May: Isolated Showers To End The Month

[Ptarmigan]

Don't want to sound like an ingrate ... but the recent rains have made a small improvement in the drought. But that slight positive trend only magnifies, I think, how horrific this drought has been. The Highland Lakes have gone up a bit. Lake Travis, here in Austin, raised its level by several feet.

Hey, any rain is welcomed. Just very happy this year's weather hasn't mimicked last year (or year before that or the year before or the ....)

Better than having no rain for sure. Rather take the rain over drought any day.

[srainhoutx]

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0754 AM CDT THU MAY 30 2013

VALID 301300Z - 311200Z

...THERE IS A MDT RISK OF SVR TSTMS OVER PARTS OF OK AND KS...

...THERE IS A SLGT RISK OF SVR TSTMS SURROUNDING THE MDT RISK
AREA...FROM THE SRN PLNS NNE INTO THE MID MO AND MID/UPR MS VLYS...

...SYNOPSIS...
NE WY UPR LOW WILL DRIFT SLOWLY E ACROSS SD THIS PERIOD AS ATTENDANT
NEGATIVE-TILT TROUGH SWEEPS NE ACROSS THE SRN PLNS/OZARKS
TODAY...AND NNE ACROSS THE LWR MO VLY/UPR MS VLY TNGT/EARLY FRI.
STRENGTHENED WNW FLOW IN WAKE OF TROUGH --- WITH 500 MB SPEEDS AOA
50 KTS --- WILL MAINTAIN LEE SFC TROUGH OVER THE CNTRL/SRN HIGH
PLNS...WHILE THE MAIN SFC LOW REMAINS NEARLY STNRY ALONG THE ND/SD
BORDER.

A WEAK COLD FRONT/WIND-SHIFT LINE ARCING SSW FROM THE ND/SD LOW
SHOULD ADVANCE ESE ACROSS CNTRL PARTS OF SD/NEB/KS THROUGH THE
DAY...WHILE FARTHER S...A DRY LINE WILL MIX E INTO SW KS...WRN
OK...AND W CNTRL TX BY EARLY EVE. THE TRUE SYNOPTIC WARM FRONT
ASSOCIATED WITH THE ND/SD LOW WILL REMAIN NEARLY STNRY ACROSS NRN
MN/LK SUPERIOR. BUT A SHALLOWER WARM FRONT-LIKE FEATURE ---
ESSENTIALLY THE BOUNDARY MARKING THE SW EDGE OF OVERNIGHT CONVECTIVE
OUTFLOW --- SHOULD EDGE NEWD THROUGH THE DAY ACROSS CNTRL/ERN
OK...PERHAPS REACHING PARTS OF AR AND SW MO BY EVE. THE
COLD FRONT/WIND-SHIFT...THE DRY LINE...AND THE SHALLOW WARM FRONTAL
FEATURE ALL MAY SERVE TO FOCUS STRONG TO SVR TSTM DEVELOPMENT LATER
TODAY INTO TNGT.

...S CNTRL PLNS THIS AFTN INTO TNGT...
ARGUABLY THE MOST INTENSE...ALTHOUGH CONDITIONAL...SVR THREAT
APPEARS TO BE THAT ASSOCIATED WITH ISOLD TO WDLY SCTD STORMS FORMING
ALONG THE DRY LINE IN RESPONSE TO STRONG SFC HEATING BENEATH SRN
FRINGE OF UPR TROUGH. GIVEN 40+ KT WNWLY DEEP SHEAR /WITH A SIZABLE
DIRECTIONAL COMPONENT/...CONTINUING PRESENCE OF RICH LOW-LVL
MOISTURE /PW AOA 1.25 INCHES WITH SFC DEWPOINTS IN THE UPR 60S F/
...AND A DEEP EML...SETUP COULD YIELD LONG-LIVED SUPERCELLS WITH
VERY LARGE HAIL...DMGG WIND...AND TORNADOES.

BASED ON CURRENT AND FCST AFTN SFC CONDITIONS...THE AREA MOST LIKELY
TO EXPERIENCE SUCH ACTIVITY WOULD APPEAR TO EXTEND FROM S CNTRL KS
THROUGH CNTRL/ERN OK AND WRN AR INTO N TX. IF DISCRETE SUPERCELLS DO
FORM...AND...MORE IMPORTANTLY...REMAIN SUSTAINED...THE
WIND/THERMODYNAMIC SETUP LIKELY WILL BE MORE THAN SUFFICIENT FOR A
COUPLE STRONG TORNADOES. THIS THREAT MAY MAXIMIZE NEAR SHALLOW WARM
FRONTAL FEATURE OVER CNTRL/ERN OK...WHERE SFC FLOW IS LIKELY TO
REMAIN SLIGHTLY BACKED. IN ADDITION...IF STORMS LINGER INTO THE
EVE...THEY WILL FIND THEMSELVES IN AN ENVIRONMENT OF INCREASING
LOW-LVL SHEAR AS THE LLJ NOT ONLY STRENGTHENS NOCTURNALLY...BUT ALSO
IN RESPONSE TO THE APPROACH OF UPSTREAM JET STREAK NOW OVER THE GRT
BASIN.

UNCERTAINTIES DO REMAIN REGARDING THE COVERAGE OF STORMS IN THE AREA
OF GREATEST BUOYANCY AS /1/ HEIGHTS WILL RISE THROUGH THE DAY
/ESPECIALLY FROM CNTRL OK SWD/ IN WAKE OF PASSING NEGATIVE-TILT
TROUGH...AND /2/ EML CAP WILL BE STRONG...ESPECIALLY S OF THE RED
RVR. NEVERTHELESS...GIVEN THE HIGH-END HAIL/TORNADO POTENTIAL WITH
ANY SUSTAINED STORMS THAT DO FORM...A MODERATE RISK SEEMS WARRANTED
ATTM.

...MID/UPR MS VLY THIS AFTN/EVE...
MODERATE SFC HEATING SHOULD OCCUR OVER PARTS OF MO...IA...IL...AND
WI TODAY...AHEAD OF REMNANT MID/HIGH-LEVEL CONVECTIVE DEBRIS. REGION
WILL LIE ON ERN FRINGE OF DCVA ASSOCIATED WITH PROGRESSIVE
NEGATIVE-TILT TROUGH. WITH MORNING RAOB AND VWP DATA SHOWING
MODERATE TO STRONG...DEEP SSW FLOW ALREADY IN PLACE ACROSS
REGION...AND WITH WIND FIELDS LIKELY TO INCREASE SOMEWHAT
TODAY...SETUP MAY PROVE FAVORABLE FOR THE DEVELOPMENT OF BROKEN
BANDS OF STORMS ORIENTED ROUGHLY PARALLEL TO THE DEEP FLOW. WITH
AMPLE CLOUD-LAYER SHEAR PRESENT FOR ORGANIZED/SUSTAINED
UPDRAFTS...POTENTIAL WILL EXIST FOR SMALL SCALE LEWPS/BOWS WITH DMGG
WIND AND PERHAPS A COUPLE TORNADOES DESPITE COMPARATIVELY MODEST
BUOYANCY /SBCAPE 1000-2000 J PER KG/.

...N CNTRL PLNS/MID MO VLY THIS AFTN...
WDLY SCTD STORMS MAY FORM WITH DAYTIME HEATING ALONG WEAK COLD FRONT
OVER PARTS OF THE ERN DAKOTAS...NEB...WRN IA AND SW MN...WHERE DEEP
ASCENT WILL BE AUGMENTED BY DCVA AHEAD OF UPR TROUGH. WHILE WIND
PROFILES WILL BE FAIRLY WEAK...THEY WILL BE SUFFICIENT FOR A FEW
ORGANIZED/SUSTAINED STORMS WITH A RISK FOR HAIL AND PERHAPS A BRIEF
TORNADO OR TWO GIVEN COOL MID-LVL TEMPS.

..CORFIDI/BOTHWELL.. 05/30/2013

[srainhoutx]

For our neighbors across the Eastern half of Oklahoma. Keep an eye and ear on the weather today.

DAY 1 CONVECTIVE OUTLOOK CORR 1
NWS STORM PREDICTION CENTER NORMAN OK
1156 AM CDT FRI MAY 31 2013

VALID 311630Z - 011200Z

...THERE IS A MDT RISK OF SVR TSTMS THIS AFTERNOON AND EVENING
ACROSS PARTS OF CNTRL OK...SERN KS...AND SWRN MO...

...THERE IS A SLGT RISK OF SVR TSTMS OVER PARTS OF THE GREAT PLAINS
INTO UPPER MIDWEST...

CORRECTED FOR TYPOS

...REGIONAL SEVERE WEATHER OUTBREAK POSSIBLE TODAY OVER PARTS OF
CENTRAL/EASTERN OK...SOUTHEAST KS...AND SOUTHWEST MO. VERY LARGE
HAIL...WIDESPREAD DAMAGING WINDS...AND A FEW STRONG/VIOLENT
TORNADOES ARE POSSIBLE...

...OK/KS/MO...
ANOTHER VERY VOLATILE ENVIRONMENT IS IN PLACE ACROSS PARTS OF THE
SOUTHERN PLAINS AND MID MS VALLEY TODAY. WIDESPREAD VERY STEEP MID
LEVEL LAPSE RATES AND DEWPOINTS IN THE UPPER 60S/LOWER 70S ARE
RESULTING IN THE POTENTIAL FOR AFTERNOON MLCAPE VALUES OVER 4000
J/KG. THIS AIR MASS IS CURRENTLY CAPPED...AND THE CAP SHOULD
RESTRAIN DEEP CONVECTION THROUGH MUCH OF THE DAY ALLOWING STRONG
HEATING.

BY MID/LATE AFTERNOON...A SHORTWAVE TROUGH INDICATED IN WATER VAPOR
IMAGERY OVER THE TX PANHANDLE...ALONG WITH A SECOND AND STRONGER
TROUGH OVER CO...WILL APPROACH THE REGION. THIS WILL RAPIDLY WEAKEN
THE CAP AND ALLOW EXPLOSIVE THUNDERSTORM DEVELOPMENT ALONG THE
DRYLINE OVER WEST-CENTRAL OK...AND ALONG THE COLD FRONT EXTENDING
FROM CENTRAL OK INTO SOUTHWEST MO. DEEP LAYER EFFECTIVE SHEAR
VALUES ARE FAVORABLE FOR SUPERCELL STORMS CAPABLE OF VERY LARGE
HAIL...DAMAGING WINDS...AND TORNADOES. SHEAR VECTORS PERPENDICULAR
TO THE N-S DRYLINE OVER CENTRAL OK WILL FAVOR DISCRETE STORM
STRUCTURES. ALL 12Z MODEL GUIDANCE INDICATES RAPID INTENSIFICATION
OF THE LOW LEVEL JET OVER CENTRAL OK BY EVENING AS THE UPPER TROUGH
APPROACHES. GIVEN THESE PARAMETERS...IT APPEARS THE THREAT OF A FEW
STRONG/VIOLENT TORNADOES ARE IN PLACE. HAVE INCREASED SEVERE
PROBABILITIES OVER THIS REGION...AND PORTIONS OF CENTRAL/EASTERN OK
WILL BE CONSIDERED FOR AN UPGRADE TO HIGH RISK AT 20Z IF
SHORTER-TERM MESOSCALE MODELS MAINTAIN THIS SCENARIO.

DURING THE EVENING...NUMEROUS THUNDERSTORMS ARE EXPECTED TO CONGEAL
INTO A FAST-MOVING MCS THAT TRACKS NORTHEASTWARD ACROSS NORTHEAST OK
INTO SOUTHWEST MO. HIGH CAPE VALUES AND AN INCREASING LOW LEVEL JET
WILL PROMOTE THE POTENTIAL FOR WIDESPREAD WIND DAMAGE...ALONG WITH
LARGE HAIL AND ISOLATED TORNADOES.

...IA/MN/WI...
AN UPPER LOW IS PRESENT THIS MORNING OVER WESTERN SD...WITH MULTIPLE
SHORTWAVE TROUGHS ROTATING NORTHWARD ACROSS IA/MN. STRONG DAYTIME
HEATING IS OCCURRING AHEAD OF THE SHORTWAVE TROUGHS OVER PARTS OF
MN/WI/IA WHERE MODERATE AFTERNOON CAPE IS EXPECTED. SCATTERED
THUNDERSTORMS ARE EXPECTED TO FORM BY MID AFTERNOON OVER MN/IA AND
TRACK NORTHEASTWARD. A FEW OF THESE STORMS COULD BE SUPERCELLULAR
WITH A RISK OF HAIL/DAMAGING WINDS OR AN ISOLATED TORNADO.

...IL/IND...
AN ONGOING CLUSTER OF THUNDERSTORMS IN THE STL AREA MAY RE-INTENSIFY
THIS AFTERNOON AS IT TRACKS INTO AN INCREASINGLY MOIST/UNSTABLE AIR
MASS OVER IL/IND. IF THIS OCCURS...LOCALLY DAMAGING WINDS AND HAIL
WILL BE POSSIBLE.

..HART.. 05/31/2013

The attachment 05312013 SPC day1otlk_1630.gif is no longer available

[spadilly]

Thoughts and prayers again today for Oklahoma.
Looks like a PDS watch is coming:

[spadilly]

MESOSCALE DISCUSSION 0907
NWS STORM PREDICTION CENTER NORMAN OK
0240 PM CDT FRI MAY 31 2013

AREAS AFFECTED...MOST OF OK

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 311940Z - 312115Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...PDS TORNADO WATCH WILL BE ISSUED BY 21Z. ISOLATED TO
SCATTERED DISCRETE SUPERCELLS SHOULD FORM ALONG DRYLINE BETWEEN
21-23Z WITH PRIMARY INITIAL THREAT OF VERY LARGE HAIL AND ISOLATED
SEVERE WINDS. TORNADO RISK WILL INCREASE TOWARDS 00Z WITH AN
EXPECTATION OF A FEW SIGNIFICANT TORNADOES.

DISCUSSION...19Z SURFACE ANALYSIS PLACED A QUASI-STATIONARY FRONT
FROM GRANT TO CUSTER COUNTIES WITH A DRYLINE DRAPED S/SWWD INTO THE
LOW ROLLING PLAINS OF NWRN TX. SURFACE TEMPERATURES HAVE NOW
BREACHED 100 DEG F ALONG THE RED RIVER IN SWRN OK/NWRN
TX...RESULTING IN MINIMAL MLCIN PER MODIFIED 18Z OUN RAOB. CU JUST
AHEAD OF THE DRYLINE HAS BECOME MORE AGITATED IN LATEST VISIBLE
SATELLITE IMAGERY AND SHOULD CONTINUE TO GROW WITH GLANCING
INFLUENCE OF A SHORTWAVE IMPULSE OVER THE CNTRL HIGH PLAINS. THIS
SHOULD RESULT IN TSTM INITIATION BY 21Z.

STRONG EFFECTIVE SHEAR WILL PROMOTE SUPERCELLS WITH AN INITIAL
PRIMARY RISK OF VERY LARGE HAIL. WITH A PLUME OF 73-74 DEG F SURFACE
DEW POINTS REMAINING ACROSS CNTRL OK BENEATH THE CAPPING INVERSION
NOTED IN 18Z OUN RAOB...AND AS THE LLJ INTENSIFIES BY 00Z...TORNADO
THREAT WILL INCREASE SUBSTANTIALLY. SOME OF THESE WILL LIKELY BE
SIGNIFICANT...ESPECIALLY ALONG THE I-35 CORRIDOR.

..GRAMS/HART.. 05/31/2013

[srainhoutx]

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0302 PM CDT FRI MAY 31 2013

VALID 312000Z - 011200Z

...THERE IS A MDT RISK OF SVR TSTMS FROM CNTRL OK INTO SWRN MO...

...THERE IS A SLGT RISK OF SVR TSTMS FROM FAR NRN TX INTO NERN MN
AND WI...

...OK...SERN KS INTO SWRN MO...
STORMS ARE BEGINNING TO FORM OVER SERN KS ALONG THE COLD FRONT...AS
WELL AS ALONG THE OUTFLOW BOUNDARY INTO W CNTRL MO. 18Z SGF SOUNDING
SHOWED A LOADED GUN PROFILE WITH STEEP MIDLEVEL LAPSE RATES AND A
VERY DEEP MOIST BOUNDARY LAYER AND A SUPERCELL TORNADO HODOGRAPH.
WITH LIFTED INDICIES OF -10 TO -12...A COUPLE STRONG TORNADOES WILL
BE POSSIBLE IN ADDITION TO VERY LARGE HAIL.

FARTHER S INTO OK...THE 18Z OUN SOUNDING SHOWED A PRONOUNCED CAPPING
INVERSION...WITH A VERY MOIST AND DEEPENING BOUNDARY LAYER WITH
PRECIPITABLE WATER AROUND 1.50 INCHES. OK MESONET OBSERVATIONS
CONTINUE TO SHOW DEWPOINTS HOLDING IN THE LOWER 70S F WITH EXTREME
INSTABILITY IN PLACE.

HIGHER BASED CU HAVE RECENTLY FORMED OVER NW TX AND SWRN OK WHERE
TEMPERATURES WERE NEARING 100 F...AND THE GREATEST PRESSURE FALLS
ARE CENTERED IN THIS REGION AS WELL. MODELS ALSO CONTINUE TO SHOW
CYCLOGENESIS THROUGH THE EVENING...WITH WINDS OVER CNTRL OK BECOMING
MORE BACKED WITH TIME. THIS WILL HAVE THE EFFECT OF ENLARGING
HODOGRAPHS AND SRH VALUES. THIS WILL ALSO LIKELY PULL THE STATIONARY
BOUNDARY...NOW FROM N CNTRL INTO WRN OK...SWD TO NEAR I-40. CELLS
THAT FORM OVER SWRN OR W CNTRL OK WILL MOVE E WITH A VERY HIGH
THREAT OF GIANT HAIL AND A FEW STRONG TO VIOLENT TORNADOES. ONE
CAVEAT IS INITIAL LCL HEIGHTS IN THE HOTTER AIR...AND POTENTIAL
OUTFLOW MAGNITUDE. HOWEVER...THE EXTREMELY FAVORABLE SUPERCELL
ENVIRONMENT IS EXPECTED TO KEEP STORMS MAINLY CELLULAR...HELPING TO
COUNTERACT ANY NEGATIVE OUTFLOW EFFECTS.

LATER IN THE EVENING...A SEVERE MCS AND/OR ADDITIONAL SUPERCELLS ARE
STILL LIKELY ACROSS MUCH OF NRN AND NERN OK INTO SWRN MO...WITH
DAMAGING WINDS AND A FEW TORNADOES.

...ERN MN...WI...ERN IA...
EXPANDED THE SLIGHT RISK FARTHER W INTO MN AS STORMS CONTINUE TO
FORM W OF THE MS RIVER WHERE DESTABILIZATION CONTINUES AND WITH
COOLING ALOFT OVERSPREADING THE WARM SECTOR. COOL TEMPERATURES ALOFT
AND SUFFICIENT DEEP LAYER SHEAR WILL FAVOR SEVERE HAIL. STORMS
SHOULD PERSIST WITH A SWD EXTENSION LIKELY INTO IA BY LATE
AFTERNOON/EARLY EVENING.

..JEWELL.. 05/31/2013

[srainhoutx]

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 262
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT FRI MAY 31 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
CENTRAL AND NORTHEAST OKLAHOMA

* EFFECTIVE THIS FRIDAY AFTERNOON FROM 330 PM UNTIL MIDNIGHT CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

* PRIMARY THREATS INCLUDE...
SEVERAL INTENSE TORNADOES LIKELY
NUMEROUS VERY LARGE HAIL EVENTS TO 4 INCHES IN DIAMETER LIKELY
NUMEROUS DAMAGING WIND GUSTS LIKELY WITH SEVERAL SIGNIFICANT
GUSTS TO 80 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF
BARTLESVILLE OKLAHOMA TO 30 MILES EAST OF WICHITA FALLS TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 260...WW 261...

DISCUSSION...AN EXTREMELY UNSTABLE AIR MASS HAS DEVELOPED ACROSS
MUCH OF CENTRAL/EASTERN OK THIS AFTERNOON. THIS WILL LIKELY RESULT
IN RAPID DEVELOPMENT OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING ALONG THE DRYLINE OVER WEST-CENTRAL OK...AND ALONG A WEAK
BOUNDARY EXTENDING NORTHEASTWARD INTO NORTHEAST OK. DISCRETE
SUPERCELLS CAPABLE OF EXTREMELY LARGE HAIL AND DAMAGING TORNADOES
ARE POSSIBLE. DAMAGING WINDS WILL BECOME AN INCREASING THREAT
THROUGH THE EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 26025.


...HART

[tireman4]

It could get really bumpy up there today and tonight. For our neighbors to the north, keep a weather eye to the sky.

[srainhoutx]

Heavy hearts for our Houston Firefighters this afternoon. Our thoughts and prayers are with the families and our fallen heroes.

[srainhoutx]

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
219 PM CDT JUN 3 2013

...RECORD COLD TEMPERATURES GREETED THE MONTH OF MAY...
...THIRD CONSECUTIVE MONTH WITH BELOW AVERAGE TEMPERATURES...

MAY 2013 STARTED OUT ON A VERY COLD NOTE. ON MAY 3RD...THE CITY OF
GALVESTON RECORDED A LOW TEMPERATURE OF 50 DEGREES. THIS WAS A DAILY
AND MONTHLY LOW TEMPERATURE RECORD THAT BESTED THE PREVIOUS MONTHLY
LOW RECORD OF 52 SET ON MAY 4TH OF 1954. THE CITY OF HOUSTON ALSO
ESTABLISHED THREE NEW DAILY MINIMUM TEMPERATURE RECORDS ON THE
3RD...4TH...AND 6TH...WITH A NEW MONTHLY MINIMUM TEMPERATURE RECORD
OF 42 SET ON MAY 4TH. THE 42 DEGREES RECORDED ON THE 4TH IS NOW THE
COLDEST TEMPERATURE EVER RECORDED IN THE MONTH OF MAY FOR THE CITY
OF HOUSTON. COLLEGE STATION ALSO RECORDED THREE NEW DAILY
TEMPERATURE RECORDS ON THE 3RD...4TH...AND 6TH. COLLEGE STATION ALSO
TIED THE COLDEST TEMPERATURE FOR THE MONTH OF MAY WHEN THE
TEMPERATURE DROPPED TO 42 DEGREES ON THE 4TH.

THE MONTH OF MAY IS THE THIRD CONSECUTIVE MONTH IN 2013 WITH BELOW
NORMAL TEMPERATURES FOR THE CITIES OF HOUSTON AND COLLEGE STATION.
WHEN WAS THE LAST TIME THIS PHENOMENA OCCURRED? IT ACTUALLY HAPPENED
RATHER RECENTLY DURING THE WINTER OF 2009 AND 2010...OR MORE
SPECIFICALLY THE MONTHS OF DECEMBER 2009...JANUARY 2010...FEBRUARY
2010...AND MARCH 2010. SO HOW COLD HAS IT BEEN OVER THE LAST THREE
MONTHS? THE CITY OF HOUSTON HAD AN AVERAGE TEMPERATURE OF 67.8
DEGREES WHICH IS THE 30TH COOLEST CLIMATOLOGICAL SPRING IN HISTORY
OF THE CITY. THE COOLEST MARCH THROUGH MAY WAS 64.3 DEGREES IN 1931.

THE FOLLOWING TABLE LISTS THE TOP 30 COOLEST AVERAGE TEMPERATURES FOR
MARCH THROUGH MAY FOR THE CITY OF HOUSTON.


RANK VALUE YEAR RANK VALUE YEAR

1 64.3 1931 16 67.2 1969
2 65.3 1983 17 67.3 1947
3 65.7 1915 18 67.4 1977
4 65.9 1926 19 67.5* 1988
5 66.0* 1895 20 67.5 1912
6 66.0 1970 21 67.6* 1932
7 66.7* 1971 22 67.6 1928
8 66.7 1976 23 67.6 1937
9 66.8 1993 24 67.6 1892
10 66.9 1913 25 67.7* 1917
11 67.0* 1978 26 67.7 1997
12 67.0 1973 27 67.7 1898
13 67.1* 1914 28 67.7 1987
14 67.1 1952 29 67.7 1960
15 67.2* 1924 30 67.8 2013


* NOTE...THESE RECORDS ARE TIED WITH AT LEAST ONE OTHER PREVIOUS
YEAR.

THE FOLLOWING TABLE LISTS THE DEPARTURES FROM NORMAL OF THE AVERAGE
TEMPERATURES FOR THE FOUR FIRST-ORDER CLIMATE STATIONS.


STN MAY 2013 APR 2013 MAR 2013

CLL -1.8 -2.1 -0.9
IAH -1.9 -2.9 -1.5
HOU -2.1 -2.0 -0.8
GLS -3.2 -2.3 +0.3


THE FOLLOWING TABLE SHOWS THE LAST TIME THERE WERE THREE MONTHS OF
BELOW NORMAL TEMPERATURES OF -0.5 DEGREES OR MORE.


STN DATES

CLL DEC 2009 - MAR 2010
IAH DEC 2009 - MAR 2010
HOU DEC 2009 - MAR 2010
GLS* NOV 2010 - FEB 2011


* NOTE...GLS ONLY HAD TWO CONSECUTIVE MONTHS OF BELOW NORMAL AVERAGE
TEMPERATURES DURING THIS PERIOD.

POSSIBLY HOW MUCH RAINFALL HAS REPLENISHED AREA RESERVOIRS IN
SOUTHEAST TEXAS? THE FOLLOWING TABLE LISTS DATA FROM
HTTP://WWW.WATERDATAFORTEXAS.ORG/RESERVOIRS/STATEWIDE.


RESERVOIR DATE AND PERCENTAGE FULL

HOUSTON COUNTY LAKE MAY 30TH - 98.1 PERCENT FULL
APR 30TH - 99.3 PERCENT FULL

LAKE LIVINGSTON MAY 30TH - 100 PERCENT FULL
APR 30TH - 100 PERCENT FULL

LAKE CONROE MAY 30TH - 88.8 PERCENT FULL
APR 30TH - 85.1 PERCENT FULL

LAKE SOMERVILLE MAY 30TH - 85.0 PERCENT FULL
APR 30TH - 85.1 PERCENT FULL

LAKE HOUSTON MAY 30TH - 100 PERCENT FULL
APR 30TH - 100 PERCENT FULL


THE FOLLOWING TABLE LISTS THE ALL TIME RECORD LOWS FOR MAY FOR THE
CITIES OF GALVESTON...HOUSTON...AND COLLEGE STATION. NOTE THAT THE
STATION IDENTIFIER IS USED TO REPRESENT PREVIOUS CITY SITES AS WELL.


...ALL TIME RECORD LOWS FOR MAY...
SITE OLD RECORD NEW RECORD

CLL 42 IN 1954 42 IN 2013
IAH 44 IN 1978 42 IN 2013
GLS 52 IN 1903 50 IN 2013


THREE RECORD LOWS WERE SET IN THE MONTH OF MAY FOR THE CITIES OF
HOUSTON AND COLLEGE STATION. THE FOLLOWING TABLE SHOWS THE LAST TIME
AT LEAST THREE RECORD LOWS WERE SET FOR ONE MONTH AT BOTH IAH AND CLL.


SITE YEAR DATES

CLL 2002 MAR 4 - 6
IAH* 2004 AUG 13 - 16


* NOTE THAT FOUR RECORD LOWS HAVE BEEN SET SO FAR THIS YEAR AT IAH.
THE LAST TIME THIS OCCURRED WAS IN 2004 AND 2000.

NOW FOR THE GENERAL MONTHLY CLIMATE DATA. THE FOLLOWING TABLE LISTS
THE MONTHLY CLIMATE DATA FOR THE FIRST AND SECOND-ORDER CLIMATE SITES
IN THE NWS HOUSTON/GALVESTON COUNTY WARNING AREA FOR THE MONTH OF
MAY.


SITE AVG AVG AVG DEP RAIN DEP
HIGH LOW MONTH

IAH 85.0 66.0 75.5 -1.4 1.02 -4.07
GLS 79.9 69.5 74.7 -2.9 1.12 -3.20
CLL 85.3 64.4 74.8 -1.4 6.73 +2.40
HOU 83.5 67.2 75.4 -1.6 2.96 -1.79
CXO 84.2 61.4 72.8 -1.6 2.50 -2.42
UTS 84.5 63.7 74.1 -2.0 7.28 +2.74
DWH 84.9 64.5 74.7 -1.1 1.00 -3.77
SGR 84.5 66.1 75.3 -1.1 2.76 -1.87
LBX 82.9 65.2 74.0 -1.5 0.97 -3.06
PSX 83.8 70.0 76.9 -0.2 0.55 -3.66
LVJ 82.3 66.0 74.2 -1.9 1.90 -2.64
HGX 82.2 66.1 74.1 -1.0 2.14 -2.51

A MORE COMPLETE CLIMATE SUMMARY FOR APRIL 2013 WILL BE ISSUED BY
JUNE 7TH. AT THAT TIME...TEMPERATURES AND RAINFALL FOR THE CO-OP
OBSERVERS WILL BE INCLUDED.