON...BRIDGEVILLE...
GREENSBORO...OAKLAND...RIDGELY...DAGSBORO...MILLVILLE...ELLENDALE...
BOWERS...QUEEN ANNE AND VIOLA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3864 7570 3869 7577 3868 7578 3871 7584
      3881 7598 3898 7594 3899 7593 3911 7537
      3905 7537 3892 7528 3881 7514 3879 7505
      3846 7504 3846 7569
TIME...MOT...LOC 0319Z 243DEG 38KT 3886 7593 3818 7520 

HAIL...<.75IN
WIND...60MPH
 
$$

MWG
591 
WWUS51 KPHI 180343
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1143 PM EDT WED AUG 17 2016

DEC001-005-MDC011-041-180352-
/O.EXP.KPHI.SV.W.0186.000000T0000Z-160818T0345Z/
KENT DE-SUSSEX DE-CAROLINE MD-TALBOT MD-
1143 PM EDT WED AUG 17 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN KENT...SUSSEX...
CAROLINE AND NORTHEASTERN TALBOT COUNTIES WILL EXPIRE AT 1145 PM
EDT...
            
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3864 7570 3869 7577 3868 7578 3871 7584
      3881 7598 3898 7594 3899 7593 3911 7537
      3905 7537 3892 7528 3881 7514 3879 7505
      3846 7504 3846 7569
TIME...MOT...LOC 0340Z 243DEG 38KT 3886 7593 3818 7520 

$$

MWG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 10:25 PM EDTSevere Thunderstorm WarningPHIKent, New Castle50 min
Aug 17, 11:16 PM EDTSpecial Weather StatementPHIKent44 min
Aug 17, 11:46 PM EDTSpecial Weather StatementPHISussex59 min
Aug 17, 9:52 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's, Talbot38 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2016Severe Thunderstorm Warnings in Delaware, 2016Every severe thunderstorm warning in 2016

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.