Alert archive / Arizona / Flash Flood Warnings in 2001

Flash Flood Warning 12, NWS Tucson, AZ

July 21, 2001Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 21, 2001, 1:15 PM MST for Pima County, Arizona. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 21, 2001, 1:15 PM MST (20:15 UTC)
Expired
Jul 21, 2001, 2:15 PM MST
In force
60 min
Issued by
NWS Tucson, AZ
Area
Whole counties

County Pima County, AZ

The radar

The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 20:16 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 84 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 2001-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 359 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 2001-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
359 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1572 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
2 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 212018
FFWTWC
AZC019-212215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
115 PM MST SAT JUL 21 2001

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 315 PM MST

* AT 110 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
RAIN FROM STRONG THUNDERSTORMS OVER EXTREME SOUTH CENTRAL PIMA
COUNTY. THIS AREA OF HEAVY RAINFALL IS GENERALLY IN THE AREA INCLUDES
ARIVACA ROAD AND THE TOWN OF ARIVACA. THIS AREA WAS HIT HARD
YESTERDAY WITH UP TO TWO TO THREE INCHES OF RAIN WITH UP TO TWO MORE
INCHES LIKELY FROM THESE STORMS TODAY. THESE STORMS ARE SHOWING A
SLIGHT NORTHEAST MOVEMENT.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN
DEPTH BY FOOT OR BY AUTOMOBILE.

LAT...LON 3159 11152 3155 11117 3176 11117 3189 11132

Nearby

Flash Flood Warnings in Arizona, 2001Every flash flood warning in 2001

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.