Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 51, NWS Mobile, AL

March 9, 1999Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 9, 1999, 3:17 AM CST for Mobile County, Alabama. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 9, 1999, 3:17 AM CST (09:17 UTC)
Expired: Mar 9, 1999, 4:15 AM CST
In force: 58 min
Issued by: NWS Mobile, AL
Area: Whole counties

County Mobile County, AL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 9, 1:00 AM CST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.3 hours before the alert went out and 152 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: 230 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 298 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 9, 3:10 AM CST, 7 minutes earlier.

Area forecast discussion, Mar 9, 3:10 AM CST, 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOBILE AL
310 AM CST TUE MAR 9 1999

SEVERAL LINES OF SVR TSTMS CURRENTLY MOVG SE ACROSS CWA. NUMEROUS
REPORTS OF LARGE HAIL (GOLFBALL SIZE AND SLIGHTLY LARGER) AND SOME
WIND DAMAGE REPORTS AS WELL HAVE BEEN RECEIVED. APPEARS SOUTHERN AL
ZONES AND NW FLORIDA ZONES MOST LIKELY TO SEE SVR WEATHER OVER NEXT
COUPLE OF HOURS. THIS PREFRONTAL ACTIVITY WILL EXIT CWA BY AROUND
MID-MORNING WITH COLD FRONT CURRENTLY JUST W OF MS RIVER MOVG ACROSS
REGION BY EARLY AFTERNOON. ACTIVITY HAS BEEN ENHANCED THIS MORNING AS
RRQ OF MID/UPPER LEVEL JET MOVG ACROSS REGION. MID/UPPER SUPPORT LOOK
TO BE E OF FA SHORTLY AFTER 12Z...WHILE HIEST CAPES AND HELICITIES
MOVE E OF AREA BY 18Z. SO...AFTER 12Z THIS MORNING...ANY SEVERE
THREAT LOOKS TO BE CONFINED TO FL PANHANDLE AND SE ALABAMA ENDING BY
AROUND NOON. AFTER FROPA TODAY...HI PRES BUILDS OVER REGION FOR
REMAINDER OF PERIOD...WITH NO POPS. TEMP GUIDANCE LOOKS REASONABLE.

OVER THE COASTAL WATERS...SCAS TODAY BUT GRADIENT WEAKENING AND
WINDS SHOULD BEGIN TO DECREASE LATER TODAY. CURRENT TIDAL INFO
INDICATES WATER LEVELS ABOUT 2 FT ABOVE NORMAL THIS MORNING...BUT
COMING UP ON LOW TIDE ACROSS REGION...AND NO COASTAL FLOODING
PROBLEMS REPORTED. NEXT HI TIDE LATE THIS AFTERNOON...BY WHICH TIME
WINDS WILL HAVE SHIFTED W...SO WILL NOT CONTINUE CFW TODAY. SCATTERED
TO NUMEROUS SHOWERS/TSTMS THIS MORNING OVER MARINE AREA PRODUCING
LOCALLY HIER WINDS/SEAS. WINDS SHIFTING W-NE TONIGHT-WED...10 TO 15
KT. SEAS DIMINISHING TO 4 FT. PROTECTED WATERS BECOMING CHOPPY TO
LIGHT CHOP THROUGH PERIOD.

MOB 73/46/70/51 6000  PNS 74/49/70/52 6000
DTS 73/48/69/50 6000  GZH 68/40/66/42 5000 12

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 8, 11:37 PM CST	Severe Thunderstorm Warning	MOB	Choctaw	53 min
Mar 9, 12:27 AM CST	Severe Thunderstorm Warning	MOB	Washington	63 min
Mar 9, 2:33 AM CST	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	57 min
Mar 9, 3:49 AM CST	Severe Thunderstorm Warning	MOB	Baldwin	71 min
Mar 9, 4:25 AM CST	Tornado Warning	MOB	Baldwin	80 min
Mar 9, 5:49 AM CST	Tornado Warning	MOB	Baldwin	26 min
Mar 9, 2:39 AM CST	Severe Thunderstorm Warning	MOB	Escambia	51 min
Mar 9, 3:04 AM CST	Severe Thunderstorm Warning	MOB	Santa Rosa	41 min
Mar 9, 3:27 AM CST	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	78 min
Mar 9, 4:44 AM CST	Severe Thunderstorm Warning	MOB	Escambia	76 min
Mar 9, 4:59 AM CST	Tornado Warning	MOB	Escambia	61 min
Mar 9, 5:29 AM CST	Tornado Warning	MOB	Okaloosa	61 min
Mar 8, 11:37 PM CST	Severe Thunderstorm Warning	MOB	Perry, Wayne	53 min
Mar 9, 12:19 AM CST	Tornado Warning	MOB	Greene	56 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1999 Every severe thunderstorm warning in 1999

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.