Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 7, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 3, 2001, 7:59 PM MST for Maricopa County, Arizona. It was in force for 61 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Jul 3, 2001, 7:59 PM MST (02:59 UTC)
- Expired
- Jul 3, 2001, 9:00 PM MST
- In force
- 61 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 109 km from the middle of the area, began a volume at 03:02 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 |
|---|---|---|---|
| Jul 3, 8:16 PM MST | Thunderstorm Wind 63 M | Phoenix, AZ | Winds gusted to 63 mph at the Palo Verde Nuclear Generating Station. |
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.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 3.0 hours before the alert went out and 79 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
- 3684 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KPSR 040300 SVRPHX AZC013-040400- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 759 PM MST TUE JUL 3 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WEST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 900 PM MST * AT 752 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES NORTHEAST OF WINTERSBURG...OR ABOUT 10 MILES NORTH OF BUCKEYE...MOVING WEST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... WINTERSBURG AT 820 PM MST TONOPAH AT 825 PM MST AND INTERSTATE 10 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 3344 11260 3362 11260 3366 11314 3336 11314
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 3, 4:05 PM MST, 3 hours 54 minutes earlier.
Area forecast discussion, Jul 3, 4:05 PM MST, 3 hours 54 minutes before
AZZ020>028-CAZ030>033-040545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 405 PM MST TUE JUL 3 2001 .SYNOPSIS... A LARGE HIGH PRESSURE SYSTEM ALOFT...CENTERED OVER THE GREAT BASIN ...WILL DRIFT SLOWLY EASTWARD THIS WEEK. THIS WILL RESULT IN SOUTHEASTERLY WIND FLOW BRINGING MORE MOISTURE TO BOTH SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA. A CORRESPONDING INCREASE IN THUNDERSTORM POTENTIAL CAN BE EXPECTED...AS THE AIR BECOMES MORE MOIST. IT WILL...HOWEVER...TEND TO MODERATE THE DAYTIME TEMPERATURES DOWN TO MORE NORMAL LEVELS BY MID WEEK. .DISCUSSION... AFTERNOON CONVECTION TAKING A SOMEWHAT UNUSUAL PATTEN WITH MORE ACTIVITY OVER YAVAPAI AND MOHAVE COUNTIES THAN IN SOUTHEAST ARIZONA. MEANWHILE ZONE 28 GETTING DOWNBURST STORMS DESPITE MODEST APPEARANCE ON RADAR. LARGE STORM NORTH OF ZONE 24 A LATE BLOOMER WHICH MAY HELP TO BRING STORM THREAT TO PHOENIX METRO AREA. ZONE 21 HAS A BETTER THREAT GIVEN YAVAPAI/MOHAVE ACTIVITY AND STEERING FLOW. WITH APPROACHING INVERTED TROUGH AND SHIFT TO SOUTHEASTERLY FLOW... LOW LEVEL MOISTURE AND THUNDERSTORM ACTIVITY OVER THE CWA WILL BE ON THE INCREASE. TEMPS WILL BE ON THE DECREASE BUT EXPECT TOMORROW TO STILL BE QUITE WARM WITH MORE COOLING THURSDAY. TONIGHTS STORMS WILL BE STRICTLY WIND PRODUCERS...BUT BY THURSDAY THEY WILL TRANSITION TO PRECIP PRODUCERS. WITH MORE CAPE THOUGH THERE WILL STILL BE SEVERE WIND THREAT WITH SOME OF THE STORMS THURSDAY. IN THE EXTENDED...MRF AND ECMWF SHOW WESTERLIES TRYING TO INTRUDE FOR DRYING FROM THE WEST. ONLY WESTERN ZONES ARE LIKELY TO DRY OUT. HOWEVER...IN THE LATTER PART OF THE EXTENDED...THE HIGH CENTER SHIFTS WESTWARD WHICH MIGHT LEAD TO REINTRODUCTION OF MOISTURE INTO WESTERN CWA BY TUESDAY. NOT CONFIDENT ENOUGH IN THAT SCENARIO TO REINTRODUCE STORM POSSIBILITIES. JAMISON
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 5:53 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 37 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001
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.