Alert archive / Arizona / Flash Flood Warnings in 2002

Flash Flood Warning 2, NWS Tucson, AZ

July 21, 2002Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 21, 2002, 1:55 PM MST for Cochise County, Arizona. It was in force for 110 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
Jul 21, 2002, 1:55 PM MST (20:55 UTC)
Expired
Jul 21, 2002, 3:45 PM MST
In force
110 min
Issued by
NWS Tucson, AZ
Area
Counties, with a storm outline in the text

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 115 km from the middle of the area, began a volume at 20:56 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

Tuscon, AZ (KTUS), launched 12:00Z, 8.9 hours before the alert went out and 146 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 2002-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 453 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 2002-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
453 J/kg
Mixed-layer CIN
-120 J/kg
Mixed-layer LCL
1758 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
WGUS55 KTWC 212055
FFWTWC
AZC003-212245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
154 PM MST SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 345 PM MST

* AT 146 PM MST...SEVERE WEATHER SPOTTERS REPORTED AND RADAR ESTIMATES 
  INDICATED OVER 4 INCHES OF RAIN HAS FALLEN ACROSS RUCKER CANYON...OR 
  ABOUT 31 MILES NORTH OF DOUGLAS...MOVING WEST 5 MPH.

ALTHOUGH THE HEAVY RAINFALL CONTINUES TO LESSEN...RUNOFF FORM THESE 
ARE CAUSING FLASH FLOODING. CAMPERS AND HIKERS ALONG CREEKS AND IN 
CANYONS NEED TO MOVE TO HIGH GROUND IN ORDER TO ESCAPE THE FLOOD WATERS.

LAT...LON 3168 10951 3168 10929 3189 10929 3191 10952

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 1:54 PM MSTFlash Flood WarningTWCCochise51 min
Jul 21, 2:12 PM MSTSevere Thunderstorm WarningTWCGreenlee63 min
Jul 21, 3:16 PM MSTSevere Thunderstorm WarningTWCGraham, Greenlee29 min
Jul 21, 4:38 PM MSTSevere Thunderstorm WarningTWCCochise37 min
Jul 21, 4:41 PM MSTSevere Thunderstorm WarningTWCCochise34 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.