April 2016 Recap: Regional Flood/Severe Weather

[srainhoutx]

Quarter size hail now with intense lightning and torrential rainfall rates. Gauge nearing 10 inches of rainfall.

[unome]

Definitely a meso scale vortex (MCV) wrapping up in Waller, NW Harris and Montgomery counties. Looks to be almost stationary. More hail again as well.

funktop was popping green in Waller Co - looks like tropical season started early ?

http://www.thorntonweather.com/satellit ... unktop.php

HGX view shows the green pop http://www.ssd.noaa.gov/goes/east/wfo/h ... op-ft.html

[houstonia]

268
WUUS54 KHGX 180457
SVRHGX
TXC201-339-180600-
/O.NEW.KHGX.SV.W.0022.160418T0457Z-160418T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1157 PM CDT SUN APR 17 2016

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS...
NORTHWESTERN HARRIS COUNTY IN SOUTHEASTERN TEXAS...

* UNTIL 100 AM CDT

* AT 1157 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ADDICKS PARK
TEN...MOVING NORTH AT 25 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
TO ROOFS...SIDING...AND TREES.

* LOCATIONS IMPACTED INCLUDE...
TOMBALL...JERSEY VILLAGE...PINEHURST...SPRING BRANCH WEST...ELDRIDGE /
WEST OAKS...ADDICKS PARK TEN...SPRING BRANCH NORTH...THE WOODLANDS...
MISSION BEND...SPRING...STAGECOACH...CYPRESS...WILLOWBROOK...CARVERDALE...
WESTBRANCH...HOOKS AIRPORT...BRIAR FOREST...CINCO RANCH...ALIEF AND
FAIRBANKS / NORTHWEST CROSSING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

LARGE HAIL AND DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
LIGHTNING IS ONE OF NATURE'S LEADING KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.



LAT...LON 2968 9561 2977 9579 3004 9578 3020 9570
3013 9541
TIME...MOT...LOC 0457Z 187DEG 23KT 2983 9569

HAIL...1.00IN
WIND...60MPH

[unome]

deleted dbl post - here's a lightning array instead

http://lightning.nmt.edu/hstnlma/rt.php ... ty=1&zoom-

[unome]

MESOSCALE DISCUSSION 0409
NWS STORM PREDICTION CENTER NORMAN OK
1202 AM CDT MON APR 18 2016

AREAS AFFECTED...SOUTHEAST TX INCLUDING THE NORTH HALF OF THE
HOUSTON METRO

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 180502Z - 180700Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...IN ADDITION TO THE HEAVY RAIN THREAT PER WPC MPD
127...LOCALLY STRONG WIND GUSTS WILL BE POSSIBLE WITH THE SLOW
NORTHEASTWARD-MOVING CONVECTIVE COMPLEX ACROSS THE NORTH HALF OF THE
HOUSTON METRO INTO ADJACENT PARTS OF SOUTHEAST TX. GREATEST THREAT
FOR THESE ISOLATED STRONG WINDS SHOULD EXTEND FROM SOUTHERN GRIMES
AND HARRIS COUNTIES TO SAN JACINTO AND LIBERTY COUNTIES.

DISCUSSION...MOSAIC AND SINGLE-SITE RADAR IMAGERY SHOWED THE
EVOLUTION OF A WELL-ORGANIZED COMPACT CONVECTIVE SYSTEM WITH AN MCV
LOCATED NEAR THE BORDERS OF GRIMES/MONTGOMERY/HARRIS COUNTIES SINCE
0330-04Z. THE LEADING EDGE OF THIS SYSTEM EXTENDED FROM SOUTHWEST
MONTGOMERY TO WESTERN HARRIS COUNTIES...WHILE VELOCITY DATA PER
WSR-88D HGX RADAR INDICATED A REAR-INFLOW JET AND STRONG
SOUTHEASTERLY LOW-LEVEL WINDS ON THE LEADING EDGE. 50 KT WAS
DETECTED AT APPROXIMATELY 4500 FEET AGL IN NORTH-CENTRAL HARRIS
COUNTY AND UP TO 60 KT AT 55-60 KT AT APPROXIMATELY 7500 FEET IN
SOUTHWESTERN MONTGOMERY COUNTY.

GIVEN THE MCV POSSIBLY LOCALLY ENHANCING NEARBY WIND FIELDS AND THE
AFOREMENTIONED WIND SPEEDS...LOCALLY STRONG WIND GUSTS THROUGH THE
PROCESS OF PRECIPITATION LOADING WITHIN DOWNDRAFTS WILL BE POSSIBLE
THROUGH AT LEAST 07Z AS THE CONVECTIVE SYSTEM SHIFTS SLOWLY TO THE
NORTHEAST.

..PETERS/EDWARDS.. 04/18/2016


ATTN...WFO...HGX...

LAT...LON 29699566 30079577 30319598 30419593 30609557 30719509
30599491 30329477 30009476 29849506 29699566

[houstonia]

883
WGUS54 KHGX 180504
FFWHGX
TXC015-157-201-339-473-180800-
/O.NEW.KHGX.FF.W.0005.160418T0504Z-160418T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1204 AM CDT MON APR 18 2016

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
SOUTHERN WALLER COUNTY IN SOUTHEASTERN TEXAS...
SOUTHERN MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS...
NORTHWESTERN HARRIS COUNTY IN SOUTHEASTERN TEXAS...
EAST CENTRAL AUSTIN COUNTY IN SOUTHEASTERN TEXAS...
NORTH CENTRAL FORT BEND COUNTY IN SOUTHEASTERN TEXAS...

* UNTIL 300 AM CDT

* AT 1203 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS ON
GOING OR EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
KATY...TOMBALL...JERSEY VILLAGE...BROOKSHIRE...ELDRIDGE / WEST OAKS...
ADDICKS PARK TEN...MISSION BEND...HOCKLEY...SAN FELIPE...PATTISON...
CYPRESS...HOOKS AIRPORT...CINCO RANCH...MONAVILLE...ADDICKS AND
MEMORIAL.

LAT...LON 3013 9551 2970 9566 2978 9608 2991 9614
3013 9567

[DoctorMu]

funktop was popping green in Waller Co - looks like tropical season started early ?[/quote]

http://www.thorntonweather.com/satellit ... unktop.php[/quote]

HGX view shows the green pop http://www.ssd.noaa.gov/goes/east/wfo/h ... op-ft.html[/quote]

Amazing. The expansion is as impressive.

[houstonia]

763
WFUS54 KHGX 180507
TORHGX
TXC201-339-180545-
/O.NEW.KHGX.TO.W.0002.160418T0507Z-160418T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1207 AM CDT MON APR 18 2016

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* TORNADO WARNING FOR...
SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS...
NORTH CENTRAL HARRIS COUNTY IN SOUTHEASTERN TEXAS...

* UNTIL 1245 AM CDT

* AT 1207 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR SPLASHTOWN...OR NEAR SPRING...MOVING EAST AT
20 MPH.

HAZARD...TORNADO.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED.
DAMAGE TO ROOFS...WINDOWS...AND VEHICLES WILL OCCUR. TREE
DAMAGE IS LIKELY.

* LOCATIONS IMPACTED INCLUDE...
HUMBLE...SPRING...GREATER GREENSPOINT...ALDINE...KINGWOOD...THE
WOODLANDS...BUSH INTERCONTINENTAL AIRPORT...PORTER HEIGHTS...
SPLASHTOWN...SOUTHWESTERN ATASCOCITA...EAST LITTLE YORK / HOMESTEAD
AND LAKE HOUSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER
AND PROTECT YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW!

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW!



LAT...LON 2993 9551 3010 9556 3018 9529 3006 9521
2990 9523
TIME...MOT...LOC 0507Z 270DEG 18KT 3002 9548

TORNADO...RADAR INDICATED
HAIL...<.75IN

[unome]

Langham & Horsepen Creek getting close to top of banks also

http://www.harriscountyfws.org/

(select "channel status" instead of rainfall)

[unome]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1207 AM CDT MON APR 18 2016

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* TORNADO WARNING FOR...
SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS...
NORTH CENTRAL HARRIS COUNTY IN SOUTHEASTERN TEXAS...

* UNTIL 1245 AM CDT

* AT 1207 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR SPLASHTOWN...OR NEAR SPRING...MOVING EAST AT
20 MPH.

HAZARD...TORNADO.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED.
DAMAGE TO ROOFS...WINDOWS...AND VEHICLES WILL OCCUR. TREE
DAMAGE IS LIKELY.

* LOCATIONS IMPACTED INCLUDE...
HUMBLE...SPRING...GREATER GREENSPOINT...ALDINE...KINGWOOD...THE
WOODLANDS...BUSH INTERCONTINENTAL AIRPORT...PORTER HEIGHTS...
SPLASHTOWN...SOUTHWESTERN ATASCOCITA...EAST LITTLE YORK / HOMESTEAD
AND LAKE HOUSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER
AND PROTECT YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW!

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW!

&&

LAT...LON 2993 9551 3010 9556 3018 9529 3006 9521
2990 9523
TIME...MOT...LOC 0507Z 270DEG 18KT 3002 9548

TORNADO...RADAR INDICATED
HAIL...<.75IN

[Rip76]

Starting to get some flare ups near Pearland now.
Expanding Eastward.

[Texashawk]

Extraordinary event developing here. Not to sound alarmist, but has some echoes of Allison here. Who's staying up to monitor?

[unome]

DuPage Velocity Loop is insane http://weather.cod.edu/satrad/nexrad/in ... X-N0U-1-24

[srainhoutx]

New developing inflow off Matagorda Bay where training storms are beginning to fire raises an eyebrow. MCV may be maturing a bit. Need to carefully monitor Ft Bend and Central Harris Counties now. Brazoria and Galveston counties as well.

[unome]

Horsepen Creek now over banks at Trailside

http://www.harriscountyfws.org/

[srainhoutx]

Potential secondary MCV may be organizing to our West in Austin County. Looks like a boundary is draped just N of the I-10 Corridor generating a focal point for training.

[srainhoutx]

Update from Jeff:
Tremendous rainfall rates impacting large part of NW Harris County.



Since 700pm rainfall has averaged 4-9 inches over NW Harris County. Major flooding is resulting. Several channels are nearing bankfull or exceeding banks.



Flooding:



Upper Cypress west of US 290

Upper Spring Creek

South Mayde Creek

Horsepen Creek (house flooding likely)

Little Cypress Creek



Cluster of intense rainfall shifting ESE deeper into Harris County, still an additional 3-6 inches is possible anywhere in the county.



House flooding is likely over Addicks from the intense rainfall rates.

[jasons2k]

Pouring here, incredible lightning, no electricity...

[DoctorMu]

Potential secondary MCV may be organizing to our West in Austin County. Looks like a boundary is draped just N of the I-10 Corridor generating a focal point for training.

It stretches from La Grange to CLL. Incoming up here.

[tsb2107]

I thought this was supposed to be a Monday night into Tuesday morning event? Is this the big show or are we going to have additional rain event tomorrow all day?