Alert archive / Alabama / Frost Advisories in 2019
Frost Advisory 1, NWS Birmingham, AL
NWS Birmingham, AL issued this frost advisory at Nov 1, 2019, 3:59 AM CDT for 19 counties in Alabama. It took effect at Nov 1, 2019, 11:00 PM CDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Nov 1, 2019, 3:59 AM CDT (08:59 UTC)
- In effect from
- Nov 1, 2019, 11:00 PM CDT
- Expired
- Nov 2, 2019, 9:00 AM CDT
- In force
- 10 hr
- Issued by
- NWS Birmingham, AL
Counties Autauga County, AL, Bibb County, AL, Chambers County, AL, Chilton County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tallapoosa County, AL, Tuscaloosa County, AL
The radar
The Birmingham radar (KBMX), 54 km from the middle of the area, began a volume at 09:01 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, 9.0 hours before the alert went out and 55 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
- 912 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- -200 m²/s²
- 0-3 km storm-relative helicity
- -219 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Birmingham, AL wrote its last area forecast discussion before this frost advisory went out at Oct 31, 11:58 PM CDT, 4 hours 1 minute earlier.
Area forecast discussion, Oct 31, 11:58 PM CDT, 4 hours 1 minute before
Area Forecast Discussion National Weather Service Birmingham AL 1158 PM CDT Thu Oct 31 2019 .UPDATE... For 06Z Aviation. && .SHORT TERM... /Updated at 0220 PM CDT Thu Oct 31 2019/ The cold front exited Central Alabama around 18Z, and only some light showers remain east of Interstate 65. The rain should end by 22Z-23Z. The biggest impact on the trick-or-treaters will be the cold and windy conditions. Temperatures are already in the 40s/50s and will continue to drop into the upper 30s and 40s by 7 PM. NW winds will be sustained around 10-15 mph with gusts up to 25 mph through the remainder of the afternoon, with speeds slowly decreasing through the evening. Make sure those little ones are bundled up tonight! But, who are we kidding, the kids will probably fair better with the cold than the adults. They know there's a ton of candy out there waiting for them. No real changes were made to the forecast beyond tonight. Lows will once again dip into the 30s Friday night, but confidence in a freeze is just not high enough to warrant a Freeze Watch at this time. However, frost is definitely likely across portions of the forecast area. 19 .LONG TERM... /Updated at 0307 AM CDT Thu Oct 31 2019/ Friday through Wednesday... Overall a fairly benign pattern in regards to rain potential. We will see a second front move through on Saturday, but this front will be dry. Southerly flow resumes on Monday night into Tuesday. The extended models agree on the overall flow, but disagree on the amplification. Thus the amount of precipitation is different. To account for this added in a slight chance of rain for Tuesday into Tuesday night timeframe. Otherwise dry and fairly seasonable temperatures. In regards to temperatures, Friday night will be a little tricky. Model trends have been a touch warmer than previous, but winds will calm down, so radiational cooling will be the highest. With that said have opted to keep the cold wording in the HWO, but not issue a second freeze watch. In fact it is highly possible that we wind up going with a frost advisory versus freeze warning. Either way, you need to take precaution for these cold temperatures. 16 && .AVIATION... 06Z TAF Discussion. A cold northerly flow will prevail thru the period. Patchy clouds will bases arnd 3000 feet agl over northeast Alabama may impact KANB thru 08z, otherwise clear skies thru the forecast period with north winds 5-8 kts. 58/rose && .FIRE WEATHER... A much colder and drier airmass will continue to spread across Central Alabama in the wake of this morning's cold front. The remaining showers in the east will exit by this evening with dry conditions persisting area wide through the weekend. Minimum RH values will remain above 30 percent. && .PRELIMINARY POINT TEMPS/POPS... Gadsden 29 55 33 56 34 / 0 0 0 0 0 Anniston 30 56 34 57 35 / 10 0 0 0 0 Birmingham 32 56 35 57 36 / 0 0 0 0 0 Tuscaloosa 33 55 35 57 36 / 0 0 0 0 0 Calera 32 56 34 58 35 / 0 0 0 0 0 Auburn 33 58 37 60 37 / 10 0 0 0 0 Montgomery 35 60 37 61 38 / 10 0 0 0 0 Troy 34 59 37 62 37 / 10 0 0 0 0 && .BMX WATCHES/WARNINGS/ADVISORIES/... Freeze Warning until 9 AM CDT Friday for the following counties: Blount...Calhoun...Cherokee...Clay...Cleburne...Etowah... Fayette...Jefferson...Lamar...Marion...Pickens...Randolph... Shelby...St. Clair...Talladega...Tuscaloosa...Walker...Winston. &&
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 1, 3:59 AM CDT | Freeze Warning | BMX | Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 10 more | 29 hr |
Nearby
Frost Advisories in Alabama, 2019Every frost advisory in 2019
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.