Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 46, NWS Phoenix, AZ

August 17, 2000Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 17, 2000, 8:57 PM MST for Maricopa County, Arizona. It was in force for 63 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
Aug 17, 2000, 8:57 PM MST (03:57 UTC)
Expired
Aug 17, 2000, 10:00 PM MST
In force
63 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Maricopa County, AZ

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 17, 4:00 PM MSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 4.0 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 00:00Z on 2000-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 146 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, Phoenix, AZ at 00:00Z on 2000-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
146 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
2669 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
25 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.

261 
WUUS55 KPSR 180357
SVRPHX
AZC013-180500-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
857 PM MST THU AUG 17 2000

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA

* UNTIL 1000 PM MST

* AT 855 PM...SPOTTERS INDICATED A SEVERE THUNDERSTORM OVER MESA AND
  GILBERT...SHOWING LITTLE MOVEMENT.  POWER LINES WERE REPORTED DOWN
  NEAR GILBERT ROAD AND U.S. 60.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  MESA
  GILBERT
  CHANDLER

DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

$$
MB

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 17, 2:54 PM MST, 6 hours 3 minutes earlier.

Area forecast discussion, Aug 17, 2:54 PM MST, 6 hours 3 minutes before
AZZ020>028-CAZ030>033-180545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
245 AM MST THU AUG 17 2000

.SYNOPSIS...
LOW PRESSURE ALOFT OVER NORTHERN BAJA...COUPLED WITH REMNANTS OF OLD
TROPICAL STORM BERYL MOVING OVER SOUTHEAST ARIZONA...WILL RESULT IN
SHOWERS AND THUNDERSTORMS OVER MUCH OF SOUTHWEST AND SOUTH-CENTRAL
ARIZONA INTO THE WEEKEND...INCLUDING FAR SOUTHEAST CALIFORNIA FRIDAY
NIGHT. HEAVY RAINFALL WILL BE POSSIBLE WITH SOME STORMS AND A FLASH
FLOOD WATCH IS IN EFFECT FOR SOUTH-CENTRAL ARIZONA TONIGHT. AS THE
REMNANTS OF BERYL MOVE NORTH...CONDITIONS WILL IMPROVE OVER THE AREA
THIS WEEKEND...RETURNING TO A NORMAL MONSOON REGIME WITH CHANCES OF
AFTERNOON AND EVENING THUNDERSTORMS ON THE HIGHER TERRAIN OF SOUTH-
CENTRAL ARIZONA AND SLIGHT CHANCES ON THE DESERTS...WITH SOUTHEAST
CALIFORNIA STAYING MOSTLY CLEAR TO PARTLY CLOUDY.

.DISCUSSION...
SOME OF THE WHAT IS LEFT OF TS BERYL IS STILL HEADED THIS WAY...AND
LOW LEVEL MOISTURE HAS INCREASED ON THE DESERTS DUE TO GULF SURGE AND
OUTFLOW FROM STORMS LAST NIGHT AND EARLY THIS MORNING. 18Z SOUNDINGS
INDICATE P-WATER HAS INCREASED AGAIN...WITH AN INCH AND TWO-THIRDS AT
YUMA AND ALMOST AN INCH AND A HALF AT PHOENIX. FLASH FLOOD WATCH HAS
BEEN ISSUED FOR SOUTH-CENTRAL ARIZONA FOR TONIGHT...INCLUDING ALL OF
MARICOPA...NW PINAL AND SRN GILA COUNTIES AND COMMUNITIES THEREIN.
QPF ESTIMATED IN EXCESS OF AN INCH FOR MUCH OF THE SOUTH-CENTRAL AZ
REGION...WITH MOST OF IT EXPECTED OVERNIGHT. FOR CONTINUITY...WILL GO
ALONG WITH THE IDEA OF THE AVN AND KEEP A MENTION OF STORMS IN FAR SW
AZ AND FAR SE CA FOR FRI NIGHT...ALTHOUGH THE ETA IMPLIES OTHERWISE.
LOOKS LIKE THE MAIN EVENT...INVOLVING REMNANTS OF BERYL...WILL BE
OVER FRI NIGHT...WITH A RETURN TO GENERAL MONSOON WEATHER. HOWEVER...
MODELS INDICATE AT LEAST THE ERN HALF OF THE CWA WILL REMAIN IN AN
AREA OF DEFORMATION UNDER UPPER-LEVEL DIFLUENCE...AND STORMS WILL BE
DEVELOPING ON THE HIGHER TERRAIN AND DRIFTING OFF TO LOWER ELEVATIONS
IN THE EVENING AND STEERING FLOW WILL BE TOUGH TO CALL. THEREFORE...
A GENERAL CHANCE OF STORMS FOR ERN PORTIONS OF CWA FOR THE EXTENDED
PERIOD SHOULD SUFFICE.  WILT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 6:33 PM MSTFlash Flood WarningPSRMaricopa92 min
Aug 17, 6:41 PM MSTFlash Flood WarningPSRGila89 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2000Every severe thunderstorm warning in 2000

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.