Alert archive / Maryland / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

August 27, 20114 counties in New Jersey; 5 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 27, 2011, 2:36 PM EDT for 4 counties in New Jersey; 5 counties in Maryland; Kent County, New Castle County, Sussex County, Delaware. It was in force for 54 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, 2:36 PM EDT (18:36 UTC)
Expired
Aug 27, 2011, 3:30 PM EDT
In force
54 min
Issued by
NWS Philadelphia/Mount Holly

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 23 km from the middle of the area, began a volume at 18:36 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 nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.6 hours before the alert went out and 122 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°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.

006 
WWUS81 KPHI 271836
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
236 PM EDT SAT AUG 27 2011

DEZ001>004-MDZ008-012-015-019-020-NJZ016>018-020>027-271930-
ATLANTIC NJ-ATLANTIC COASTAL CAPE MAY NJ-CAMDEN NJ-CAPE MAY NJ-
CAROLINE MD-CECIL MD-COASTAL ATLANTIC NJ-COASTAL OCEAN NJ-
CUMBERLAND NJ-DELAWARE BEACHES DE-GLOUCESTER NJ-INLAND SUSSEX DE-
KENT MD-KENT DE-NEW CASTLE DE-OCEAN NJ-QUEEN ANNE'S MD-SALEM NJ-
SOUTHEASTERN BURLINGTON NJ-TALBOT MD-
236 PM EDT SAT AUG 27 2011

...BANDS OF VERY HEAVY SHOWERS WITH STRONG WIND GUSTS WILL AFFECT 
KENT...CAROLINE...CECIL...SALEM...CUMBERLAND...CAMDEN...GLOUCESTER...
QUEEN ANNE'S...TALBOT...SUSSEX...NEW CASTLE...CAPE 
MAY...OCEAN...ATLANTIC AND BURLINGTON COUNTIES...

AT 230 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
BANDS OF VERY HEAVY SHOWERS WITH STRONG WIND GUSTS MOVING WEST 
NORTHWEST THROUGH DELAWARE...ADJACENT EASTERN MARYLAND AND SOUTHERN 
NEW JERSEY.

STRONG WIND GUSTS NEAR 60 MPH WILL BE POSSIBLE IN KENT AND SUSSEX 
COUNTIES OF SOUTHERN DELAWARE...AND IN CAROLINE AND TALBOT COUNTIES 
OF MARYLAND BETWEEN NOW AND 330 PM WITH 45 TO 50 MPH GUSTS IN SOME 
OF THE TORRENTIAL DOWNPOURS ELSEWHERE. POWER OUTAGES MAY DEVELOP IN 
SOUTHERN DELAWARE SHORTLY. 

VERY HEAVY RAINFALL WILL OCCUR OVER AREAS THAT RECEIVED HEAVY RAINS 
EARLIER. BE ALERT FOR THE POSSIBILITY OF LOCALIZED FLOODING AND AN 
AREAL FLOOD WARNING IS IN EFFECT FOR MUCH OF THIS REGION.

LAT...LON 3846 7570 3869 7583 3856 7604 3867 7636
      3884 7620 3894 7637 3955 7603 3955 7608
      3975 7409 3892 7495 3892 7497 3916 7491
      3917 7514 3951 7553 3958 7554 3958 7556
      3893 7530 3880 7507 3844 7505

$$

FORECASTER:  DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 11:07 AM EDTSpecial Marine WarningPHI53 min
Aug 27, 12:00 PM EDTSpecial Marine WarningPHI23 min
Aug 27, 1:28 PM EDTSpecial Weather StatementPHIAtlantic, Camden, Cape May, Cumberland, Gloucester, Ocean and 1 more62 min
Aug 27, 2:14 PM EDTAreal Flood WarningPHICape May, Cumberland, Gloucester, Salem6 hr
Aug 27, 3:47 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Gloucester, Hunterdon and 5 more118 min
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMorris, Somerset5 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMorris, Somerset7 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic18 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIEssex, Passaic8 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMorris, Passaic72 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMorris, Passaic3 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIBergen, Morris, Passaic66 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIBurlington5 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon, Somerset37 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHISomerset35 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMiddlesex, Somerset60 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMiddlesex, Somerset66 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon, Warren60 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon, Mercer60 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon58 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon58 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon, Mercer42 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIHunterdon, Mercer48 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMercer60 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMorris72 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMorris4 days
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMercer66 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHISomerset3 days
Aug 27, 4:09 PM EDTSpecial Weather StatementPHIMercer51 min
Aug 27, 5:42 PM EDTAreal Flood WarningPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 6 more6 hr
Aug 27, 5:58 PM EDTSpecial Marine WarningPHI32 min
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMontgomery29 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMontgomery23 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia36 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMontgomery, Philadelphia35 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMonroe25 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIMonroe42 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHILehigh, Northampton23 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHILehigh, Northampton23 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIChester, Delaware37 hr
Aug 27, 4:06 PM EDTRiver Flood WarningPHIBucks38 hr
Aug 27, 5:37 PM EDTRiver Flood WarningPHIChester19 hr
Aug 27, 5:37 PM EDTRiver Flood WarningPHIDelaware23 hr
Aug 27, 5:37 PM EDTRiver Flood WarningPHILehigh22 hr
Aug 27, 7:27 PM EDTFlash Flood WarningPHICaroline, Queen Anne's, Talbot12 hr
Aug 27, 12:12 PM EDTTornado WarningPHISussex28 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, 6:14 PM EDTSpecial Weather StatementPHISussex31 min
Aug 27, 6:22 PM EDTTornado WarningPHIKent, Sussex23 min

Nearby

Special Weather Statements in Maryland, 2011Special Weather Statements in New Jersey, 2011Special Weather Statements in Delaware, 2011Every special weather statement 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.