Alert archive / Arizona / Flash Flood Warnings in 2002

Flash Flood Warning 16, NWS Tucson, AZ

August 4, 2002Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 4, 2002, 2:05 PM MST for Pima County, Arizona. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 4, 2002, 2:05 PM MST (21:05 UTC)
Expired
Aug 4, 2002, 3:00 PM MST
In force
55 min
Issued by
NWS Tucson, AZ
Area
Counties, with a storm outline in the text

County Pima County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 9.1 hours before the alert went out and 31 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 2002-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 535 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 2002-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.1939Sfc1 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
535 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1234 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
97 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 
WGUS55 KTWC 042105
FFWTWC
AZC019-042200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
204 PM MST SUN AUG 4 2002

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN PIMA COUNTY IN ARIZONA
    THIS INCLUDES THE CITY OF ORO VALLEY

* UNTIL 300 PM MST

* AT 155 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN OVER ORO VALLEY...OR ABOUT 7 MILES EAST OF MARANA...MOVING 
  NORTHWEST AT 10 MPH.

STREETS...UNDERPASSES AND NORMALLY DRY WASHES WILL FLOOD QUICKLY. DO
NOT DRIVE INTO FLOODED AREAS OF AROUND BARRICADES. IF THE ROAD AHEAD
IS BLOCKED...TURN AROUND AND TAKE ANOTHER ROUTE.

THIS FLASH FLOOD WARNING UPGRADES AND REPLACES THE URBAN AND SMALL
STREAM FLOOD ADVISORY FOR THIS AREA.

LAT...LON 3239 11090 3251 11089 3251 11118 3238 11112

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 5:16 PM MSTFlash Flood WarningTWCPima
Aug 3, 5:18 PM MSTFlash Flood WarningTWCPima57 min
Aug 4, 2:04 PM MSTFlash Flood WarningTWCPima
Aug 4, 3:00 PM MSTFlash Flood WarningTWCPima60 min
Aug 4, 3:01 PM MSTFlash Flood WarningTWCPima119 min

Nearby

Flash Flood Warnings in Arizona, 2002Every flash flood warning in 2002

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.