Alert archive / Alabama / Tornado Warnings in 2011
Tornado Warning 44, NWS Birmingham, AL
NWS Birmingham, AL issued this tornado warning at Apr 11, 2011, 7:34 PM CDT for Jefferson County, St. Clair County, Shelby County, Alabama. It was in force for 19 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
- Apr 11, 2011, 7:34 PM CDT (00:34 UTC)
- Expired
- Apr 11, 2011, 7:53 PM CDT
- In force
- 19 min
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
Counties Jefferson County, AL, Shelby County, AL, St. Clair County, AL
The radar
The Birmingham radar (KBMX), 47 km from the middle of the area, began a volume at 00:34 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 |
|---|---|---|---|
| Apr 11, 7:34 PM CDT | TSTM WND DMG | Cahaba Heights, AL | TREE DOWN ON HOUSE ON MEADOW LAWN NEAR DOLLY RIDGE. |
| Apr 11, 7:40 PM CDT | TSTM WND DMG | 6 Se Mountain Brook, AL | TREE DOWN ON A VEHICLE ON BROOK HIGHLAND LANE. NO INJURIES REPORTED. |
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 |
|---|---|---|---|
| Apr 11, 4:05 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 11, 7:08 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 0.6 hours before the alert went out and 47 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
- 557 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1487 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 271 m²/s²
- 0-3 km storm-relative helicity
- 323 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 9.2
The text
As transmitted, in the capitals the NWS used until 2016.
413 WFUS54 KBMX 120034 RRA TORBMX ALC073-115-117-120100- /O.NEW.KBMX.TO.W.0044.110412T0034Z-110412T0100Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE BIRMINGHAM AL 734 PM CDT MON APR 11 2011 THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL JEFFERSON COUNTY IN CENTRAL ALABAMA... SOUTHWESTERN ST. CLAIR COUNTY IN CENTRAL ALABAMA... NORTHEASTERN SHELBY COUNTY IN CENTRAL ALABAMA... * UNTIL 800 PM CDT * AT 730 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR SAMFORD UNIVERSITY...OR NEAR HOMEWOOD...AND MOVING EAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... MOUNTAIN BROOK...IRONDALE...LEEDS...TRUSSVILLE...MOODY...CAHABA HEIGHTS...BIRMINGHAM AIRPORT...LAKE PURDY...GREYSTONE AND ALTON. THIS INCLUDES... INTERSTATE 65 EXIT NUMBERS 252 THROUGH 262... INTERSTATE 459 EXIT NUMBERS 17 THROUGH 33... INTERSTATE 20 EXIT NUMBERS 125 THROUGH 147... INTERSTATE 59 EXIT NUMBERS 130 THROUGH 137... PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. THIS LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING TORNADOES AND WIDESPREAD SIGNIFICANT WIND DAMAGE. DO NOT WAIT TO SEE OR HEAR THE TORNADO. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. && TO REPORT SEVERE WEATHER... CALL 1-800-856-0758. LAT...LON 3372 8642 3343 8636 3340 8681 3353 8684 TIME...MOT...LOC 0034Z 254DEG 36KT 3347 8675 $$ 56
2 follow-up statements
700 WWUS54 KBMX 120043 SVSBMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 743 PM CDT MON APR 11 2011 ALC073-115-117-120100- /O.CON.KBMX.TO.W.0044.000000T0000Z-110412T0100Z/ SHELBY AL-JEFFERSON AL-ST. CLAIR AL- 743 PM CDT MON APR 11 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHWESTERN ST. CLAIR... EAST CENTRAL JEFFERSON AND NORTHEASTERN SHELBY COUNTIES UNTIL 800 PM CDT... AT 738 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR CAHABA HEIGHTS...OR NEAR MOUNTAIN BROOK... MOVING EAST AT 40 MPH. LOCATIONS IMPACTED INCLUDE... LEEDS...TRUSSVILLE...MOODY...ALTON...BARBER MOTORSPORTS PARK... VANDIVER...BALD ROCK...BRANCHVILLE...MARGARET AND STERRETT. THIS INCLUDES... INTERSTATE 459 EXIT NUMBERS 23 THROUGH 33... INTERSTATE 20 EXIT NUMBERS 132 THROUGH 152... INTERSTATE 59 EXIT NUMBERS 132 THROUGH 137... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING TORNADOES AND WIDESPREAD SIGNIFICANT WIND DAMAGE. DO NOT WAIT TO SEE OR HEAR THE TORNADO. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. && TO REPORT SEVERE WEATHER...CALL 1-800-856-0758. LAT...LON 3342 8672 3358 8674 3372 8642 3343 8636 TIME...MOT...LOC 0043Z 254DEG 36KT 3349 8664 $$ 56
044 WWUS54 KBMX 120053 SVSBMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 753 PM CDT MON APR 11 2011 ALC073-115-117-120103- /O.CAN.KBMX.TO.W.0044.000000T0000Z-110412T0100Z/ SHELBY AL-JEFFERSON AL-ST. CLAIR AL- 753 PM CDT MON APR 11 2011 ...THE TORNADO WARNING FOR SOUTHWESTERN ST. CLAIR...EAST CENTRAL JEFFERSON AND NORTHEASTERN SHELBY COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845PM. TO REPORT SEVERE WEATHER...CALL 1-800-856-0758. LAT...LON 3342 8672 3358 8674 3372 8642 3343 8636 TIME...MOT...LOC 0053Z 254DEG 36KT 3351 8652 $$ 56
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 7:19 PM CDT | Tornado Warning | BMX | Jefferson, Shelby | 21 min |
| Apr 11, 7:28 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Calhoun, Etowah, Jefferson, St. Clair, Talladega | 62 min |
| Apr 11, 7:30 PM CDT | Severe Thunderstorm Warning | BMX | Dallas, Hale, Marengo, Perry | 60 min |
| Apr 11, 7:34 PM CDT | Tornado Warning | BMX | Marengo | 26 min |
| Apr 11, 7:41 PM CDT | Severe Thunderstorm Warning | BMX | Autauga, Bibb, Chilton, Clay, Coosa, Dallas and 4 more | 64 min |
| Apr 11, 8:03 PM CDT | Severe Thunderstorm Warning | BMX | Calhoun, Cherokee, Clay, Cleburne, Etowah, Randolph and 2 more | 57 min |
| Apr 11, 8:20 PM CDT | Severe Thunderstorm Warning | BMX | Autauga, Dallas, Lowndes | 40 min |
| Apr 11, 8:39 PM CDT | Severe Thunderstorm Warning | BMX | Autauga, Chambers, Clay, Coosa, Elmore, Montgomery and 3 more | 66 min |
| Apr 11, 8:52 PM CDT | Severe Thunderstorm Warning | BMX | Calhoun, Cherokee, Clay, Cleburne, Randolph | 38 min |
| Apr 11, 8:53 PM CDT | Severe Thunderstorm Warning | BMX | Autauga, Dallas, Lowndes, Montgomery, Pike | 67 min |
| Apr 11, 8:57 PM CDT | Tornado Warning | BMX | Cleburne | 33 min |
| Apr 11, 9:26 PM CDT | Severe Thunderstorm Warning | BMX | Chambers, Clay, Elmore, Lee, Macon, Montgomery and 2 more | 49 min |
| Apr 11, 10:01 PM CDT | Severe Thunderstorm Warning | BMX | Bullock, Lee, Macon, Montgomery, Russell | 44 min |
Nearby
Tornado Warnings in Alabama, 2011Every tornado warning in 2011Tornadoes in 2011
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.