Alert archive / Maryland / Special Weather Statements in 2016

Special Weather Statement, NWS Philadelphia/Mount Holly

August 21, 2016Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 21, 2016, 2:38 PM EDT for Cecil County, Maryland. It was in force for 22 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 21, 2016, 2:38 PM EDT (18:38 UTC)
Expired
Aug 21, 2016, 3:00 PM EDT
In force
22 min
Issued by
NWS Philadelphia/Mount Holly

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 93 km from the middle of the area, began a volume at 18:39 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, 6.6 hours before the alert went out and 133 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 2016-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 310 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 2016-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
310 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
719 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

358 
WWUS81 KPHI 211838
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
238 PM EDT SUN AUG 21 2016
 
MDZ008-012-PAZ101-102-211900-
CECIL-KENT-WESTERN CHESTER-EASTERN CHESTER-
238 PM EDT SUN AUG 21 2016

...A LINE OF SCATTERED STRONG THUNDERSTORMS WILL AFFECT NORTH CENTRAL
KENT...CECIL AND SOUTHWESTERN CHESTER COUNTIES...

AT 237 PM EDT...A LINE OF SCATTERED STRONG THUNDERSTORMS WAS ALONG A
LINE EXTENDING FROM NEAR ROCK SPRINGS TO NEAR HAVRE DE GRACE TO NEAR
BOWLEYS QUARTERS...AND MOVING EAST AT 35 MPH.

WIND GUSTS UP TO 30 MPH ARE POSSIBLE WITH THESE STORMS.

THESE STORMS WILL BE NEAR...  RISING
SUN...RICHARDSMERE...WOODLAWN...WEST NOTTINGHAM...CONOWINGO
AND   OCTORARO AROUND 240 PM EDT.   GLEN ROY AND FARMINGTON AROUND
245 PM EDT. 
  CALVERT...OXFORD...CHARLESTOWN...LOMBARD...BAY VIEW AND ZION AROUND 
  250 PM EDT. 
  NORTH EAST...BLAKE...PLEASANT HILL AND HOLLYWOOD BEACH AROUND 255 PM 
  EDT. 
  ELKTON...BETTERTON...KEMBLESVILLE...FAIR HILL...APPLETON...ANDORA...GLEN 
  WESTOVER...BRANTWOOD...CHERRY HILL AND BARKSDALE AROUND 300 PM EDT. 

OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE PORT DEPOSIT...
CHESAPEAKE CITY AND PERRYVILLE.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH A COUPLE OF
THESE STORMS. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A
THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3934 7614 3937 7611 3937 7606 3942 7600
      3946 7601 3952 7598 3955 7603 3955 7608
      3966 7617 3972 7615 3973 7610 3976 7608
      3982 7579 3956 7579 3932 7591 3933 7617
TIME...MOT...LOC 1837Z 265DEG 31KT 3973 7612 3958 7613 3934 7633 
$$

DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 1:36 PM EDTSmall Craft AdvisoryPHI26 hr
Aug 21, 3:47 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem118 min
Aug 21, 3:57 PM EDTSpecial Marine WarningPHI63 min
Aug 21, 5:19 PM EDTSpecial Marine WarningPHI41 min
Aug 21, 5:43 PM EDTSpecial Weather StatementPHICape May, Cumberland47 min
Aug 21, 5:49 PM EDTSpecial Marine WarningPHI26 min
Aug 21, 6:08 PM EDTSpecial Weather StatementPHICape May37 min
Aug 21, 6:12 PM EDTSpecial Marine WarningPHI33 min
Aug 21, 6:48 PM EDTSpecial Marine WarningPHI42 min
Aug 21, 6:59 PM EDTSpecial Weather StatementPHICape May16 min
Aug 21, 1:08 PM EDTSpecial Weather StatementPHILebanon22 min
Aug 21, 1:26 PM EDTSpecial Weather StatementPHIBerks64 min
Aug 21, 2:51 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery114 min
Aug 21, 2:57 PM EDTSpecial Weather StatementPHIKent, Queen Anne's33 min
Aug 21, 3:30 PM EDTAreal Flood AdvisoryPHICaroline, Cecil, Kent, Queen Anne's2 hr
Aug 21, 3:40 PM EDTSpecial Weather StatementPHITalbot50 min
Aug 21, 3:50 PM EDTSpecial Weather StatementPHIKent25 min
Aug 21, 4:06 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's39 min
Aug 21, 4:19 PM EDTSpecial Weather StatementPHITalbot26 min
Aug 21, 4:20 PM EDTFlash Flood WarningPHICecil, Kent, Queen Anne's4 hr
Aug 21, 4:29 PM EDTSpecial Weather StatementPHICaroline31 min
Aug 21, 4:50 PM EDTAreal Flood AdvisoryPHICaroline, Queen Anne's, Talbot3 hr
Aug 21, 4:54 PM EDTSpecial Weather StatementPHICaroline36 min
Aug 21, 5:06 PM EDTSevere Thunderstorm WarningPHICaroline39 min
Aug 21, 5:09 PM EDTFlash Flood WarningPHICaroline, Queen Anne's, Talbot4 hr
Aug 21, 6:35 PM EDTAreal Flood AdvisoryPHICaroline, Queen Anne's, Talbot3 hr
Aug 21, 5:28 PM EDTSpecial Weather StatementPHIKent17 min
Aug 21, 5:46 PM EDTSpecial Weather StatementPHISussex14 min
Aug 21, 5:54 PM EDTSpecial Weather StatementPHISussex36 min
Aug 21, 6:31 PM EDTSpecial Weather StatementPHISussex29 min
Aug 21, 7:04 PM EDTSpecial Weather StatementPHISussex26 min

Nearby

Special Weather Statements in Maryland, 2016Every special weather statement in 2016

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.