Alert archive / Alabama / Mesoscale Discussions in 2003
Mesoscale Discussion 435
The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2003, 12:22 PM CDT for 12 counties in Alabama; 5 counties in Florida; George County, Greene County, Mississippi. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 7, 2003, 12:22 PM CDT (17:22 UTC)
- Expired
- Apr 7, 2003, 2:15 PM CDT
- In force
- 113 min
- 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 17:23 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.4 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.
741 ACUS11 KWNS 071722 SWOMCD SPC MCD 071722 ALZ000-FLZ000-MSZ000-071915- MESOSCALE DISCUSSION 0435 NWS STORM PREDICTION CENTER NORMAN OK 1222 PM CDT MON APR 07 2003 AREAS AFFECTED...PORTIONS SE TX...SRN LA...SRN MS CONCERNING...SEVERE THUNDERSTORM WATCH 112... VALID 071722Z - 071915Z SCATTERED SEVERE TSTMS WITH POTENTIALLY DESTRUCTIVE HAIL AND OCCASIONAL SEVERE GUSTS SHOULD CONTINUE IN BROKEN BAND FROM HARRIS/CHAMBERS/LIBERTY COUNTIES ENEWD ACROSS BTR REGION TO SRN MS BETWEEN GPT-LUL. ACTIVITY IS IN ZONE OF MAXIMIZED LOW LEVEL CONVERGENCE ASSOCIATED WITH PREFRONTAL TROUGH/CYCLONIC SHEAR LINE. BOTH BOWS AND HEAVY-PRECIP SUPERCELLS ARE POSSIBLE...WITH 45-60 KT 0-6 KM AGL SHEARS OVER REGION. MLCAPE 1500-2500 J/KG EXPECTED AS INFLOW-SECTOR AIR MASS CONTINUES TO DIABATICALLY WARM. HAIL UP TO 2.75 INCH REPORTED IN VERMILION PARISH ABOUT 1615Z AND UP TO 1.75 INCH HAIL ESTIMATED OVER OVER IBERIA PARISH LA AND SWRN HARRIS COUNTY TX DURING PAST 30 MINUTES. GIVEN CONTINUED FAVORABLE SHEAR PROFILES AND VERY STEEP MIDLEVEL LAPSE RATES 8.5-9.5 DEG C/KM -- ASSOCIATED WITH ELEVATED MIXED-LAYER AIR AND COMBINATION OF LARGE SCALE FORCING JUST AHEAD OF SHORTWAVE TROUGH -- THREAT FOR SIGNIFICANT SEVERE HAIL WILL CONTINUE IN THIS WW. ..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, 11:25 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 3 hr |
| Apr 7, 12:07 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.