Alert archive / Arizona / Flash Flood Warnings in 2002

Flash Flood Warning 50, NWS Tucson, AZ

September 10, 2002Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Sep 10, 2002, 2:57 PM MST for Pima County, Arizona. It was in force for 3 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 10, 2002, 2:57 PM MST (21:57 UTC)
Expired
Sep 10, 2002, 3:00 PM MST
In force
3 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), 29 km from the middle of the area, began a volume at 21:56 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

Phoenix, AZ (KPSR), launched 12:00Z, 10.0 hours before the alert went out and 183 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, Phoenix, AZ at 12:00Z on 2002-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 390 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, Phoenix, AZ at 12:00Z on 2002-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.19395878Sfc1 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
390 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
1356 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS55 KTWC 102158
FFWTWC
AZC019-102300-

BULLETIN - EAS ACTIVATION REQUESTED
COMBINED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
257 PM MST TUE SEP 10 2002

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* COMBINED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING FOR...
  EASTERN PIMA COUNTY IN ARIZONA
    THIS INCLUDES THE CITIES OF...TUCSON...ORO VALLEY...GREEN VALLEY

* SEVERE THUNDERSTORM WARNING UNTIL 400 PM MST
  FLASH FLOOD WARNING UNTIL 400 PM MST

* AT 255 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM WITH VERY HEAVY RAIN OVER CORONA DE TUCSON...OR ABOUT
  ABOUT 10 MILES SOUTHEAST OF TUCSON...MOVING NORTH AT 15 TO 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOUTHERN TO SOUTHEAST TUCSON AT 315 PM MST

THIS STORM WILL NOT ONLY PRODUCE DAMAGING WINDS AND HAIL....BUT ALSO
FLASH FLOODING OF ROADS AND NORMALLY DRY WASHES. MOVE INDOORS AND DO 
NOT DRIVE INTO FLOODED AREAS. MOTORISTS SHOULD BE PREPARED FOR NEAR 
ZERO VISIBILITIES IN WIND-DRIVEN DOWNPOURS.

LAT...LON 3179 11101 3183 11055 3250 11053 3250 11114

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 7:45 PM MSTFlash Flood WarningTWCCochise25 min
Sep 9, 7:46 PM MSTFlash Flood WarningTWCCochise84 min
Sep 10, 1:59 PM MSTFlash Flood WarningTWCPima1 min
Sep 10, 3:30 PM MSTSevere Thunderstorm WarningTWCSanta Cruz60 min
Sep 10, 4:00 PM MSTFlash Flood WarningTWCPima, Pinal

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.