Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 2, NWS Philadelphia/Mount Holly

February 7, 20204 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 7, 2020, 8:49 AM EST for 4 counties in Maryland. It was in force for 56 min. 4 reports 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: Feb 7, 2020, 8:49 AM EST (13:49 UTC)
Expired: Feb 7, 2020, 9:45 AM EST
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The Dover AFB radar (KDOX), 65 km from the middle of the area, began a volume at 13:51 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
Feb 7, 9:24 AM EST	TSTM WND DMG	Rock Hall, MD	REPORTS OF DOWNED TREES IN THE AREA OF ROCK HALL ROAD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:30 AM EST	TSTM WND DMG	1 Nnw Denton, MD	SIGNIFICANT STRUCTURAL DAMAGE TO A BARN. TIME ESTIMATED FROM RADAR.
Feb 7, 9:30 AM EST	TSTM WND DMG	1 Ssw Ridgely, MD	DOWNED UTILITY ON STATE HIGHWAY 480 AT SUNSET BOULEVARD. TIME ESTIMATED FROM RADAR.
Feb 7, 9:35 AM EST	TSTM WND DMG	1 Ssw Agner, MD	STRAIGHT LINE WINDS COLLAPSED A BLOCK BARN ON HOWARD ROAD NORTH OF FEDERALSBURG. A SWATH OF DAMAGE TO MULTIPLE OTHER NEARBY STRUCTURES CONSISTENT WITH WINDS OF 70-80 MPH ALSO OCCURRED. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 1.8 hours before the alert went out and 106 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: 22 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 491 m above ground
0-6 km bulk shear: 134 kt
0-1 km storm-relative helicity: 488 m²/s²
0-3 km storm-relative helicity: 531 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

337 
WUUS51 KPHI 071349
SVRPHI
MDC011-029-035-041-071445-
/O.NEW.KPHI.SV.W.0002.200207T1349Z-200207T1445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
849 AM EST Fri Feb 7 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Talbot County in eastern Maryland...
  Queen Anne's County in northeastern Maryland...
  Caroline County in eastern Maryland...
  Kent County in northeastern Maryland...

* Until 945 AM EST.

* At 848 AM EST, severe thunderstorms were located along a line
  extending from Odenton to near Upper Marlboro to near Waldorf, 
  moving northeast at 50 mph. This line of storms has a history of 
  producing wind damage.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Easton, Centerville, Talbot, Chestertown, Denton, Centreville,
  Romancoke, Federalsburg, Greensboro, Oakland, Ridgely, Rock Hall,
  Trappe, St. Michaels, Church Hill, Preston, Oxford, Millington,
  Sudlersville and Goldsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 3886 7626 3879 7620 3897 7625 3884 7637
      3892 7637 3904 7631 3900 7617 3915 7628
      3932 7618 3938 7577 3864 7571 3870 7590
      3857 7604 3876 7630 3867 7634 3876 7638
TIME...MOT...LOC 1348Z 244DEG 44KT 3906 7668 3887 7671 3859 7683 

HAIL...0.75IN
WIND...70MPH
 
$$

Staarmann

1 follow-up statement

330 
WWUS51 KPHI 071442
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
942 AM EST Fri Feb 7 2020

MDC011-029-035-041-071451-
/O.EXP.KPHI.SV.W.0002.000000T0000Z-200207T1445Z/
Talbot MD-Queen Anne's MD-Caroline MD-Kent MD-
942 AM EST Fri Feb 7 2020

...THE SEVERE THUNDERSTORM WARNING FOR TALBOT...QUEEN ANNE'S...
CAROLINE AND KENT COUNTIES WILL EXPIRE AT 945 AM EST...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning will be allowed to expire, however 
gusty winds will still persist for a time after the storms pass.

LAT...LON 3886 7626 3879 7620 3897 7625 3884 7637
      3892 7637 3904 7631 3900 7617 3915 7628
      3932 7618 3938 7577 3864 7571 3870 7590
      3857 7604 3876 7630 3867 7634 3876 7638
TIME...MOT...LOC 1441Z 244DEG 44KT 3933 7596 3914 7599 3886 7611 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 7, 8:03 AM EST	Coastal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	11 hr
Feb 7, 8:52 AM EST	Severe Thunderstorm Warning	PHI	Cecil, Kent	53 min
Feb 7, 9:24 AM EST	Severe Thunderstorm Warning	PHI	Caroline	66 min
Feb 7, 9:36 AM EST	Severe Thunderstorm Warning	PHI	Cecil, Kent	39 min
Feb 7, 9:39 AM EST	Tornado Warning	PHI	Cecil	36 min
Feb 7, 2:13 PM EST	Coastal Flood Advisory	PHI	Kent	7 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2020 Every severe thunderstorm warning in 2020

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.