Alert archive / Arizona / Flash Flood Warnings in 2002

Flash Flood Warning 40, NWS Tucson, AZ

September 8, 2002Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 8, 2002, 1:20 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
Sep 8, 2002, 1:20 PM MST (20:20 UTC)
Expired
Sep 8, 2002, 2:15 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 radar

The Tucson radar (KEMX), 28 km from the middle of the area, began a volume at 20:23 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, 8.3 hours before the alert went out and 24 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 2002-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 885 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 2002-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.193958Sfc1 km3 km6 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
885 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
1039 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

000 
WGUS55 KTWC 082020
FFWTWC
AZC019-082115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
118 PM MST SUN SEP 8 2002

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL PIMA COUNTY IN ARIZONA

* UNTIL 215 PM MST

* AT 112 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN OVER SAHUARITA...OR ABOUT 9 MILES NORTHEAST OF GREEN VALLEY...
  MOVING NORTHEAST AT 10 MPH.

MOTORISTS SHOULD USE CAUTION OF NORMALLY DRY WASHES AND LOW LYING 
DIPS IN THE ROADS. NEVER DRIVE INTO A FLOODED AREA OR DRIVE AROUND A 
BARRICADE. 

LAT...LON 3191 11109 3178 11078 3202 11065 3216 11100

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 6:00 PM MSTFlash Flood WarningTWCCochise
Sep 7, 7:05 PM MSTFlash Flood WarningTWCPima55 min
Sep 7, 7:07 PM MSTFlash Flood WarningTWCPima113 min
Sep 8, 1:18 PM MSTFlash Flood WarningTWCPima
Sep 8, 2:15 PM MSTFlash Flood WarningTWCPima60 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.