Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 23, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 7, 1997, 1:44 PM MST for Pima County, Arizona. It was in force for 46 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 7, 1997, 1:44 PM MST (20:44 UTC)
- Expired
- Jul 7, 1997, 2:30 PM MST
- In force
- 46 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties
County Pima County, AZ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 7, 2:00 PM MST | Thunderstorm Wind | Tucson, AZ | Thunderstorm winds downed several power lines, blew a stoplight down, snapped a 30-foot Palm tree in half, and split a 15-foot high tree in two. |
| Jul 7, 2:00 PM MST | Hail 0.75 | Tucson, AZ |
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
Tuscon, AZ (KTUS), launched 12:00Z, 8.7 hours before the alert went out and 84 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
- 807 J/kg
- Mixed-layer CIN
- -222 J/kg
- Mixed-layer LCL
- 2117 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUS 072044 RRA SVRTUS AZC019-072130- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 144 PM MST MON JUL 7 1997 THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 230 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHERN ARIZONA ...EASTERN PIMA COUNTY AT 145 PM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN THE VICINITY OF CENTRAL TUCSON MOVI8NG EAST NORTHEAST AT 15 MPH. THIS STORM WILL AFFECT MUCH OF TUCSON WITH POTENTIALLY DAMAGING WIND. BRYANT
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 7, 9:17 AM MST, 4 hours 27 minutes earlier.
Area forecast discussion, Jul 7, 9:17 AM MST, 4 hours 27 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 915 AM MST MON JUL 7 1997 NOT A BAD 12Z TUS RAOB. PW UP TO .96 WITH COOLING TEMP PROFILE LWR LAYERS. OUTFLOW FROM LAST NGTS NW MEX CONVECTION AGN ON THE SHALLOW SIDE BUT THESE ARE STARTING TO MOUNT UP. DIRECT SLY MSTR INFLUX DONE ATTM FOR OUR AREA (ALTHO YUMA KYUX STILL SHOWING WK SURGE ALONG WITH SFC DEWPTS IN THE LWR 70S)...SO LWR LVLS AND SFC DEWPTS SHUD ONCE AGN MIX OUT LATER TDA. WV IMAGERY SHOWING DRIER AREA PUSHING IN ALF FROM THE W. STILL...SHUD BE ENUF FOR A FEW MORE CLDS THAN PREV FCST ADVERTISED AS WELL AS SOME ISOLD DRY TSTM ACTION IN ZN019 AND SRN ZN028 TO GO WITH ZN030. MSTR WITH LWR LVL COOLING MAY ALSO KNOCK TEMPS DOWN A COUPLE DEGS. ALL REFLECTED IN UPDATE A LTL ERYR. MSTR HAS BEEN HANGING ON (WITH NGTLY REINFORCEMENTS FROM OLD MEX) IN THE FACE OF GENERALLY WLY FLOW FOR SEVERAL DAYS. SIGNS WLY FLOW WILL INCR WITH MEX ACTIVITY SUPRESSED A BIT..4.MORE ON THAT THIS AFTN. TUS 000. MEYER TUS...NONE
In the hours before
Special weather statement, Jul 7, 11:45 AM MST, 1 hour 59 minutes before
AZZ019-026>030-080700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1145 AM MST MON JUL 7 1997
AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 30 30 0 0 W10
GRAHAM 20 10 0 0 W10
GREENLEE 20 0 0 0 SW15
TUCSON/ERN PIMA 30 30 0 0 W15
TOHONO OODHAM 0 0 0 0
WESTERN PIMA 0 0 0 0
SOUTHEAST PINAL 10 0 0 0 W10
SANTA CRUZ 30 30 0 0 W10
SYNOPSIS...
INFLUX OF MOISTURE AND INSTABILITY FROM NORTHERN MEXICO OVERNIGHT
ADDED TO WHAT WAS HERE HAS INCREASED THE CHANCE OF THUNDERSTORMS
TODAY AND THIS EVENING THROUGH ESPECIALLY COCHISE...SANTA CRUZ
AND EASTERN PIMA COUNTIES. SOME STORMS THIS AFTERNOON WILL HAVE
THE POTENTIAL TO GENERATE SEVERE WEATHER WITH STRONG GUSTY WINDS.
RAINFALL AMOUNTS SHOULD GENERALLY BE A TENTH OF AN INCH OR LESS
FROM ANY GIVEN STORM.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
REACH SEVERE LEVELS (DAMAGING WIND AND/OR
LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
ANY LOCATION
STORM MOTION - GENERAL DIRECTION FROM WHICH THE STORMS WILL
LIKELY MOVE AND SPEED IN MPH
NOTE...
VALID TIME IS FROM 12 NOON TO 12 MIDNIGHT OF THE DAY OF ISSUANCE
THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES.
END/WJMSpecial weather statement, Jul 7, 11:51 AM MST, 1 hour 53 minutes before
AZZ019-026>030-080700-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1145 AM MST MON JUL 7 1997
AREAL PROBABILITY RAIN GREATER THAN STORM
COVERAGE OF SEVERE 1.00 2.00 MOTION
COCHISE 30 30 0 0 W10
GRAHAM 20 10 0 0 W10
GREENLEE 20 0 0 0 SW15
TUCSON/ERN PIMA 30 30 0 0 W15
TOHONO O'ODHAM 0 0 0 0
WESTERN PIMA 0 0 0 0
SOUTHEAST PINAL 10 0 0 0 W10
SANTA CRUZ 30 30 0 0 W10
SYNOPSIS...
INFLUX OF MOISTURE AND INSTABILITY FROM NORTHERN MEXICO OVERNIGHT
ADDED TO WHAT WAS HERE HAS INCREASED THE CHANCE OF THUNDERSTORMS
TODAY AND THIS EVENING THROUGH ESPECIALLY COCHISE...SANTA CRUZ
AND EASTERN PIMA COUNTIES. SOME STORMS THIS AFTERNOON WILL HAVE
THE POTENTIAL TO GENERATE SEVERE WEATHER WITH STRONG GUSTY WINDS.
RAINFALL AMOUNTS SHOULD GENERALLY BE A TENTH OF AN INCH OR LESS
FROM ANY GIVEN STORM.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
REACH SEVERE LEVELS (DAMAGING WIND AND/OR
LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
ANY LOCATION
STORM MOTION - GENERAL DIRECTION FROM WHICH THE STORMS WILL
LIKELY MOVE AND SPEED IN MPH
NOTE...
VALID TIME IS FROM 12 NOON TO 12 MIDNIGHT OF THE DAY OF ISSUANCE
THIS PRODUCT IS NOT TO BE USED IN PLACE OFN SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES.
END/WJMThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 12:45 PM MST | Severe Thunderstorm Warning | TWC | Cochise | 65 min |
| Jul 7, 3:12 PM MST | Severe Thunderstorm Warning | TWC | Pima | 63 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997
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.