Alert archive / Maryland / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 203, NWS Philadelphia/Mount Holly

August 26, 2012Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 26, 2012, 3:15 PM EDT for Talbot County, Maryland. It was in force for 25 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
Aug 26, 2012, 3:15 PM EDT (19:15 UTC)
Expired
Aug 26, 2012, 3:40 PM EDT
In force
25 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Talbot County, MD

The radar

The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 19:18 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, 7.3 hours before the alert went out and 108 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 2012-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 926 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 2012-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 square meters per square second.1939Sfc1 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
926 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

130 
WUUS51 KPHI 261915
SVRPHI
MDC041-262000-
/O.NEW.KPHI.SV.W.0203.120826T1915Z-120826T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
315 PM EDT SUN AUG 26 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL TALBOT COUNTY IN EASTERN MARYLAND...

* UNTIL 400 PM EDT

* AT 314 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  OXFORD...AND MOVING NORTH AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  OXFORD AROUND 345 PM EDT...
  8 MILES SOUTHWEST OF EASTON AROUND 400 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE
NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS
SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3864 7618 3867 7618 3866 7620 3868 7623
      3872 7626 3870 7627 3871 7630 3875 7631
      3878 7607 3862 7608 3862 7614
TIME...MOT...LOC 1915Z 173DEG 6KT 3864 7618

$$

IOVINO
1 follow-up statement
146 
WWUS51 KPHI 261940
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
340 PM EDT SUN AUG 26 2012

MDC041-261948-
/O.CAN.KPHI.SV.W.0203.000000T0000Z-120826T2000Z/
TALBOT MD-
340 PM EDT SUN AUG 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TALBOT COUNTY IS
CANCELLED...

THE THREAT OF DAMAGING WIND GUSTS HAS SUBSIDED IN CENTRAL TALBOT 
COUNTY. HOWEVER...VERY HEAVY RAIN IS STILL A CONCERN AND THE AREA 
REMAINS UNDER A FLASH FLOOD WARNING UNTIL 530 PM.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3864 7618 3867 7618 3866 7620 3868 7623
      3872 7626 3870 7627 3871 7630 3875 7631
      3878 7607 3862 7608 3862 7614
TIME...MOT...LOC 1938Z 173DEG 6KT 3868 7619

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 26, 7:43 AM EDTSpecial Weather StatementPHICaroline, Kent, Queen Anne's2 hr
Aug 26, 11:48 AM EDTSpecial Weather StatementPHICaroline, Queen Anne's, Talbot117 min
Aug 26, 12:17 PM EDTAreal Flood AdvisoryPHICaroline, Talbot118 min
Aug 26, 12:49 PM EDTAreal Flood AdvisoryPHIKent, Queen Anne's91 min
Aug 26, 1:29 PM EDTFlash Flood WarningPHICaroline, Queen Anne's, Talbot7 hr
Aug 26, 2:22 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot53 min
Aug 26, 2:58 PM EDTFlash Flood WarningPHIKent, Queen Anne's4 hr
Aug 26, 5:36 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot39 min
Aug 26, 5:42 PM EDTTornado WarningPHICaroline19 min
Aug 26, 6:15 PM EDTFlash Flood WarningPHICaroline, Queen Anne's4 hr
Aug 26, 7:39 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot66 min
Aug 26, 7:59 PM EDTAreal Flood WarningPHIQueen Anne's, Talbot15 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2012Every severe thunderstorm warning in 2012

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.