Alert archive / Maryland / Tornado Warnings in 2021

Tornado Warning 6, NWS Baltimore/Washington

May 3, 2021Frederick County, Maryland

NWS Baltimore/Washington issued this tornado warning at May 3, 2021, 8:11 PM EDT for Frederick County, Maryland. It was in force for 34 min. 5 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: May 3, 2021, 8:11 PM EDT (00:11 UTC)
Expired: May 3, 2021, 8:45 PM EDT
In force: 34 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Frederick County, MD

The radar

The Sterling radar (KLWX), 64 km from the middle of the area, began a volume at 00:13 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
May 3, 8:14 PM EDT	TORNADO	2 E Mount Pleasant, MD	EF-1. PEAK WIND 90 MPH. PATH LENGTH 0.8 MILES. PATH WIDTH 200 YARDS. 8:14PM - 8:16PM
May 3, 8:16 PM EDT	TSTM WND DMG	3 S Libertytown, MD	TREES AND WIRES DOWN NEAR OLD ANNAPOLIS ROAD AND CHESNUT GROVE ROAD.
May 3, 8:23 PM EDT	TSTM WND DMG	Libertytown, MD	TREES AND WIRES DOWN IN LIBERTYTOWN NEAR ROUTE 26 AND 75.
May 3, 8:23 PM EDT	TSTM WND DMG	Libertytown, MD	TREES DOWN NEAR MD-26 AND MD-550.
May 3, 8:35 PM EDT	TORNADO	3 Wsw Marston, MD	EF1 TORNADO. 0.7MI LATH LENGTH. 150 YARDS PATH WIDTH. PEAK WIND 90MPH.

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 00:00Z, 0.2 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: 528 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

452 
WFUS51 KLWX 040011
TORLWX
MDC021-040045-
/O.NEW.KLWX.TO.W.0006.210504T0011Z-210504T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Baltimore MD/Washington DC
811 PM EDT Mon May 3 2021

The National Weather Service in Sterling Virginia has issued a

* Tornado Warning for...
  East central Frederick County in north central Maryland...

* Until 845 PM EDT.
    
* At 811 PM EDT, a severe thunderstorm capable of producing a 
  tornado was located near Discovery-Spring Garden, or east of 
  Frederick, moving northeast at 20 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...For those in the direct path of a tornado touchdown, 
           flying debris will be dangerous to those caught without 
           shelter. Damage to roofs, siding, and windows may occur. 
           Mobile homes may be damaged or destroyed. Tree damage is 
           likely.

* Locations impacted include...
  Walkersville, Linganore-Bartonsville, Libertytown, Unionville and
  Mount Pleasant.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3953 7715 3952 7715 3952 7714 3951 7713
      3950 7711 3948 7712 3946 7712 3942 7715
      3942 7732 3948 7734 3954 7717
TIME...MOT...LOC 0011Z 246DEG 16KT 3945 7729 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

ADS

2 follow-up statements

765 
WWUS51 KLWX 040024
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
824 PM EDT Mon May 3 2021

MDC021-040045-
/O.CON.KLWX.TO.W.0006.000000T0000Z-210504T0045Z/
Frederick MD-
824 PM EDT Mon May 3 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR EAST
CENTRAL FREDERICK COUNTY IN NORTH CENTRAL MARYLAND...
    
At 824 PM EDT, a severe thunderstorm capable of producing a tornado
was located near New Market, or 10 miles east of Frederick, moving
northeast at 20 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...For those in the direct path of a tornado touchdown, flying 
         debris will be dangerous to those caught without shelter. 
         Damage to roofs, siding, and windows may occur. Mobile 
         homes may be damaged or destroyed. Tree damage is likely.

Locations impacted include...
Libertytown and Unionville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3953 7715 3952 7715 3952 7714 3951 7713
      3950 7711 3948 7712 3946 7712 3944 7715
      3942 7721 3950 7729 3954 7717
TIME...MOT...LOC 0024Z 246DEG 16KT 3947 7722 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

ADS

077 
WWUS51 KLWX 040045
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
845 PM EDT Mon May 3 2021

MDC021-040055-
/O.EXP.KLWX.TO.W.0006.000000T0000Z-210504T0045Z/
Frederick MD-
845 PM EDT Mon May 3 2021

...THE TORNADO WARNING FOR EAST CENTRAL FREDERICK COUNTY IN NORTH
CENTRAL MARYLAND HAS EXPIRED...
        
The storm which prompted the warning has moved into Carroll County.
Therefore, the warning has been allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sterling Virginia.

LAT...LON 3953 7715 3952 7715 3952 7714 3951 7713
      3950 7711 3948 7712 3946 7712 3944 7715
      3942 7721 3950 7729 3954 7717
TIME...MOT...LOC 0045Z 246DEG 16KT 3951 7711 

$$

ADS

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 8:31 PM EDT	Tornado Warning	LWX	Carroll	29 min
May 3, 8:47 PM EDT	Areal Flood Warning	LWX	Frederick	3 hr
May 3, 8:49 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick	26 min
May 3, 8:56 PM EDT	Tornado Warning	LWX	Carroll	34 min
May 3, 9:22 PM EDT	Tornado Warning	LWX	Baltimore	24 min
May 4, 12:12 PM EDT	Severe Thunderstorm Warning	LWX	Garrett	48 min
May 4, 4:55 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Montgomery, Prince George's	50 min
May 4, 5:27 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's	33 min
May 4, 5:49 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Charles, Saint Mary's	56 min

Nearby

Tornado Warnings in Maryland, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.