Alert archive / Arizona / Flash Flood Warnings in 1993

Flash Flood Warning 12, NWS Tucson, AZ

August 7, 1993Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 7, 1993, 2:16 PM MST for Pima County, Arizona. It was in force for 119 min.

The area

The counties it named.

The facts

Issued: Aug 7, 1993, 2:16 PM MST (21:16 UTC)
Expired: Aug 7, 1993, 4:15 PM MST
In force: 119 min
Issued by: NWS Tucson, AZ
Area: Whole counties

County Pima County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 9.3 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-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: 90 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1706 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 14 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 072117
FFWTUS
AZC019-072315-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON ARIZONA
216 PM MST SAT AUG 7 1993
 
THE NATIONAL WEATHER SERVICE IN TUCSON ARIZONA HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  415 PM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL ARIZONA
 
   ...EASTERN PIMA COUNTY
 
AT 210 PM MST VISUAL OBSERVATIONS AND WEATHER RADAR SHOWED A STRONG
THUNDERSTORM IN PROGRESS APPROXIMATELY 5 MILES WEST OF TUCSON. ALSO
AT 210 PM MST A SPOTTER 6 MILES WEST OF THE AIRPORT REPORTED 1 INCH
OF RAIN IN THE PAST 1/2 HOUR...ACCOMPANIED BY 41 MPH WINDS...PEA SIZED
HAIL...FREQUENT LIGHTNING...AND STREET FLOODING.  MOST CELLS...
INCLUDING THE ONE WEST OF TUCSON...WERE MOVING TO THE NORTHEAST AT 5 TO
10 MPH.  EXPECT CONTINUED THUNDERSTORM DEVELOPMENT THROUGHOUT THE REST
OF THE AFTERNOON.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN.  IF OUTSIDE...MOVE TO A
SHELTER OR INSIDE A STRONG BUILDING...BUT STAY AWAY FROM WINDOWS.
 
MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 2:16 PM MST	Severe Thunderstorm Warning	TWC	Pima	119 min

Nearby

Flash Flood Warnings in Arizona, 1993 Every flash flood warning in 1993

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.