Alert archive / Delaware / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

September 11, 2011Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 11, 2011, 1:54 PM EDT for Kent County, Delaware. It was in force for 66 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 11, 2011, 1:54 PM EDT (17:54 UTC)
Expired: Sep 11, 2011, 3:00 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 32 km from the middle of the area, began a volume at 17:55 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, 5.9 hours before the alert went out and 131 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: 370 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1154 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this special weather statement went out at Sep 11, 9:55 AM EDT, 3 hours 59 minutes earlier.

Area forecast discussion, Sep 11, 9:55 AM EDT, 3 hours 59 minutes before

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Hazardous weather outlook, Sep 11, 3:52 AM EDT, 10 hours 2 minutes before

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In the hours before

Special weather statement, Sep 11, 1:54 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
154 PM EDT SUN SEP 11 2011

DEZ002-111900-
KENT DE-
154 PM EDT SUN SEP 11 2011

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF KENT COUNTY...

AT 152 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 8 MILES SOUTHWEST OF DOVER...MOVING EAST AT 10
MPH. THE THUNDERSTORM WILL BE NEAR WOODSIDE AND CAMDEN AROUND 215
PM...WOODSIDE EAST AND VIOLA AROUND 230 PM...MAGNOLIA AND RIVERVIEW
AROUND 245 PM AND FREDERICA AROUND 300 PM.

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

LAT...LON 3918 7543 3893 7544 3900 7572 3921 7572

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 4:01 AM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester	12 hr
Sep 11, 4:14 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cumberland, Ocean	2 hr
Sep 11, 5:10 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Ocean	81 min
Sep 11, 7:30 PM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester	10 hr
Sep 11, 2:00 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	3 hr
Sep 11, 7:55 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Sep 11, 3:52 PM EDT	Special Weather Statement	PHI	New Castle	53 min

Nearby

Special Weather Statements in Delaware, 2011 Every 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.