Alert archive / Arizona / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 37, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 28, 2002, 2:41 PM MST for Pinal County, Arizona. It was in force for 64 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 28, 2002, 2:41 PM MST (21:41 UTC)
- Expired
- Aug 28, 2002, 3:45 PM MST
- In force
- 64 min
- Issued by
- NWS Phoenix, AZ
- Area
- Counties, with a storm outline in the text
County Pinal County, AZ
The radar
The Phoenix radar (KIWA), 46 km from the middle of the area, began a volume at 21:44 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 28, 3:15 PM MST | Hail 1.75 | Superior, AZ |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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 12:00Z, 9.7 hours before the alert went out and 77 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3615 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
192 WUUS55 KPSR 282141 SVRPSR AZC021-282245- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 239 PM MST WED AUG 28 2002 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 345 PM MST * AT 229 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 23 MILES SOUTHWEST OF SUPERIOR...OR ABOUT 8 MILES SOUTHEAST OF FLORENCE...MOVING NORTHEAST AT 20 MPH. THIS STORM WILL AFFECT MCFARLAND STATE PARK...ASHHURST-HAYDEN DAM BY 300 PM...AND SUPERIOR BY AROUND 330 PM. LARGE HAIL AND WIND GUSTS IN EXCESS OF 60 MPH ARE LIKLEY WITH THIS STORM. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN PHOENIX. LAT...LON 3296 11135 3325 11095 3340 11101 3339 11131
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, 9:15 AM MST, 5 hours 26 minutes earlier.
Area forecast discussion, Aug 28, 9:15 AM MST, 5 hours 26 minutes before
AZZ020>028-CAZ030>033-282245- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 915 AM MST WED AUG 28 2002 .SYNOPSIS... LOW PRESSURE OVER NEVADA...AND HIGH PRESSURE OVER SONORA MEXICO HAS CAUSED A 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 WILL ALLOW A RETURN OF MONSOON MOISTURE INTO EAST CENTRAL ARIZONA BY THURSDAY AND CONTINUE THROUGH THE HOLIDAY WEEKEND...MAKING FOR A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS...OVER THE HIGHER TERRAIN FAR TO THE EAST OF PHOENIX. .DISCUSSION... MID LEVEL MOISTURE...ABV 15K FT...INCREASING OVER SOUTH CENTRAL AZ AND THE PRECIPITABLE WATER TRENDING UPWARDS FROM .51 INCHES YESTERDAY MORNING...TO .69 INCHES LAST EVENING...AND AS OF 12Z THE PSR SOUNDING IS .89 INCHES. THIS MORNINGS SFC DEW POINTS ARE UP 15 TO 25 DEGREES FROM 24 HOURS AGO...MAINLY IN THE 45 TO 55 DEG RANGE...HIGHER IN SOME PLACES. TAKING INTO CONSIDERATION THE MID AND HIGH LVL CLDS...STILL THINKG THAT TODAYS AFTERNOON HIGH TEMPERATURES IN SOUTH CENTRAL AZ WILL BE SUPPRESSED SOME...FROM YESTERDAYS NEAR RECORD HIGHS. ELSEWHERE...SOUTHEAST CA IS ON THE NRN SIDE OF JET STREAK...CLR. WHILE SOUTHWEST AZ IS UNDER THE 70 KT JET MAX...THIN CI WILL CONT THROUGH TNGT. OVERALL PATTERN LOOKS SIMILAR IN THIS MORNINGS MODELS...SO FCST GENLY RMNS THE SAME. 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, 4:10 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 65 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.