Alert archive / Arizona / Flash Flood Warnings in 1999

Flash Flood Warning 3, NWS Phoenix, AZ

July 14, 1999Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 14, 1999, 4:07 PM MST for Maricopa County, Arizona. It was in force for 93 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 14, 1999, 4:07 PM MST (23:07 UTC)
Expired
Jul 14, 1999, 5:40 PM MST
In force
93 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 11.1 hours before the alert went out and 49 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 1999-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 513 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 1999-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
513 J/kg
Mixed-layer CIN
-153 J/kg
Mixed-layer LCL
1695 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHX 142307
FFWPHX
AZC013-150040-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
407 PM MST WED JUL 14 1999

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA

* UNTIL 540 PM MST

* AT 405 PM MST... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH VERY HEAVY RAIN CENTRAL AND EASTERN GREATER
  PHOENIX AREA... MOVING EAST AT 20 MPH.

* INDIAN BEND WASH IS PARTICULARLY PRONE TO FLASH FLOODING
  WITH THESE STORMS.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

CRAIG ELLIS

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 Jul 14, 2:45 PM MST, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 14, 2:45 PM MST, 1 hour 22 minutes before
SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
245 PM MST WED JUL 14 1999

.SYNOPSIS...
A MOIST AIRMASS IS MOVING SLOWLY EAST ACROSS SOUTH CENTRAL AZ
TONIGHT. A BROAD TROUGH OF LOW PRESSURE MOVES TO THE EAST TONIGHT
TRIGGERING SCATTERED THUNDERSTORMS WITH HEAVY RAINFALL IN SOUTH
CENTRAL AZ.  A SOUTHWEST FLOW ALOFT ON THURSDAY WILL BRING SLIGHTLY
DRIER AIR INTO THE SOUTHWEST AND SOUTH CENTRAL AREA.  CHANCE OF
AFTERNOON THUNDERTORMS CONTINUES MAINLY TO THE EAST ON FRIDAY AND
INTO THE WEEKEND.

.DISCUSSION...
DEEP CONVECTION OVER SOUTH CENTRAL MIDDAY TODAY HAS TEMPORAIRLY
DIMINISHIED THUNDERTORMS LATE THIS AFTERNOON.  HOWEVER THE STRONG
THUNDERSTORMS SHOULD RETURN THIS EVENING...TRIGGERING ON THE OLD
OUTFLOW BOUNDAIRIES FROM THE PREVIOUS STORMS...A MOVE NORTHEAST
ACROSS THE SAME AREAS THAT HAD RAINS EARLIER TODAY.  THE SUBTLE AXIS
OF A BROAD TROUGH ALOFT SHOULD SWING TO THE EAST OF SOUTH CENTRAL AZ
BY 06Z TONIGHT.  AFTER THE AXIS PASSAGE CNVCTV ACTIVITY SHOULD DMSH.
A WEAK RDIGE FOLLOWS...INTO OUR AREA ON THURSDAY...THEN A E PAC
TROUGH DEEPENS SW OF SRN CA...ON FRIDAY BRINGING A BETTER DEFINED
SOUTHWEST FLOW INTO THE AREA.  THE E PAC TROUGH SHD BE THE DOMINATE
FEATURE THOUGH THE WEEKEND. PERHAPS HEARLDING A SLIGHTLY DRIER CLIME
IN THE SOUTHWEST REGION OF OUR AREA GOING INTO EARLY NEXT WEEK.

IN THE MEANTIME...A FLASH FLOOD WATCH WILL BE IN EFFECT UNTIL 11 PM
MST FOR CENTRAL AZ...MARICOPA...SOUTHERN GILA...AND NORTHWEST PINAL
COUNTY.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 7:03 PM MSTFlash Flood WarningPSRMaricopa3 hr
Jul 14, 1:23 PM MSTSevere Thunderstorm WarningPSRGila62 min
Jul 14, 3:25 PM MSTSevere Thunderstorm WarningPSRMaricopa60 min
Jul 14, 3:47 PM MSTSevere Thunderstorm WarningPSRMaricopa48 min
Jul 14, 4:24 PM MSTSevere Thunderstorm WarningPSRPinal46 min
Jul 14, 4:38 PM MSTSevere Thunderstorm WarningPSRMaricopa37 min

Nearby

Flash Flood Warnings in Arizona, 1999Every flash flood warning in 1999

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.