Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 76, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 19, 2001, 5:59 PM MST for Yavapai County, Arizona. It was in force for 31 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
- Aug 19, 2001, 5:59 PM MST (00:59 UTC)
- Expired
- Aug 19, 2001, 6:30 PM MST
- In force
- 31 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Yavapai County, AZ
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 1.0 hours before the alert went out and 64 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
- 362 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 2160 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
287 WUUS55 KFGZ 200100 SVRFLG AZC025-200130- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 559 PM MST SUN AUG 19 2001 THE NATIONAL WEATHER SERVICE HAS EXTENDED THE * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL YAVAPAI COUNTY IN ARIZONA THIS INCLUDES THE CITIES OF...RIMROCK...LAKE MONTEZUMA... MCGUIREVILLE * UNTIL 630 PM MST * AT 559 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER MCGUIREVILLE...MOVING NORTHEAST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... LAKE MONTEZUMA RIMROCK INTERSTATE 17 BETWEEN MILEMARKERS 289 AND 293 VERY LARGE HAIL UP TO THE SIZE OF QUARTERS IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...SEEK SUBSTANTIAL SHELTER IMMEDIATELY. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WINDS IN EXCESS OF 58 MPH...LARGE HAIL...AND DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. STAUDENMAIER REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3467 11189 3453 11180 3461 11161 3478 11173
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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 2:30 PM MST, 3 hours 29 minutes earlier.
Area forecast discussion, Aug 19, 2:30 PM MST, 3 hours 29 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST SUN AUG 19 2001 .SYNOPSIS...HIGH PRESSURE CURRENTLY OVER NORTHEAST ARIZONA WILL CONTINUE TO MOVE EASTWARD TONIGHT. AS A RESULT...SOUTHERLY FLOW ALOFT WILL BRING AN INCREASE IN MONSOONAL MOISTURE TO THE STATE. AN UPPER LEVEL DISTURBANCE EMBEDDED IN THE FLOW WILL RESULT IN AN UPSWING IN SHOWERS AND THUNDERSTORMS AND COOLER DAYTIME TEMPERATURES TOMORROW. A WESTERLY FLOW ALOFT WILL BRING DRIER AND WARMER WEATHER TO THE STATE BY THE MIDDLE OF NEXT WEEK. .DISCUSSION...CONVECTION OFF TO A LATE START TODAY WITH COVERAGE JUST BECOMING SCATTERED ATTM. A COUPLE OF SYNOPTIC FEATURES INDICATE AN UPSWING IN THUNDERSTORM ACTIVITY OVER THE NEXT 24 HOURS. HIGH PRESSURE OVER NORTHEAST AZ TODAY WILL CONTINUE TO MOVE EASTWARD TONIGHT. THIS WILL RESULT IN THE LOWER TROPOSPHERIC FLOW BECOMING MORE SOUTHERLY WITH TIME AND AN INCREASE IN MOISTURE TRANSPORT ACROSS AZ. THE OTHER FEATURE OF INTEREST IS A WEAK DISTURBANCE EMBEDDED IN THE FLOW ALONG THE AZ/MEXICO BORDER. MESOETA HAS BEST HANDLE ON THIS FEATURE AND MOVES IT NORTHWARD INTO SOUTH CENTRAL AZ TONIGHT AND INTO NORTHERN AZ EARLY TOMORROW. FLOW BECOMES WESTERLY LATE MONDAY INTO TUESDAY AS A TROF OF LOW PRESSURE MOVES INTO THE WEST COAST AND BEGINS TO ADVECT DRIER AIR INTO THE STATE. ETA/AVN SHOWS AN ATTENDANT 50 KT JET WITH THIS TROF WHICH CLIPS THE NORTHWEST PART OF THE STATE ON TUESDAY. THIS FEATURE BEARS WATCHING AS ENERGETICS INTERACT WITH RESIDUAL MOISTURE AND SHEAR PROFILE BECOMES FAVORABLE FOR POSSIBLE SVR WX DAY ON TUESDAY. ETA/AVN THEN SWEEP THE MOISTURE OUT OF ALL BUT FAR EASTERN AZ ON WEDNESDAY. IN THE EXTENDED...DRY AIR REMAINS OVER THE FORECAST AREA THROUGH THE PERIOD. PER CONSENSUS WITH NEARBY OFFICES DURING COORDINATION CALL...WILL KEEP CHANCE SHOWERS ALONG THE EASTERN AZ/NM BORDER ZONES ON WEDNESDAY...THEN DRY CONDITIONS/MOSTLY CLEAR FORECAST THROUGH SUNDAY. TW .FGZ...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 5:35 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 25 min |
| Aug 19, 6:29 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 31 min |
| Aug 19, 7:00 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 30 min |
| Aug 20, 10:34 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 26 min |
| Aug 20, 10:34 AM MST | Severe Thunderstorm Warning | FGZ | Navajo | 26 min |
| Aug 20, 11:03 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 27 min |
| Aug 20, 11:19 AM MST | Severe Thunderstorm Warning | FGZ | Navajo | 26 min |
| Aug 20, 11:37 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 33 min |
| Aug 20, 1:09 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 36 min |
| Aug 20, 2:07 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 23 min |
| Aug 20, 2:35 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 25 min |
| Aug 20, 2:54 PM MST | Flash Flood Warning | FGZ | Apache | 66 min |
| Aug 20, 4:40 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 35 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.