Alert archive / Alabama / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 12
The Storm Prediction Center issued this severe thunderstorm watch at Mar 31, 2015, 4:08 PM CDT for 11 counties in Alabama. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2015, 4:08 PM CDT (21:08 UTC)
- Expired
- Mar 31, 2015, 10:59 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Colbert County, AL, Cullman County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL
The radar
The Northeast Alabama radar (KHTX), 96 km from the middle of the area, began a volume at 21:10 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 4:09 PM CDT | Severe Thunderstorm Warning | HUN | Cullman | 47 min |
| Mar 31, 4:26 PM CDT | Severe Thunderstorm Warning | HUN | Franklin, Lawrence | 34 min |
| Mar 31, 4:53 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Marshall, Morgan | 52 min |
| Mar 31, 4:56 PM CDT | Severe Thunderstorm Warning | HUN | Franklin, Lawrence | 10 min |
| Mar 31, 5:25 PM CDT | Severe Thunderstorm Warning | HUN | Marshall | 35 min |
| Mar 31, 5:44 PM CDT | Severe Thunderstorm Warning | HUN | Cullman, Marshall, Morgan | 39 min |
| Mar 31, 5:56 PM CDT | Severe Thunderstorm Warning | HUN | Lauderdale | 34 min |
| Mar 31, 6:00 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale | 30 min |
| Mar 31, 6:21 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Marshall | 39 min |
| Mar 31, 6:26 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale | 49 min |
| Mar 31, 6:46 PM CDT | Severe Thunderstorm Warning | HUN | Cullman | 44 min |
| Mar 31, 6:56 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Marshall | 35 min |
| Mar 31, 7:00 PM CDT | Flash Flood Warning | HUN | Colbert, Lauderdale | 3 hr |
| Mar 31, 7:12 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale | 48 min |
| Mar 31, 7:43 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale, Lawrence, Limestone | 47 min |
| Mar 31, 7:57 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale | 48 min |
| Mar 31, 8:07 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson | 53 min |
| Mar 31, 8:26 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson | 49 min |
| Mar 31, 8:41 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Lauderdale | 49 min |
| Mar 31, 9:04 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb | 41 min |
| Mar 31, 9:16 PM CDT | Severe Thunderstorm Warning | HUN | Lawrence | 29 min |
| Mar 31, 9:28 PM CDT | Severe Thunderstorm Warning | HUN | Colbert | 17 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.1 hours before the alert went out and 167 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1975 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 12:47 PM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 32 more | 118 min |
| Mar 31, 1:22 PM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 27 more | 9 hr |
| Mar 31, 3:41 PM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 28 more | 64 min |
| Mar 31, 6:00 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Chilton and 20 more | 60 min |
Nearby
Severe Thunderstorm Watches in Alabama, 2015Every severe thunderstorm watch in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.