Alert archive / Maryland / Special Weather Statements in 2010

Special Weather Statement, NWS Philadelphia/Mount Holly

June 4, 2010Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 4, 2010, 6:03 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 87 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: Jun 4, 2010, 6:03 PM EDT (22:03 UTC)
Expired: Jun 4, 2010, 7:30 PM EDT
In force: 87 min
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 80 km from the middle of the area, began a volume at 22:03 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, 10.1 hours before the alert went out and 123 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: 476 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1158 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: 48 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 Jun 4, 3:32 PM EDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jun 4, 3:32 PM EDT, 2 hours 31 minutes before

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Hazardous weather outlook, Jun 4, 3:17 PM EDT, 2 hours 46 minutes before

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In the hours before

Special weather statement, Jun 4, 1:45 PM EDT, 4 hours 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
145 PM EDT FRI JUN 4 2010

DEZ001-MDZ008-PAZ067-041915-
CECIL MD-CHESTER PA-NEW CASTLE DE-
145 PM EDT FRI JUN 4 2010

...A STRONG THUNDERSTORM WILL AFFECT CECIL...CHESTER AND NEW CASTLE
COUNTIES...

AT 139 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
DEVELOPING STRONG THUNDERSTORM 15 MILES NORTHWEST OF ELKTON...MOVING
NORTHEAST AT 15 MPH. THE THUNDERSTORM WILL BE NEAR LOMBARD...CALVERT
AROUND 200 PM...BLAKE...FAIR HILL AROUND 215
PM...KEMBLESVILLE...WEST GROVE AROUND 230
PM...LADENBERG...TOUGHKENAMON AROUND 245 PM...KENNETT SQUARE AND
ASHLAND AROUND 300 PM.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM.

EXPECT LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER TREES
WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

THERE ARE OTHER THUNDERSTORMS DEVELOPING OVER THE LOWER SUSQUEHANNA
VALLEY THAT COULD AFFECT CHESTER COUNTY AFTER 230 PM.

LAT...LON 3976 7609 3987 7601 3992 7601 4003 7595
      4010 7595 4018 7577 3966 7555 3962 7560
      3962 7610 3972 7617

TFG

Special weather statement, Jun 4, 2:59 PM EDT, 3 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
259 PM EDT FRI JUN 4 2010

MDZ008-PAZ067-042030-
CECIL MD-CHESTER PA-
259 PM EDT FRI JUN 4 2010

...A STRONG THUNDERSTORM WILL AFFECT CECIL AND CHESTER COUNTIES...

AT 255 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 16 MILES SOUTH OF LANCASTER...MOVING EAST AT 20
MPH. THE THUNDERSTORM WILL BE NEAR ROCK SPRINGS...RICHARDSMERE AROUND
330 PM...GLEN ROY...MOUNT VERNON AROUND 345 PM...OXFORD...LOMBARD
AROUND 400 PM...KEMBLESVILLE AND GLEN WESTOVER AROUND 415 PM.

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.

EXPECT LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER TREES
WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

THIS STORM IS CONTINUING TO INTENSIFY AND IT MAY BECOME NECESSARY
FOR A SEVERE THUNDERSTORM WARNING TO BE ISSUED IF THIS TREND
CONTINUES.

LAT...LON 3973 7615 3975 7610 3978 7607 3985 7603
      3987 7601 3992 7601 4000 7598 4005 7571
      3955 7583 3967 7620 3969 7623 3972 7624

TFG

Special weather statement, Jun 4, 6:03 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 8:05 PM EDT	Special Weather Statement	PHI	Berks	55 min
Jun 3, 8:51 PM EDT	Special Weather Statement	PHI	Chester	54 min
Jun 4, 1:45 PM EDT	Special Weather Statement	PHI	Chester	90 min
Jun 4, 2:59 PM EDT	Special Weather Statement	PHI	Chester	91 min
Jun 4, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Chester	76 min

Nearby

Special Weather Statements in Maryland, 2010 Every special weather statement in 2010

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.