Alert archive / Maryland / Special Weather Statements in 2010

Special Weather Statement, NWS Philadelphia/Mount Holly

September 30, 2010Kent County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 30, 2010, 11:21 AM EDT for Kent County, Talbot County, Maryland. It was in force for 39 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, 11:21 AM EDT (15:21 UTC)
Expired
Sep 30, 2010, 12:00 PM EDT
In force
39 min
Issued by
NWS Philadelphia/Mount Holly

Counties Kent County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 15:21 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, 3.4 hours before the alert went out and 98 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2010-09-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2010-09-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 514 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

384 
WWUS81 KPHI 301521
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1121 AM EDT THU SEP 30 2010

MDZ012-015-019-301600-
KENT MD-QUEEN ANNE'S MD-TALBOT MD-
1121 AM EDT THU SEP 30 2010

...A STRONG THUNDERSTORM WILL AFFECT KENT...QUEEN ANNE'S AND TALBOT
COUNTIES...

AT 1115 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 14 MILES SOUTHWEST OF EASTON...MOVING NORTH AT 60
MPH. THE THUNDERSTORM WILL BE NEAR COPPERVILLE AROUND 1130 AM...
STEVENSVILLE SOUTH...GRASONVILLE AROUND 1135 AM...CHESTER...
STEVENSVILLE...OVERTON...QUEENSTOWN AROUND 1140 AM...ROCK HALL AROUND
1150 AM AND LANGFORD AROUND 1155 AM.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.

LAT...LON 3873 7625 3866 7635 3874 7638 3887 7626
      3882 7620 3894 7624 3890 7625 3890 7626
      3892 7627 3893 7628 3891 7632 3884 7638
      3886 7639 3905 7631 3900 7618 3916 7628
      3938 7611 3863 7615

$$

FORECASTER:AMC

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 30, 7:33 AM EDTSpecial Weather StatementPHIWarren117 min
Sep 30, 1:51 PM EDTCoastal Flood WarningPHICumberland, Salem5 hr
Sep 30, 2:19 PM EDTAreal Flood WarningPHICamden, Cumberland, Gloucester, Salem6 hr
Sep 30, 6:18 PM EDTSpecial Weather StatementPHISalem117 min
Sep 30, 6:50 PM EDTSpecial Weather StatementPHIGloucester, Salem40 min
Sep 30, 7:37 PM EDTSpecial Weather StatementPHIGloucester113 min
Sep 30, 7:50 PM EDTAreal Flood WarningPHICamden, Cumberland, Gloucester, Hunterdon, Salem, Sussex and 1 more16 hr
Sep 30, 6:06 AM EDTAreal Flood WarningPHIBerks, Chester4 hr
Sep 30, 8:03 AM EDTAreal Flood WarningPHIBerks, Carbon, Chester, Lehigh, Montgomery4 hr
Sep 30, 9:31 AM EDTAreal Flood WarningPHILehigh, Monroe, Northampton3 hr
Sep 30, 1:48 PM EDTAreal Flood WarningPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more6 hr
Sep 30, 2:12 PM EDTAreal Flood WarningPHIBerks6 hr
Sep 30, 6:55 PM EDTRiver Flood WarningPHIChester, Delaware30 hr
Sep 30, 6:57 PM EDTRiver Flood WarningPHIBerks, Montgomery16 hr
Sep 30, 8:00 AM EDTTornado WarningPHIKent45 min
Sep 30, 12:15 PM EDTSpecial Weather StatementPHIQueen Anne's45 min
Sep 30, 1:37 PM EDTSpecial Weather StatementPHIQueen Anne's, Talbot38 min
Sep 30, 3:15 PM EDTSpecial Weather StatementPHICaroline45 min
Sep 30, 3:47 PM EDTSpecial Weather StatementPHICaroline58 min
Sep 30, 6:23 PM EDTSpecial Weather StatementPHICaroline37 min
Sep 30, 7:49 PM EDTCoastal Flood WarningPHICaroline, Kent, Queen Anne's, Talbot6 hr

Nearby

Special Weather Statements in Maryland, 2010Every 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.