Alert archive / California / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 51, NWS Phoenix, AZ

August 24, 2000Imperial County, California

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 24, 2000, 3:30 PM PDT for Imperial County, California. It was in force for 60 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 24, 2000, 3:30 PM PDT (22:30 UTC)
Expired
Aug 24, 2000, 4:30 PM PDT
In force
60 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Imperial County, CA

The radar

The Yuma radar (KYUX), 90 km from the middle of the area, began a volume at 22:29 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

Yuma Intl Airpor, AZ (KYUM), launched 12:00Z, 10.5 hours before the alert went out and 84 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, Yuma Intl Airpor, AZ at 12:00Z on 2000-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 906 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, Yuma Intl Airpor, AZ at 12:00Z on 2000-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
906 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
1657 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
21 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.

358 
WUUS55 KPSR 242322
SVRPHX
CAC025-242330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
330 PM MST (330 PM PDT) THU AUG 24 2000

TEST...TEST...TEST.

$$

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 24, 2:55 PM PDT, 35 minutes earlier.

Area forecast discussion, Aug 24, 2:55 PM PDT, 35 minutes before
AZZ020>028-CAZ030>033-250545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
255 PM MST THU AUG 24 2000

.SYNOPSIS...
HIGH PRESSURE ALOFT IS EXPECTED TO CONTINUE CENTERED AROUND COLORADO
AND OKLAHOMA THE REST OF THE WEEK AND EARLY NEXT WEEK. THIS WILL
CONTINUE A MOIST FLOW OF AIR FROM THE SOUTHEAST OVER ARIZONA AND
SOUTHEAST CALIFORNIA. A LOW PRESSURE SYSTEM IN THIS FLOW IS EXPECTED
TO HELP ENHANCE THUNDERSTORMS WITH LOCALLY HEAVY RAIN OVER PORTIONS
OF SOUTHEAST CALIFORNIA INTO THIS EVENING. ANOTHER LOW PRESSURE
SYSTEM IS EXPECTED TO ENHANCE THUNDERSTORMS OVER SOUTH-CENTRAL
ARIZONA LATE TONIGHT THROUGH FRIDAY NIGHT.

.DISCUSSION...
THE GENERAL FLOW ALOFT FROM THE SOUTHEAST WITH MOIST AND UNSTABLE AIR
CONTINUES OVER ARIZONA AND SOUTHEAST CALIFORNIA. A LOW PRESSURE
SYSTEM IN THIS FLOW HAS ENHANCED THUNDERSTORMS WITH SOME HEAVY RAIN
IN PORTIONS OF SOUTHEAST CALIFORNIA WHICH IS EXPECTED TO CONTINUE
INTO THIS EVENING. FLASH FLOODING WAS REPORTED IN JOSHUA TREE
NATIONAL PARK THIS AFTERNOON. A HAZARDOUS WEATHER OUTLOOK WAS ISSUED
A FEW HOURS BEFORE THIS EVENT EMPHASIZING FLOODING OF NORMALLY DRY
CREEKS AND WASHES IN SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA THIS
AFTERNOON AND EVENING. THE NEXT SYSTEM FROM NORTHERN MEXICO AND FAR
SOUTHWEST TEXAS NEAR EL PASO IS EXPECTED TO AFFECT SOUTH-CENTRAL
ARIZONA LATE TONIGHT CONTINUING WITH ENHANCEMENT OF SHOWERS AND
THUNDERSTORMS THROUGH FRIDAY NIGHT WHICH IS COVERED IN THE FORECAST.
CONTINUING SIMILAR BROAD BRUSH EXTENDED FORECAST SUNDAY THROUGH
TUESDAY AS MORE MOISTURE FROM MEXICO MOVES INTO THE SOUTHWESTERN U.S.

ELLIS

In the hours before

Special weather statement, Aug 24, 11:10 AM PDT, 4 hours 20 minutes before
AZZ020-021-025-026-CAZ030>033-242345-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
1111 AM MST (1111 AM PDT) THU AUG 24 2000

...SLIGHT RISK OF HAZARDOUS WEATHER OVER SOUTHWEST ARIZONA AND
EXTREME SOUTHEAST CALIFORNIA...

...COUNTIES IN THE RISK AREA INCLUDE...
    IN ARIZONA...LA PAZ AND YUMA.
    IN CALIFORNIA...IMPERIAL AND EASTERN RIVERSIDE.

...THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE...
    HEAVY RAIN THAT THE COULD CAUSE FLOODING OF NORMALLY DRY
    CREEKS AND WASHES.

...ADDITIONAL THREATS INCLUDE...
    THUNDERSTORMS PRODUCING WIND GUSTS IN EXCESS OF 60 MPH.
    BLOWING DUST WHICH COULD REDUCE VISIBILITY TO LESS THAN
    ONE QUARTER MIL>E.

STORM SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY.

AH
Special weather statement, Aug 24, 1:20 PM PDT, 2 hours 10 minutes before
AZZ020>028-CAZ030>033-250215-

HAZARDOUS WEATHER OUTLOOK...UPDATED...
NATIONAL WEATHER SERVICE PHOENIX AZ
121 PM MST (121 PM PDT) THU AUG 24 2000

...SLIGHT RISK OF HAZARDOUS WEATHER OVER SOUTH CENTRAL AND
SOUTHWEST ARIZONA...AND EXTREME SOUTHEAST CALIFORNIA THIS AFTERNOON
AND TONIGHT...

COUNTIES IN THE RISK AREA INCLUDE:
    IN ARIZONA...MARICOPA...SOUTHERN GILA...NORTHWEST PINAL...
    LA PAZ...AND YUMA.
    IN CALIFORNIA...IMPERIAL AND EASTERN RIVERSIDE.

THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE:
    THUNDERSTORMS PRODUCING WIND GUSTS IN EXCESS OF 60 MPH.
    BLOWING DUST REDUCING VISIBILITY TO LESS THAN ONE QUARTER MILE.
    HEAVY RAIN THAT COULD CAUSE FLOODING zOF STREETS AND NORMALLY
    DRY CREEKS AND WASHES.

STORM SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY.

MB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 2:34 PM PDTFlash Flood WarningPSRRiverside56 min

Nearby

Severe Thunderstorm Warnings in California, 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.