Alert archive / Maryland / Tornado Warnings in 2012
Tornado Warning 40, NWS Baltimore/Washington
NWS Baltimore/Washington issued this tornado warning at Sep 8, 2012, 3:53 PM EDT for Montgomery County, Prince George's County, Maryland. It was in force for 15 min. 2 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
- Sep 8, 2012, 3:53 PM EDT (19:53 UTC)
- Expired
- Sep 8, 2012, 4:08 PM EDT
- In force
- 15 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
The radar
The Sterling radar (KLWX), 52 km from the middle of the area, began a volume at 19:56 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 8, 4:05 PM EDT | TSTM WND GST 59 | 2 Ene Beltsville, MD | |
| Sep 8, 4:09 PM EDT | TSTM WND GST 58 | 2 W Glenn Dale, MD |
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 8, 12:15 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.9 hours before the alert went out and 45 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
- 252 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 638 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
141 WFUS51 KLWX 081953 TORLWX MDC031-033-082030- /O.NEW.KLWX.TO.W.0040.120908T1953Z-120908T2030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 353 PM EDT SAT SEP 8 2012 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * TORNADO WARNING FOR... SOUTHEASTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND... NORTHERN PRINCE GEORGES COUNTY IN CENTRAL MARYLAND... * UNTIL 430 PM EDT * AT 352 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO WAS NEAR WHITE OAK...OR NEAR LANGLEY PARK...AND WAS MOVING EAST AT 30 MPH. * LOCATIONS IMPACTED INCLUDE... BELTSVILLE... COLLEGE PARK... GREENBELT... 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. MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST RESORT...EITHER PARK AND STAY IN YOUR VEHICLE...OR ABANDON YOUR VEHICLE AND LAY FLAT IN A LOW SPOT. THIS TORNADO MAY BE WRAPPED IN RAIN AND HARD TO SEE. TAKE COVER NOW. && LAT...LON 3906 7681 3896 7684 3902 7702 3907 7700 TIME...MOT...LOC 1953Z 291DEG 26KT 3903 7697 $$ GMS
2 follow-up statements
323 WWUS51 KLWX 082001 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 401 PM EDT SAT SEP 8 2012 MDC031-082011- /O.CAN.KLWX.TO.W.0040.000000T0000Z-120908T2030Z/ MONTGOMERY MD- 401 PM EDT SAT SEP 8 2012 ...THE TORNADO WARNING IS CANCELLED FOR MONTGOMERY COUNTY... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED AREA. THUS THE TORNADO WARNING HAS BEEN CANCELLED. LAT...LON 3907 7693 3906 7681 3896 7684 3900 7695 TIME...MOT...LOC 2001Z 291DEG 26KT 3902 7688 $$ MDC033-082030- /O.CON.KLWX.TO.W.0040.000000T0000Z-120908T2030Z/ PRINCE GEORGES MD- 401 PM EDT SAT SEP 8 2012 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR PRINCE GEORGES COUNTY... AT 359 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO WAS LOCATED NEAR BELTSVILLE...AND WAS MOVING EAST AT 30 MPH. 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. MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST RESORT...EITHER PARK AND STAY IN YOUR VEHICLE...OR ABANDON YOUR VEHICLE AND LAY FLAT IN A LOW SPOT. 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 3907 7693 3906 7681 3896 7684 3900 7695 TIME...MOT...LOC 2001Z 291DEG 26KT 3902 7688 $$ GMS
398 WWUS51 KLWX 082008 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 408 PM EDT SAT SEP 8 2012 MDC033-082019- /O.CAN.KLWX.TO.W.0040.000000T0000Z-120908T2030Z/ PRINCE GEORGES MD- 408 PM EDT SAT SEP 8 2012 ...THE TORNADO WARNING IS CANCELLED FOR PRINCE GEORGES COUNTY... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED AREA. THUS THE TORNADO WARNING HAS BEEN CANCELLED. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR THE WARNED AREA. LAT...LON 3907 7693 3906 7681 3896 7684 3900 7695 TIME...MOT...LOC 2009Z 291DEG 26KT 3900 7681 $$ GMS
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 12:02 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 43 min |
| Sep 8, 12:22 PM EDT | Special Weather Statement | LWX | Washington | 23 min |
| Sep 8, 12:35 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 40 min |
| Sep 8, 12:47 PM EDT | Tornado Warning | LWX | Washington | 16 min |
| Sep 8, 1:09 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Washington | 66 min |
| Sep 8, 2:02 PM EDT | Special Weather Statement | LWX | Baltimore | 58 min |
| Sep 8, 2:10 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll, Frederick, Harford, Howard, Montgomery | 80 min |
| Sep 8, 2:47 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 58 min |
| Sep 8, 3:18 PM EDT | Special Weather Statement | LWX | Anne Arundel, Montgomery, Prince George's | 87 min |
| Sep 8, 3:22 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Charles, Howard, Montgomery, Prince George's | 68 min |
| Sep 8, 3:27 PM EDT | Special Weather Statement | LWX | Harford | 33 min |
| Sep 8, 3:58 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Calvert, Charles, Howard, Montgomery and 3 more | 55 min |
| Sep 8, 4:06 PM EDT | Tornado Warning | LWX | Anne Arundel, Prince George's | 39 min |
| Sep 8, 4:25 PM EDT | Special Weather Statement | LWX | Kent | 20 min |
Nearby
Tornado Warnings in Maryland, 2012Every tornado warning in 2012Tornadoes in 2012
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.