Alert archive / Arizona / Flash Flood Warnings in 2002

Flash Flood Warning 34, NWS Tucson, AZ

September 6, 2002Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 6, 2002, 2:46 PM MST for Pima County, Arizona. It was in force for 119 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
Sep 6, 2002, 2:46 PM MST (21:46 UTC)
Expired
Sep 6, 2002, 4:45 PM MST
In force
119 min
Issued by
NWS Tucson, AZ
Area
Counties, with a storm outline in the text

County Pima County, AZ

The radar

The Tucson radar (KEMX), 69 km from the middle of the area, began a volume at 21:49 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, 9.8 hours before the alert went out and 33 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 2002-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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 2002-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
53 J/kg
Mixed-layer CIN
-327 J/kg
Mixed-layer LCL
2441 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
10 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 062146 CCA
FFWTWC
AZC019-062345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTION 
NATIONAL WEATHER SERVICE TUCSON AZ
241 PM MST FRI SEP 6 2002

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL PIMA COUNTY IN ARIZONA
    THIS INCLUDES AVRA VALLEY AND FAR SOUTHWEST MARANA

* UNTIL 445 PM MST

* AT 240 PM MST...SEVERE WEATHER SPOTTERS REPORTED THUNDERSTORMS     
  WITH VERY HEAVY RAIN NEAR THREE POINTS...OR ABOUT 20 MILES
  SOUTHWEST OF TUCSON...MOVING NORTH AT 15 MPH.

RADAR ESTIMATES THAT UP TO 2 INCHES OF RAIN PER HOUR CAN BE EXPECTED 
ON THE WEST SIDE OF THE TUCSON MOUNTAINS. SMALL STREAMS...SECONDARY 
ROADS...AND NORMALLY DRY WASHES WILL FLOOD QUICKLY. DO NOT DRIVE 
INTO FLOODED AREAS. MOVE TO HIGHER GROUND.

THIS EXTENDS THE PREVIOUS FLASH FLOOD WARING FOR THIS AREA. AT 240 
PM...A SPOTTER NEAR RYAN FIELD REPORTED THAT VALENCIA ROAD WAS 
IMPASSIBLE NEAR THE INTERSECTION OF HIGHWAY 86.

LAT...LON 3210 11138 3205 11118 3241 11102 3248 11127

PYTLAK

$$
CORRECTED TYPOS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 1:41 PM MSTFlash Flood WarningTWCPima
Sep 6, 1:41 PM MSTFlash Flood WarningTWCPima
Sep 6, 2:41 PM MSTFlash Flood WarningTWCPima64 min
Sep 6, 2:42 PM MSTFlash Flood WarningTWCPima2 hr
Sep 6, 3:37 PM MSTFlash Flood WarningTWCPima113 min
Sep 6, 3:38 PM MSTFlash Flood WarningTWCPima52 min
Sep 6, 4:13 PM MSTFlash Flood WarningTWCPima2 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; radar from the NEXRAD Level II archive.