Alert archive / Maryland / Tornado Warnings in 2021

Tornado Warning 20, NWS Baltimore/Washington

July 29, 2021Carroll County, Maryland

NWS Baltimore/Washington issued this tornado warning at Jul 29, 2021, 4:01 PM EDT for Carroll County, Maryland. It was in force for 29 min. 3 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: Jul 29, 2021, 4:01 PM EDT (20:01 UTC)
Expired: Jul 29, 2021, 4:30 PM EDT
In force: 29 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Carroll County, MD

The radar

The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 20:00 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
Jul 29, 4:10 PM EDT	TSTM WND DMG	1 E Wagners Mill, MD	TREE REPORTED DOWN ON AVALON LANE NEAR LONG VALLEY ROAD.
Jul 29, 4:10 PM EDT	TSTM WND DMG	1 Nne Westminster, MD	TREE REPORTED DOWN ON KRIDERS CHURCH ROAD NEAR KRIDERS CEMETARY ROAD.
Jul 29, 4:20 PM EDT	TSTM WND DMG	1 Wsw Reese, MD	TREE REPORTED DOWN ON ARNOLD ROAD NEAR POOLE ROAD.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 29, 2:23 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.0 hours before the alert went out and 78 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: 269 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 893 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

268 
WFUS51 KLWX 292001
TORLWX
MDC013-292030-
/O.NEW.KLWX.TO.W.0020.210729T2001Z-210729T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Baltimore MD/Washington DC
401 PM EDT Thu Jul 29 2021

The National Weather Service in Sterling Virginia has issued a

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

* Until 430 PM EDT.
    
* At 401 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Westminster, moving east at 25 mph.

  HAZARD...Tornado and quarter size hail.

  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.

* This dangerous storm will be near...
  Westminster around 410 PM EDT.
  Hampstead around 425 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Wagners Mill, Finksburg, Carrollton, Patapsco, Reese and Uniontown.

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 3959 7684 3952 7686 3948 7687 3948 7688
      3946 7689 3960 7715 3964 7711
TIME...MOT...LOC 2001Z 288DEG 20KT 3960 7707 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

DHOF

3 follow-up statements

841 
WWUS51 KLWX 292009
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
409 PM EDT Thu Jul 29 2021

MDC013-292030-
/O.CON.KLWX.TO.W.0020.000000T0000Z-210729T2030Z/
Carroll MD-
409 PM EDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR EAST
CENTRAL CARROLL COUNTY...
    
At 408 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Westminster, moving east at 25 mph.

HAZARD...Tornado and quarter size hail.

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.

This tornadic thunderstorm will remain over mainly rural areas of
east central Carroll County, including the following locations...
Wagners Mill, Finksburg, Carrollton, Patapsco and Reese.

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 3959 7684 3952 7686 3948 7687 3948 7688
      3946 7689 3956 7708 3960 7702
TIME...MOT...LOC 2008Z 290DEG 20KT 3956 7702 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

DHOF

985 
WWUS51 KLWX 292019
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
419 PM EDT Thu Jul 29 2021

MDC013-292030-
/O.CON.KLWX.TO.W.0020.000000T0000Z-210729T2030Z/
Carroll MD-
419 PM EDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR EAST
CENTRAL CARROLL COUNTY...
    
At 419 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Westminster, moving east at 25 mph.

HAZARD...Tornado and quarter size hail.

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...
Westminster, Finksburg, Carrollton, Patapsco and Reese. 

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 3952 7686 3948 7687 3948 7688 3946 7689
      3953 7700 3958 7696 3957 7685
TIME...MOT...LOC 2019Z 288DEG 20KT 3954 7694 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

DHOF

791 
WWUS51 KLWX 292029
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
429 PM EDT Thu Jul 29 2021

MDC013-292039-
/O.EXP.KLWX.TO.W.0020.000000T0000Z-210729T2030Z/
Carroll MD-
429 PM EDT Thu Jul 29 2021

...THE TORNADO WARNING FOR EAST CENTRAL CARROLL COUNTY WILL EXPIRE AT
430 PM EDT...
        
The storm which prompted the warning has moved out of the area and 
the rotation has weakened. Therefore, the warning will be allowed to 
expire.

A Tornado Watch remains in effect until 900 PM EDT for northern and
north central Maryland.

LAT...LON 3952 7686 3948 7687 3948 7688 3946 7689
      3953 7700 3958 7696 3957 7685
TIME...MOT...LOC 2029Z 288DEG 20KT 3953 7689 

$$

DHOF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 9:30 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	45 min
Jul 28, 9:48 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery, Prince George's	42 min
Jul 29, 3:31 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick	44 min
Jul 29, 4:00 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll	45 min
Jul 29, 4:16 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Howard	44 min
Jul 29, 4:34 PM EDT	Tornado Warning	LWX	Howard	26 min
Jul 29, 4:40 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery, Prince George's	50 min
Jul 29, 4:50 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Howard, City of Baltimore	55 min
Jul 29, 4:59 PM EDT	Severe Thunderstorm Warning	LWX	Charles	46 min
Jul 29, 4:59 PM EDT	Tornado Warning	LWX	Anne Arundel, Baltimore, Howard	31 min
Jul 29, 5:01 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery, Prince George's	29 min
Jul 29, 5:30 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	40 min
Jul 29, 5:43 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel	17 min
Jul 29, 6:49 PM EDT	Coastal Flood Advisory	LWX	Anne Arundel	4 hr

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.