Alert archive / Alabama / Dense Fog Advisories in 2021
Dense Fog Advisory 21, NWS Birmingham, AL
NWS Birmingham, AL issued this dense fog advisory at Dec 6, 2021, 5:22 AM CST for 6 counties in Alabama. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Dec 6, 2021, 5:22 AM CST (11:22 UTC)
- Expired
- Dec 6, 2021, 9:00 AM CST
- In force
- 4 hr
- Issued by
- NWS Birmingham, AL
Counties Barbour County, AL, Bullock County, AL, Lee County, AL, Macon County, AL, Pike County, AL, Russell County, AL
The radar
The Maxwell AFB radar (KMXX), 46 km from the middle of the area, began a volume at 11:25 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 00:00Z, 11.4 hours before the alert went out and 161 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
- 94 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1096 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
615 WWUS74 KBMX 061122 NPWBMX URGENT - WEATHER MESSAGE National Weather Service Birmingham AL 522 AM CST Mon Dec 6 2021 ALZ045>050-061500- /O.NEW.KBMX.FG.Y.0021.211206T1122Z-211206T1500Z/ Macon-Bullock-Lee-Russell-Pike-Barbour- Including the cities of Tuskegee, Union Springs, Auburn, Opelika, Phenix City, Troy, and Eufaula 522 AM CST Mon Dec 6 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Macon, Bullock, Lee, Russell, Pike and Barbour Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ 08
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 6, 7:55 AM CST | Special Weather Statement | BMX | Fayette, Lamar, Pickens | 50 min |
| Dec 6, 8:36 AM CST | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Pickens, Tuscaloosa | 54 min |
| Dec 6, 9:09 AM CST | Severe Thunderstorm Warning | BMX | Walker | 21 min |
| Dec 6, 9:17 AM CST | Special Weather Statement | BMX | Jefferson | 43 min |
| Dec 6, 9:33 AM CST | Special Weather Statement | BMX | Bibb, Shelby | 42 min |
| Dec 6, 9:51 AM CST | Special Weather Statement | BMX | Marshall | 24 min |
| Dec 6, 10:02 AM CST | Special Weather Statement | BMX | St. Clair | 43 min |
| Dec 6, 10:15 AM CST | Special Weather Statement | BMX | Chilton, Shelby, Talladega | 45 min |
| Dec 6, 10:42 AM CST | Severe Thunderstorm Warning | BMX | Clay, Coosa, Talladega | 39 min |
| Dec 6, 10:51 AM CST | Special Weather Statement | BMX | Greene, Hale, Sumter | 39 min |
| Dec 6, 10:53 AM CST | Special Weather Statement | BMX | Coosa, Elmore, Tallapoosa | 52 min |
| Dec 6, 11:24 AM CST | Special Weather Statement | BMX | Chambers, Randolph | 66 min |
| Dec 6, 11:36 AM CST | Special Weather Statement | BMX | Elmore | 24 min |
| Dec 6, 11:37 AM CST | Special Weather Statement | BMX | Hale, Perry | 38 min |
| Dec 6, 12:03 PM CST | Special Weather Statement | BMX | Lee | 57 min |
Nearby
Dense Fog Advisories in Alabama, 2021Every dense fog advisory 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.