Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 12, NWS Tucson, AZ

July 5, 2001Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 5, 2001, 12:10 PM MST for Pima County, Arizona. It was in force for 35 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 5, 2001, 12:10 PM MST (19:10 UTC)
Expired
Jul 5, 2001, 12:45 PM MST
In force
35 min
Issued by
NWS Tucson, AZ
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Pima County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 7.2 hours before the alert went out and 14 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.

Skew-T log-pSkew-T log-p diagram, Tuscon, AZ at 12:00Z on 2001-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1608 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 2001-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1608 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
1266 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
0.4
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KTWC 051910
SVRTUS

AZC019-051945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1210 PM MST THU JUL 5 2001

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL PIMA COUNTY IN ARIZONA
  THIS INCLUDES THE SOUTHERN PART OF TUCSON

* UNTIL 1245 PM MST

* AT 1156 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM ABOUT 5 MILE SOUTH OF TUCSON INTERNATIONAL     
  AIRPORT. MOVEMENT OF THE STORM IS TO THE NORTHWEST AROUND 20 MPH.
  THIS STORM WILL AFFECT AREAS AROUND THE AIRPORT AND SOUTH TUCSON.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DArMAGING 
WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND HEAVY RAIN.

LAT...LON 3214 11112 3201 11104 3202 11085 3216 11094

GLUECK

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 5, 9:25 AM MST, 2 hours 45 minutes earlier.

Area forecast discussion, Jul 5, 9:25 AM MST, 2 hours 45 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
925 AM MST THU JUL 5 2001

SYNOPSIS...ISOLATED TO SCATTERED THUNDERSTORMS WILL CONTINUE FOR THE
REMAINDER OF THE WEEK AND INTO THE WEEKEND. HIGH PRESSURE TO OUR
NORTH AND NORTHEAST WILL GUIDE DEEPER MOISTURE INTO SOUTHEAST
ARIZONA...WITH THUNDERSTORM COVERAGE AND THE THREAT OF HEAVY RAIN
INCREASING.

DISCUSSION...TSTMS CONTINUE ALONG MEX BORDER IN SOUTHWEST AZ DUE
TO TROF ON THE BAJA AND LOW LEVEL CONVERGENCE. SHOULD SEE TSTMS
DECREASE NEXT HOUR OR SO AND SHIFT OFF TO THE NORTHWEST. MOISTURE
CONTINUES TO DEEPEN OVER THE AREA AS HIGH SHIFTS SLOWLY EAST. BY
LATER AFTERNOON WITH HEATING AND GOOD MOISTURE PROFILE ALONG WITH
STRONG UPPER DIVERGENCE SHOULD SEE MORE WIDESPREAD TSTMS. ALSO
MID/UPPER LEVEL WINDS ARE VEERING AND WEAKENING DURING THE DAY AND
TSTMS WILL BE SLOWER AND HEAVIER RAIN PRODUCERS. MODIFIED TUS
SOUNDING SHOWS VERY UNSTABLE ATMOSPHERE THIS AFTN. LOOK FOR AN
ACTIVE LATE AFTERNOON AND EVENING THRU THE ENTIRE AREA BUT BEST
TSTMS SHOULD BE FROM WESTERN COCHISE CTY TO THE WESTERN END OF THE
STATE IN BEST MOISTURE AND UPPER DIVERGENCE.

.TWC...NONE.

m

In the hours before

Special weather statement, Jul 5, 12:09 PM MST, 1 minute before
AZZ019-029>035-050700-

SOUTHEAST ARIZONA HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1205 AM MST THU JUL 5 2001

.SYNOPSIS... A MOISTURE INFLUX FROM THE SOUTH IS HELPING INITIATE THE
THUNDERSTORM ACTIVITY ACROSS THE COUNTY WARNING AREA. WITH SLOWER
WINDS ALOFT THE POTENTIAL FOR TRAINING OF STORMS AND FLASH FLOODING
HAS INCREASED.

.DISCUSSION...LOW LEVEL MOISTURE SURGED INTO THE AREA WITH THE 12Z
TUS SOUNDING HAVING PWAT VALUE OF 1.47. THUNDERSTORMS HAVE ALREADY
ERUPTED ACROSS WEST CENTRAL PIMA COUNTY THROUGH WESTERN COCHISE
COUNTY. TRAINING OF THESE STORMS IS LIKELY WITH THE SLOWER WINDS
ALOFT.  FLASH FLOOD THREAT WILL BE HIGHEST FROM EASTERN- PIMA COUNTY
TO CENTRAL COCHISE COUNTY. THE SEVERE WEATHER THREAT WILL ALSO BE
HIGH IN THIS SAME LOCATION.

STORM MOTION WILL BE TOWARDS THE NORTHWEST AT 15 MPH.

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 9:55 AM MSTFlash Flood WarningTWCPima20 min
Jul 5, 11:18 AM MSTFlash Flood WarningTWCPima12 min
Jul 5, 11:45 AM MSTFlash Flood WarningTWCPima30 min
Jul 5, 12:35 PM MSTFlash Flood WarningTWCPima
Jul 5, 1:55 PM MSTFlash Flood WarningTWCCochise35 min
Jul 5, 1:55 PM MSTSevere Thunderstorm WarningTWCPinal65 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.