Alert archive / Maryland / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 23, NWS Philadelphia/Mount Holly

April 28, 2008Kent County, Delaware; Caroline County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 28, 2008, 4:19 PM EDT for Kent County, Delaware; Caroline County, Queen Anne's County, Maryland. It was in force for 56 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: Apr 28, 2008, 4:19 PM EDT (20:19 UTC)
Expired: Apr 28, 2008, 5:15 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, Caroline County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 38 km from the middle of the area, began a volume at 20:21 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
Apr 28, 4:38 PM EDT	TSTM WND DMG	Marydel, MD	WIRES AND SOME TREES DOWN.

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, 8.3 hours before the alert went out and 63 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: 4 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 412 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 293 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 282018
SVRPHI
DEC001-MDC011-035-282115-
/O.NEW.KPHI.SV.W.0023.080428T2019Z-080428T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
419 PM EDT MON APR 28 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE...
  THIS INCLUDES THE CITY OF DOVER...
  NORTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
  EAST CENTRAL QUEEN ANNES COUNTY IN NORTHEAST MARYLAND...

* UNTIL 515 PM EDT

* AT 416 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES NORTHWEST OF RIDGELY...
  OR ABOUT 25 MILES WEST OF DOVER...AND MOVING EAST AT 41 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  7 MILES NORTH OF GREENSBORO BY 425 PM EDT...
  GOLDSBORO BY 430 PM EDT...
  HARTLY BY 440 PM EDT...
  6 MILES NORTH OF WOODSIDE AND 8 MILES NORTH OF VIOLA BY 445 PM
  EDT...
  DOVER...CAMDEN...CHESWOLD AND RISING SUN BY 450 PM EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK 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.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

LAT...LON 3933 7544 3928 7542 3927 7540 3921 7538
      3917 7540 3913 7540 3911 7539 3908 7539
      3902 7533 3886 7589 3916 7593
TIME...MOT...LOC 2019Z 249DEG 35KT 3906 7592

$$
 
TFG

1 follow-up statement

000 
WWUS51 KPHI 282050
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
448 PM EDT MON APR 28 2008

MDC011-035-282058-
/O.CAN.KPHI.SV.W.0023.000000T0000Z-080428T2115Z/
CAROLINE MD-QUEEN ANNES MD-
448 PM EDT MON APR 28 2008

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL QUEEN ANNES AND
NORTHERN CAROLINE COUNTIES IS CANCELLED...

THE LINE OF SEVERE STORMS HAS MOVED EAST OF THE AREA.

LAT...LON 3926 7565 3927 7559 3933 7544 3928 7542
      3927 7540 3921 7538 3917 7540 3908 7539
      3902 7533 3892 7569
TIME...MOT...LOC 2048Z 243DEG 24KT 3916 7562

$$

DEC001-282115-
/O.CON.KPHI.SV.W.0023.000000T0000Z-080428T2115Z/
KENT DE-
448 PM EDT MON APR 28 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR KENT COUNTY...

AT 446 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR WYOMING...OR 6 MILES 
WEST OF DOVER...MOVING NORTHEAST AT 28 MPH. THERE WERE OTHER
POTENTIALLY SEVERE STORMS ALONG THE LINE INTO MISPILLION HUNDRED.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHESWOLD...RODNEY VILLAGE...KENT ACRES AND CAMDEN BY 455 PM EDT...
  DOVER AND 6 MILES NORTHWEST OF DOVER BASE HOUSING BY 500 PM EDT...
  LEIPSIC AND LITTLE CREEK BY 505 PM EDT...

DOPPLER RADAR HAS INDICATED A COUPLE OF WEAK ROTATIONS WITHIN THIS 
LINE. IN ADDITION A STRONGER ROTATION WAS NOTED JUST SOUTHEAST OF 
HARTLY WHERE A TORNADO WARNING IS IN EFFECT.

ELSEWHERE 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.

LAT...LON 3926 7565 3927 7559 3933 7544 3928 7542
      3927 7540 3921 7538 3917 7540 3908 7539
      3902 7533 3892 7569
TIME...MOT...LOC 2048Z 243DEG 24KT 3916 7562

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 3:58 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	62 min
Apr 28, 4:37 PM EDT	Tornado Warning	PHI	Kent	23 min
Apr 28, 5:22 PM EDT	Areal Flood Advisory	PHI	New Castle	113 min
Apr 28, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	65 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2008 Severe Thunderstorm Warnings in Delaware, 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.