Alert archive / Alabama / Special Weather Statements in 2021
Special Weather Statement, NWS Birmingham, AL
NWS Birmingham, AL issued this special weather statement at Jul 30, 2021, 6:21 PM CDT for St. Clair County, Alabama. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2021, 6:21 PM CDT (23:21 UTC)
- Expired
- Jul 30, 2021, 6:45 PM CDT
- In force
- 24 min
- Issued by
- NWS Birmingham, AL
County St. Clair County, AL
The radar
The Birmingham radar (KBMX), 89 km from the middle of the area, began a volume at 23:26 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.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 11.4 hours before the alert went out and 89 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
- 1105 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1087 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
551
WWUS84 KBMX 302321
SPSBMX
Special Weather Statement
National Weather Service Birmingham AL
621 PM CDT Fri Jul 30 2021
ALZ026-302345-
St. Clair AL-
621 PM CDT Fri Jul 30 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ST. CLAIR COUNTY
UNTIL 645 PM CDT...
At 621 PM CDT, Doppler radar was tracking a strong thunderstorm near
Steele, or 10 miles east of Oneonta, moving southeast at 20 mph.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Ashville, Ragland, Steele, Neely Henry Lake, Logan Martin Lake,
Whitney Junction, Alabama International Dragway, Neely Henry Dam,
Horse Pens Forty, I 59 Rest Areas At Oneonta and Camp Sumatanga.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3390 8614 3389 8611 3386 8610 3387 8607
3385 8605 3381 8607 3377 8604 3371 8613
3371 8614 3368 8617 3370 8618 3370 8620
3368 8620 3367 8619 3364 8623 3387 8636
3389 8634 3391 8635 3393 8632 3398 8622
TIME...MOT...LOC 2321Z 320DEG 18KT 3392 8629
$$
CBDThe office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 4:28 PM CDT | Special Weather Statement | BMX | Etowah | 47 min |
| Jul 30, 4:36 PM CDT | Special Weather Statement | BMX | Fayette | 24 min |
| Jul 30, 5:08 PM CDT | Special Weather Statement | BMX | Blount | 37 min |
| Jul 30, 5:44 PM CDT | Special Weather Statement | BMX | Calhoun | 31 min |
| Jul 30, 6:08 PM CDT | Special Weather Statement | BMX | Jefferson | 37 min |
| Jul 30, 6:16 PM CDT | Special Weather Statement | BMX | Cherokee | 14 min |
Nearby
Special Weather Statements in Alabama, 2021Every special weather statement in 2021
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.