Alert archive / Delaware / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

September 3, 2012New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 3, 2012, 2:39 PM EDT for New Castle County, Delaware; Cecil County, Maryland. 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 3, 2012, 2:39 PM EDT (18:39 UTC)
Expired: Sep 3, 2012, 3:45 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 18:42 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.7 hours before the alert went out and 155 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: 383 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 718 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 86 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.

611 
WWUS81 KPHI 031839
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
239 PM EDT MON SEP 3 2012

DEZ001-002-MDZ008-PAZ067-031945-
CECIL MD-CHESTER PA-KENT DE-NEW CASTLE DE-
239 PM EDT MON SEP 3 2012

...STRONG THUNDERSTORMS WILL AFFECT CECIL...CHESTER...KENT AND NEW
CASTLE COUNTIES...

AT 234 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 14 MILES WEST OF
NEWARK TO 13 MILES SOUTH OF NEWARK TO 15 MILES NORTHWEST OF DOVER...
MOVING NORTH AT 5 MPH. THE THUNDERSTORMS WILL BE NEAR BOHEMIAS MILLS
AROUND 245 PM...ZION...CALVERT...TOWNSEND AROUND 250 PM...CHESAPEAKE
CITY AROUND 255 PM...MIDDLETOWN AROUND 300 PM...GLEN ROY...
CHAMBERSVILLE AROUND 305 PM...LOMBARD AND BRANTWOOD AROUND 310 PM.

VERY HEAVY RAINFALL WILL OCCUR OVER AREAS THAT RECEIVED HEAVY RAINS
EARLIER. BE ALERT FOR THE POSSIBILITY OF LOCALIZED FLOODING.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 3974 7612 3974 7610 3988 7600 3998 7599
      3964 7558 3960 7560 3963 7557 3963 7556
      3952 7555 3946 7558 3941 7552 3918 7564
      3931 7576 3938 7577 3938 7583 3968 7615

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 6:05 AM EDT	Areal Flood Advisory	PHI	Salem	3 hr
Sep 3, 8:05 AM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	3 hr
Sep 3, 8:57 AM EDT	Areal Flood Warning	PHI	Atlantic, Camden, Gloucester	2 hr
Sep 3, 10:28 AM EDT	Special Weather Statement	PHI	Burlington, Camden	62 min
Sep 3, 11:14 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden	2 hr
Sep 3, 3:00 PM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Mercer, Salem	49 hr
Sep 3, 3:47 PM EDT	Special Marine Warning	PHI		58 min
Sep 3, 3:50 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	55 min
Sep 3, 3:58 PM EDT	Areal Flood Advisory	PHI	Salem	3 hr
Sep 3, 4:39 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland, Gloucester, Salem	66 min
Sep 3, 4:59 PM EDT	Areal Flood Advisory	PHI	Cumberland	116 min
Sep 3, 5:44 PM EDT	Special Marine Warning	PHI		31 min
Sep 3, 5:45 PM EDT	Special Weather Statement	PHI	Atlantic	60 min
Sep 3, 6:25 PM EDT	Areal Flood Advisory	PHI	Atlantic, Ocean	2 hr
Sep 3, 6:28 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May	103 min
Sep 3, 6:49 PM EDT	Small Craft Advisory	PHI		3 hr
Sep 3, 7:29 PM EDT	Areal Flood Advisory	PHI	Atlantic	115 min
Sep 3, 12:24 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware	3 hr
Sep 3, 12:58 AM EDT	Flash Flood Warning	PHI	Chester, Delaware	5 hr
Sep 3, 4:19 AM EDT	River Flood Warning	PHI	Delaware	91 min
Sep 3, 4:44 AM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	3 hr
Sep 3, 6:24 AM EDT	Areal Flood Warning	PHI	Chester	4 hr
Sep 3, 8:23 AM EDT	Flash Flood Warning	PHI	Delaware	82 min
Sep 3, 9:15 AM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	3 hr
Sep 3, 12:04 PM EDT	Areal Flood Warning	PHI	Chester	4 hr
Sep 3, 2:44 PM EDT	Areal Flood Advisory	PHI	Chester	119 min
Sep 3, 5:27 PM EDT	Areal Flood Warning	PHI	Delaware	3 hr
Sep 3, 6:41 PM EDT	River Flood Warning	PHI	Delaware	2 hr
Sep 3, 7:31 AM EDT	Flash Flood Warning	PHI	New Castle	2 hr
Sep 3, 1:42 PM EDT	Special Weather Statement	PHI	Sussex	93 min
Sep 3, 1:48 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Sep 3, 1:53 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Sep 3, 2:19 PM EDT	Areal Flood Advisory	PHI	Sussex	114 min
Sep 3, 3:14 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	4 hr
Sep 3, 3:25 PM EDT	Tornado Warning	PHI	Kent	20 min
Sep 3, 11:27 AM EDT	Special Weather Statement	PHI	Talbot	63 min
Sep 3, 11:51 AM EDT	Special Weather Statement	PHI	Cecil	54 min

Nearby

Special Weather Statements in Delaware, 2012 Special Weather Statements in Maryland, 2012 Every special weather statement in 2012

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.