Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 18, NWS Phoenix, AZ

July 21, 2000Gila County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 21, 2000, 4:34 PM MST for Gila County, Arizona. It was in force for 46 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 21, 2000, 4:34 PM MST (23:34 UTC)
Expired
Jul 21, 2000, 5:20 PM MST
In force
46 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 93 km from the middle of the area, began a volume at 23:33 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

Tuscon, AZ (KTUS), launched 12:00Z, 11.6 hours before the alert went out and 181 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, Tuscon, AZ at 12:00Z on 2000-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 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, Tuscon, AZ at 12:00Z on 2000-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -44 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
27 J/kg
Mixed-layer CIN
-487 J/kg
Mixed-layer LCL
3081 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-44 m²/s²
0-3 km storm-relative helicity
67 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.

239 
WUUS55 KPSR 212333
SVRPHX
AZC007-220020-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
434 PM MST FRI JUL 21 2000

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN GILA COUNTY IN CENTRAL ARIZONA

* UNTIL 520 PM MST

* AT 430 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 15 MILES NORTHEAST OF SAN CARLOS... MOVING
  SOUTHWEST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  OPEN COUNTRY EAST OF HIGHWAY 77 AND NORTHEAST OF SAN CARLOS

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

CB

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 Jul 21, 3:15 PM MST, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 21, 3:15 PM MST, 1 hour 19 minutes before
AZZ020>028-CAZ030>033-220545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
315 PM MST FRI JUL 21 2000

.SYNOPSIS...
MONSOON MOISTURE HAS RETURNED TO MUCH OF THE DESERT SOUTHWEST...FOR
MORE HUMID CONDITIONS. THIS WILL BRING A THREAT OF MAINLY AFTERNOON
AND EVENING THUNDERSTORMS...TO SOUTH-CENTRAL AND SOUTHWEST ARIZONA
THE NEXT SEVERAL DAYS. STRONG HIGH PRESSURE WILL ALSO BE IN PLACE
OVER THE SOUTHWEST FOR TEMPERATURES AT OR ABOVE NORMAL.

.DISCUSSION...
STORM ACTIVITY A LITTLE SLOW TO DEVELOP EXCEPT OVER THE RIM AND WHITE
MOUNTAINS...STRONG CAP TO OVERCOME. WITH SIGNIFICANT MOISTURE/CAPE IN
PLACE...STORM THREAT REMAINS FOR TONIGHT FROM LATE-DEVELOPING STORMS.
SURGE CONTINUES AND EXPECT THAT MOISTURE ADVECTION WILL BE PLENTIFUL
ENOUGH FOR AT LEAST NEXT 2 DAYS FOR STORM ACTIVITY. NOT CERTAIN ABOUT
HOW WIDESPREAD THE ACTIVITY WILL BE...THUS CONSERVATIVE WORDING IN
THE ZONES. THE GENERAL IDEA IS THAT THE MONSOON HAS RETURNED. ETA/NGM
HAS MUCH BETTER HANDLE ON MOISTURE FIELDS THAN AVN. THE 500 MB HIGH
HANGS AROUND OVER ARIZONA AND NEW MEXICO INTO WEDNESDAY...WITH
SOUTHWESTERLY FLOW TRYING TO NUDGE IN TUESDAY NIGHT AND WEDNESDAY.
INTRODUCED CHANCE WORDING IN THE EXTENDED FOR MOST OF THE ARIZONA
ZONES BECAUSE OF MOISTURE TRENDS AND LACK OF DISTINCT DRYING FLOW.

JAMISON

In the hours before

Special weather statement, Jul 21, 1:31 PM MST, 3 hours 3 minutes before
AZZ021>024-026>028-220130-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
131 PM MST FRI JUL 21 2000

...SLIGHT RISK FOR SEVERE THUNDERSTORMS AND BLOWING DUST OVER MUCH
OF SOUTHWEST AND SOUTH-CENTRAL ARIZONA THIS EVENING AND TONIGHT...

THE SLIGHT RISK AREA INCLUDES THE FOLLOWING COUNTIES...MARICOPA...
NORTHERN PINAL...CENTRAL AND EASTERN LA PAZ AND YUMA...AND SOUTHERN
GILA. CITIES AND RECREATIONAL AREAS THAT MAY BE AFFECTED INCLUDE THE
GREATER PHOENIX METROPOLITAN AREA...WICKENBURG...LAKE PLEASANT...
THE APACHE TRAIL...GILA BEND...CASA GRANDE...FLORENCE...COOLIDGE...
GLOBE...AND MIAMI.

SEVERE THUNDERSTORMS ARE POSSIBLE IN THE SLIGHT RISK AREA THIS
EVENING.  STORMS ARE MOST LIKELY OVER THE SOUTH CENTRAL DESERT...
INCLUDING THE GREATER PHOENIX METROPOLITAN AREA...BETWEEN 5 AND 10
PM...AND OVER CENTRAL AND EASTERN LA PAZ AND YUMA COUNTIES BETWEEN
7 AND 11 PM. THE GREATEST THREATS FROM THESE STORMS WILL BE DAMAGING
WIND AND BLOWING DUST WHICH REDUCES VISIBILITIES TO LESS THAN 1/4
MILE. LOCALLY HEAVY RAIN COULD RESULT IN RUNNING WASHES AND FLOODING
OF ROADWAYS.

STORM SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY.

DG

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; radar from the NEXRAD Level II archive.