Alert archive / Alabama / Flash Flood Warnings in 1987

Flash Flood Warning 1, NWS Mobile, AL

February 15, 1987Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Feb 15, 1987, 4:20 PM CST for Mobile County, Alabama. It was in force for 100 min.

The area

The counties it named.

The facts

Issued
Feb 15, 1987, 4:20 PM CST (22:20 UTC)
Expired
Feb 15, 1987, 6:00 PM CST
In force
100 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Mobile County, AL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Boothville, LA (KBVE), launched 12:00Z, 10.3 hours before the alert went out and 190 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-pSkew-T log-p diagram, Boothville, LA at 12:00Z on 1987-02-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 497 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boothville, LA at 12:00Z on 1987-02-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
497 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
467 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

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 flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Feb 15, 1:30 PM CST, 2 hours 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
130 PM CST SUN FEB 15 1987

...TORNADO WATCH NUMBER 10 IS IN EFFECT UNTIL 600 PM FOR ALL COUNTIES
IN SOUTHEAST MISSISSIPPI...

AT 125 PM CST MOBILE RADAR SHOWED A BROAD AREA OF RAIN WITH SCATTERED
THUNDERSTORMS OVER SOUTHEAST MISSISSIPPI...EXTREME SOUTHWEST ALABAMA
AND THE ADJACENT COASTAL WATERS. A LINE OF STRONG THUNDERSTORMS FROM
JUST WEST OF HATTIESBURG EXTENDED INTO THE NEW ORLEANS AREA. THIS LINE
IS MOVING TO THE EAST AT NEAR 25 MPH...AS INDIVIDUAL STORMS MOVE TO THE
NORTHEAST RAPIDLY.

PERSONS IN SOUTHEAST MISSISSIPPI SHOULD BE ALERT FOR POSSIBLE SEVERE
WEATHER AND MOVE TO A SAFE PLACE IF THREATENING WEATH%ER IS SIGHTED.

BOATERS AND MARINE INTRESTS IN THE MISSISSIPPI AND ALABAMA COASTAL
WATERS SHOULD SEEK SAFE HARBOR UNTIL THUNDERSTORMS MOVE OUT OF THE
AREA.
Special weather statement, Feb 15, 1:36 PM CST, 2 hours 44 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE PENSACOLA FL
135 PM CST SUN FEB 15 1987

AT 130 PM CST...A LARGE AREA OF RAIN MIXED WITH SCATTERED THUNDER-
STORMS...SOME VERY HEAVY...WAS OVER SOUTHEAST LOUISIANA...SOUTHEAST
MISSISSIPPI...SOUTHWEST ALABAMA...AND THE ADJOINING COASTAL WATERS...
AND WAS MOVING INTO THE WEST PART OF THE FLORIDA PANHANDLE.
THE HEAVIER THUNDERSTORMS WERE AROUND THE MOBILE AREA AND IN COASTAL
MISSISSIPPI.
THE THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR.

THE HEAVIER THUNDERSTORMS WILL PRODUCE PERIODS OF VERY HEAVY RAIN...
FREQUENT LIGHTNING...GUSTY WINDS AROUND 40 MILES AN HOUR...FLOODING
OF STREETS AND POOR DRAINAGE AREAS...AND' FOR MARINE INTERESTS THE
ADDITIONAL ROUGH SEAS AND REDUCED VISIBILITY.
PERSONS SHOULD TAKE ANY NECESSARY PRECAUTIONS FOR THESE CONDITIONS.
Special weather statement, Feb 15, 3:35 PM CST, 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
335 PM CST SUN FEB 15 1987

...A SPECIAL MARINE WARNING IS IN EFFECT FOR THE MISSISSIPPI-ALABAMA
COASTAL WATERS UNTIL 500 PM CST...

...TORNADO WATCH NUMBER 10 WAS CANCELED FOR SOUTHEAST MISSISSIPPI AT
AT 330 PM CST...

...TORNADO WATCH NUMBER 11 IS IN EFFECT FOR ALL COUNTIES IN SOUTHWEST
ALABAMA UNTIL 800 PM CST...

AT 330 PM CST MOBILE RADAR SHOWED A BROAD AREA OF RAIN WITH SCATTERED
THUNDERSTORMS OVER SOUTHWEST ALABAMA...THE WESTERN PART OF NORTHWEST
FLORIDA...EXTREME SOUTHEAST MISSISSIPPI AND THE ADJACENT COASTAL WATERS.
THE STRONGEST THUNDERSTORMS WERE LOCATED JUST WEST THROUGH NORTHWEST OF
MOBILE...MOVING RAPIDLY TO THE NORTHEAST.

IF THREATENING WEATHER APPROCHES...GO TO A SAFE PLACE IMMEDIATELY.
Special weather statement, Feb 15, 3:40 PM CST, 40 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE PENSACOLA FL
335 PM CST SUN FEB 15 1987

AT 330 PM CST...A TORNADO WATCH WAS IN EFFECT FOR ESCAMBIA...SANTA
ROSA...OKALOOSA...WALTON...HOLMES...WASHINGTON...AND BAY COUNTIES IN
THE FLORIDA PANHANDLE UNTIL 8 PM CST.

NUMEROUS HEAVY THUNDERSTORMS WERE OVER EXTREME SOUTHEAST MISSISSIPPI...
SOUTHWEST ALABAMA...AND THE COASTAL WATERS SOUTH OF THERE DOWN TO THE
MOUTH OF THE MISSISSIPPI RIVER. ISOLATED THUNDERSTORMS WERE OCCURRING
OVER THE EXTREME WESTERN TIP OF THE FLORIDA PANHANDLE NEAR PENSACOLA
AND THE MILTON/CRESTVIEW AREAS. WIDESPREAD LIGHT RAIN ACCOMPANIED THE
STORMS AND WAS OVER SOUTHEAST MISSISSIPPI...SOUTHWEST ALABAMA...THE
WESTERN TIP OF THE FLORIDA PANHANDLE...AND THE COASTAL WATERS UP TO 100
MILES OFFSHORE.

MOVEMENT OF THE RAINS AND STORMS WAS TO THE EAST AND NORTHEAST AT 30
TO 35 MPH.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 15, 5:24 PM CSTSevere Thunderstorm WarningMOBDallas66 min

Nearby

Flash Flood Warnings in Alabama, 1987Every flash flood warning in 1987

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.