Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 20, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jul 19, 2001, 4:20 PM MST for Pima County, Arizona. It was in force for 40 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 19, 2001, 4:20 PM MST (23:20 UTC)
- Expired
- Jul 19, 2001, 5:00 PM MST
- In force
- 40 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, 11.3 hours before the alert went out and 29 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
- 235 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 1932 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 10 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 KTWC 192321 SVRTUS AZC019-200000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 420 PM MST THU JUL 19 2001 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEAST PIMA COUNTY IN ARIZONA THIS INCLUDES AREAS EAST OF GREEN VALLEY AND SAHUARITA * UNTIL 500 PM MST * AT 416 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES NORTHEAST OF GREEN VALLEY...MOVING NORTHEAST AT 10 MPH. FLASH FLOOD WARNING IS IN EFFECT FOR THE SAME AREA UNTIL 515 PM MST. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING WINDS IN EXCESS OF 58h MPH...DEADLY LIGHTNING...AND HEAVY RAIN. LAT...LON 3178 11110 3178 11083 3214 11083 3213 11109
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 19, 2:30 PM MST, 1 hour 50 minutes earlier.
Area forecast discussion, Jul 19, 2:30 PM MST, 1 hour 50 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 230 PM MST THU JUL 19 2001 SYNOPSIS...SOUTHEAST ARIZONA WILL REMAIN UNDER A MOIST FLOW FROM THE SOUTH. THIS WILL RESULT IN AFTERNOON AND EVENING THUNDERSTORMS. THERE MAY BE SOME INCREASE IN THE THUNDERSTORM ACTIVITY LATER IN THE WEEKEND. DISCUSSION...A LITTLE QUICKER...AND MORE SOUTHWESTERLY FLOW TODAY BUT STORMS JUST IN ABOUT THE SAME POSITION AS YESTERDAY. SO WILL CONTINUE TREND OF PREVIOUS FORECAST AND HAVE US IN A STANDARD MONSOON PACKAGE NEXT FEW DAYS. EXPECTING A FAIRLY BIG BLAST IN NORTHERN MEXICO TONIGHT WHICH MAY RESULT IN LOW LEVEL OUTFLOW WORKING INTO AREA BUT NOT EXPECTING A SURGE. THUNDERSTORM COMPLEX NEAR MMGM LOOKS OUT OF PLACE...RARE TO SEE SOMETHING THAT CLOSE TO THE COAST BUT MAY BE A RESULT OF LAST NIGHTS CONVECTION. MODELS HINT AT MORE ESTABLISHED EASTERLY FLOW OVER THE WEEKEND AND TROPICAL WAVE NEAR 100 WEST MAY HAVE A CHUNK MOVE UP THIS WAY SUNDAY OR SO. .TWC...NONE.
In the hours before
Special weather statement, Jul 19, 11:06 AM MST, 5 hours 14 minutes before
AZZ019-029>035-200700- SOUTHEAST ARIZONA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1145 AM MST THU JUL 19 2001 .SYNOPSIS...SOUTHEAST ARIZONA WILL REMAIN IN THE DEEP MONSOONAL MOISTURE THIS AFTERNOON AND EVENING...WHILE OTHER ADJACENT PORTIONS OF THE STATE STAY RELATIVELY DRY. EXCEPT FOR A POSSIBLE EARLIER START TO CONVECTION...ENVIRONMENTAL CONDITIONS ARE SIMILIAR TO WEDNESDAY. THEREFORE EXPECT A LOCALIZED THREAT OF SEVERE WEATHER AND FLASH FLOODING. .DISCUSSION...12Z TUCSON SOUNDING SIMILIAR TO WEDNESDAY...EXCEPT NO CAP TO SLOW THUNDERSTORM DEVELOPMENT. THIS TRANSLATES INTO AN EARLIER START TIME FOR CONVECTION...ALREADY EVIDENT ON RADAR/SATELLITE IMAGERY. LOW LEVEL DEWPOINT/THETA E VALUES SHOW A CONTINUED THREAT OF LOCALIZED FLASH FLOODING. AS SEEN YESTERDAY IN TUCSON...THE POTENTIAL ALSO EXISTS FOR WET MICROBURSTS IN MERGING STORMS WITH WIND GUSTS IN EXCESS OF 60 MPH. STORM MOVEMENT WILL BE A LITTLE BIT FASTER TODAY...TO THE NORTH AROUND 10 MPH. THERE IS NO DISCERNABLE SYNOPTIC SCALE FEATURE TO ORGANIZE CONVECTION ACROSS SOUTHEAST ARIZONA TODAY. THERE IS GOOD 300 MB DIVERGENCE AND OMEGA OVER NORTHWEST MEXICO THIS EVENING FOR MCS DEVELOPMENT...THEREFORE SHOULD GET AN INFLUX OF LOW LEVEL MOISTURE INTO FAR SOUTHEAST ARIZONA FROM OUTFLOW BOUNDARIES OVERNIGHT. OKULSKI
Special weather statement, Jul 19, 11:45 AM MST, 4 hours 35 minutes before
AZZ019-029>035-200700- SOUTHEAST ARIZONA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1145 AM MST THU JUL 19 2001 .SYNOPSIS...SOUTHEAST ARIZONA WILL REMAIN IN THE DEEP MONSOONAL MOISTURE THIS AFTERNOON AND EVENING...WHILE OTHER ADJACENT PORTIONS OF THE STATE STAY RELATIVELY DRY. EXCEPT FOR A POSSIBLE EARLIER START TO CONVECTION...ENVIRONMENTAL CONDITIONS ARE SIMILIAR TO WEDNESDAY. THEREFORE EXPECT A LOCALIZED THREAT OF SEVERE WEATHER AND FLASH FLOODING. .DISCUSSION...12Z TUCSON SOUNDING SIMILIAR TO WEDNESDAY...EXCEPT NO CAP TO SLOW THUNDERSTORM DEVELOPMENT. THIS TRANSLATES INTO AN EARLIER START TIME FOR CONVECTION...ALREADY EVIDENT ON RADAR/SATELLITE IMAGERY. LOW LEVEL DEWPOINT/THETA E VALUES SHOW A CONTINUED THREAT OF LOCALIZED FLASH FLOODING. AS SEEN YESTERDAY IN TUCSON...THE POTENTIAL ALSO EXISTS FOR WET MICROBURSTS IN MERGING STORMS WITH WIND GUSTS IN EXCESS OF 60 MPH. STORM MOVEMENT WILL BE A LITTLE BIT FASTER TODAY...TO THE NORTH AROUND 10 MPH. THERE IS NO DISCERNABLE SYNOPTIC SCALE FEATURE TO ORGANIZE CONVECTION ACROSS SOUTHEAST ARIZONA TODAY. THERE IS GOOD 300 MB DIVERGENCE AND OMEGA OVER NORTHWEST MEXICO THIS EVENING FOR MCS DEVELOPMENT...THEREFORE SHOULD GET AN INFLUX OF LOW LEVEL MOISTURE INTO FAR SOUTHEAST ARIZONA FROM OUTFLOW BOUNDARIES OVERNIGHT. OKULSKI
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 4:17 PM MST | Flash Flood Warning | TWC | Pima |
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.