Alert archive / Arizona / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 60, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 10, 2002, 1:51 PM MST for Yuma County, Arizona; Imperial County, California. It was in force for 54 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
- Sep 10, 2002, 1:51 PM MST (20:51 UTC)
- Expired
- Sep 10, 2002, 2:45 PM MST
- In force
- 54 min
- Issued by
- NWS Phoenix, AZ
- Area
- Counties, with a storm outline in the text
Counties Yuma County, AZ, Imperial County, CA
The radar
The Yuma radar (KYUX), 46 km from the middle of the area, began a volume at 20:52 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Yuma Intl Airpor, AZ (KYUM), launched 12:00Z, 8.9 hours before the alert went out and 28 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.
- Mixed-layer CAPE
- 366 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 1713 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Sep 10, 9:55 AM MST, 3 hours 56 minutes earlier.
Area forecast discussion, Sep 10, 9:55 AM MST, 3 hours 56 minutes before
AZZ020>028-CAZ030>033-102245- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 955 AM MST TUE SEP 10 2002 .SYNOPSIS... A LOW PRESSURE SYSTEM MOVING NORTHEAST FROM NORTHERN BAJA CALIFORNIA COMBINED WITH A MOIST UNSTABLE AIRMASS MEANS SCATTERED SHOWERS AND THUNDERSTORMS THROUGH THIS EVENING. THE LOW PRESSURE SYSTEM IS EXPECTED TO CONTINUE MOVING NORTHEAST AWAY FROM ARIZONA WEDNESDAY WITH GRADUALLY DRIER AIR MOVING IN THE FROM THE WEST. EVEN DRIER AIR FROM THE NORTH IS EXPECTED TO MOVE IN BY FRIDAY AND THIS WEEKEND. WITH LESS CLOUD COVER...WARMER WEATHER IS FORECAST TODAY. EVEN WARMER WEATHER IS FORECAST THROUGH THE END OF THE WEEK AND THIS WEEKEND AS HIGH PRESSURE ALOFT WEST OF BAJA CALIFORNIA EXPANDS NORTHEAST. .DISCUSSION... PLENTY OF MOIST AND UNSTABLE AIR CONTINUES OVER SOUTHEAST CALIFORNIA ...SOUTHWEST AND SOUTH-CENTRAL ARIZONA. TO GO ALONG WITH THIS...A WEAK LOW PRESSURE SYSTEM FROM NORTHERN BAJA CALIFORNIA IS MOVING NORTH-NORTHEAST. DYNAMICS WITH THIS SYSTEM COMBINED WITH A MOIST AND UNSTABLE AIRMASS IS EXPECTED TO RESULT IN THE DEVELOPMENT OF SCATTERED SHOWERS AND THUNDERSTORMS OVER SOUTHEAST CALIFORNIA... SOUTHWEST AND SOUTH-CENTRAL ARIZONA TODAY AND THIS EVENING. THERE IS PLENTY OF THERMODYNAMIC ENERGY AVAILABLE WITH HEATING COMBINED WITH MOMENTUM ALOFT FOR POSSIBILITY OF SEVERE THUNDERSTORMS. THE LOW PRESSURE SYSTEM WILL CONTINUE MOVING NORTHEAST AND AWAY FROM ARIZONA WEDNESDAY WITH GRADUALLY DRIER AIR MOVING IN FROM THE WEST. THIS WILL RESULT IN A DECREASING CHANCE OF SHOWERS AND THUNDERSTORMS ESPECIALLY FOR THE DESERT AREAS. EVEN DRIER AIR FROM THE NORTH IS EXPECTED TO MOVE IN BY FRIDAY AND THIS WEEKEND. WITH LESS CLOUD COVER...WARMER WEATHER IS FORECAST TODAY. EVEN WARMER WEATHER IS FORECAST THROUGH THE END OF THE WEEK AND THIS WEEKEND AS HIGH PRESSURE ALOFT WEST OF BAJA CALIFORNIA EXPANDS NORTHEAST. TEMPERATURES ARE EXPECTED TO RISE TO NEAR THE AVERAGE FOR MID SEPTEMBER BY THE LATTER PART OF THE WEEK AND ABOVE AVERAGE BY THIS WEEKEND. .PSR...NONE. ELLIS
In the hours before
Special weather statement, Sep 10, 10:30 AM MST, 3 hours 21 minutes before
AZZ020>028-CAZ031>033-110100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 1030 AM MST TUE SEP 10 2002 ...HAZARDOUS WEATHER IS POSSIBLE THIS AFTERNOON AND EVENING AS THUNDERSTORMS WITH GUSTY WINDS...HAIL...AND BRIEF HEAVY RAIN MAY DEVELOP... A LOW PRESSURE SYSTEM OVER THE NORTHERN BAJA PENINSULA IS EXPECTED TO TRIGGER THUNDERSTORMS BY MIDDAY TODAY. THESE THUNDERSTORMS ARE EXPECTED TO MOVE NORTH INTO SOUTHEAST CALIFORNIA AND FAR SOUTHWEST ARIZONA BETWEEN NOON AND 3 PM. THE THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE GUSTY WINDS GREATER THAN 30 MPH...HAIL...AND BRIEF BUT HEAVY RAIN. THEY ARE EXPECTED TO MOVE NORTH...OUT OF THE REGION BY 8 PM TONIGHT. A RISK OF VERY STRONG THUNDERSTORMS EXISTS FOR SOUTH CENTRAL ARIZONA BETWEEN 3 PM AND 9 PM THIS EVENING. THE COMBINATION OF AFTERNOON HEATING...ABUNDANT MOISTURE...HIGH SPEED WINDS ALOFT...AND THE APPROACHING BAJA LOW PRESSURE SYSTEM MAY CAUSE VERY STRONG THUNDERSTORMS TO HAVE GUSTY WINDS GREATER THAN 40 MPH...HAIL...AND BRIEF BUT HEAVY RAIN...ESPECIALLY OVER MARICOPA...NORTHERN PINAL AND SOUTHERN GILA COUNTIES. THIS AREA INCLUDES GILA BEND...THE PHOENIX METRO AREA...CASA GRANDE...SUPERIOR AND THE GLOBE/MIAMI AREA. STORM SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EVENING. RUNYAN
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 2:08 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 37 min |
| Sep 10, 2:17 PM MST | Severe Thunderstorm Warning | PSR | Gila | 58 min |
| Sep 10, 3:30 PM MST | Severe Thunderstorm Warning | PSR | Gila | 60 min |
| Sep 10, 3:19 PM MST | Severe Thunderstorm Warning | PSR | Imperial | 56 min |
| Sep 10, 4:15 PM MST | Severe Thunderstorm Warning | PSR | Imperial | 60 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2002Severe Thunderstorm Warnings in California, 2002Every severe thunderstorm warning in 2002
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.