Alert archive / Arizona / Flash Flood Warnings in 2001
Flash Flood Warning 11, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 19, 2001, 2:49 PM MST for Gila County, Arizona. It was in force for . No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 19, 2001, 2:49 PM MST (21:49 UTC)
- Expired
- Aug 19, 2001, 2:45 PM MST
- In force
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Gila County, AZ
The radar
The Phoenix radar (KIWA), 90 km from the middle of the area, began a volume at 21:50 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, 9.8 hours before the alert went out and 118 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.
- Mixed-layer CAPE
- 748 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 2037 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KPSR 192151 FFWPHX AZC007-192245- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 249 PM MST SUN AUG 19 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA * UNTIL 345 PM MST * AT 245 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS PRODUCING VERY HEAVY RAIN 5 MILES SOUTHEAST OF GLOBE. THE AREA OF HEAVY RAIN WAS NEARLY STATIONARY. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS AND STREAMS AND WASHES...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS...ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN PHOENIX. LAT...LON 3336 11087 3318 11078 3328 11044 3352 11057
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 19, 2:45 PM MST, 4 minutes earlier.
Area forecast discussion, Aug 19, 2:45 PM MST, 4 minutes before
AZZ020>028-CAZ030>033-200545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST SUN AUG 19 2001 .SYNOPSIS... SOUTHWEST AND SOUTH-CENTRAL ARIZONA...AS WELL AS FAR SOUTHEAST CALIFORNIA WILL UNDERGO A TRANSITION FROM THE CURRENT MOIST SOUTHEAST FLOW OF AIR TO A MUCH DRIER SOUTHWEST FLOW ALOFT BY MIDWEEK. THIS WILL RESULT IN AN END TO THUNDERSTORMS FOR A FEW DAYS...ALONG WITH NOTICEABLY LOWER RELATIVE HUMIDITIES AND COOLER NIGHTTIMES. HOWEVER...BEFORE THIS CHANGE IN AIRMASS OCCURS...THERE WILL CONTINUE TO BE A CHANCE OF SHOWERS AND THUNDERSTORMS MOST LOCATIONS TONIGHT INTO MONDAY NIGHT...AND THEN ANOTHER CHANCE TUESDAY IN SOUTH-CENTRAL ARIZONA. SOME OF THE STORMS COULD BE STRONG...WITH BLOWING DUST AND LOCALLY HEAVY RAIN. .DISCUSSION... APPEARS INGREDIENTS MENTIONED IN MORNING DISCUSSION ARE COMING TOGETHER FOR THE MOST PART. STRONG CONVECTION HAS FORMED IN AFTERNOON HEATING ALONG THE RIM AND AREAS E OF PHX...WITH LITTLE MOTION INDICATED. THEREFORE...AM MORE CONCERNED WITH HEAVY RAIN THREAT THAN SEVERE AT THE MOMENT. HOWEVER...THERE IS DECENT SHEAR ON THE KIWA VWP...SO THIS...ALONG WITH LARGE SUBCLOUD DP DEPRESSIONS COULD EVENTUALLY SPELL TROUBLE WITH MICROBURST THREAT ON THE LOWER DESERTS THIS EVENING. MEANWHILE...DYNAMICS APPEAR TO STILL BE IN PLACE FOR CONTINUED STORM DEVELOPMENT JUST ABOUT ANYWHERE IN CWFA TONIGHT...EVEN SE CA WHERE STRONG VORT MAX IS FORECAST TO MOVE THRU TONIGHT. AS INDICATED IN MORNING DISCUSSION...WILL GO ABOVE BOTH AVN/NGM MOS POPS TONIGHT. DEBRIS CLOUDS SHOULD ABOUND TOMORROW...BUT THERE STILL SHOULD BE SOME DYNAMICS WITH REMNANTS OF NWD MOVING SHEAR ZONE STILL IN AREA AND ANOTHER VORT TROF NUDGING IN FROM THE W. SO...WILL KEEP SLIGHT CHANCE POPS GOING MONDAY AND MON NIGHT. BY TUESDAY...ALL MODELS CONTINUE STRONG DRY ADVECTION TRENDS...WITH POSSIBLY ENOUGH LOW LEVEL MOISTURE LEFT ERN LA PAZ/YUMA COUNTIES EWD TO WARRANT A CONTINUED SLIGHT CHANCE OF STORMS ON TUE. IF STORMS DO FORM...THIS TRANSITION EVENT COULD TURN NASTY WITH SOME BECOMING SEVERE...STAY TUNED. DURING THE EXTENDED PERIOD...ALL MODELS AGREE THAT WE WILL HAVE A DRY WLY FLOW IN PLACE BY WED...CONTINUING THRU SUNDAY. SO...WILL CALL FOR SOME CLOUDS ERN PORTIONS ON WED...THEN MOSTLY CLEAR. ALSO...SURFACE RHS SHOULD BE NOTICEABLY LOWER BY MIDWEEK. LOWER HUMIDITIES WILL ALSO TRANSLATE INTO COOLER NIGHTS. ESTLE
In the hours before
Special weather statement, Aug 19, 1:30 PM MST, 1 hour 19 minutes before
AZZ020>028-CAZ030>033-200700-
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
130 PM MST SUN AUG 19 2001
...SCATTERED STRONG THUNDERSTORMS POSSIBLE OVER SOUTH-CENTRAL AND
SOUTHWEST ARIZONA...AS WELL AS FAR SOUTHEAST CALIFORNIA TONIGHT...
COUNTIES IN THE RISK AREA INCLUDE:
IN ARIZONA...MARICOPA...NORTHWEST PINAL...SOUTHERN GILA...
LA PAZ...AND YUMA.
IN CALIFORNIA...IMPERIAL AND EASTERN RIVERSIDE.
THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE:
STRONG MICROBURST WINDS...POSSIBLY PRODUCING DENSE BLOWING DUST
OR SAND IN THE LOWER DESERTS.
OTHER THREATS INCLUDE: DANGEROUS CLOUD-TO-GROUND LIGHTNING AND
LOCALLY HEAVY RAIN.
SPOTTER ACTIVATION MAY BE NECESSARY TONIGHT.
ESTLENearby
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.