Alert archive / Alabama / Mesoscale Discussions in 2003
Mesoscale Discussion 433
The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2003, 11:25 AM CDT for 12 counties in Alabama; 5 counties in Florida; George County, Greene County, Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 7, 2003, 11:25 AM CDT (16:25 UTC)
- Expired
- Apr 7, 2003, 2:00 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
Counties Baldwin County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, George County, MS, Greene County, MS
The radar
The Mobile radar (KMOB), 98 km from the middle of the area, began a volume at 16:28 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 4.4 hours before the alert went out and 243 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
- 1394 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 592 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 8.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 071625 SWOMCD SPC MCD 071625 ALZ000-FLZ000-MSZ000-071900- MESOSCALE DISCUSSION 0433 NWS STORM PREDICTION CENTER NORMAN OK 1125 AM CDT MON APR 07 2003 AREAS AFFECTED...SERN MS...SRN AL...WRN FL PANHANDLE CONCERNING...SEVERE TSTM POTENTIAL...SEVERE THUNDERSTORM WATCH 112... VALID 071625Z - 071900Z SEVERE POTENTIAL INCREASING E OF WW 112 AS INFLOW LAYER AIR MASS CONTINUES TO DIABATICALLY HEAT AND DESTABILIZE...AMIDST AT LEAST MARGINALLY FAVORABLE DEEP-LAYER KINEMATIC PROFILES. CLUSTER OF SEVERE TSTMS NOW OVER SRN MS IN ERN WW 112 EXPECTED TO MOVE ENEWD INTO THIS REGION WITH ADDITIONAL DEVELOPMENT POSSIBLE. WW MAY BE REQUIRED FOR THIS AREA WITHIN 1-2 HOURS. SURFACE MESOANALYSIS SHOWS PREFRONTAL CONFLUENCE/CONVERGENCE LINE QUASISTATIONARY FROM ABOUT 35 N ABY WSWWD TO 30 SSE MCB AND OVER SRN LA. WRN PORTION OF THIS LINE MAY DRIFT NWD BEFORE CONVECTIVE COVERAGE FILLS IN MORE SOLIDLY...WHILE ERN PORTION IS AN OUTFLOW BOUNDARY BEING REINFORCED BAROCLINICALLY BY CONVECTION NOW OVER S-CENTRAL AL. FORECAST HODOGRAPHS SHOW PRONOUNCED WEAKNESSES IN 2-4 KM AGL SR FLOWS...BUT 0-6 KM SHEAR 40-50 KT. MIDLEVEL LAPSE RATES WILL INCREASE AS ELEVATED MIXED-LAYER AIR -- EVIDENT THIS MORNING IN CRP/LCH RAOBS -- ADVECTS OVER AREA AND AS SUBTLE LARGE-SCALE ASCENT BEGINS AHEAD OF SHORTWAVE TROUGH NOW LIFTING NEWD OFF MID/UPPER TX COAST. SURFACE INSOLATION AND MAINTENANCE OF LOW 70S F DEW POINTS SHOULD CONTRIBUTE FURTHER TO ANTICIPATED MLCAPE 2000-2500 J/KG BY 18Z IN INFLOW SECTOR. ..EDWARDS.. 04/07/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TAE...BMX...MOB...LIX... 31718849 32028640 31388563 30648567 30208850 30938882
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 8:13 PM CDT | Mesoscale Discussion | SPC | Bibb, Chilton, Choctaw, Dallas, Fayette, Greene and 8 more | 2 hr |
| Apr 6, 9:48 PM CDT | Mesoscale Discussion | SPC | Autauga, Chilton, Choctaw, Clarke, Dallas, Hale and 6 more | 87 min |
| Apr 6, 10:15 PM CDT | Tornado Watch | SPC | Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 10 more | 5 hr |
| Apr 6, 11:39 PM CDT | Mesoscale Discussion | SPC | Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 11 more | 2 hr |
| Apr 7, 1:51 AM CDT | Mesoscale Discussion | SPC | Bullock, Butler, Lowndes, Macon, Montgomery | 54 min |
| Apr 7, 2:55 AM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Chilton, Choctaw, Dallas and 13 more | 4 hr |
| Apr 7, 4:49 AM CDT | Mesoscale Discussion | SPC | Autauga, Chambers, Chilton, Coosa, Dallas, Elmore and 11 more | 3 hr |
| Apr 7, 9:11 AM CDT | Mesoscale Discussion | SPC | Barbour, Coffee, Conecuh, Covington, Crenshaw, Dale and 6 more | 3 hr |
| Apr 7, 9:40 AM CDT | Tornado Watch | SPC | Barbour, Bullock, Macon, Pike, Russell | 5 hr |
| Apr 7, 12:07 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 113 min |
| Apr 7, 12:22 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 113 min |
| Apr 7, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Covington, Escambia, Mobile | 5 hr |
| Apr 7, 5:58 PM CDT | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile | 2 hr |
| Apr 7, 10:05 AM CDT | Severe Thunderstorm Watch | SPC | Amite, Forrest, George, Greene, Hancock, Harrison and 11 more | 6 hr |
| Apr 7, 11:02 AM CDT | Mesoscale Discussion | SPC | Forrest, Lamar, Pearl River, Perry, Stone | 3 hr |
| Apr 7, 2:13 PM CDT | Mesoscale Discussion | SPC | Hancock, Harrison, Pearl River, Perry, Stone | 3 hr |
| Apr 7, 2:36 PM CDT | Mesoscale Discussion | SPC | Hancock, Harrison, Pearl River, Perry, Stone | 114 min |
Nearby
Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Florida, 2003Mesoscale Discussions in Mississippi, 2003Every mesoscale discussion in 2003
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.