Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 31, NWS Phoenix, AZ

August 6, 2000Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 6, 2000, 6:43 PM MST for Maricopa County, Arizona. It was in force for 47 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 6, 2000, 6:43 PM MST (01:43 UTC)
Expired: Aug 6, 2000, 7:30 PM MST
In force: 47 min
Issued by: NWS Phoenix, AZ
Area: Whole counties

County Maricopa County, AZ

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 1.7 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 368 J/kg
Mixed-layer CIN: -214 J/kg
Mixed-layer LCL: 2681 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 30 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 
WUUS55 KPSR 070142
SVRPHX
AZC013-070230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
643 PM MST SUN AUG 6 2000

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

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

* UNTIL 730 PM MST...

* AT 442 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  SEVERE THUNDERSTORMS 10 MILES NORTHEAST OF LAKE PLEASANT...MOVING
  SOUTHWEST AT 12 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT THE FOLLOWING AREAS...
    THE TOWN OF NEW RIVER
    LAKE PLEASANT AND VICINITY

THESE ARE DANGEROUS STORMS CAPABLE OF PRODUCING DAMAGING WINDS AND
LARGE HAIL. GO INSIaDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS!
BOATERS ON LAKE PLEASANT SHOULD HEAD TO SHORE IMMEDIATELY.

HV

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 6, 2:50 PM MST, 3 hours 53 minutes earlier.

Area forecast discussion, Aug 6, 2:50 PM MST, 3 hours 53 minutes before

AZZ020>028-CAZ030>033-070545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
250 PM MST SUN AUG 6 2000

.SYNOPSIS...
THE CHANCE FOR MAINLY LATE AFTERNOON AND NIGHTTIME STORMS WILL
CONTINUE OVER SOUTH CENTRAL ARIZONA INTO AT LEAST THE MIDDLE OF NEXT
WEEK AS A MORE TYPICAL MONSOON FLOW BECOMES ESTABLISHED. IN
ADDITION...SOUTHWEST ARIZONA WILL SEE A SLIGHT CHANCE FOR STORMS
THROUGH MID WEEK. DAYTIME HIGH TEMPERATURES WILL RANGE FROM A BIT
BELOW TO SLIGHTLY ABOVE SEASONAL NORMALS.

.DISCUSSION...
CONVECTION NOW BREAKING OUT NICELY ALONG THE MOGOLLON RIM TO THE N
AND E OF THE CWA...AND THE STEERING FLOW ALOFT IS WEAKLY FROM THE
NE...WHICH IS SOMEWHAT FAVORABLE FOR HELPING STEER THE STORMS DOWN
OFF THE HIGHER TRRN INTO THE SCNTRL DESERTS. MOISTURE REMAINS HIGH
OVER THE DESERTS...WITH DEWPOINTS IN THE 60S...SO STORMS COMING OFF
THE MOUNTAINS ARE MOVING INTO A MORE FAVORABLE ENVIRONMENT AND SHOULD
BE ABLE TO SUSTAIN THEMSELVES. ALSO..OUTFLOWS FROM THESE STORMS
SHOULD BE ABLE TO TRIGGER NEW CONVECTION OVER THE DESERTS. ONLY FLY
IN THE OINTMENT IS THAT THE BOUNDARY LAYER IS 5 TO 10 DEGREES COOLER
COMPARED TO YESTERDAY...THE RESULT OF PREVIOUS CONVECTION. AS AS
RESULT...STORMS HAVE YET TO GET GOING OVER THE SE OR SCNTRL..AND THIS
LACK OF HEATING MAY CAUSE THE NIGHT TO BE A DUD. STILL...CALLING FOR
A CHANCE FOR NIGHTTIME STORMS OVER SCNTRL AZ...WITH A SLIGHT CHANCE
TO THE CO RIVER. PROGS GRADUALLY SHIFT THE  HIGH EWD TOMORROW...WITH
THE FLOW ALOFT BECOMING WEAKER...BUT THE DEFORMATION ZONE STAYS MORE
OR LESS IN PLACE WITH CONSIDERABLE MOISTURE SLATED TO BE OVER THE
SERN PART OF THE STATE...AND OVER THE ERN CWA. MESOETA BRINGS
IMPRESSIVE VORT MAX FROM NM INTO SERN AND SCNTRL AZ MON AND THIS
COULD LEAD TO AN UNSETTLED...SHOWERY DAY MON. TROFFING STILL FORECAST
TO SET UP ALONG THE WEST COAST BY TUE...WHICH WILL SHIFT THE HIGH
BACK NEAR THE FOUR CORNERS...AND KEEP THE FAR WRN PARTS OF THE CWA
DRY AND STABLE ENOUGH TO PRECLUDE ANY STORM DEVELOPMENT...WITH THE
CHANCES FOR STORMS CONFINED TO THE WRN DESERTS AND THE SCNTRL. WITH A
MORE TYPICAL MONSOON FLOW PATTERN IN PLACE...IN THE WED THRU FRI TIME
PERIOD...WILL CALL FOR THE STANDARD MONSOON FORECAST WHICH IS A
CHANCE FOR AFTN AND EVE SHOWERS AND THUNDERSTORMS...MAINLY FOR THE
SCNTRL. 11

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 5:07 PM MST	Severe Thunderstorm Warning	PSR	Gila	63 min
Aug 6, 5:45 PM MST	Flash Flood Warning	PSR	Gila	60 min
Aug 7, 4:26 PM MST	Severe Thunderstorm Warning	PSR	Gila	74 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2000 Every 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.