Alert archive / Maryland / Special Weather Statements in 2010

Special Weather Statement, NWS Philadelphia/Mount Holly

September 30, 2010Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 30, 2010, 12:15 PM EDT for Queen Anne's County, Maryland. It was in force for 45 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 30, 2010, 12:15 PM EDT (16:15 UTC)
Expired: Sep 30, 2010, 1:00 PM EDT
In force: 45 min
Issued by: NWS Philadelphia/Mount Holly

County Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 74 km from the middle of the area, began a volume at 16:16 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, 4.3 hours before the alert went out and 96 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: 47 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 449 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 514 m²/s²
0-3 km storm-relative helicity: 665 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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 30, 11:24 AM EDT, 51 minutes earlier.

Area forecast discussion, Sep 30, 11:24 AM EDT, 51 minutes before

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Hazardous weather outlook, Sep 30, 10:58 AM EDT, 1 hour 17 minutes before

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In the hours before

Special weather statement, Sep 30, 7:33 AM EDT, 4 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
733 AM EDT THU SEP 30 2010

NJZ007-PAZ054-055-060>062-067>069-301330-
BERKS PA-BUCKS PA-CARBON PA-CHESTER PA-LEHIGH PA-MONROE PA-
MONTGOMERY PA-NORTHAMPTON PA-WARREN NJ-
733 AM EDT THU SEP 30 2010

...AREAS OF HEAVY RAIN WILL CONTINUE THROUGH THE MORNING COMMUTE...

AREAS OF RAIN WITH EMBEDDED HEAVY DOWNPOURS WERE MOVING NORTH
THROUGH THE AREA THIS MORNING. UP TO ONE INCH OF RAIN IS POSSIBLE IN
SOME OF THE HEAVIER SHOWERS, AND THIS WILL RESULT IN PONDING OF
WATER ON ROADWAYS. USE CAUTION WHEN DRIVING ABOUT THIS MORNING.

MORE RAIN IS EXPECTED LATER THIS MORNING INTO THE EVENING HOURS. A
FLOOD WATCH REMAIN IN EFFECT THROUGH FRIDAY AFTERNOON.

LAT...LON 4116 7516 4115 7509 4109 7503 4110 7499
      4091 7482 4068 7502 4059 7519 4056 7519
      4056 7513 3973 7582 4067 7589 4074 7578
      4092 7599 4100 7575 4108 7578 4114 7569
      4113 7564 4123 7554 4126 7514

JJM

Special weather statement, Sep 30, 11:21 AM EDT, 54 minutes before

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Special weather statement, Sep 30, 12:15 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
Sep 30, 7:33 AM EDT	Special Weather Statement	PHI	Warren	117 min
Sep 30, 1:51 PM EDT	Coastal Flood Warning	PHI	Cumberland, Salem	5 hr
Sep 30, 2:19 PM EDT	Areal Flood Warning	PHI	Camden, Cumberland, Gloucester, Salem	6 hr
Sep 30, 6:18 PM EDT	Special Weather Statement	PHI	Salem	117 min
Sep 30, 6:50 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	40 min
Sep 30, 7:37 PM EDT	Special Weather Statement	PHI	Gloucester	113 min
Sep 30, 7:50 PM EDT	Areal Flood Warning	PHI	Camden, Cumberland, Gloucester, Hunterdon, Salem, Sussex and 1 more	16 hr
Sep 30, 6:06 AM EDT	Areal Flood Warning	PHI	Berks, Chester	4 hr
Sep 30, 8:03 AM EDT	Areal Flood Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery	4 hr
Sep 30, 9:31 AM EDT	Areal Flood Warning	PHI	Lehigh, Monroe, Northampton	3 hr
Sep 30, 1:48 PM EDT	Areal Flood Warning	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	6 hr
Sep 30, 2:12 PM EDT	Areal Flood Warning	PHI	Berks	6 hr
Sep 30, 6:55 PM EDT	River Flood Warning	PHI	Chester, Delaware	30 hr
Sep 30, 6:57 PM EDT	River Flood Warning	PHI	Berks, Montgomery	16 hr
Sep 30, 8:00 AM EDT	Tornado Warning	PHI	Kent	45 min
Sep 30, 11:21 AM EDT	Special Weather Statement	PHI	Kent, Talbot	39 min
Sep 30, 1:37 PM EDT	Special Weather Statement	PHI	Queen Anne's, Talbot	38 min
Sep 30, 3:15 PM EDT	Special Weather Statement	PHI	Caroline	45 min
Sep 30, 3:47 PM EDT	Special Weather Statement	PHI	Caroline	58 min
Sep 30, 6:23 PM EDT	Special Weather Statement	PHI	Caroline	37 min
Sep 30, 7:49 PM EDT	Coastal Flood Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	6 hr

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.