Alert archive / Maryland / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 102, NWS Philadelphia/Mount Holly

July 14, 2017Caroline County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2017, 5:54 PM EDT for Caroline County, Talbot County, Maryland. It was in force for 51 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
Jul 14, 2017, 5:54 PM EDT (21:54 UTC)
Expired
Jul 14, 2017, 6:45 PM EDT
In force
51 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 67 km from the middle of the area, began a volume at 21:53 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 14, 1:40 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.9 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 12:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 403 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 12:00Z on 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
403 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
1367 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

810 
WUUS51 KPHI 142154
SVRPHI
MDC011-041-142245-
/O.NEW.KPHI.SV.W.0102.170714T2154Z-170714T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
554 PM EDT FRI JUL 14 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Talbot County in eastern Maryland...
  Southwestern Caroline County in eastern Maryland...

* Until 645 PM EDT

* At 553 PM EDT, a severe thunderstorm was located over St. Michaels,
  or 9 miles west of Easton, moving southeast at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* This severe thunderstorm will be near,
  Easton and Oxford around 605 PM EDT. 
  Trappe and Hambleton around 610 PM EDT. 
  Windyhill and Tanyard around 615 PM EDT. 
  Preston and Choptank around 620 PM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

&&

LAT...LON 3876 7633 3884 7628 3878 7621 3882 7619
      3873 7586 3866 7596 3860 7599 3857 7604
      3863 7608 3864 7615 3868 7617 3868 7621
      3871 7624 3876 7622 3871 7628 3878 7629
      3877 7632 3868 7633 3874 7634 3875 7637
TIME...MOT...LOC 2153Z 297DEG 36KT 3879 7624 

HAIL...1.00IN
WIND...60MPH
 
$$

Robertson
1 follow-up statement
534 
WWUS51 KPHI 142238
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
638 PM EDT FRI JUL 14 2017

MDC011-041-142247-
/O.EXP.KPHI.SV.W.0102.000000T0000Z-170714T2245Z/
Talbot MD-Caroline MD-
638 PM EDT FRI JUL 14 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TALBOT AND
SOUTHWESTERN CAROLINE COUNTIES WILL EXPIRE AT 645 PM EDT...
    
The severe thunderstorm which prompted the warning has weakened and 
moved out of the warned area. Therefore, the warning will be allowed 
to expire.  However gusty winds and heavy rain are still possible 
with this thunderstorm.

A severe thunderstorm watch remains in effect until 900 PM EDT for
eastern Maryland.

Remember, a Severe Thunderstorm Warning still remains in effect for 
other portions of Caroline and Talbot counties.

LAT...LON 3876 7633 3884 7628 3878 7621 3882 7619
      3873 7586 3866 7596 3860 7599 3857 7604
      3863 7608 3864 7615 3868 7617 3868 7621
      3871 7624 3876 7622 3871 7628 3878 7629
      3877 7632 3868 7633 3874 7634 3875 7637
TIME...MOT...LOC 2237Z 297DEG 36KT 3859 7575 

$$

Robertson

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 10:03 PM EDTSpecial Weather StatementPHICaroline27 min
Jul 13, 10:15 PM EDTAreal Flood AdvisoryPHICaroline, Talbot4 hr
Jul 14, 9:23 AM EDTSpecial Weather StatementPHICecil37 min
Jul 14, 11:40 AM EDTFlash Flood WatchPHICecil, Kent, Queen Anne's11 hr
Jul 14, 12:06 PM EDTHeat AdvisoryPHICaroline, Kent, Queen Anne's, Talbot7 hr
Jul 14, 2:31 PM EDTSevere Thunderstorm WarningPHICecil59 min
Jul 14, 2:46 PM EDTAreal Flood AdvisoryPHICecil3 hr
Jul 14, 3:10 PM EDTFlash Flood WarningPHICecil2 hr
Jul 14, 3:18 PM EDTSevere Thunderstorm WarningPHICecil12 min
Jul 14, 3:23 PM EDTSevere Thunderstorm WarningPHICecil67 min
Jul 14, 3:52 PM EDTFlash Flood WarningPHITalbot53 min
Jul 14, 3:57 PM EDTFlash Flood WarningPHICecil, Kent2 hr
Jul 14, 4:00 PM EDTSpecial Weather StatementPHICaroline45 min
Jul 14, 4:05 PM EDTSpecial Weather StatementPHIKent40 min
Jul 14, 4:48 PM EDTSpecial Weather StatementPHIQueen Anne's27 min
Jul 14, 4:59 PM EDTFlash Flood WarningPHIQueen Anne's4 hr
Jul 14, 5:27 PM EDTSpecial Weather StatementPHIQueen Anne's63 min
Jul 14, 5:40 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot65 min
Jul 14, 5:58 PM EDTFlash Flood WarningPHITalbot3 hr
Jul 14, 6:10 PM EDTFlash Flood WarningPHICaroline3 hr
Jul 14, 6:20 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot40 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2017Every severe thunderstorm warning in 2017

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.