Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 1, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Jun 20, 2001, 5:52 PM MST for Pima County, Arizona. It was in force for 38 min. 1 report came from 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, with what was reported inside it.
The facts
- Issued
- Jun 20, 2001, 5:52 PM MST (00:52 UTC)
- Expired
- Jun 20, 2001, 6:30 PM MST
- In force
- 38 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pima County, AZ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 20, 5:55 PM MST | Thunderstorm Wind | 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 00:00Z, 0.9 hours before the alert went out and 9 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
- 879 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 3149 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTWC 210053 SVRTUS AZC019-210130- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 552 PM MST WED JUN 20 2001 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL PIMA COUNTY IN ARIZONA THIS INCLUDES CITY OF TUCSON * UNTIL 630 PM MST * AT 545 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES NORTHEAST OF TUCSON...MOVING NORTHEAST AT 20 MPH. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND HEAVY RAIN. LAT...LON 3226 11109 3208 11092 3226 11063 3238 11079
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 Jun 20, 2:55 PM MST, 2 hours 57 minutes earlier.
Area forecast discussion, Jun 20, 2:55 PM MST, 2 hours 57 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 255 PM MST WED JUN 20 2001 SYNOPSIS...HIGH PRESSURE HAS FOUND ITS HOME OVER SOUTHERN ARIZONA AND WILL REMAIN OVER THE STATE FOR AT LEAST THE NEXT SEVERAL DAYS. MOISTURE WORKING ITS WAY WEST ALONG THE MEXICO BORDER WILL CONTINUE TO PROVIDE THE FUEL FOR AFTERNOON THUNDERSTORMS EACH DAY THIS WEEK. DISCUSSION...PRECIPITABLE WATER VALUES REMAIN QUITE GOOD ACROSS THE CWA TODAY. SOUNDINGS INDICATE 1.17 IN IN TUCSON...1.11 IN PHOENIX AND 1.09 IN IN YUMA. THE TONGUE OF MOISTURE BETWEEN TUCSON AND YUMA DEPICTED WELL ON GOES IMAGERY. THE 12Z ETA IS THE MODEL OF CHOICE TODAY. IT APPEARS TO HAVE A BETTER HANDLE ON THE VORTICITY FIELD WHEN OVERLAID ATOP OF THE H20 VAPOR IMAGE. STILL LOOKS LIKE BEST ACTIVITY THIS EVENING WILL OCCUR TO THE SE OF TUCSON WHERE A WEAK COL IN THE 700 MB FLOW WILL OPEN UP. THIS IS ALSO SEEN IN THE ETA H7 OMEGA FIELD. STILL AM WAVERING WHETHER TO PUT ISOLATED OR SCATTERED WORDING OUT EAST FOR TONIGHT. EXPECT A SLIGHT RAMP UP IN THUNDERSTORM ACTIVITY LATE THU AFTERNOON AND EVENING OVER SE AZ. THE ETA HAS A H3 SPEED DIVERGENCE MAX OVER SONORA BY 00Z FRI...THEN PUSHES NORTHWARD INTO THE SOUTHERN FRINGES OF OUR CWA BY 06Z. CURRENT MOISTURE ACROSS THE REGION SHOULD STICK AROUND FOR TOMORROW...HELPING TO FUEL STORM DEVELOPMENT. OTHERWISE...THE H5 RIDGE WILL CONTINUE TO BUILD NORTHWARD THROUGH TOMORROW AND THEN SHIFT EAST FRIDAY...IN RESPONSE TO A UPPER LOW MOVING INTO THE PACIFIC NORTHWEST. THIS WILL ALLOW FOR A FAVORABLE SOUTHEAST FLOW TO PUSH ADDITIONAL MOISTURE INTO THE CWA THIS WEEKEND. WILL OPT TO KEEP THE MENTION OF AFTERNOON AND EVENING THUNDERSTORMS IN FAR SE AZ THRU MID NEXT WEEK. TEMPERATURES WILL CONTINUE TO BE MODERATED BY THE INCREASED MOISTURE IN THE REGION... THEREFORE NOT MUCH CHANGE IN TEMPS THROUGH WED. .TWC...NONE.
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 6:32 PM MST | Severe Thunderstorm Warning | TWC | Pima | 43 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.