Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 71, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 19, 2001, 2:29 PM MST for Coconino 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, 2:29 PM MST (21:29 UTC)
- Expired
- Aug 19, 2001, 3:00 PM MST
- In force
- 31 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Coconino County, AZ
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.5 hours before the alert went out and 89 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
- 208 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 2231 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
429 WUUS55 KFGZ 192130 SVRFLG AZC005-192200- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 229 PM MST SUN AUG 19 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME SOUTHEASTERN COCONINO COUNTY IN ARIZONA * UNTIL 300 PM MST * AT 229 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME SOUTHEASTERN COCONINO COUNTY...OR ABOUT 18 MILES NORTHEAST OF CLINTS WELL. THE STORM WAS NEARLY STATIONARY. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... STATE ROUTE 87 NEAR BLUE RIDGE CAMPGROUNDS HAIL UP TO ONE INCH IN DIAMETER HAS BEEN REPORTED WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...SEEK SUBSTANTIAL SHELTER IMMEDIATELY. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3471 11118 3458 11103 3471 11083 3482 11107
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, 9:30 AM MST, 4 hours 59 minutes earlier.
Area forecast discussion, Aug 19, 9:30 AM MST, 4 hours 59 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST SUN AUG 19 2001 .SYNOPSIS...HIGH PRESSURE CURRENTLY OVER THE DESERT SOUTHWEST WILL MOVE TO THE EAST OF ARIZONA TODAY. 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...ESPECIALLY ON MONDAY. LOOK FOR COOLER TEMPERATURES ACROSS THE NORTHLAND BY MONDAY. A WESTERLY FLOW ALOFT WILL BRING DRIER AND WARMER WEATHER TO THE STATE BY THE MIDDLE OF NEXT WEEK. .DISCUSSION...HIGH PRESSURE CURRENTLY NEAR NORTHEAST AZ WILL MOVE TO THE EAST TODAY WHICH WILL RESULT IN A MORE SOUTHERLY FLOW AND AN INCREASE IN MOISTURE ACROSS AZ. MOISTURE FLUX ACROSS AZ ALREADY IN PROGRESS THIS MORNING AS SFC OBS INDICATE A 2 TO 4 DEGREE INCREASE IN DEWPTS FROM YESTERDAY MORNING. GOES PRECIPITABLE WATER (PW) IMAGERY AND MORNING RAOBS ALSO SHOWING 1 TO 1.6 INCHES OF PW IN THE LOWER DESERTS...NORTHWARD ALONG THE COLORADO RIVER WITH 0.6 TO 0.8 INCH PW OVER NORTHERN AZ. MESOETA ALSO PICKS UP THE DISTURBANCE EMBEDDED IN THE FLOW JUST SOUTH OF THE AZ BORDER. THIS FEATURE PROGGED TO MOVE NORTHWARD INTO SOUTH CENTRAL AZ TODAY...THEN INTO NORTHERN AZ TONIGHT THROUGH EARLY MONDAY. THUS...EXPECT MONDAY TO BE A CONVECTIVE DAY ACROSS THE FORECAST AREA. FLOW BECOMES WESTERLY ON TUESDAY AS TROF OF LOW PRESSURE MOVES INTO THE COAST AND ADVECTS DRIER AIR INTO THE STATE. ETA/AVN SWEEP THE MOISTURE OUT OF THE FORECAST AREA BY WEDNESDAY. ETA/AVN SHOW AN ATTENDANT 50 KT JET CLIPPING THE NORTHWEST PART OF THE STATE ON TUESDAY. THIS FEATURE WILL BEAR WATCHING AS ENERGETICS INTERACT WITH RESIDUAL MOISTURE. TW .FGZ...NONE.
In the hours before
Special weather statement, Aug 19, 8:45 AM MST, 5 hours 44 minutes before
AZZ004>018-037>040-191930- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 845 AM MST SUN AUG 19 2001 ...MONSOON MOISTURE RETURNS TO NORTHERN ARIZONA TODAY... HIGH PRESSURE WILL MOVE TO THE EAST AND ALLOW A MOIST SOUTHEASTERLY FLOW TO DEVELOP OVER ARIZONA TODAY. MONSOONAL MOISTURE CURRENTLY LOCATED ALONG THE ARIZONA-MEXICO BORDER WILL BEGIN TO MOVE NORTHWARD TODAY AND TONIGHT. EXPECT SCATTERED SHOWERS TO DEVELOP OVER AND SOUTH OF THE MOGOLLON RIM THIS AFTERNOON...BECOMING MORE WIDESPREAD THIS EVENING AND SPREADING NORTHWARD TO THE UTAH BORDER. SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING STRONG AND GUSTY WINDS.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 3:05 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 25 min |
| Aug 19, 4:26 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 34 min |
| Aug 19, 4:59 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 31 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.