Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 47, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 30, 2001, 5:54 PM MST for Pinal County, Arizona. It was in force for 51 min. No storm report in the archive falls 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.
The facts
- Issued
- Aug 30, 2001, 5:54 PM MST (00:54 UTC)
- Expired
- Aug 30, 2001, 6:45 PM MST
- In force
- 51 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pinal County, AZ
The radar
The Phoenix radar (KIWA), 39 km from the middle of the area, began a volume at 00:55 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.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 0.9 hours before the alert went out and 105 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
- 1073 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 2004 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
537 WUUS55 KPSR 310054 SVRPHX AZC021-310145- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 554 PM MST THU AUG 30 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 645 PM MST * AT 552 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHEAST OF COOLIDGE. THE STORM WAS MOVING NORTHEAST AT 5 MPH. THIS STORM WILL AFFECT THE COOLIDGE AND FLORENCE AREAS. DAMAGING MICROBURST WINDS AND LARGE HAIL ARE LIKELY 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 3297 11157 3287 11147 3304 11124 3313 11137
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 30, 3:25 PM MST, 2 hours 29 minutes earlier.
Area forecast discussion, Aug 30, 3:25 PM MST, 2 hours 29 minutes before
AZZ020>028-CAZ030>033-310545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 325 PM MST THU AUG 30 2001 .SYNOPSIS... AFTER A BRIEF BOUT WITH ISOLATED THUNDERSTORMS ACROSS SOUTH-CENTRAL ARIZONA TONIGHT...SHORT-TERM DRYING IS ANTICIPATED OVER THE REGION FRIDAY INTO SATURDAY. HOWEVER...AN INCREASINGLY MOIST SOUTHWEST FLOW WILL RETURN TO MOST OF SOUTHWEST AND SOUTH-CENTRAL ARIZONA DURING THE HOLIDAY WEEKEND. A COUPLE OF UPPER LEVEL DISTURBANCES INTERACTING WITH THIS MOISTURE WILL YIELD BETTER CHANCES OF THUNDERSTORMS THE LATTER HALF OF THE HOLIDAY WEEKEND. MEANWHILE...SOUTHEAST CALIFORNIA SHOULD REMAIN RELATIVELY DRY THROUGH THE LABOR DAY WEEKEND. AFTER THAT...DRIER WEATHER SHOULD RETURN TO ALL OF THE FORECAST AREA BY THE MIDDLE OF NEXT WEEK. .DISCUSSION... STORMS FORMING ABOUT THE SAME PLACE AS 24 HOURS AGO PER VISIBLE SATELLITE PIX AND RADAR IMAGERY. ONE DIFFERENCE NOTED IS THE CU FIELD THAT NOW OVERLAYS MARICOPA COUNTY EWD. SOME BUILDUPS TRYING TO FORM TO S OF PHX...WHERE CONVECTIVE TEMPS ARE JUST NOW BEING REACHED AND CAPE IS BEING REALIZED. MORNING ANALYSIS AT 300/250MB ALSO SHOWED A BELT OF STRONGER WINDS JUST TO OUR S...PUTTING ERN PORTION OF CWFA ON CYCLONIC SIDE OF JET FOR POTENTIAL DYNAMICS. BELIEVE WE MAY HAVE A SLIGHTLY UPSCALE VERSION OF LAST NIGHTS STORMS...COVERING AREAS A BIT FURTHER N AND W. OPTED TO GIVE ISOLATED/SLIGHT CHANCE POPS MARICOPA COUNTY EWD THIS EVENING. A COUPLE OF THE STORMS COULD GET NASTY...ESPECIALLY S AND E OF PHX. BY TOMORROW...MODELS GENERALLY AGREE THAT WE WILL SEE SOME TEMPORARY DRYING...SO WILL KEEP ENTIRE CWFA PRECIP-FREE FRIDAY INTO SATURDAY. TEMPS WILL NOT SHOW MUCH DAY-TO-DAY VARIATION INTO THE WEEKEND EITHER...WITH MAX READINGS EXPECTED TO BE NEAR CLIMO. AFTER SATURDAY...THE WEATHER PICTURE GETS A BIT MUDDLED...WITH LARGE DIFFERENCES IN MODEL SOLUTIONS BETWEEN THE ETA AND AVN. ETA HAS MUCH LESS TROUGHING ALONG THE W COAST OVER THE HOLIDAY WEEKEND...WHICH ALLOWS THE REMNANTS OF FLOSSIE TO STAY WAY TO OUR S. HOWEVER...WITH MORE TROUGHING ADVERTIZED BY AVN...SOUTH-SOUTHWEST FLOW IS FORECAST TO MOVE A STRING OF VORT MAXES RIGHT UP INTO THE STATE AFTER SAT. IF THIS HAPPENS...COULD TURN VERY INTERESTING. BLASTUP CONSENSUS WAS GENERALLY TO FAVOR MORE AGRESSIVE AVN SOLUTION. SO...HAVE INTRODUCED TSTM CHANCES SUNDAY AND LABOR DAY FROM MARICOPA COUNTY EWD. AFTER THIS...MRF DEVELOPS A STRONG W COAST TROUGH...WHICH SHOULD BRING DRYING TO THE ENTIRE PHX CWFA. WILL PLAY IT THAT WAY FOR NOW. ESTLE
In the hours before
Special weather statement, Aug 30, 5:24 PM MST, 30 minutes before
AZZ023-024-028-310400-
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
524 PM MST THU AUG 30 2001
...ISOLATED SEVERE THUNDERSTORMS POSSIBLE OVER A PORTION OF SOUTH-
CENTRAL ARIZONA THIS EVENING...
COUNTIES IN THE RISK AREA INCLUDE:
IN ARIZONA...EASTERN MARICOPA AND NORTHWEST PINAL...
THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE:
LOCALLY HEAVY RAINFALL AND WINDS GUSTING 40 TO 50 MPH.
OTHER THREATS INCLUDE: DENSE BLOWING DUST...HAIL...AND CLOUD
TO GROUND LIGHTNING.
STORMS WILL BE MOST NUMEROUS OVER NORTHERN PINAL COUNTY EARLY THIS
EVENING. INDIVIDUAL STORMS WILL MOVE TOWARD THE EAST AND NORTHEAST AT
10 MPH. SPOTTER ACTIVATION MAY BE NECESSARY THIS EVENING.
DGThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 5:27 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 48 min |
| Aug 30, 7:23 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 67 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.