Alert archive / Alabama / Tornado Warnings in 2011
Tornado Warning 42, NWS Birmingham, AL
NWS Birmingham, AL issued this tornado warning at Apr 11, 2011, 7:19 PM CDT for Jefferson County, Shelby County, Alabama. It was in force for 21 min. 10 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, 7:19 PM CDT (00:19 UTC)
- Expired
- Apr 11, 2011, 7:40 PM CDT
- In force
- 21 min
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
Counties Jefferson County, AL, Shelby County, AL
The radar
The Birmingham radar (KBMX), 28 km from the middle of the area, began a volume at 00:21 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, 7:27 PM CDT | TSTM WND DMG | Hoover, AL | NUMEROUS TREES ON HOUSES, POWERLINES DOWN, AND TREES DOWN ACROSS BLUFF PARK AREA. MAJOR STRUCTURAL DAMAGE TO ONE HOUSE. |
| Apr 11, 7:27 PM CDT | TORNADO 1 | 5 S Birmingham, AL | PATH WAS .4 MILES IN LENGTH AND 100 YARD IN WIDTH. PEAK WINDS WERE ESTIMATED AT 100 MPH. AFFECTED THE VESTAVIA HILLS AREA. DAMAGE PATH WAS FROM THE VESTAVIA HILLS POLICE DEPARTMENT...ACROSS BIRD PARK...TO JUST NORTH OF THE VESTAVIA HILLS COUNTRY CLUB. NUMEROUS |
| Apr 11, 7:28 PM CDT | TSTM WND DMG | 2 Se Homewood, AL | TREE DOWN AT THE CORNER OF HAVILAND DR AND GEORGIA AVE. |
| Apr 11, 7:28 PM CDT | TSTM WND DMG | 3 Ssw Homewood, AL | TREES DOWN AND POWERLINE ACROSS HACKBERRY LANE. |
| Apr 11, 7:28 PM CDT | TSTM WND DMG | Vestavia Hills, AL | TREES AND POWERLINES DOWN ON SUNNYWOOD CIRCLE AT VESTRIDGE RD. TREE ON VEHICLE. |
| Apr 11, 7:30 PM CDT | TSTM WND DMG | 5 Ssw Birmingham, AL | TREE DOWN ON WEST VALLEY AVE IN HOMEWOOD. |
| Apr 11, 7:30 PM CDT | TSTM WND DMG | Vestavia Hills, AL | TREES AND POWERLINES DOWN NEAR HAYES CIRCLE. |
| Apr 11, 7:34 PM CDT | TSTM WND DMG | Cahaba Heights, AL | TREE DOWN ON HOUSE ON MEADOW LAWN NEAR DOLLY RIDGE. |
| Apr 11, 7:34 PM CDT | TSTM WND DMG | Pelham, AL | LARGE TREE BLOCKING CHANDAFERN DR. |
| 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 |
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 0.3 hours before the alert went out and 27 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.
123 WFUS54 KBMX 120019 TORBMX ALC073-117-120100- /O.NEW.KBMX.TO.W.0042.110412T0019Z-110412T0100Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE BIRMINGHAM AL 719 PM CDT MON APR 11 2011 THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A * TORNADO WARNING FOR... SOUTH CENTRAL JEFFERSON COUNTY IN CENTRAL ALABAMA... NORTHERN SHELBY COUNTY IN CENTRAL ALABAMA... * UNTIL 800 PM CDT * AT 717 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR BESSEMER...AND MOVING EAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... HOOVER...HOMEWOOD...VESTAVIA HILLS...PELHAM...CHELSEA...ROSS BRIDGE...BLUFF PARK...REGIONS PARK OR HOOVER MET...RIVERCHASE AND RIVERCHASE GALLERIA. THIS INCLUDES... INTERSTATE 65 EXIT NUMBERS 246 THROUGH 258... INTERSTATE 459 EXIT NUMBERS 6 THROUGH 23... INTERSTATE 20 EXIT NUMBERS 113 THROUGH 115... 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 3350 8645 3323 8648 3333 8698 3347 8696 TIME...MOT...LOC 0020Z 273DEG 35KT 3339 8692 $$ 14
1 follow-up statement
802 WWUS54 KBMX 120040 SVSBMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 740 PM CDT MON APR 11 2011 ALC073-117-120050- /O.CAN.KBMX.TO.W.0042.000000T0000Z-110412T0100Z/ SHELBY AL-JEFFERSON AL- 740 PM CDT MON APR 11 2011 ...THE TORNADO WARNING FOR SOUTH CENTRAL JEFFERSON AND NORTHERN SHELBY COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745. TO REPORT SEVERE WEATHER...CALL 1-800-856-0758. LAT...LON 3350 8645 3323 8648 3333 8698 3347 8696 TIME...MOT...LOC 0040Z 273DEG 35KT 3337 8669 $$ 56
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 7:34 PM CDT | Tornado Warning | BMX | Jefferson, St. Clair, Shelby | 19 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.