Alert archive / Maryland / Tornado Warnings in 2021

Tornado Warning 9, NWS Baltimore/Washington

May 3, 2021Baltimore County, Maryland

NWS Baltimore/Washington issued this tornado warning at May 3, 2021, 9:22 PM EDT for Baltimore County, Maryland. It was in force for 24 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: May 3, 2021, 9:22 PM EDT (01:22 UTC)
Expired: May 3, 2021, 9:46 PM EDT
In force: 24 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Baltimore County, MD

The radar

The Sterling radar (KLWX), 90 km from the middle of the area, began a volume at 01:24 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, 9:24 PM EDT	TSTM WND DMG	3 Nnw Glyndon, MD	TREE DOWN ON SOUTHBOUND ROUTE 30 JUST NORTH OF MT. GILEAD ROAD.

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, 1.4 hours before the alert went out and 87 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.

471 
WFUS51 KLWX 040122
TORLWX
MDC005-040200-
/O.NEW.KLWX.TO.W.0009.210504T0122Z-210504T0200Z/

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

The National Weather Service in Sterling Virginia has issued a

* Tornado Warning for...
  Northwestern Baltimore County in northern Maryland...

* Until 1000 PM EDT.
    
* At 922 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Hampstead, or 7 miles east of Westminster, moving
  east at 15 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation. This storm has a history of 
           producing damage in Frederick County.

  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...
  Upperco, Boring, Butler, Hereford and Parkton. 

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3951 7667 3951 7686 3955 7685 3960 7683
      3964 7666
TIME...MOT...LOC 0122Z 260DEG 15KT 3954 7687 

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

$$

ADS

2 follow-up statements

805 
WWUS51 KLWX 040138
SVSLWX

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

MDC005-040200-
/O.CON.KLWX.TO.W.0009.000000T0000Z-210504T0200Z/
Baltimore MD-
938 PM EDT Mon May 3 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT FOR
NORTHWESTERN BALTIMORE COUNTY...
    
At 938 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Hampstead, or 8 miles northwest of Cockeysville,
moving east 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...
Butler, Hereford and Parkton. 

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3951 7667 3951 7681 3955 7681 3961 7678
      3964 7666
TIME...MOT...LOC 0138Z 260DEG 16KT 3955 7676 

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

$$

ADS

146 
WWUS51 KLWX 040146
SVSLWX

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

MDC005-040156-
/O.CAN.KLWX.TO.W.0009.000000T0000Z-210504T0200Z/
Baltimore MD-
946 PM EDT Mon May 3 2021

...THE TORNADO WARNING FOR NORTHWESTERN BALTIMORE COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

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

LAT...LON 3951 7667 3951 7681 3955 7681 3961 7678
      3964 7666
TIME...MOT...LOC 0144Z 260DEG 15KT 3956 7672 

$$

ADS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 8:11 PM EDT	Tornado Warning	LWX	Frederick	34 min
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 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.