Alert archive / Alabama / Mesoscale Discussions in 2009
Mesoscale Discussion 2021
The Storm Prediction Center issued this mesoscale discussion at Sep 16, 2009, 12:13 PM CDT for 33 counties in Alabama; Okaloosa County, Florida; Quitman County, Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 16, 2009, 12:13 PM CDT (17:13 UTC)
- Expired
- Sep 16, 2009, 2:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Chilton County, AL, Clarke County, AL, Clay County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Russell County, AL, Shelby County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Wilcox County, AL, Okaloosa County, FL, Quitman County, GA
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 5.2 hours before the alert went out and 110 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
- 1274 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 460 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 161713 SWOMCD SPC MCD 161713 GAZ000-ALZ000-FLZ000-161915- MESOSCALE DISCUSSION 2021 NWS STORM PREDICTION CENTER NORMAN OK 1213 PM CDT WED SEP 16 2009 AREAS AFFECTED...CENTRAL/SOUTHERN AL AND FL PANHANDLE CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 161713Z - 161915Z POTENTIAL FOR A BRIEF/ISOLATED TORNADO OR TWO...AND WIND DAMAGE...MAY MODESTLY INCREASE THROUGH THE AFTERNOON MAINLY ACROSS PORTIONS OF CENTRAL/SOUTHERN AL. ISOLATED/MARGINAL NATURE OF THE RISK SHOULD PRECLUDE A WATCH ISSUANCE...BUT DEVELOPMENTAL TRENDS WILL CONTINUE TO BE MONITORED. AS THE PARENT CYCLONE REMAINS OVER THE ARKLATEX VICINITY...AN INCREASE IN SHOWERS/TSTMS APPEARS TO BE TIED TO A SUBTROPICAL/MID LEVEL DISTURBANCE CROSSING THE CENTRAL GULF AND ADJACENT GULF COAST STATES...ALONG WITH A VERY MOIST/WEAKLY CAPPED BOUNDARY LAYER. AS HAS BEEN THE CASE FOR THE PAST FEW DAYS...WEAK DEEP LAYER FLOW/POOR MID LEVEL LAPSE RATES WILL REMAIN LIMITING FACTORS FOR A MORE APPRECIABLE SEVERE RISK. NONETHELESS...THE COMBINATION OF AMPLE SURFACE HEATING /LOWER 80S F/ AND LOWER TO MIDDLE 70S F DEWPOINTS...ALONG WITH MODESTLY BACKED /SOUTHEASTERLY/ LOW LEVEL FLOW ESPECIALLY ACROSS CENTRAL/SOUTHERN AL WITH 0-1 KM SRH TO AROUND 100 MS/S2...MAY BE SUFFICIENT FOR ISOLATED/BRIEF TORNADOES AND/OR WIND DAMAGE. ..GUYER.. 09/16/2009 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FFC...TAE...BMX...MOB... LAT...LON 33328553 31968484 30508643 31038808 33428771 33328553
Nearby
Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in Florida, 2009Mesoscale Discussions in Georgia, 2009Every mesoscale discussion 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.