Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 22, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 25, 2001, 5:09 PM MST for Pima County, Arizona. It was in force for 36 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
- Jul 25, 2001, 5:09 PM MST (00:09 UTC)
- Expired
- Jul 25, 2001, 5:45 PM MST
- In force
- 36 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pima County, AZ
The radar
The Tucson radar (KEMX), 37 km from the middle of the area, began a volume at 00:13 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, 0.2 hours before the alert went out and 5 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
- 498 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 2527 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -38 m²/s²
- 0-3 km storm-relative helicity
- -21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTWC 260010 SVRTUS AZC019-260045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 509 PM MST WED JUL 25 2001 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL PIMA COUNTY IN ARIZONA THIS INCLUDES TUCSON * UNTIL 545 PM MST * AT 503 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHEAST OF TUCSON...MOVING NORTH AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... TUCSON AT 520 PM MST WIND GUSTS TO 60 MPH ARE LIKELY. MOVE INSIDE A STRONG BUILDING. LAT...LON 3205 11094 3204 11071 3234 11072 3234 11095 PYTLAK
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 Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 4:51 PM MST, 18 minutes earlier.
Area forecast discussion, Jul 25, 4:51 PM MST, 18 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION...MESOSCALE UPDATE NATIONAL WEATHER SERVICE TUCSON AZ 451 PM MST WED JUL 25 2001 SYNOPSIS...A LOW PRESSURE SYSTEM NEAR LAS VEGAS WILL MOVE NORTHEAST INTO UTAH ON THURSDAY. SOUTHWEST FLOW BEHIND THIS SYSTEM WILL BRING PROGRESSIVELY DRIER AIR INTO THE REGION FOR THE REST OF THE WEEK. MOISTURE MAY ONCE AGAIN INCREASE EARLY NEXT WEEK AS HIGH PRESSURE ORGANIZES OVER NEW MEXICO. DISCUSSION...TAIL OF THE UPPER LEVEL LOW IGNITED SEVERAL STRONG HEAVY RAINERS AS SOON AS IT MADE CONTACT WITH THE SHEAR AXIS EXTENDING FROM SANTA CRUZ COUNTY INTO E PINAL/W GRAHAM COUNTY. STORMS HAVE BEEN TRYING TO BACKBUILD SW, BUT THEY KEEP RUNNING INTO THE UPPER LEVEL CAP WHICH IS STRENGTHENING OVER W PIMA COUNTY. THIS IS CREATING A TEMPERATURE AND MOISTURE BOUNDARY FOR NEW CELLS TO FIRE AND TRAIN, AND WILL WORK WITH 15KTS OF LOW LEVEL SW FLOW AS WELL AS A LITTLE DIRECTIONAL SHEAR. ACCORDING TO THE LATEST VISIBLE IMAGERY, THIS BOUNDARY LIES RIGHT ALONG I-19 FROM NOGALES TO TUCSON, AND THEN N ACROSS THE CATALINAS TOWARD ORACLE AND WINKLEMAN. FLASH FLOODING CONTINUES TO BE THE PRIMARY THREAT IN THIS RATHER NARROW CORRIDOR. RAINFALL RATES UP TO 2 INCHES PER HOUR HAVE BEEN COMMON ACCORDING TO 88D ESTIMATES, AND BASED ON THE REFLECTIVITY PROFILES (MOST OF THE HIGH REFLECTIVITIES IN THE LOWER PARTS OF THE STORM), HAIL CONTAMINATION IS PROBABLY MINIMAL. PYTLAK .TWC...NONE.
In the hours before
Special weather statement, Jul 25, 12:27 PM MST, 4 hours 42 minutes before
AZZ019-029>035-250700- SOUTHEAST ARIZONA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1145 MST TUE JUL 24 2001 .SYNOPSIS...THE LOW PRESSURE SYSTEM NEAR LAS VEGAS HAS PULLED MONSOON MOISTURE INTO SOUTHEAST ARIZONA. THUNDERSTORM ACTIVITY HAS ALREADY DEVELOPED AND WILL CONTINUE INTO THE LATE AFTERNOON AND EVENING HOURS. THE SEVERE THUNDERSTORM AND FLASH FLOODING THREAT IS ABOVE CLIMATOLOGY ACROSS THE ENTIRE COUNTY WARNING AREA. .DISCUSSION...THE INFLUX OF MOISTURE FROM MEXICO IS EVIDENT FROM THE INCREASE IN DEWPOINT TEMPERATURES ACROSS SOUTHEAST ARIZONA. THIS CAN ALSO BE SEEN IN INFRARED AND WATER VAPOR IMAGERY. THUNDERSTORM ACTIVITY IS ALREADY ERUPTING ALONG THE MID LEVEL DRY LINE...SEEN IN WATER VAPOR IMAGERY. THE 18Z TUS SOUNDING SHOWED WIND INCREASING 10 TO 15 KNOTS...2000 CAPE VALUE...AND A LIFTED INDEX OF MINUS 6. THE BEST CHANCE OF SEVERE THUNDERSTORMS WILL BE ALONG THIS MID LEVEL DRY LINE...AN AREA FROM CENTRAL PIMA TO CENTRAL GRAHAM AND COCHISE COUNTIES. SO FOR THE LATE AFTERNOON AND EVENING ORGANIZED AND STRONG CONVECTION IS POSSIBLE. THE FLASH FLOOD THREAT WILL ALSO BE ABOVE CLIMATOLOGY ACROSS THE COUNTY WARNING AREA...WITH THE BEST CHANCES EXTENDING FROM EASTERN PIMA THROUGH THE EASTERN COUNTIES....THIS INCLUDES COCHISE...GRAHAM...SANTA CRUZ...GREENLEE COUNTIES THROUGH THE LATER EVENING HOURS. SOME CELL TRAINING COULD OCCUR AND SOME STORMS COULD LINGER INTO THE OVERNIGHT. STORM MOVEMENT WILL BE NORTHEAST 15 MPH.
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 6:10 PM MST | Flash Flood Warning | TWC | Pima | 50 min |
| Jul 26, 2:07 PM MST | Flash Flood Warning | TWC | Santa Cruz | 53 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.