Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 14, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 3, 2001, 7:38 PM MST for Maricopa County, Arizona. It was in force for 37 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 3, 2001, 7:38 PM MST (02:38 UTC)
- Expired
- Aug 3, 2001, 8:15 PM MST
- In force
- 37 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), 46 km from the middle of the area, began a volume at 02:37 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, 2.6 hours before the alert went out and 159 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
- 483 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 2515 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 39 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 040241 SVRPHX AZC013-040315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 738 PM MST FRI AUG 3 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 815 PM MST. * AT 738 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME EAST CENTRAL MARICOPA COUNTY OVER APACHE LAKE. OR ABOUT 8 MILES SOUTHWEST OF ROOSEVELT.... MICROBURST WINDS OF 60 MILES PER HOUR ARE LIKELY WITH THIS STORM. BOATERS ON APACHE LAKE SHOULD SEEK SHELTER IMMEDIATELY. 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 3356 11143 3348 11131 3355 11108 3366 11123 AJ
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 3, 10:07 AM MST, 9 hours 31 minutes earlier.
Area forecast discussion, Aug 3, 10:07 AM MST, 9 hours 31 minutes before
AZZ020>028-CAZ030>033-032245- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 1007 AM MST FRI AUG 3 2001 .SYNOPSIS... STRONG HIGH PRESSURE WILL REMAIN OVER THE CENTRAL UNITED STATES FOR THE NEXT COUPLE OF DAYS...THEN WILL MOVE OVER THE NORTHERN ROCKIES BY EARLY NEXT WEEK. AN EASTERLY FLOW ALOFT...COUPLED WITH ABUNDANT MOISTURE...WILL BRING A CHANCE FOR MAINLY AFTERNOON AND NIGHTTIME THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA TODAY AND SATURDAY...THEN OVER MOST OF SOUTHWEST AND SOUTH-CENTRAL ARIZONA...AS WELL AS PART OF SOUTHEAST CALIFORNIA...BY SUNDAY AND ON INTO THE MIDDLE OF NEXT WEEK. .DISCUSSION... SEEMS LIKE A LITTLE SUBSIDENCE AND MINOR DRYING HAS MOVED OVER SRN AZ THIS MORNING. SURFACE DEWPOINTS ARE GENERALLY DOWN SOME...WHILE TEMPS ARE UP...LOTS OF SUNSHINE. MINOR IMPULSE MOVED NWD ACROSS THE AREA LAST NIGHT AND EARLY THIS MORNING...BUT DID LITTLE TO ENHANCE CONVECTION IN THE AREA. DID GET A LITTLE RAIN HERE AND THERE...BUT OVERALL A DUD. SOUNDINGS THIS MORNING SHOW THE ATMOSPHERE WAS NOT AFFECTED TOO MUCH BY WHAT ACTIVITY THERE WAS...SO NO PROBLEM IN A RELOAD. STABILITY PARAMETERS APPEAR MORE FAVORABLE TODAY THAN THEY HAVE BEEN...BUT MOISTURE IS DOWN A LITTLE. H5 RIDGE AXIS NOT IN A FAVORABLE POSITION FOR THE PHX CWA...TOO FAR S...AND THE FLOW WILL BE TENDING TOWARD SWLY AS THE INVERTED TROUGH OVER NRN AZ MOVES FARTHER N LATER TODAY. THIS IS NOT GOOD IF WE WANT STORMS AND RAIN. AS THE PREVIOUS FORECASTER MENTIONED...STORMS MAY BECOME ORGANIZED OVER SRN AZ LATE THIS AFTN AND EVE IN A REGION OF LOW INERTIAL STABILITY AND UPPER DIFLUENCE...ALBEIT WEAK DIFLUENCE. OUTFLOW FROM THOSE STORMS COULD HELP TO TRIGGER SOME STORMS OVER PARTS OF THE PHX CWA TONIGHT. THEREFORE...WILL STAY WITH THE GENERAL POPS ALREADY FORECAST...WHICH ARE GENERALLY CLIMO-TYPE POPS....FOR TONIGHT AND BEYOND. HOWEVER...MAY UPDATE THE FORECAST TO TAKE OUT MENTION OF STORMS IN THE PHX METRO AREA THIS AFTERNOON...AS EXPECT A BIT OF A DELAYED START TODAY DUE TO SUBSIDENCE MENTIONED EARLIER. H5 HEIGHTS MAY DROP A BIT SAT AS THE CNTRL US ANTICYCLONE DRIFTS NWD...SO CONVECTION COULD BE MORE PREVALENT SAT AFTN AND EVE...ESPECIALLY OVER S-CNTRL AZ. PROBLEM OF HOW FAR W TO CARRY THE STORMS IS STILL A CONSIDERATION IN EXTENDED FORECAST. GENERAL PATTERN SUGGESTS SOME ACTIVITY MAY EXTEND INTO SERN CA AT TIMES. FOR NOW...WILL LEAVE THE EXTENDED AS IS. WILT
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.