Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 23, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 12, 2001, 2:12 PM MST for Maricopa County, Yuma County, Arizona. It was in force for 48 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
- Aug 12, 2001, 2:12 PM MST (21:12 UTC)
- Expired
- Aug 12, 2001, 3:00 PM MST
- In force
- 48 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Maricopa County, AZ, Yuma County, AZ
The radar
The Yuma radar (KYUX), 130 km from the middle of the area, began a volume at 21:12 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 12, 2:15 PM MST | Thunderstorm Wind 55 E | Dateland, AZ | Severe thunderstorm wind gusts blew down 16 power poles. |
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 text
As transmitted, in the capitals the NWS used until 2016.
454 WUUS55 KPSR 122112 SVRPHX AZC013-027-122200- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 212 PM MST SUN AUG 12 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WEST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA EASTERN YUMA COUNTY IN SOUTHWEST ARIZONA * UNTIL 300 PM MST * AT 210 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF SEVERE THUNDERSTORM IN THE VICINITY OF THE MARICOPA AND YUMA COUNTY LINE FROM NEAR INTERSTATE 8 TO THE EAGLE TAIL MOUNTAINS. DAMAGING MICROBURST WINDS ARE LIKELY WITH THIS STORM. VERY HEAVY RAIN IS ALSO POSSIBLE. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM PASSES. 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 3278 11359 3275 11323 3340 11308 3335 11355
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 12, 10:10 AM MST, 4 hours 2 minutes earlier.
Area forecast discussion, Aug 12, 10:10 AM MST, 4 hours 2 minutes before
AZZ020>028-CAZ030>033-122245- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 1010 AM MST SUN AUG 12 2001 .SYNOPSIS... A LOW PRESSURE SYSTEM OVER ARIZONA MEANS A CHANCE OF SHOWERS AND THUNDERSTORMS FOR SOUTHEAST CALIFORNIA AND ARIZONA TODAY THROUGH MONDAY. HIGH PRESSURE ALOFT WILL BE OFF THE SOUTHERN CALIFORNIA COAST BY MID WEEK. THIS WILL PUSH SOMEWHAT DRIER AIR FROM THE PACIFIC OVER SOUTHEAST CALIFORNIA AND FAR SOUTHWEST ARIZONA...AND ELIMINATE THE CHANCE OF THUNDERSTORMS THERE BY MID WEEK. .DISCUSSION... THE LOW LEVELS OF THE AIRMASS WERE A FEW DEGREES COOLER THIS MORNING COMPARED WITH YESTERDAY MORNING...AND LATE MORNING SURFACE REPORTS WERE ALSO AT LEAST A FEW DEGREES COOLER. THIS SUPPORTS LOWER TEMPERATURES THAT ARE ALREADY IN THE FORECAST FOR TODAY COMPARED WITH YESTERDAY. CYCLONIC FLOW OR A LOW PRESSURE SYSTEM OF SOME SORT IS EXPECTED TO CONTINUE OVER ARIZONA THROUGH TUESDAY. A FLOW ALOFT FROM THE NORTHEAST HAS PUSHED ENOUGH MOISTURE INTO FAR SOUTHEAST ARIZONA TO RESULT IN THUNDERSTORMS THERE...AS WELL AS THE LOWER COLORADO RIVER VALLEY THIS MORNING. PLAN ON KEEPING AT LEAST A SLIGHT CHANCE OF THUNDERSTORMS IN SOUTHEAST CALIFORNIA THROUGH MONDAY NIGHT...AND THE LOWER COLORADO RIVER VALLEY THROUGH TUESDAY. ALSO PLAN ON KEEPING A CHANCE OF SHOWERS AND THUNDERSTORMS FOR THE REMAINDER OF SOUTHWEST AS WELL AS SOUTH-CENTRAL ARIZONA THROUGH TUESDAY NIGHT. AFTER THAT...IT LOOKS AS IF HIGH PRESSURE ALOFT WILL BE NEAR THE SOUTHERN CALIFORNIA COAST WITH DRIER AIR FROM THE PACIFIC MOVING OVER SOUTHEAST CALIFORNIA TO AT LEAST SOUTHWEST ARIZONA WEDNESDAY AND THURSDAY. THERE IS EVEN A POSSIBILITY THAT ENOUGH DRIER AIR COULD PUSH ALL THE WAY TO SOUTH-CENTRAL ARIZONA AND TEMPORARILY ELIMINATE THE CHANCE OF SHOWERS AND THUNDERSTORMS FOR SOUTH-CENTRAL ARIZONA WEDNESDAY AND THURSDAY. WILL DISCUSS THIS ISSUE AT THE MID DAY COORDINATION CALL WITH LAS VEGAS...FLAGSTAFF... AND TUCSON NATIONAL WEATHER SERVICE OFFICES. ELLIS
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 5:15 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 30 min |
| Aug 11, 9:10 PM MST | Severe Thunderstorm Warning | PSR | La Paz, Yuma | 35 min |
| Aug 11, 10:19 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 41 min |
| Aug 11, 10:30 PM MST | Flash Flood Warning | PSR | Yuma |
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; radar from the NEXRAD Level II archive.