Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 54, NWS Phoenix, AZ

August 30, 2000Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 30, 2000, 3:28 PM MST for Maricopa County, Arizona. It was in force for 62 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 30, 2000, 3:28 PM MST (22:28 UTC)
Expired: Aug 30, 2000, 4:30 PM MST
In force: 62 min
Issued by: NWS Phoenix, AZ
Area: Whole counties

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 22:32 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 30, 11:30 AM MST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 10.5 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: 504 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1384 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KPSR 302226
SVRPHX
AZC013-302330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
328 PM MST WED AUG 30 2000

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

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

* UNTIL 430 PM MST

* AT 323 PM...SPOTTERS INDICATED A SEVERE THUNDERSTORM OVER EAST
  MESA...MOVING WEST AT 10 MPH.  ONE INCH HAIL WAS REPORTED AT
  VAL VISTA AND WARNER.

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

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

&
$$
MBZ

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 30, 2:40 PM MST, 48 minutes earlier.

Area forecast discussion, Aug 30, 2:40 PM MST, 48 minutes before

AZZ020>028-CAZ030>033-310545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
240 PM MST WED AUG 30 2000

.SYNOPSIS...
A MOIST AIRMASS WILL REMAIN IN PLACE FOR ABOUT ONE MORE DAY BEFORE A
SIGNIFICANT UPPER LEVEL LOW PRESSURE AREA OFF THE CALIFORNIA COAST
IMPORTS MUCH DRIER AIR INTO THE DESERT SOUTHWEST BY THE END OF THE
WEEK. UNTIL THEN...YOU CAN STILL EXPECT ISOLATED AFTERNOON AND
EVENING THUNDERSTORMS OVER SOUTH CENTRAL ARIZONA ON THURSDAY. THE
LABOR DAY WEEKEND IS SHAPING UP TO BE MOSTLY SUNNY WITH NEAR NORMAL
TEMPERATURES ALONG WITH SOME AFTERNOON BREEZINESS.

.DISCUSSION...
SEVERE THUNDERSTORM WATCH SEEMS TO BE WORKING OUT WELL...ESPECIALLY
TO THE S AND E OF PHX METRO AREA. SEEMS LIKE SOME LOWER DEWPOINTS AND
SOMEWHAT MORE STABLE AIR HAS PUSHED INTO MUCH OF THE GREATER PHX AREA
THIS AFTERNOON. VISIBLE IMAGERY SHOWS NICE...LARGE OUTFLOW BOUNDARY
THAT WAS GENERATED BY CONVECTION ALONG MEXICAN BORDER INTERSECTING
WITH OTHER STORM OUTFLOWS AND PRODUCING NEW STORM DEVELOPMENT...AGAIN
MAINLY E AND S OF PHX. SOME TRAINING APPEARS TO BE HAPPENING AND
RESULTING IN ISOLATED 1 TO 2 INCH DOPPLER ESTIMATED RAINFALLS. ALSO
...GOOD DUST STORM WAS GENERATED TO SE OF PHX NEAR CASA GRANDE/
COOLIDGE AREA. NEW 18Z MESO-ETA SHOWING MAIN EFFECTS OF VORT MAX WILL
STAY OVER OUR ERN CWFA THIS EVENING...WITH NVA TONIGHT AND THUNDER-
STORM GENERATED LOW LEVEL STABLIZATION CUTTING OFF STORMS PRETTY
EARLY. MEANWHILE...THURSDAY IS SHAPING UP TO BE A RELATIVELY QUIET
DAY...WITH NO GOOD TRIGGER FORESEEN. HOWEVER...SLIGHT UPPER DIFFLUENT
FLOW COMBINED WITH CONTINUED MOIST LOWER LEVELS MAY RESULT IN ISOLD
REDEVELOPMENT TOMORROW AFTERNOON...MAINLY MARICOPA COUNTY EWD. BY
FRIDAY...MODELS STILL ADVERTIZING INCREASING SWLY FLOW ALOFT WHICH
WILL LIKELY MIX MUCH DRIER AIR TO THE SURFACE. WILL TALK ABOUT LOWER
HUMIDITIES MOST AREAS BY THEN. SHOULD ALSO BE SOME BREEZY TO LOCALLY
WINDY CONDITIONS...MAINLY HIGHER TERRAIN. THE HOLIDAY WEEKEND IS
SHAPING UP TO BE QUIET WITH OUR FIRST BREAK IN THE MONSOON AS STRONG
SWLY FLOW ALOFT PERSISTS. IN FACT...THIS BREAK LIKELY TO LAST AT
LEAST ALL OF NEXT WEEK.   ESTLE

In the hours before

Special weather statement, Aug 30, 10:20 AM MST, 5 hours 8 minutes before

AZZ022>024-027-028-310130-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
1020 AM MST WED AUG 30 2000

...MODERATE RISK OF HAZARDOUS WEATHER OVER SOUTH CENTRAL ARIZONA
THIS AFTERNOON AND EARLY EVENING...

COUNTIES IN THE RISK AREA INCLUDE:
     IN ARIZONA...MARICOPA...SOUTHERN GILA AND NORTHWEST PINAL.

THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE:
     THUNDERSTORM WIND GUSTS OF GREATER THAN 60 MPH ALONG WITH
     LARGE HAIL.

ADDITIONAL THREATS INCLUDE:
     HEAVY RAINFALL OF OVER ONE INCH PER HOUR MAY CAUSE FLOODED
     HIGHWAY LOW SPOTS AND URBAN INTERSECTIONS.

STORM SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY.

ESTLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 2:03 PM MST	Severe Thunderstorm Warning	PSR	Pinal	62 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; radar from the NEXRAD Level II archive.