Alert archive / Maryland / Tornado Warnings in 2021
Tornado Warning 21, NWS Baltimore/Washington
NWS Baltimore/Washington issued this tornado warning at Jul 29, 2021, 4:34 PM EDT for Howard County, Maryland. It was in force for 26 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, 4:34 PM EDT (20:34 UTC)
- Expired
- Jul 29, 2021, 5:00 PM EDT
- In force
- 26 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
County Howard County, MD
The radar
The Sterling radar (KLWX), 64 km from the middle of the area, began a volume at 20:33 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, 4:35 PM EDT | TSTM WND DMG | 1 Se Gaither, MD | TREE DAMAGE WAS REPORTED NEAR GAITHER, INCLUDING NEAR THE INTERSECTION OF GAITHER ROAD AND FORSYTHE ROAD. |
| Jul 29, 4:52 PM EDT | TSTM WND DMG | 3 Wnw Historic Ellicott, MD | TREES BLEW DOWN ON WESTBOUND US-40 BALTIMORE NATIONAL PIKE AT BETHANY LANE. |
| Jul 29, 5:00 PM EDT | TSTM WND DMG | 2 Nne Historic Ellicott, MD | SEVERAL TREES BLEW DOWN IN PATAPSCO VALLEY STATE PARK. |
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, 8.6 hours before the alert went out and 60 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.
- 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
The text
As transmitted.
055
WFUS51 KLWX 292034
TORLWX
MDC027-292100-
/O.NEW.KLWX.TO.W.0021.210729T2034Z-210729T2100Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Baltimore MD/Washington DC
434 PM EDT Thu Jul 29 2021
The National Weather Service in Sterling Virginia has issued a
* Tornado Warning for...
Northeastern Howard County in central Maryland...
* Until 500 PM EDT.
* At 434 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Sykesville, or 11 miles northeast of Damascus,
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...
Ellicott City around 455 PM EDT.
Columbia, Historic Ellicott City, Catonsville and Woodlawn around
500 PM EDT.
Other locations impacted by this tornadic thunderstorm include West
Friendship, Daniels and Woodstock.
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 3934 7688 3932 7685 3932 7680 3930 7678
3927 7679 3926 7679 3921 7682 3933 7706
3935 7703 3936 7700
TIME...MOT...LOC 2034Z 287DEG 20KT 3934 7701
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
DHOF1 follow-up statement
375
WWUS51 KLWX 292046
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
446 PM EDT Thu Jul 29 2021
MDC027-292100-
/O.CON.KLWX.TO.W.0021.000000T0000Z-210729T2100Z/
Howard MD-
446 PM EDT Thu Jul 29 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR
NORTHEASTERN HOWARD COUNTY...
At 446 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Sykesville, or 7 miles northwest of Historic
Ellicott City, moving east at 25 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...For those in the direct path of a tornado touchdown, flying
debris will be dangerous to those caught without shelter.
Damage to roofs, siding, and windows may occur. Mobile
homes may be damaged or destroyed. Tree damage is likely.
This dangerous storm will be near...
Ellicott City around 455 PM EDT.
Historic Ellicott City around 500 PM EDT.
Columbia and Catonsville around 505 PM EDT.
Woodlawn around 515 PM EDT.
Other locations impacted by this tornadic thunderstorm include West
Friendship and Daniels.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 3932 7685 3932 7680 3930 7678 3927 7679
3926 7679 3921 7682 3929 7698 3934 7694
TIME...MOT...LOC 2046Z 287DEG 20KT 3932 7693
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
DHOFThe 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, 4:01 PM EDT | Tornado Warning | LWX | Carroll | 29 min |
| Jul 29, 4:16 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Howard | 44 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, 2021Every tornado warning in 2021Tornadoes 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.