Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

October 19, 2011Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 19, 2011, 11:30 PM EDT for Sussex County, Delaware. It was in force for 90 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
Oct 19, 2011, 11:30 PM EDT (03:30 UTC)
Expired
Oct 20, 2011, 1:00 AM EDT
In force
90 min
Issued by
NWS Philadelphia/Mount Holly

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 35 km from the middle of the area, began a volume at 03:33 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, 3.5 hours before the alert went out and 75 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 2011-10-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 96 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 2011-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.1939587897Sfc1 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
96 J/kg
Mixed-layer CIN
-166 J/kg
Mixed-layer LCL
617 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

706 
WWUS81 KPHI 200330
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1130 PM EDT WED OCT 19 2011

DEZ003-200500-
INLAND SUSSEX DE-
1130 PM EDT WED OCT 19 2011

...SHOWERS WITH HEAVY RAINFALL WILL AFFECT SUSSEX COUNTY...

AT 1122 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS WITH HEAVY RAINFALL ALONG A LINE EXTENDING FROM 26 MILES WEST
OF SALISBURY TO 48 MILES SOUTHWEST OF SALISBURY...MOVING NORTHEAST AT
30 MPH. THE SHOWERS WILL BE NEAR SEAFORD AROUND 1240 AM AND
BRIDGEVILLE AROUND 1250 AM.

SOUTH WIND GUSTS OF 35 TO 40 MPH ARE POSSIBLE WITH THESE SHOWERS.

LAT...LON 3846 7570 3847 7571 3855 7572 3865 7572
      3867 7571 3881 7557 3845 7558

$$

FORECASTER: DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 19, 9:56 PM EDTSpecial Weather StatementPHIWarren49 min
Oct 19, 10:26 PM EDTSpecial Weather StatementPHIMercer, Middlesex, Monmouth, Morris, Somerset64 min
Oct 19, 11:48 PM EDTSpecial Weather StatementPHISussex12 min
Oct 20, 12:09 AM EDTSpecial Weather StatementPHICumberland66 min
Oct 20, 2:41 AM EDTGale WarningPHI13 hr
Oct 20, 4:22 AM EDTCoastal Flood StatementPHIBurlington, Camden, Gloucester, Salem4 hr
Oct 20, 2:11 AM EDTCoastal Flood AdvisoryPHICecil, Kent, Queen Anne's3 hr
Oct 20, 8:25 AM EDTCoastal Flood AdvisoryPHICaroline, Cecil, Kent, Queen Anne's, Talbot9 hr
Oct 20, 5:09 PM EDTCoastal Flood AdvisoryPHICaroline, Cecil, Kent, Queen Anne's, Talbot3 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.