Alert archive / Maryland / Tornado Warnings in 2010
Tornado Warning 21, NWS Baltimore/Washington
NWS Baltimore/Washington issued this tornado warning at Sep 30, 2010, 6:17 AM EDT for Calvert County, Saint Mary's County, Maryland. It was in force for 28 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
- Sep 30, 2010, 6:17 AM EDT (10:17 UTC)
- Expired
- Sep 30, 2010, 6:45 AM EDT
- In force
- 28 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Calvert County, MD, Saint Mary's County, MD
The radar
The Dover AFB radar (KDOX), 102 km from the middle of the area, began a volume at 10:18 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 |
|---|---|---|---|
| Sep 30, 6:17 AM EDT | TSTM WND DMG | Park Pines, MD | NUMEROUS TREES DOWN ALONG ROUTE 235. |
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 |
|---|---|---|---|
| Sep 30, 4:55 AM EDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 10.3 hours before the alert went out and 100 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
- 52 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 559 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
306
WFUS51 KLWX 301017
TORLWX
MDC009-037-301100-
/O.NEW.KLWX.TO.W.0021.100930T1017Z-100930T1100Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
617 AM EDT THU SEP 30 2010
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN CALVERT COUNTY IN SOUTHERN MARYLAND...
EASTERN ST. MARYS COUNTY IN SOUTHERN MARYLAND...
* UNTIL 700 AM EDT
* AT 616 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR SAINT MARYS
CITY...MOVING NORTH AT 40 MPH.
* LOCATIONS IMPACTED INCLUDE...
PATUXENT RIVER NAS...
CALIFORNIA...
CUCKOLD CREEK...
TOWN CREEK...
LUSBY...
SAINT LEONARD CREEK...
GREENWELL STATE PARK...
CALVERT CLIFFS...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
THE TORNADO MAY BE WRAPPED IN RAIN AND HARD TO SEE. DO NOT WAIT TO
SEE OR HEAR THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3817 7638 3818 7648 3840 7660 3853 7654
3855 7651 3848 7648 3839 7637 3836 7638
3833 7640 3830 7636 3827 7638 3825 7638
3820 7635
TIME...MOT...LOC 1017Z 174DEG 36KT 3822 7642
$$
GMS3 follow-up statements
642
WWUS51 KLWX 301024
SVSLWX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
624 AM EDT THU SEP 30 2010
MDC009-037-301100-
/O.CON.KLWX.TO.W.0021.000000T0000Z-100930T1100Z/
CALVERT MD-ST. MARYS MD-
624 AM EDT THU SEP 30 2010
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 AM EDT FOR EAST
CENTRAL ST. MARYS AND SOUTHEASTERN CALVERT COUNTIES...
AT 623 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
TORNADO WAS LOCATED NEAR PATUXENT RIVER NAS...OR NEAR LEXINGTON
PARK...MOVING NORTH AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
DRUM POINT...
DOWELL...
COVE POINT...
CUCKOLD CREEK...
LUSBY...
SAINT LEONARD CREEK...
GREENWELL STATE PARK...
CALVERT CLIFFS...
CALVERT BEACH...
LONG BEACH...
BROOMES ISLAND...
SAINT LEONARD...
PORT REPUBLIC...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
THIS TORNADO MAY BE WRAPPED IN RAIN AND HARD TO SEE. DO NOT WAIT TO
SEE OR HEAR THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3825 7638 3823 7640 3825 7646 3843 7659
3853 7654 3855 7651 3848 7648 3839 7637
3836 7638 3833 7640 3830 7636 3827 7638
TIME...MOT...LOC 1024Z 178DEG 35KT 3829 7642
$$
GMS446
WWUS51 KLWX 301034
SVSLWX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
634 AM EDT THU SEP 30 2010
MDC037-301044-
/O.CAN.KLWX.TO.W.0021.000000T0000Z-100930T1100Z/
ST. MARYS MD-
634 AM EDT THU SEP 30 2010
...THE TORNADO WARNING IS CANCELLED FOR EAST CENTRAL ST. MARYS
COUNTY...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED
AREA. THUS THE TORNADO WARNING HAS BEEN CANCELLED.
LAT...LON 3836 7638 3831 7642 3832 7644 3831 7646
3838 7649 3841 7652 3849 7656 3853 7654
3855 7651 3848 7648 3839 7637
TIME...MOT...LOC 1034Z 178DEG 35KT 3838 7642
$$
MDC009-301100-
/O.CON.KLWX.TO.W.0021.000000T0000Z-100930T1100Z/
CALVERT MD-
634 AM EDT THU SEP 30 2010
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 AM EDT FOR
SOUTHEASTERN CALVERT COUNTY...
AT 633 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
TORNADO WAS LOCATED NEAR LUSBY...OR NEAR CUCKOLD CREEK...MOVING NORTH
AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
CALVERT CLIFFS...
LUSBY...
CALVERT BEACH...
LONG BEACH...
SAINT LEONARD...
PORT REPUBLIC...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
THIS TORNADO MAY BE WRAPPED IN RAIN AND HARD TO SEE. DO NOT WAIT TO
SEE OR HEAR THE TORNADO. TAKE COVER NOW.
&&
LAT...LON 3836 7638 3831 7642 3832 7644 3831 7646
3838 7649 3841 7652 3849 7656 3853 7654
3855 7651 3848 7648 3839 7637
TIME...MOT...LOC 1034Z 178DEG 35KT 3838 7642
$$
GMS250
WWUS51 KLWX 301045
SVSLWX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
645 AM EDT THU SEP 30 2010
MDC009-301055-
/O.CAN.KLWX.TO.W.0021.000000T0000Z-100930T1100Z/
CALVERT MD-
645 AM EDT THU SEP 30 2010
...THE TORNADO WARNING IS CANCELLED FOR SOUTHEASTERN CALVERT
COUNTY...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED
AREA. THUS THE TORNADO WARNING HAS BEEN CANCELLED.
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA.
LAT...LON 3836 7638 3831 7642 3832 7644 3831 7646
3838 7649 3841 7652 3849 7656 3853 7654
3855 7651 3848 7648 3839 7637
TIME...MOT...LOC 1045Z 178DEG 35KT 3849 7642
$$
GMSThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 29, 8:48 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more | 25 hr |
| Sep 30, 3:57 AM EDT | Tornado Warning | LWX | Anne Arundel, Calvert, Saint Mary's | 33 min |
| Sep 30, 4:57 AM EDT | Flash Flood Warning | LWX | Anne Arundel, Calvert, Charles, Montgomery, Prince George's, Saint Mary's | 6 hr |
| Sep 30, 6:08 AM EDT | Special Weather Statement | LWX | Saint Mary's | 52 min |
| Sep 30, 6:39 AM EDT | Flash Flood Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 2 more | 6 hr |
| Sep 30, 7:32 AM EDT | Special Weather Statement | LWX | Saint Mary's | 43 min |
| Sep 30, 8:09 AM EDT | Coastal Flood Warning | LWX | Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more | 21 hr |
| Sep 30, 8:45 AM EDT | Severe Thunderstorm Warning | LWX | Harford | 45 min |
| Sep 30, 8:58 AM EDT | Tornado Warning | LWX | Calvert, Saint Mary's | 47 min |
| Sep 30, 9:28 AM EDT | Tornado Warning | LWX | Anne Arundel | 47 min |
| Sep 30, 9:49 AM EDT | Tornado Warning | LWX | Anne Arundel, Calvert | 26 min |
| Sep 30, 9:51 AM EDT | River Flood Warning | LWX | Montgomery | 24 hr |
| Sep 30, 10:29 AM EDT | Flash Flood Warning | LWX | Frederick, Washington | 4 hr |
| Sep 30, 10:38 AM EDT | Flash Flood Warning | LWX | Anne Arundel, Calvert, Charles, Howard, Montgomery, Prince George's and 1 more | 6 hr |
| Sep 30, 10:49 AM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery, Prince George's | 26 min |
| Sep 30, 11:12 AM EDT | River Flood Warning | LWX | Frederick | 5 hr |
| Sep 30, 11:12 AM EDT | River Flood Warning | LWX | Frederick | 18 hr |
| Sep 30, 11:12 AM EDT | River Flood Warning | LWX | Washington | 18 hr |
| Sep 30, 12:22 PM EDT | Flash Flood Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 2 more | 6 hr |
| Sep 30, 4:30 PM EDT | Flash Flood Warning | LWX | Anne Arundel, Calvert, Saint Mary's | 6 hr |
| Sep 30, 4:40 PM EDT | Flash Flood Warning | LWX | Carroll, Frederick, Howard, Montgomery, Washington | 11 hr |
| Sep 30, 6:13 PM EDT | Flash Flood Warning | LWX | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Harford and 5 more | 6 hr |
Nearby
Tornado Warnings in Maryland, 2010Every tornado warning in 2010Tornadoes in 2010
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.