Alert archive / Alabama / Frost Advisories in 2009

Frost Advisory 5, NWS Birmingham, AL

November 5, 200918 counties in Alabama

NWS Birmingham, AL issued this frost advisory at Nov 5, 2009, 3:29 PM CST for 18 counties in Alabama. It took effect at Nov 6, 2009, 2:00 AM CST. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Nov 5, 2009, 3:29 PM CST (21:29 UTC)
In effect from: Nov 6, 2009, 2:00 AM CST
Expired: Nov 6, 2009, 8:00 AM CST
In force: 6 hr
Issued by: NWS Birmingham, AL

Counties Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 57 km from the middle of the area, began a volume at 21:35 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, 9.5 hours before the alert went out and 56 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: -26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Nov 5, 3:26 PM CST, 3 minutes earlier.

Area forecast discussion, Nov 5, 3:26 PM CST, 3 minutes before

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Hazardous weather outlook, Nov 5, 11:02 AM CST, 4 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1102 AM CST THU NOV 5 2009

ALZ011>015-017>050-061800-
AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-
CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-
JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-
PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-
TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-
1102 AM CST THU NOV 5 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE
NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

RELATIVE HUMIDITY VALUES COULD DROP BELOW 25 PERCENT FOR 4 HOURS OR
LONGER FRIDAY AS A DRY AIRMASS CONTINUES TO DOMINATE WEATHER
CONDITIONS ACROSS THE SOUTHEAST. A FIRE WEATHER WATCH IS IN EFFECT
FOR ALL OF CENTRAL ALABAMA FROM 10AM TO 6 PM FRIDAY.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT IS NOT
EXPECTED AT THIS TIME.

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 5, 10:55 AM CST	Fire Weather Watch	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	4 hr
Nov 5, 2:55 PM CST	Red Flag Warning	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	27 hr

Nearby

Frost Advisories in Alabama, 2009 Every frost advisory in 2009

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.