Alert archive / Arizona / Flash Flood Warnings in 2002

Flash Flood Warning 29, NWS Tucson, AZ

August 18, 2002Santa Cruz County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 18, 2002, 3:25 PM MST for Santa Cruz County, Arizona. It was in force for 95 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 18, 2002, 3:25 PM MST (22:25 UTC)
Expired
Aug 18, 2002, 5:00 PM MST
In force
95 min
Issued by
NWS Tucson, AZ
Area
Counties, with a storm outline in the text

County Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 57 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 77 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 2002-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1010 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 2002-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -62 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
1010 J/kg
Mixed-layer CIN
-157 J/kg
Mixed-layer LCL
2013 m above ground
0-6 km bulk shear
1 kt
0-1 km storm-relative helicity
-62 m²/s²
0-3 km storm-relative helicity
-20 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 182225
FFWTWC
AZC023-190000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
325 PM MST SUN AUG 18 2002

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL SANTA CRUZ COUNTY IN ARIZONA
    THIS INCLUDES THE CITY OF NOGALES

* UNTIL 500 PM MST

* AT 322 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY 
  HEAVY FROM STRONG TO SEVERE THUNDERSTORMS ALONG INTERSTATE 19
  FROM TUBAC TO NOGALES. THE STORMS WERE MOVING SLOWLY SOUTH TO 
  WEST AT 5 TO 8 MPH.

LAT...LON 3134 11110 3135 11060 3172 11070 3172 11115
          3153 11115 3137 11115

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 3:16 PM MSTSevere Thunderstorm WarningTWCSanta Cruz29 min
Aug 18, 3:25 PM MSTFlash Flood WarningTWCSanta Cruz35 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.