Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

September 6, 2011Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 6, 2011, 4:17 AM EDT for Sussex County, Delaware. It was in force for 43 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
Sep 6, 2011, 4:17 AM EDT (08:17 UTC)
Expired
Sep 6, 2011, 5:00 AM EDT
In force
43 min
Issued by
NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 27 km from the middle of the area, began a volume at 08:19 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 00:00Z, 8.3 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, Wallops Is Stn, VA at 00:00Z on 2011-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 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 00:00Z on 2011-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
43 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1046 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
66 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.

735 
WWUS81 KPHI 060817
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
417 AM EDT TUE SEP 6 2011

DEZ003-004-060900-
DELAWARE BEACHES DE-INLAND SUSSEX DE-
417 AM EDT TUE SEP 6 2011

...SHOWERS WITH STRONG WIND GUSTS WILL AFFECT SUSSEX COUNTY...

AT 410 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS WITH STRONG WIND GUSTS ALONG A LINE EXTENDING FROM 6 MILES
SOUTHWEST OF GEORGETOWN TO 2 MILES NORTH OF SALISBURY TO 16 MILES
SOUTHWEST OF SALISBURY...MOVING NORTHEAST AT 30 MPH. THE SHOWERS WILL
BE NEAR GUMBORO AROUND 440 AM...LEWES AROUND 455 AM AND LONG NECK
AROUND 500 AM.

VERY HEAVY RAIN WILL FALL FROM THESE SHOWERS...AND WILL CAUSE WATER
TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE SHOWERS.

LAT...LON 3846 7560 3868 7546 3879 7517 3879 7511
      3881 7509 3880 7507 3874 7507 3865 7505
      3863 7506 3861 7504 3845 7520

$$

FORECASTER: DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 9:43 PM EDTFlash Flood WarningPHIMorris, Sussex, Warren4 hr
Sep 5, 11:04 PM EDTAreal Flood AdvisoryPHIHunterdon, Warren6 hr
Sep 6, 12:22 AM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Salem3 hr
Sep 6, 1:32 AM EDTAreal Flood AdvisoryPHIMorris, Sussex, Warren5 hr
Sep 6, 6:57 AM EDTAreal Flood WarningPHIMorris22 hr
Sep 6, 4:35 PM EDTRiver Flood WarningPHIEssex, Passaic7 days
Sep 6, 4:35 PM EDTRiver Flood WarningPHIMorris, Passaic4 days
Sep 6, 4:35 PM EDTRiver Flood WarningPHIMorris5 days
Sep 6, 4:35 PM EDTRiver Flood WarningPHIPassaic4 days
Sep 6, 5:43 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Salem3 hr
Sep 6, 5:45 PM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Morris, Somerset3 hr
Sep 6, 6:10 PM EDTAreal Flood WarningPHISussex, Warren71 hr
Sep 6, 6:48 PM EDTAreal Flood WarningPHIHunterdon, Mercer, Morris, Somerset31 hr
Sep 5, 8:19 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Lehigh, Montgomery, Northampton116 min
Sep 5, 9:32 PM EDTAreal Flood WarningPHIMontgomery9 hr
Sep 5, 10:18 PM EDTFlash Flood WarningPHILehigh, Northampton4 hr
Sep 5, 10:53 PM EDTAreal Flood AdvisoryPHIChester, Montgomery3 hr
Sep 5, 11:25 PM EDTFlash Flood WarningPHIBerks4 hr
Sep 6, 1:42 AM EDTAreal Flood AdvisoryPHIChester, Montgomery3 hr
Sep 6, 2:09 AM EDTAreal Flood AdvisoryPHILehigh, Northampton3 hr
Sep 6, 3:40 AM EDTAreal Flood WarningPHIBerks3 hr
Sep 6, 5:49 PM EDTAreal Flood WarningPHIPhiladelphia20 hr
Sep 6, 6:32 PM EDTAreal Flood WarningPHIMontgomery26 hr
Sep 6, 6:38 PM EDTAreal Flood WarningPHIMontgomery, Philadelphia23 hr
Sep 6, 6:44 PM EDTAreal Flood WarningPHIChester, Delaware15 hr
Sep 6, 7:03 PM EDTRiver Flood WarningPHIChester16 hr
Sep 6, 7:41 PM EDTRiver Flood WarningPHIDelaware5 hr
Sep 6, 7:52 PM EDTRiver Flood WarningPHIBucks52 hr
Sep 6, 1:19 AM EDTSpecial Weather StatementPHIKent, Queen Anne's56 min
Sep 6, 5:26 PM EDTAreal Flood AdvisoryPHICaroline, Cecil, Kent, Queen Anne's, Talbot3 hr
Sep 6, 5:44 PM EDTSpecial Weather StatementPHICaroline2 hr
Sep 6, 4:24 PM EDTRiver Flood WarningPHINew Castle16 hr
Sep 6, 7:59 PM EDTRiver Flood WarningPHINew Castle4 hr

Nearby

Special 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.