Alert archive / Texas / Red Flag Warnings in 2011
Red Flag Warning 15, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this red flag warning at Apr 18, 2011, 1:21 PM CDT for 17 counties in Texas. It took effect at Apr 19, 2011, 10:00 AM CDT. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 18, 2011, 1:21 PM CDT (18:21 UTC)
- In effect from
- Apr 19, 2011, 10:00 AM CDT
- Expired
- Apr 19, 2011, 8:00 PM CDT
- In force
- 10 hr
- Issued by
- NWS Austin/San Antonio, TX
Counties Bandera County, TX, Blanco County, TX, Burnet County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Gillespie County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Llano County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Val Verde County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 90 km from the middle of the area, began a volume at 18:27 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.
The nearest sounding before it
Del Rio, TX (KDRT), launched 12:00Z, 6.4 hours before the alert went out and 137 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
- 2447 J/kg
- Mixed-layer CIN
- -310 J/kg
- Mixed-layer LCL
- 656 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
124 WWUS84 KEWX 181821 RFWEWX URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 121 PM CDT MON APR 18 2011 ...A RED FLAG WARNING IS IN EFFECT FROM 10 AM CDT TUESDAY UNTIL 8 PM CDT FOR THE HILL COUNTRY...EDWARDS PLATEAU...AND RIO GRANDE PLAINS DUE TO BREEZY AND VERY DRY CONDITIONS... .AN UPPER LEVEL LOW PRESSURE SYSTEM MOVING EASTWARD ACROSS THE GREAT PLAINS WILL CAUSE THE DRYLINE TO PUSH EASTWARD INTO SOUTH CENTRAL TEXAS ON TUESDAY. VERY DRY AND BREEZY WEST TO SOUTHWEST WINDS OF 15 TO 20 MPH WILL MIX DOWN TO THE SURFACE BEHIND THE DRYLINE. AFTERNOON RELATIVE HUMIDITIES WILL FALL TO NEAR 25 PERCENT ALONG HIGHWAY 281...AND INTO THE SINGLE DIGITS ACROSS WESTERN PORTIONS OF THE REGION. THIS WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS LATE TUESDAY MORNING THROUGH TUESDAY EVENING. TXZ171-172-183>190-202>204-217>219-228-191115- /O.UPG.KEWX.FW.A.0007.110419T1500Z-110420T0100Z/ /O.NEW.KEWX.FW.W.0015.110419T1500Z-110420T0100Z/ LLANO-BURNET-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-GILLESPIE- KENDALL-BLANCO-KINNEY-UVALDE-MEDINA-MAVERICK-ZAVALA-FRIO-DIMMIT- 121 PM CDT MON APR 18 2011 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 8 PM CDT TUESDAY... THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT FROM 10 AM TO 8 PM CDT TUESDAY. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. AN UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE EASTWARD ACROSS THE GREAT PLAINS CAUSING THE DRYLINE TO PUSH EASTWARD INTO SOUTH CENTRAL TEXAS ON TUESDAY. VERY DRY AND BREEZY WEST TO SOUTHWEST WINDS WILL MIX DOWN TO THE SURFACE BEHIND THE DRYLINE. RELATIVE HUMIDITIES ARE EXPECTED TO FALL TO NEAR 20 PERCENT ACROSS WESTERN PORTIONS OF THE REGION BY LATE TUESDAY MORNING. BY EARLY AFTERNOON...RELATIVE HUMIDITIES WILL FALL TO 20 TO 25 PERCENT ALONG HIGHWAY 281...AND INTO THE TEENS AND SINGLE DIGITS ACROSS WESTERN PORTIONS OF THE REGION. WEST TO SOUTHWEST WINDS OF 15 TO 20 MPH WILL COMBINE WITH THE VERY DRY CONDITIONS TO RESULT IN CRITICAL FIRE WEATHER CONDITIONS. WINDS WILL GRADUALLY DECREASE THROUGH THE EVENING BUT RELATIVE HUMIDITIES WILL BE SLOW TO RECOVER OVERNIGHT.. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS WEATHER CONDITIONS WILL PROMOTE FIRES THAT ARE DIFFICULT TO CONTROL ACROSS THE WARNED AREA. A RED FLAG WARNING IS COMPLETELY SEPARATE FROM A LOCAL BURN BAN WHICH IS ISSUED BY LOCAL OFFICIALS. && $$
3 follow-up statements
823 WWUS84 KEWX 191112 RFWEWX URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 612 AM CDT TUE APR 19 2011 ...A RED FLAG WARNING IS IN EFFECT FROM 10 AM CDT TODAY UNTIL 8 PM CDT TONIGHT FOR THE HILL COUNTRY...EDWARDS PLATEAU...AND RIO GRANDE PLAINS DUE TO BREEZY AND VERY DRY CONDITIONS... .AN UPPER LEVEL LOW PRESSURE SYSTEM MOVING EASTWARD ACROSS THE GREAT PLAINS WILL CAUSE THE DRYLINE TO PUSH EASTWARD INTO SOUTH CENTRAL TEXAS TODAY. VERY DRY AND BREEZY WEST TO SOUTHWEST WINDS OF 15 TO 20 MPH WILL MIX DOWN TO THE SURFACE BEHIND THE DRYLINE. AFTERNOON RELATIVE HUMIDITIES WILL FALL TO NEAR 25 PERCENT ALONG HIGHWAY 281...AND INTO THE SINGLE DIGITS ACROSS WESTERN PORTIONS OF THE REGION. THIS WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS LATE THIS MORNING THROUGH THIS EVENING. TXZ171-172-183>190-202>204-217>219-228-192300- /O.CON.KEWX.FW.W.0015.110419T1500Z-110420T0100Z/ LLANO-BURNET-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-GILLESPIE- KENDALL-BLANCO-KINNEY-UVALDE-MEDINA-MAVERICK-ZAVALA-FRIO-DIMMIT- 612 AM CDT TUE APR 19 2011 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM CDT THIS EVENING... AN UPPER LEVEL LOW PRESSURE SYSTEM WILL MOVE EASTWARD ACROSS THE GREAT PLAINS CAUSING THE DRYLINE TO PUSH EASTWARD INTO SOUTH CENTRAL TEXAS TODAY. VERY DRY AND BREEZY WEST TO SOUTHWEST WINDS WILL MIX DOWN TO THE SURFACE BEHIND THE DRYLINE. RELATIVE HUMIDITIES ARE EXPECTED TO FALL TO NEAR 20 PERCENT ACROSS WESTERN PORTIONS OF THE REGION BY LATE THIS MORNING. BY EARLY AFTERNOON...RELATIVE HUMIDITIES WILL FALL TO 20 TO 25 PERCENT ALONG HIGHWAY 281...AND INTO THE TEENS AND SINGLE DIGITS ACROSS WESTERN PORTIONS OF THE REGION. WEST TO SOUTHWEST WINDS OF 15 TO 20 MPH WILL COMBINE WITH THE VERY DRY CONDITIONS TO RESULT IN CRITICAL FIRE WEATHER CONDITIONS. WINDS WILL GRADUALLY DECREASE THROUGH THE EVENING BUT RELATIVE HUMIDITIES WILL BE SLOW TO RECOVER OVERNIGHT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS WEATHER CONDITIONS WILL PROMOTE FIRES THAT ARE DIFFICULT TO CONTROL ACROSS THE WARNED AREA. A RED FLAG WARNING IS COMPLETELY SEPARATE FROM A LOCAL BURN BAN WHICH IS ISSUED BY LOCAL OFFICIALS. && $$
706 WWUS84 KEWX 192057 RFWEWX URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 357 PM CDT TUE APR 19 2011 ...A RED FLAG WARNING CONTINUES IN EFFECT UNTIL 8 PM CDT TONIGHT FOR THE HILL COUNTRY...EDWARDS PLATEAU...AND RIO GRANDE PLAINS DUE TO BREEZY AND VERY DRY CONDITIONS... .A DRY-LINE MOVING ACROSS THE NORTHERN PORTION OF THE HILL COUNTRY AND THE UPPER RIO GRANDE PLAINS AREAS IS PRODUCING VERY DRY CONDITIONS AND WEST TO SOUTHWEST WINDS OF 10 TO 20 MPH. THIS WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS THROUGH THIS EVENING. TXZ171-172-183>190-202>204-217>219-228-200100- /O.CON.KEWX.FW.W.0015.000000T0000Z-110420T0100Z/ LLANO-BURNET-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-GILLESPIE- KENDALL-BLANCO-KINNEY-UVALDE-MEDINA-MAVERICK-ZAVALA-FRIO-DIMMIT- 357 PM CDT TUE APR 19 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... A RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS WEATHER CONDITIONS WILL PROMOTE FIRES THAT ARE DIFFICULT TO CONTROL ACROSS THE WARNED AREA. A RED FLAG WARNING IS COMPLETELY SEPARATE FROM A LOCAL BURN BAN WHICH IS ISSUED BY LOCAL OFFICIALS. && $$
264 WWUS84 KEWX 192123 CCA RFWEWX URGENT - FIRE WEATHER MESSAGE...CORRECTED NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 412 PM CDT TUE APR 19 2011 ...A RED FLAG WARNING CONTINUES IN EFFECT UNTIL 8 PM CDT TONIGHT FOR THE HILL COUNTRY...EDWARDS PLATEAU...AND RIO GRANDE PLAINS DUE TO BREEZY AND VERY DRY CONDITIONS... .A DRY-LINE MOVING ACROSS THE NORTHERN PORTION OF THE HILL COUNTRY AND THE UPPER RIO GRANDE PLAINS AREAS IS PRODUCING VERY DRY CONDITIONS AND WEST TO SOUTHWEST WINDS OF 10 TO 20 MPH. TXZ171-172-183>190-202>204-217>219-228-200100- /O.COR.KEWX.FW.W.0015.000000T0000Z-110420T0100Z/ LLANO-BURNET-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-GILLESPIE- KENDALL-BLANCO-KINNEY-UVALDE-MEDINA-MAVERICK-ZAVALA-FRIO-DIMMIT- 412 PM CDT TUE APR 19 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... A DRY-LINE MOVING ACROSS THE NORTHERN PORTION OF THE HILL COUNTRY AND THE UPPER RIO GRANDE PLAINS AREAS IS PRODUCING VERY DRY CONDITIONS AND WEST TO SOUTHWEST WINDS OF 10 TO 20 MPH. CRITICAL FIRE WEATHER CONDITIONS WILL REMAIN POSSIBLE OVER SOME AREAS THROUGH EARLY THIS EVENING. IN ADDITION TO THE BREEZY AND DRY CONDITIONS...ISOLATED THUNDERSTORMS WITH VERY GUSTY WINDS WILL BE POSSIBLE THIS EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS WEATHER CONDITIONS WILL PROMOTE FIRES THAT ARE DIFFICULT TO CONTROL ACROSS THE WARNED AREA. A RED FLAG WARNING IS COMPLETELY SEPARATE FROM A LOCAL BURN BAN WHICH IS ISSUED BY LOCAL OFFICIALS. && $$
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 4:19 AM CDT | Fire Weather Watch | EWX | Bandera, Blanco, Burnet, Dimmit, Edwards, Frio and 11 more | 9 hr |
Nearby
Red Flag Warnings in Texas, 2011Every red flag warning in 2011
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; radar from the NEXRAD Level II archive.