Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

February 11, 20124 states

NWS Philadelphia/Mount Holly issued this special weather statement at Feb 11, 2012, 3:19 PM EST for 4 states. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 11, 2012, 3:19 PM EST (20:19 UTC)
Expired: Feb 11, 2012, 6:15 PM EST
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Queen Anne's County, MD, Talbot County, MD, Salem County, NJ, Berks County, PA, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 20:19 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.3 hours before the alert went out and 145 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: -157 m²/s²
0-3 km storm-relative helicity: -59 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.

542 
WWUS81 KPHI 112019
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
319 PM EST SAT FEB 11 2012

DEZ001>003-MDZ008-012-015-019-020-NJZ016-017-PAZ060-067-070-112315-
BERKS PA-CAROLINE MD-CECIL MD-CHESTER PA-DELAWARE PA-GLOUCESTER NJ-
INLAND SUSSEX DE-KENT DE-KENT MD-NEW CASTLE DE-QUEEN ANNE'S MD-
SALEM NJ-TALBOT MD-
319 PM EST SAT FEB 11 2012

...A LINE OF SNOW SHOWERS WILL AFFECT BERKS...DELAWARE...GLOUCESTER...
NEW CASTLE...CECIL...KENT...CHESTER...TALBOT...CAROLINE...SUSSEX...
QUEEN ANNE'S AND SALEM COUNTIES...

AT 312 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SNOW
SHOWERS ALONG A LINE EXTENDING FROM 80 MILES WEST OF WILKES-BARRE TO
27 MILES NORTHWEST OF BALTIMORE TO 128 MILES SOUTHWEST OF EASTON...
MOVING EAST AT 30 MPH. THE SNOW SHOWERS WILL AFFECT STEVENSVILLE...ROCK
SPRINGS...OCTORARO...CONOWINGO AROUND 445 PM...TILGHMAN ISLAND...ROCK
SPRINGS...RICHARDSMERE...CHESTER AROUND 450 PM...WEST NOTTINGHAM AND
TALBOT AROUND 455 PM.

WIND GUSTS BETWEEN 30 TO 40 MPH ARE POSSIBLE WITH THE SHOWERS. 
THE MORE INTENSE SNOW SHOWERS WILL DROP VISIBILITIES BELOW ONE MILE 
AND TEMPERATURES TO NEAR FREEZING.

USE CAUTION IF YOU ARE TRAVELING IN THESE AREAS INTO EARLY THIS 
EVENING. BE ALERT FOR VARYING VISIBILITIES AND ROAD CONDITIONS.
GIVE YOURSELF PLENTY OF DISTANCE BETWEEN YOURSELF AND THE VEHICLES 
AROUND YOU. LOCALIZED ACCUMULATIONS OF UP TO HALF AN INCH ARE 
POSSIBLE. RIGHT NOW THERE IS A GAP BETWEEN THE SNOW SHOWERS AND THE 
DROP IN TEMPERATURES BELOW FREEZING. WHEN TEMPERATURES DO FALL BELOW 
FREEZING LATER THIS EVENING ANY SLUSH OR STANDING WATER ON UNTREATED 
ROADWAYS WILL FREEZE AND MAKE FOR EVEN MORE HAZARDOUS TRAVELING 
CONDITIONS.
 

LAT...LON 3845 7569 3870 7581 3857 7604 3876 7640
      3877 7640 3875 7635 3952 7599 3972 7623
      4014 7589 4050 7643 4068 7591 4045 7553
      4024 7570 3989 7514 3952 7518 3938 7543
      3948 7558 3900 7531 3845 7545

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 11, 3:37 AM EST	Gale Warning	PHI		45 hr
Feb 11, 3:37 PM EST	Wind Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	12 hr
Feb 11, 5:49 PM EST	Special Weather Statement	PHI	Salem	86 min
Feb 11, 6:16 PM EST	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	104 min

Nearby

Special Weather Statements in Maryland, 2012 Special Weather Statements in Pennsylvania, 2012 Special Weather Statements in Delaware, 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.