Alert archive / Maryland / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 251, NWS Philadelphia/Mount Holly

August 14, 2008Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 14, 2008, 6:55 PM EDT for Cecil County, Maryland. It was in force for 49 min. 1 report 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: Aug 14, 2008, 6:55 PM EDT (22:55 UTC)
Expired: Aug 14, 2008, 7:44 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 97 km from the middle of the area, began a volume at 22:55 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

Time	Report	Where	Remark
Aug 14, 7:40 PM EDT	TSTM WND DMG	Perryville, MD	NUMEROUS REPORTS OF POWER LINES KNOCKED DOWN FROM PERRYVILLE TO ELKTON NEAR INTERSTATE 95.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.9 hours before the alert went out and 13 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: 374 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 966 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 142255
SVRPHI
MDC015-150000-
/O.NEW.KPHI.SV.W.0251.080814T2255Z-080815T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
655 PM EDT THU AUG 14 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CECIL COUNTY IN NORTHEAST MARYLAND...

* UNTIL 800 PM EDT

* AT 652 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS TO 60 MPH.  THIS STORM WAS LOCATED NEAR
  WOODLAWN...OR ABOUT 15 MILES WEST OF ELKTON...AND MOVING NORTHEAST
  AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHARLESTOWN BY 700 PM...
  NORTH EAST...BAY VIEW AND ZION BY 705 PM...
  PLEASANT HILL BY 710 PM...
  CHERRY HILL...ANDORA...FAIR HILL AND ELKTON BY 715 PM...
  BARKSDALE BY 720 PM...

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

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

LAT...LON 3971 7580 3944 7579 3939 7605 3944 7600
      3946 7602 3955 7598 3956 7599 3953 7600
      3954 7608 3962 7616 3965 7617 3968 7622
      3972 7623
TIME...MOT...LOC 2255Z 240DEG 30KT 3958 7605

$$

GORSE

1 follow-up statement

000 
WWUS51 KPHI 142344
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
744 PM EDT THU AUG 14 2008

MDC015-142353-
/O.CAN.KPHI.SV.W.0251.000000T0000Z-080815T0000Z/
CECIL MD-
744 PM EDT THU AUG 14 2008

...THE SEVERE THUNDERSTORM WARNING FOR CECIL COUNTY IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...THEREFORE THE WARNING HAS BEEN CANCELLED.

HOWEVER, HEAVY RAIN AND SMALL HAIL ARE STILL EXPECTED WITH THIS 
STORM ALONG WITH FREQUENT CLOUD TO GROUND LIGHTNING.

LAT...LON 3971 7580 3944 7579 3939 7605 3944 7600
      3946 7602 3955 7598 3956 7599 3953 7600
      3954 7608 3962 7616 3965 7617 3968 7622
      3972 7623
TIME...MOT...LOC 2343Z 240DEG 30KT 3978 7560

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	57 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2008 Every severe thunderstorm warning in 2008

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.