Alert archive / Maryland / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 134, NWS Philadelphia/Mount Holly

July 25, 2009Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 25, 2009, 9:41 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 64 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 25, 2009, 9:41 PM EDT (01:41 UTC)
Expired
Jul 25, 2009, 10:45 PM EDT
In force
64 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Caroline County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 63 km from the middle of the area, began a volume at 01:44 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.

What was reported inside it

TimeReportWhereRemark
Jul 25, 10:00 PM EDTTSTM WND DMGEaston, MDSEVERAL TREES, WIRES, AND TELEPHONE POLES DOWN IN EASTON.
Jul 25, 10:05 PM EDTHAIL 0.75Centreville, MDPENNY TO NICKEL SIZE HAIL REPORTED IN CENTREVILLE.
Jul 25, 10:18 PM EDTTSTM WND DMGPreston, MDTREES DOWN ON TRANSFORMER IN PRESTON.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.7 hours before the alert went out and 107 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 00:00Z on 2009-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 754 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2009-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 207 square meters per square second.193958Sfc1 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
754 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
1179 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
207 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.4
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 260141
SVRPHI
MDC011-035-041-260245-
/O.NEW.KPHI.SV.W.0134.090726T0141Z-090726T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
941 PM EDT SAT JUL 25 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAROLINE COUNTY IN EASTERN MARYLAND...
  TALBOT COUNTY IN EASTERN MARYLAND...
  THIS INCLUDES THE CITY OF EASTON...
  SOUTHERN QUEEN ANNES COUNTY IN NORTHEAST MARYLAND...

* UNTIL 1045 PM EDT

* AT 941 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  TALBOT...OR 14 MILES WEST OF EASTON...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ST. MICHAELS AROUND 950 PM EDT...
  COPPERVILLE AROUND 955 PM EDT...
  SKIPTON AND WYE MILLS AROUND 1010 PM EDT...
  CORDOVA AND STARR AROUND 1020 PM EDT...
  QUEEN ANNE AND GRIFFIN AROUND 1025 PM EDT...
  JUMPTOWN AROUND 1030 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3868 7619 3866 7621 3873 7625 3872 7632
      3883 7631 3887 7626 3883 7620 3894 7624
      3890 7624 3893 7628 3884 7636 3885 7637
      3899 7634 3898 7621 3907 7604 3912 7576
      3868 7572 3869 7590 3858 7603
TIME...MOT...LOC 0141Z 255DEG 24KT 3884 7631

$$

NIERENBERG
1 follow-up statement
000 
WWUS51 KPHI 260217
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1017 PM EDT SAT JUL 25 2009

MDC011-035-041-260245-
/O.CON.KPHI.SV.W.0134.000000T0000Z-090726T0245Z/
CAROLINE MD-QUEEN ANNES MD-TALBOT MD-
1017 PM EDT SAT JUL 25 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR TALBOT...SOUTHERN QUEEN ANNES AND CAROLINE COUNTIES...

AT 1017 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR MATTHEWS...OR 8 MILES NORTHEAST OF EASTON...MOVING EAST
AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  8 MILES SOUTH OF RIDGELY BY 1025 PM EDT...
  DENTON AND 6 MILES NORTH OF AGNER BY 1030 PM EDT...
  9 MILES SOUTH OF GREENSBORO BY 1035 PM EDT...
  SMITHVILLE BY 1040 PM EDT...

LAT...LON 3868 7619 3866 7621 3873 7625 3872 7632
      3883 7631 3887 7626 3883 7620 3894 7624
      3890 7624 3893 7628 3884 7636 3885 7637
      3899 7634 3898 7621 3907 7604 3912 7576
      3868 7572 3869 7590 3858 7603
TIME...MOT...LOC 0217Z 255DEG 24KT 3882 7593

$$

OHARA

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 10:29 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot61 min
Jul 26, 4:19 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot44 min
Jul 26, 7:05 PM EDTSevere Thunderstorm WarningPHICecil70 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2009Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.