Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 17, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 7, 2001, 4:15 PM MST for Yuma County, Arizona. It was in force for 45 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 7, 2001, 4:15 PM MST (23:15 UTC)
- Expired
- Aug 7, 2001, 5:00 PM MST
- In force
- 45 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Yuma County, AZ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 4:40 PM MST | Thunderstorm Wind 60 E | Wellton, AZ | Severe thunderstorm wind gusts blew down several electric power poles and uprooted many small trees. |
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
Yuma Prvg Ground, AZ (K1Y7), launched 12:00Z, 11.3 hours before the alert went out and 21 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
- 194 J/kg
- Mixed-layer CIN
- -343 J/kg
- Mixed-layer LCL
- 3008 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
291 WUUS55 KPSR 072318 SVRPHX AZC027-080000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 415 PM MST TUE AUG 7 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WEST CENTRAL YUMA COUNTY IN SOUTHWEST ARIZONA... ALONG PORTIONS OF INTERSTATE 8 BETWEEN THE TOWNS OF LIGURTA AND WELLTON. * UNTIL 500 PM MST * AT 406 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED SEVERE THUNDERSTORMS 6 MILES SOUTHEAST OF LIGURTA...OR ABOUT 11 MILES EAST OF FORTUNA FOOTHILLS...MOVING NORTHWEST AT 5 MPH. DENSE BLOWING DUST WITH VISIBILITIES NEAR ZERO IS POSSIBLE. DAMAGING MICROBURST WINDS ARE LIKELY WITH THIS STORM. VERY HEAVY RAIN WITH LOCALIZED FLOODING 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 3267 11441 3250 11422 3264 11407 3273 11413
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 7, 3:10 PM MST, 1 hour 5 minutes earlier.
Area forecast discussion, Aug 7, 3:10 PM MST, 1 hour 5 minutes before
AZZ020>028-CAZ030>033-080545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 310 PM MST TUE AUG 7 2001 .SYNOPSIS... A STRONG WEATHER DISTURBANCE WILL BECOME NEARLY STATIONARY ACROSS FAR EASTERN ARIZONA THE NEXT COUPLE OF DAYS. THIS SYSTEM WILL HELP TO TRIGGER SHOWERS AND THUNDERSTORMS OVER MAINLY SOUTH-CENTRAL ARIZONA THROUGH WEDNESDAY NIGHT. SOUTHWEST ARIZONA AND FAR SOUTHEAST CALIFORNIA WILL REMAIN RELATIVELY DRY. AFTER THIS...THERE WILL BE A TEMPORARY LULL IN THE THUNDERSTORM THREAT ON THURSDAY BEFORE THE UPPER HIGH SHIFTS BACK TO OUR NORTH. THIS SHIFT WILL BRING RENEWED CHANCES OF THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA BY THE END OF THE WEEK. .DISCUSSION... FAIRLY ACTIVE DAY ACROSS MUCH OF CWFA...WITH ISOLATED STORMS EVEN RUMBLING ACROSS SE CA ZONES. DESERT SFC TEMP/DEWPOINT DEPRESSIONS IN THE 40 TO 60 DEG F RANGE STILL GIVING THE SOUNDINGS AN INVERTED V LOOK...ALTHOUGH KIWA RADAR ALSO ESTIMATING SOME ISOLATED HEFTY RAINFALL AMOUNTS. CHECK OF 18Z MESO-ETA SHOWS WE ARE UNDERGOING SOME DYNAMICAL INFLUENCE FROM VORT MAX MOVING IN FROM THE 4 CORNERS AREA. AND...WITH STEERING FLOWS OUT OF THE ENE...BELIEVE SOUTH-CENTRAL DESERTS SHOULD CONTINUE WITH A THREAT OF STORMS WELL INTO THE NIGHT. AFTER TONIGHT...MODELS SETTLE VORT TROUGH ALONG THE AZ/NM BORDER. THIS POSITION WILL PROBABLY KEEP MUCH OF ERN CWFA UNDER THE GUN FOR STORMS THRU TOMORROW. PRESENCE OF DEBRIS CLOUDS FROM TONIGHTS TSTM ACTIVITY COULD SERVE TO PUT A DAMPER ON RENEWED STORMS WEDNESDAY. BECAUSE OF THIS...WILL JUST KEEP LOW GRADE CHANCE POPS IN PLACE INTO TOMORROW NIGHT FOR MARICOPA COUNTY EWD. BY THURSDAY...AZ/NM VORT TROF GETS NUDGED FURTHER TO THE E. THIS SHOULD RESULT IN A TEMPORARY LULL IN STORMS FOR THURSDAY...EXCEPT OVER HIGHER TERRAIN OF ZONE 24. BELIEVE WRN PORTION OF CWFA WILL SEE LESS ACTION THROUGH TOMORROW... WITH HIGH PRESSURE RIGHT OVERHEAD PUTTING A CAP ON CONVECTION. TEMPS OBVIOUSLY WILL BE COOLER NEXT COUPLE OF DAYS IN WAKE OF TSTM ACTIVITY. TURNING TO THE EXTENDED...MEDIUM RANGE MODELS DISAGREE SOMEWHAT IN PLACEMENT OF UPPER RIDGE. WILL GO MORE IN LINE WITH NOGAPS/UKMET WHICH PUTS HIGH BACK INTO FAVORABLE POSITION ALONG UT BORDER. SO... WILL OPT TO MAINTAIN CHANCE POPS SOUTH-CENTRAL ARIZONA DURING THE EXTENDED...KEEPING WRN CWFA DRY. ESTLE
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.