Alert archive / Arizona / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 41, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 28, 2002, 6:48 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 57 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 28, 2002, 6:48 PM MST (01:48 UTC)
- Expired
- Aug 28, 2002, 7:45 PM MST
- In force
- 57 min
- Issued by
- NWS Phoenix, AZ
- Area
- Counties, with a storm outline in the text
Counties Maricopa County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 29 km from the middle of the area, began a volume at 01:51 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
Phoenix, AZ (KPSR), launched 00:00Z, 1.8 hours before the alert went out and 34 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
- 888 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 2880 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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 28, 3:55 PM MST, 2 hours 53 minutes earlier.
Area forecast discussion, Aug 28, 3:55 PM MST, 2 hours 53 minutes before
AZZ020>028-CAZ030>033-290545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 355 PM MST WED AUG 28 2002 .SYNOPSIS... LOW PRESSURE OVER NEVADA...AND HIGH PRESSURE OVER SONORA MEXICO HAS MADE FOR A PREDOMINATE SOUTHWEST WIND FLOW ALOFT...IN SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA...WHERE DRY WEATHER AND PLENTY OF SUNSHINE WILL PREVAIL FOR THE NEXT SEVERAL DAYS. A MOIST SOUTHERLY WIND IN SOUTH CENTRAL ARIZONA CONTINUES TO BRING MONSOON MOISTURE INTO EAST CENTRAL ARIZONA THAT SHOULD CONTINUE THE CHANCE FOR SHOWERS AND THUNDERSTORMS THROUGH THE HOLIDAY WEEKEND AND INTO NEXT WEEK. .DISCUSSION... THIS EVENING...JUST ENOUGH SHEAR...15 KTS TO 65 KTS BTWN LOW AND MID LVLS ALONG WITH MID LVL MOISTURE AND CAPE GREATER THAN 1500 J/KG EAST OF PHX AND SRN GILA COUNTY TO TRIGGER LATE AFTN STRONG CNVCTN. THIS ACTIVITY SHD CONT THROUGH THE EVENING HOURS. THE OVERALL PATTERN WILL NOT CHANGE MUCH OVER THE NEXT FEW DAYS...DRY TO THE WEST AND MODERATELY MOIST AND UNSTBL TO THE EAST...SO THE FCST IS BASICALLY PERSISTANCE. MAX AND MIN TEMPERATURES NEARLY STEADY THROUGH THE NEXT SEVEN DAYS...MODERATED SOMEWHAT DUE TO THE HIGHER HUMIDITY IN THE EASTERN PORTION OF THE CWA. RUNYAN .PSR...NONE.
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 5:07 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 53 min |
| Aug 28, 5:24 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 66 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 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.