Alert archive / Maryland / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

August 7, 2011Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 7, 2011, 4:50 PM EDT for Cecil County, Maryland. It was in force for 40 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 7, 2011, 4:50 PM EDT (20:50 UTC)
Expired: Aug 7, 2011, 5:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 112 km from the middle of the area, began a volume at 20:54 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, 8.8 hours before the alert went out and 135 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: 1180 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

587 
WWUS81 KPHI 072050
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
450 PM EDT SUN AUG 7 2011

MDZ008-PAZ067-072130-
CECIL MD-CHESTER PA-
450 PM EDT SUN AUG 7 2011

...THUNDERSTORMS WILL AFFECT CECIL AND POSSIBLY CHESTER COUNTIES...

AT 445 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS ALONG A LINE EXTENDING FROM 23 MILES SOUTH OF 
LANCASTER TO 24 MILES NORTH OF BALTIMORE...MOVING EAST AT 15 MPH. THE
THUNDERSTORMS WILL BE NEAR ROCK SPRINGS AROUND 510 PM...CONOWINGO 
AROUND 515 PM...RICHARDSMERE AROUND 520 PM...OCTORARO AROUND 525 PM 
AND WEST NOTTINGHAM AROUND 530 PM.

BRIEF BUT HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE 
WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES.

LAT...LON 3973 7623 3973 7615 3974 7614 3971 7582
      3954 7604 3954 7607 3962 7616 3965 7617
      3969 7623 3972 7624

$$

FORECASTER: DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 8:49 PM EDT	Flood Watch	PHI	Morris, Sussex, Warren	9 hr
Aug 6, 10:33 PM EDT	Areal Flood Advisory	PHI	Warren	6 hr
Aug 7, 12:42 AM EDT	Special Weather Statement	PHI	Morris	63 min
Aug 7, 1:32 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	3 hr
Aug 7, 1:54 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
Aug 7, 3:56 AM EDT	Special Weather Statement	PHI	Hunterdon	64 min
Aug 7, 4:45 AM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	60 min
Aug 7, 5:10 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	81 min
Aug 7, 5:30 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex	60 min
Aug 7, 6:03 AM EDT	Flash Flood Watch	PHI	Sussex, Warren	14 hr
Aug 7, 3:25 PM EDT	Special Weather Statement	PHI	Mercer	35 min
Aug 7, 3:34 PM EDT	Special Weather Statement	PHI	Warren	26 min
Aug 7, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	27 min
Aug 7, 4:19 PM EDT	Special Weather Statement	PHI	Monmouth	41 min
Aug 7, 5:02 PM EDT	Special Weather Statement	PHI	Sussex	28 min
Aug 7, 6:49 PM EDT	Special Weather Statement	PHI	Sussex	41 min
Aug 7, 7:11 PM EDT	Special Weather Statement	PHI	Sussex	49 min
Aug 7, 7:35 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Aug 6, 10:06 PM EDT	Special Weather Statement	PHI	Berks	84 min
Aug 6, 10:14 PM EDT	Special Weather Statement	PHI	Pike	61 min
Aug 7, 12:48 AM EDT	Special Weather Statement	PHI	Montgomery	57 min
Aug 7, 2:29 AM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	3 hr
Aug 7, 3:07 PM EDT	Special Weather Statement	PHI	Philadelphia	23 min
Aug 7, 7:20 PM EDT	Special Weather Statement	PHI	Monroe	40 min
Aug 7, 3:02 PM EDT	Special Weather Statement	PHI	Cecil	28 min
Aug 7, 5:39 PM EDT	Special Weather Statement	PHI	Cecil	36 min
Aug 7, 6:31 PM EDT	Special Weather Statement	PHI	Kent	29 min

Nearby

Special Weather Statements in Maryland, 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.