Alert archive / Arizona / Flash Flood Warnings in 1996

Flash Flood Warning 87, NWS Tucson, AZ

September 3, 1996Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 3, 1996, 9:30 AM MST for Pima County, Arizona. It was in force for 60 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
Sep 3, 1996, 9:30 AM MST (16:30 UTC)
Expired
Sep 3, 1996, 10:30 AM MST
In force
60 min
Issued by
NWS Tucson, AZ
Area
Whole counties

County Pima County, AZ

The radar

The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 16:31 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

Tuscon, AZ (KTUS), launched 12:00Z, 4.5 hours before the alert went out and 84 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, Tuscon, AZ at 12:00Z on 1996-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1155 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 1996-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.193958Sfc1 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
1155 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1425 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KTUS 031629
FFWTUS
AZC019-031730-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON ARIZONA
930 AM MST TUE SEP 3 1996
 
THE NATIONAL WEATHER SERVICE IN TUCSON ARIZONA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1030 AM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL ARIZONA
 
   ...EASTERN PIMA COUNTY
 
AT 925 AM...TUCSON DOPPLER RADAR CONTINUED TO SHOW VERY HEAVY
RAINFALL CONTINUING FROM NORTHWEST TUCSON SOUTHWEST TO THE THREE
POINTS AREA. MOVEMENT OF THESE STORMS IS TO THE WEST-SOUTHWEST
AROUND 15 MPH. RAINFALL ACROSS THE REST OF METRO TUCSON IS EITHER
LIGHT OR HAS DIMINISHED COMPLETELY. WIDESPREAD FLOODING THOUGH
CONTINUES ACROSS PARTS OF METRO TUCSON...THUS THE FLASH FLOOD
WARNING FOR EASTERN PIMA COUNTY HAS BEEN EXTENDED UNTIL 1030 AM.
 
AGAIN...WIDESPREAD FLOODING HAS BEEN REPORTED IN TUCSON WITH MANY
RESCUES IN AND AROUND FLOODED WASHES. FLOODED ROADS AND DIVERSIONS
AROUND FLOODED AREAS HAVE LED TO WIDESPREAD TRAFFIC PROBLEMS THIS
MORNING.
 
GLUECK

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.

NWS Tucson, AZ wrote its last area forecast discussion before this flash flood warning went out at Sep 3, 9:26 AM MST, 4 minutes earlier.

Area forecast discussion, Sep 3, 9:26 AM MST, 4 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
930 AM MST TUE SEP 3 1996

WHAT A MORNING! UP TO 5 INCHES OF RAIN REPORTED OVER THE TUS
METRO AREA THIS MORNING WITH MANY REPORTS OF FLOODING AND
STRANDED MOTORISTS. OUTFLOW FROM CONVECTION OVER THE RIM LAST
EVENING COLLIDED WITH A VERY UNSTABLE AMS OVER THE AREA CAUSING
EXPLOSIVE THUNDERSTORM DEVELOPMENT. TUS SOUNDING WHICH WAS TAKEN
JUST BEFORE THUNDERSTORMS DEVELOPED WAS EXTREMELY UNSTABLE WITH
LI 0F -6 CAPE AROUND 2000 J/KG. SOUNDING SHOWED A SUBSTANTIAL
MOISTURE INCREASE FROM LAST EVENING AT THE LOWER LEVELS FROM
CONTINUING GULD SURGE. AMS WAS JUST WAITING FOR SOMETHING TO GIVE
IT A LITTLE LIFT IN ORDER TO EXPLODE. GULF SURGE STILL CONTINUING
SO SEE LITTLE REASON WHY AMS WONT STAY VERY MOIST AND UNSTABLE
NEXT FEW DAYS. THIS ALONG WITH DEVELOPING PAC NW TROF TURNING
UPPER FLOW TO A SLY DIRECTION AND POSSIBLY BRINGING UP MOISTURE
FROM T.S. ELIDA COULD MAKE THE REST OF THE WEEK A VERY ACTIVE
ONE. WITH ALL THE RAIN THIS MORNING ACROSS ZONES 21/23 STABLIZING
AMS EXPECT THIS AFTERNOON TO BE FAIRLY BENEIGN THIS AREA AND MAX
TEMPS TO BE COOLER THAN CURRENT FORECASTS. TUS 322. COLLINS

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 3, 5:24 AM MSTFlash Flood WarningTWCPima66 min
Sep 3, 5:24 AM MSTSevere Thunderstorm WarningTWCPima66 min
Sep 3, 5:52 AM MSTFlash Flood WarningTWCPima58 min
Sep 3, 5:52 AM MSTSevere Thunderstorm WarningTWCPima58 min
Sep 3, 6:46 AM MSTFlash Flood WarningTWCPima, Santa Cruz74 min
Sep 3, 7:57 AM MSTFlash Flood WarningTWCPima93 min
Sep 3, 3:59 PM MSTSevere Thunderstorm WarningTWCCochise46 min

Nearby

Flash Flood Warnings in Arizona, 1996Every flash flood warning in 1996

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.