Alert archive / Texas / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 86, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 27, 2008, 4:09 AM CDT for Burnet County, Llano County, Texas. It was in force for 66 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 27, 2008, 4:09 AM CDT (09:09 UTC)
- Expired
- Apr 27, 2008, 5:15 AM CDT
- In force
- 66 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
Counties Burnet County, TX, Llano County, TX
The radar
The Ft Hood radar (KGRK), 100 km from the middle of the area, began a volume at 09:12 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 27, 4:55 AM CDT | HAIL 0.25 | 10 W Llano, TX | |
| Apr 27, 5:03 AM CDT | HAIL 0.7 | Marble Falls, TX | |
| Apr 27, 5:05 AM CDT | HAIL 0.75 | 1 Wsw Horseshoe Bay, TX | 2 MIN DURATION |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 26, 11:34 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 9.2 hours before the alert went out and 240 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1198 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS54 KEWX 270913
SVREWX
TXC053-299-271015-
/O.NEW.KEWX.SV.W.0086.080427T0909Z-080427T1015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
409 AM CDT SUN APR 27 2008
THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
BURNET COUNTY...
LLANO COUNTY...
* UNTIL 515 AM CDT.
* AT 409 AM CDT...RADAR SHOWS AN AREA OF THUNDERSTORMS DEVELOPING
RAPIDLY FROM WEST OF LLANO AND EXTENDING EAST TO THE WEST PART
OF BURNET COUNTY. THIS IS ALONG AN A LINE OF INSTABILITY THAT
WILL CONTINUE TO MAKE THUNDERSTORMS INCREASE OVER LLANO AND
BURNET COUNTIES IN THE NEXT HOUR.
LARGE HAIL AND DAMAGING WIND IS LIKELY WITH THESE THUNDERSTORMS AS
THEY CONTINUE IN THE NEXT HOUR. HAIL OF PENNY TO NICKEL SIZE
AND WIND GUSTS 45 TO 60 MPH IS POSSIBLE WITH THESE THUNDERSTORMS.
IN ADDITION...FREQUENT DEADLY LIGHTNING WILL ACCOMPANY THESE STORMS.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
8 MILES NORTHWEST OF OATMEAL AND 8 MILES SOUTHEAST OF LAKE VICTOR
BY 415 AM CDT...
SHADY GROVE AND BERTRAM BY 425 AM CDT...
8 MILES SOUTHEAST OF SUNNYLANE BY 430 AM CDT...
JOPPA BY 435 AM CDT...
JOPPA BY 440 AM CDT...
6 MILES SOUTHEAST OF WATSON BY 450 AM CDT...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT SUNDAY
MORNING FOR SOUTH CENTRAL TEXAS.
LAT...LON 3105 9791 3090 9793 3052 9814 3052 9897
3092 9897 3093 9896 3093 9843 3095 9846
3102 9846 3104 9843
TIME...MOT...LOC 0909Z 247DEG 16KT 3079 9817
$$1 follow-up statement
000
WWUS54 KEWX 270940
SVSEWX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
437 AM CDT SUN APR 27 2008
TXC053-299-271015-
/O.CON.KEWX.SV.W.0086.000000T0000Z-080427T1015Z/
BURNET TX-LLANO TX-
437 AM CDT SUN APR 27 2008
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 AM CDT
FOR LLANO AND BURNET COUNTIES...
AT 438 AM CDT...THUNDERSTORMS WERE LOCATED FROM WEST OF LLANO TO
NEAR MARBLE FALLS. THESE THUNDERSTORMS WILL CONTINUE TO DEVELOP
EASTWARD. PENNY TO NICKEL SIZE HAIL IS POSSIBLE...ALONG WITH
WIND GUSTS OF 45 TO 60 MPH. FREQUENT DEADLY LIGHTNING WILL
ACCOMPANY THE THUNDERSTORMS.
THE SEVERE THUNDERSTORM WILL BE NEAR...
6 MILES SOUTHEAST OF WATSON BY 450 AM CDT...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL NOON CDT SUNDAY
FOR SOUTH CENTRAL TEXAS.
LAT...LON 3105 9791 3090 9793 3052 9814 3052 9897
3092 9897 3093 9896 3093 9843 3095 9846
3102 9846 3104 9843
TIME...MOT...LOC 0937Z 247DEG 16KT 3083 9803
$$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 Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 27, 3:57 AM CDT, 12 minutes earlier.
Area forecast discussion, Apr 27, 3:57 AM CDT, 12 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 357 AM CDT SUN APR 27 2008 .DISCUSSION... A STORMY...WET...AND COLD SUNDAY IS IN STORE FOR SOUTH CENTRAL TEXAS AS A STRONG COLD FRONT PUSHES THROUGH THE REGION. THE SURFACE FRONT IS CURRENTLY DRAPED ALONG A LINE FROM THE RED RIVER VALLEY TO MINERAL WELLS TO SAN ANGELO. CONVECTIVE ACTIVITY WILL INCREASE THROUGH THE MORNING HOURS AND DECREASE DURING THE AFTERNOON AS THE FRONTAL BOUNDARY MAKES ITS WAY TO THE COAST. THE WARM AND JUICY AIRMASS AHEAD OF THE FRONT WILL ENABLE STRONG TO SEVERE THUNDERSTORMS TO DEVELOP...WITH MOSTLY LARGE HAIL AND DAMAGING WINDS. PRECIPITABLE WATER VALUES ACROSS THE SOUTHERN HALF OF THE STATE ARE HIGHER THAN NORMAL FOR LATE APRIL...AND INDICATE THE POTENTIAL FOR HEAVY RAINFALL. HOWEVER...SINCE THE HEAVY RAINFALL WILL BE LOCALIZED...A FLASH FLOOD WATCH WILL NOT BE NECESSARY AS WIDESPREAD FLOODING IS NOT EXPECTED TO BE A PROBLEM. THE FRONT HAS BEEN MOVING SLOWER THAN PREVIOUSLY ANTICIPATED...SO THE THREAT FOR SEVERE WEATHER AND HEAVY RAIN WILL CONTINUE THROUGH MUCH OF THE AFTERNOON. BREEZY AND COOL CONDITIONS ARE EXPECTED THROUGH THE AFTERNOON AND OVERNIGHT AS STRONG COLD AIR ADVECTION ENTERS THE REGION. SINCE THE FRONT HAS BEEN SLOWER THAN EXPECTED...THE STRONG WINDS AND CLOUD COVERAGE WILL PERSIST LONGER THAN PREVIOUSLY ANTICIPATED...LIMITING RADIATIONAL COOLING OVERNIGHT. TEMPERATURES MONDAY MORNING WILL STILL BE UNSEASONABLY COOL...AND NEAR-RECORD TEMPERATURES ARE EXPECTED. THE REST OF THE FORECAST PERIOD WILL BE MUCH LESS EXCITING AS ZONAL FLOW ALOFT PREVAILS. A GRADUAL WARMING TREND IS EXPECTED DURING THE WEEK AS SURFACE WINDS RETURN TO THE SOUTHEAST AND ALLOW WARM AND MOIST GULF AIR BACK INTO THE REGION. AN UPPER LEVEL LOW WILL STRENGTHEN ACROSS THE GREAT PLAINS DURING THE MIDDLE OF THE WEEK. THE ASSOCIATED WEAK COLD FRONT PASSING TO THE NORTH OF OUR AREA WILL HELP KEEP TEMPERATURES WITHIN A FEW DEGREES OF LATE APRIL/EARLY MAY NORMALS. NO RAIN IS EXPECTED THROUGH THE WORK WEEK...DESPITE THE RETURN OF GULF FLOW...MOISTURE WILL BE TOO SHALLOW FOR ANY STORMS TO DEVELOP. RECORD LOWS ARE POSSIBLE FOR APRIL 28 AND INDICATED BELOW: AUSTIN BERGSTROM......46 IN 2001 AUSTIN CAMP MABRY.....47 IN 1928 SAN ANTONIO...........48 IN 1997 DEL RIO...............42 IN 1997 && .FIRE WEATHER... STRONG NORTHERLY WINDS ARE EXPECTED THIS AFTERNOON ACROSS THE ENTIRE REGION. HOWEVER...RELATIVE HUMIDITIES WILL REMAIN ABOVE 25 PERCENT. A VERY DRY AIRMASS IS EXPECTED THROUGH THE BEGINNING OF THE WEEK BEHIND THE COLD FRONT...BUT 20 FOOT WINDS WILL BE BELOW 15 MPH ON MONDAY. 20 FT WINDS AND RELATIVE HUMIDITIES MAY APPROACH CRITICAL FIRE WEATHER VALUES ON TUESDAY AFTERNOON. && .PRELIMINARY POINT TEMPS/POPS... AUSTIN CAMP MABRY 66 48 80 51 84 / 100 10 0 0 0 AUSTIN BERGSTROM INTL AIRPORT 66 46 79 44 84 / 100 10 0 0 0 DEL RIO INTL AIRPORT 72 47 83 54 88 / 80 - 0 0 0 SAN ANTONIO INTL AIRPORT 68 46 80 50 85 / 100 10 0 0 0 && .EWX WATCHES/WARNINGS/ADVISORIES... NONE. && 25/08
Hazardous weather outlook, Apr 26, 6:23 PM CDT, 9 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 623 PM CDT SAT APR 26 2008 TXZ171>173-183>194-202>209-217>225-228-271200- LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA- GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE- MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA- FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT- 623 PM CDT SAT APR 26 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TONIGHT... THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING THROUGH TONIGHT ACROSS ALL OF SOUTH CENTRAL TEXAS. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...THERE IS A POTENTIAL FOR LOCALLY HEAVY RAINFALL AMOUNTS OF 1 TO 3 INCHES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... A SLIGHT RISK OF SEVERE THUNDERSTORMS CONTINUES THROUGH MIDDAY SUNDAY. LARGE HAIL...DAMAGING WINDS...AND LOCALLY HEAVY RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BECOME NECESSARY TONIGHT OR EARLY SUNDAY.
In the hours before
Special weather statement, Apr 26, 10:16 PM CDT, 5 hours 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1016 PM CDT SAT APR 26 2008 TXZ171-188-270415- GILLESPIE-LLANO- 1016 PM CDT SAT APR 26 2008 ...A STRONG THUNDERSTORM WAS AFFECTING GILLESPIE AND LLANO COUNTIES... AT 1013 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A SEVERE THUNDERSTORM 17 MILES NORTHWEST OF MASON...MOVING SOUTHEAST AT 27 MPH. THIS STORM IS CAPABLE OF PRODUCING A TORNADO ALONG WITH VERY LARGE HAIL AND DAMAGING WINDS. PEOPLE IN NORTHERN GILLESPIE AND WESTERN LLANO COUNTIES...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.
Special weather statement, Apr 27, 1:45 AM CDT, 2 hours 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
145 AM CDT SUN APR 27 2008
TXZ171>173-183>194-202>209-217>225-228-271200-
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA-
FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT-
INCLUDING THE CITIES OF...LLANO...BURNET...GEORGETOWN...DEL RIO...
ROCKSPRINGS...LEAKEY...KERRVILLE...BANDERA...FREDERICKSBURG...
BOERNE...BLANCO...SAN MARCOS...AUSTIN...BASTROP...GIDDINGS...
BRACKETTVILLE...UVALDE...HONDO...SAN ANTONIO...NEW BRAUNFELS...
SEGUIN...LOCKHART...LA GRANGE...EAGLE PASS...CRYSTAL CITY...
PEARSALL...PLEASANTON...FLORESVILLE...KARNES CITY...GONZALES...
CUERO...HALLETTSVILLE...CARRIZO SPRINGS
145 AM CDT SUN APR 27 2008
...INCREASING RAIN CHANCES THEN COOLER TODAY AND TONIGHT...
THERE WILL BE AN INCREASING CHANCE OF SHOWERS AND THUNDERSTORMS
ACROSS THE HILL COUNTRY AND SOUTH CENTRAL TEXAS THIS MORNING
AHEAD OF AND ALONG A STRONG COLD FRONT...FORECAST TO MOVE ACROSS
THE AREA THIS MORNING.
SOME OF THE THUNDERSTORMS COULD BE SEVERE. BRIEF PERIODS OF
LOCALLY HEAVY RAIN IS LIKELY AS THE SHOWERS AND THUNDERSTORMS
DEVELOP FROM THE NORTH AND MOVE SOUTHEAST.
IN WAKE OF THE COLD FRONT COOLER TEMPERATURES WILL COME LATER
TODAY AND TONIGHT. ALL READY APRIL OF 2008 HAS SEEN ITS SHARE OF
STRONG COLD FRONTS. THIS HAS LIMITED DAYTIME HIGHS FOR THE
MONTH. THE WARMEST DAYS OF APRIL HAVE NOT BEEN AS WARM AS
THE WARMEST DAYS IN MARCH THIS YEAR.
LOWS TONIGHT TO EARLY MONDAY MORNING WILL BE IN THE UPPER 30S TO
NEAR 40 ACROSS THE HILL COUNTRY TO THE 40S ACROSS THE REST OF
SOUTH CENTRAL TEXAS. THIS WILL BE CLOSE TO OR BREAK THE RECORD
DAILY LOWS FOR APRIL 28TH. RECORD DAILY LOWS FOR APRIL 28TH SO FAR
ARE AS FOLLOWS...46 AT AUSTIN BERGSTROM IN 2001... 47 AT AUSTIN
MABRY IN 1928...48 AT SAN ANTONIO IN 1997...AND 42 AT DEL RIO IN
1997.
A REVIEW OF A FEW PAST COOL OUTBREAKS FOR LATE APRIL FOLLOWS WITH
THE HIGHS AND LOWS FOR THE GIVEN DAYS.
APRIL 21ST...1907
AUSTIN DEL RIO SAN ANTONIO
APRIL 21ST 47 AND 43 61 AND 48 51 AND 46
APRIL 22ND TO 24TH...1982
AUSTIN AUSTIN BERGSTROM DEL RIO SAN ANTONIO
APRIL 22ND 56 AND 49 58 AND 50 56 AND 48 53 AND 45
APRIL 23RD 66 AND 49 65 AND 49 58 AND 47 63 AND 45
APRIL 24TH 58 AND 51 64 AND 52 66 AND 50 60 AND 49
APRIL 26TH AND 27TH...1997
AUSTIN DEL RIO SAN ANTONIO
APRIL 26TH 59 AND 53 64 AND 54 63 AND 53
APRIL 27TH 57 AND 53 65 AND 48 59 AND 56
ALL-TIME EXTREME LOWEST TEMPERATURES FOR LATE APRIL AFTER THE 25TH
INCLUDE THE FOLLOWING...40 AT SAN ANTONIO APRIL 30...1996...
38 AT DEL RIO APRIL 30...1908...40 AT AUSTIN MABRY APRIL 30...1907
AND 44 AT AUSTIN BERGSTROM APRIL 26...2001.Special weather statement, Apr 27, 3:35 AM CDT, 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 335 AM CDT SUN APR 27 2008 TXZ171-172-188-190-271000- BLANCO-BURNET-GILLESPIE-LLANO- 335 AM CDT SUN APR 27 2008 ...CHANCE OF SHOWERS AND THUNDERSTORMS WILL INCREASE FOR BLANCO...BURNET...GILLESPIE AND LLANO COUNTIES... AT 335 AM CDT...NATIONAL WEATHER SERVICE RADAR SHOWED AN AREA OF THUNDERSTORMS NORTHWEST OF LLANO TO NORTH OF BURNET. THIS AREA OF THUNDERSTORMS WILL CONTINUE TO FORM SOUTHWARD IN THE NEXT FEW HOURS...AND COULD AFFECT LLANO...BURNET...GILLESPIE AND BLANCO COUNTIES. BRIEF PERIODS OF HEAVY RAIN...STRONG WINDS...HAIL...AND FREQUENT DANGEROUS LIGHTNING WILL ACCOMPANY THESE THUNDERSTORMS.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 2:19 AM CDT | Areal Flood Advisory | EWX | Atascosa, Karnes, Wilson | 116 min |
| Apr 27, 5:00 AM CDT | Areal Flood Advisory | EWX | Blanco, Burnet, Gillespie, Llano, Travis, Williamson | 2 hr |
| Apr 27, 5:00 AM CDT | Areal Flood Advisory | EWX | Blanco, Burnet, Gillespie, Llano, Travis, Williamson | 2 hr |
| Apr 27, 5:15 AM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 45 min |
| Apr 27, 5:57 AM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Hays, Travis | 63 min |
| Apr 27, 6:47 AM CDT | Flash Flood Warning | EWX | Travis | 3 hr |
| Apr 27, 6:57 AM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Travis | 63 min |
| Apr 27, 8:33 AM CDT | Areal Flood Advisory | EWX | Bastrop, Burnet, Fayette, Lee, Williamson | 117 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2008Every severe thunderstorm warning in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.