Message:22938 In: NEWS.WW
From: LU9DCEDate: Sat, 23 May 26 09:30:00 Z
Newsgroups: NEWS.WW
Subject: STORM PREDICTION CENTER 23-MAY
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PYTHON SCHEDULED NEWSLETTERS (PSN)
COPYRIGHT 2026 - EDUARDO A. CASTILLO
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SPC - NO WATCHES ARE VALID AS OF SAT MAY 23 08:57:02 UTC 2026
NO WATCHES ARE VALID AS OF SAT MAY 23 08:57:02 UTC 2026.
========================================
SPC MD 834
MD 0834 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR PARTS OF
SOUTH-CENTRAL TX TO THE MIDDLE TX COAST
MESOSCALE DISCUSSION 0834
NWS STORM PREDICTION CENTER NORMAN OK
0200 AM CDT SAT MAY 23 2026
AREAS AFFECTED...PARTS OF SOUTH-CENTRAL TX TO THE MIDDLE TX COAST
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 230700Z - 230900Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...AN ISOLATED STRONG-SEVERE GUST (55-65 MPH) CANNOT BE RULED
OUT WITH AN EVOLVING BAND OF STORMS DURING THE NEXT COUPLE HOURS.
DISCUSSION...A SMALL BAND OF THUNDERSTORMS HAS EVOLVED ABOUT 50
MILES SOUTHEAST OF SAN ANTONIO TX, WITH RECENT ECHO TOPS APPROACHING
45-50 KFT AGL. THE PRE-CONVECTIVE ENVIRONMENT IS CHARACTERIZED BY
FULLY MODIFIED GULF MOISTURE (MIDDLE/UPPER 70S DEWPOINTS) AND STEEP
MIDLEVEL LAPSE RATES (AS SAMPLED BY THE CRP 00Z SOUNDING). THIS,
COMBINED WITH TEMPERATURES HOLDING IN THE UPPER 70S F YIELDED A
CORRIDOR OF 3000 J/KG MLCAPE TO THE MIDDLE TX COAST. THIS BUOYANCY
AND AROUND 30 KT OF LINE-ORTHOGONAL EFFECTIVE SHEAR MAY SUPPORT THE
CONTINUATION OF THIS CONVECTIVE BAND TO THE COAST, WITH AN
ASSOCIATED RISK OF AN ISOLATED STRONG-SEVERE GUST (55-65 MPH).
HOWEVER, WEAK FORCING FOR ASCENT AND SOME LOW-LEVEL INHIBITION
SHOULD TEND TO LIMIT CONVECTIVE INTENSITY/ORGANIZATION AND THE
OVERALL SEVERE RISK.
.WEINMAN/SMITH.. 05/23/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...HGX...CRP...EWX...
LAT...LON 28309772 28589807 29049754 29549742 29679713 29679659
29499611 29079594 28529616 28169658 28099697 28309772
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN
READ MORE
========================================
SPC MAY 23, 2026 0600 UTC DAY 1 CONVECTIVE OUTLOOK
SPC 1200Z DAY 1 OUTLOOK
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1227 AM CDT SAT MAY 23 2026
VALID 231200Z - 241200Z
..THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE SOUTHERN PLAINS...WESTERN AND CENTRAL GULF COAST...FROM GEORGIA
INTO SOUTH CAROLINA...AND ACROSS OHIO...
..SUMMARY...
THUNDERSTORMS WITH ISOLATED SEVERE WIND GUSTS AND HAIL WILL BE
POSSIBLE THIS AFTERNOON AND EVENING ACROSS PARTS OF THE SOUTHERN
PLAINS. A FEW STRONG WIND GUSTS AND AN ISOLATED TORNADO THREAT WILL
BE POSSIBLE FROM SOUTHEAST TEXAS INTO SOUTHERN LOUISIANA. A FEW
STRONG GUSTS MAY ALSO OCCUR FROM GEORGIA INTO SOUTH CAROLINA. AN
ISOLATED TORNADO THREAT IS ALSO EXPECTED IN PARTS OF OHIO.
..SOUTHERN HIGH PLAINS...
AN UPPER-LEVEL TROUGH WILL MOVE EASTWARD TODAY ACROSS THE GREAT
PLAINS. AT THE SURFACE, A BROAD MOIST SECTOR WILL BE IN PLACE ACROSS
THE SOUTHERN PLAINS WHERE DEWPOINTS WILL BE MOSTLY IN THE 60S F. IN
RESPONSE, AN AXIS OF MODERATE INSTABILITY WILL DEVELOP BY AFTERNOON
FROM THE TEXAS PANHANDLE SOUTHWARD INTO WEST TEXAS. SCATTERED
THUNDERSTORMS ARE EXPECTED TO FORM DURING THE MID TO LATE AFTERNOON
NEAR THIS AXIS OF INSTABILITY. RAP FORECAST SOUNDINGS IN THE TEXAS
PANHANDLE IN THE LATE AFTERNOON HAVE MLCAPE NEAR 1500 J/KG AND 0-6
KM SHEAR IN THE 25 TO 35 KNOT RANGE, WITH 700-500 MB LAPSE RATES
AROUND 8 C/KM. THIS SHOULD SUPPORT A MARGINAL SEVERE THREAT.
ISOLATED LARGE HAIL AND A FEW STRONG WIND GUSTS WILL BE POSSIBLE.
..SOUTH-CENTRAL AND SOUTHEAST TEXAS/SOUTHERN LOUISIANA...
IN THE COASTAL AREAS OF THE WESTERN AND CENTRAL GULF, VERY MOIST AIR
WILL BE IN PLACE. SURFACE DEWPOINTS IN THE LOWER TO MID 70S F WILL
CONTRIBUTE TO MODERATE INSTABILITY BY MIDDAY. THUNDERSTORMS WILL
FORM ALONG SEA BREEZE BOUNDARIES DURING THE EARLY TO MID AFTERNOON.
A FEW SEVERE WIND GUSTS AND A BRIEF TORNADO WILL BE POSSIBLE.
FURTHER WEST INTO PARTS OF SOUTH-CENTRAL TEXAS, MODERATE TO STRONG
INSTABILITY IS FORECAST BY AFTERNOON WITH MLCAPE PEAKING IN THE 2500
TO 3500 J/KG RANGE. THIS, COMBINED WITH MODERATE DEEP-LAYER SHEAR,
MAY SUPPORT ISOLATED SEVERE STORM DEVELOPMENT THIS AFTERNOON. THE
PRIMARY THREATS WOULD BE FOR HAIL AND ISOLATED SEVERE WIND GUSTS.
..GEORGIA/SOUTH CAROLINA...
A MID-LEVEL SHORTWAVE TROUGH WILL MOVE ACROSS THE SOUTHEAST TODAY.
AT THE SURFACE, MOIST AIR WILL BE IN PLACE FROM THE GULF COAST
STATES INTO THE CAROLINAS, WHERE MODERATE INSTABILITY WILL DEVELOP
BY MIDDAY. DURING THE AFTERNOON, SCATTERED THUNDERSTORMS WILL FORM
FROM GEORGIA INTO SOUTH CAROLINA. AS INSTABILITY INCREASES DURING
THE DAY, LOW-LEVEL LAPSE RATES WILL BECOME STEEP. THIS SHOULD BE
SUFFICIENT FOR AN ISOLATED POTENTIAL FOR SEVERE WIND GUSTS.
..OHIO...
SOUTHWESTERLY MID-LEVEL FLOW WILL BE IN PLACE OVER THE OHIO VALLEY
AND LOWER GREAT LAKES TODAY. AT THE SURFACE, AN AXIS OF LOW-LEVEL
MOISTURE WILL BE LOCATED FROM EASTERN KENTUCKY INTO CENTRAL AND
NORTHERN OHIO, WHERE DEWPOINTS WILL BE IN THE MID TO UPPER 60S F. AS
INSTABILITY INCREASES DURING THE DAY, SCATTERED THUNDERSTORMS ARE
EXPECTED TO DEVELOP AND MOVE NORTHEASTWARD ACROSS THE INSTABILITY
CORRIDOR. RAP FORECAST SOUNDINGS IN CENTRAL OHIO AT 21Z HAVE 0-6 KM
SHEAR NEAR 30 KNOTS WITH 0-3 KM STORM-RELATIVE HELICITY AROUND 150
M2/S2. THIS COULD BE ENOUGH FOR AN ISOLATED TORNADO THREAT.
.BROYLES/CHALMERS.. 05/23/2026
READ MORE
========================================
SPC MAY 23, 2026 0600 UTC DAY 2 CONVECTIVE OUTLOOK
SPC 0600Z DAY 2 OUTLOOK
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1253 AM CDT SAT MAY 23 2026
VALID 241200Z - 251200Z
..THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM CENTRAL
NEBRASKA INTO SOUTHWEST MINNESOTA...
..SUMMARY...
WIDELY SCATTERED THUNDERSTORM ACTIVITY WILL BE POSSIBLE FROM THE
SOUTHERN/CENTRAL PLAINS TO THE SOUTHEASTERN US INTO THE LOWER OHIO
VALLEY. A FEW STRONGER STORMS MAY BE POSSIBLE FROM CENTRAL NEBRASKA
INTO SOUTHWEST MINNESOTA.
..SYNOPSIS...
WIDELY SCATTERED AFTERNOON THUNDERSTORMS ARE LIKELY SOUTH OF A
STATIONARY FRONT EXTENDING FROM THE SOUTHERN PLAINS INTO THE LOWER
OHIO VALLEY. A FEW ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE ACROSS
THE SOUTHERN HIGH PLAINS WITHIN THE EASTERLY UPSLOPE REGIME. A WEAK
SHORTWAVE TROUGH WILL MOVE ACROSS THE CENTRAL/NORTHERN PLAINS INTO
THE UPPER MIDWEST ON D2/SUNDAY, WHICH MAY BE A FOCUS OF THUNDERSTORM
DEVELOPMENT ACROSS PORTIONS OF NEBRASKA INTO MINNESOTA. LARGE HAIL
AND DAMAGING WIND WILL BE THE PRIMARY THREAT WITH THESE STORMS.
..NEBRASKA INTO MINNESOTA...
A PLUME OF MID 50S TO 60S DEW POINTS WILL ADVECT NORTHWARD INTO
PORTIONS OF EASTERN NEBRASKA INTO SOUTHERN MINNESOTA SUNDAY
AFTERNOON AMID INCREASING SOUTHERLY FLOW ACROSS THE CENTRAL/NORTHERN
PLAINS. A WEAK SHORTWAVE WILL MOVE EASTWARD ACROSS THIS AREA WITH
THUNDERSTORM DEVELOPMENT LIKELY BY THE AFTERNOON. FORECAST SOUNDINGS
SUGGEST THAT DEEP LAYER SHEAR WILL BE SUFFICIENT TO SUPPORT
SUPERCELLS, WITH AROUND 40 KTS IN THE 0-6 KM LAYER. IN ADDITION TO
THE INCREASE IN MOISTURE, STEEP LOW TO MID-LEVEL LAPSE RATES WILL
ALSO OVERSPREAD THE AREA. THIS, IN COMBINATION WITH STRONG DEEP
LAYER SHEAR, WILL FAVOR POTENTIAL FOR LARGE HAIL (ISOLATED VERY
LARGE HAIL UP TO 2" IN DIAMETER). WELL MIXED PROFILES MAY ALSO
SUPPORT A FEW INSTANCES OF STRONG TO SEVERE WIND.
.THORNTON.. 05/23/2026
READ MORE
========================================
SPC MAY 23, 2026 0730 UTC DAY 3 SEVERE THUNDERSTORM OUTLOOK
SPC 0730Z DAY 3 OUTLOOK
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0217 AM CDT SAT MAY 23 2026
VALID 251200Z - 261200Z
..NO SEVERE THUNDERSTORM AREAS FORECAST...
..SUMMARY...
SCATTERED THUNDERSTORMS WILL BE POSSIBLE FROM PORTIONS OF THE
SOUTHWEST TO THE CENTRAL/SOUTHERN HIGH PLAINS AND ACROSS THE
SOUTHERN OHIO VALLEY AND THE SOUTHEAST. ADDITIONAL SHOWER AND
THUNDERSTORM ACTIVITY WILL BE POSSIBLE ACROSS THE PACIFIC NORTHWEST.
SEVERE STORMS ARE GENERALLY NOT EXPECTED.
ON D3/MONDAY, GUIDANCE SUGGESTS THAT HEIGHT RISES WILL BEGIN ACROSS
THE CENTRAL US AS A HIGH AMPLITUDE RIDGE BUILDS IN FROM THE WEST. AN
UPPER LEVEL LOW WILL BEGIN TO DEEPEN AND MOVE INLAND ACROSS THE
PACIFIC NORTHWEST THROUGH THE PERIOD. THOUGH INSTABILITY WILL BE
MINIMAL, COOLING TEMPERATURES ALOFT WITH THE UPPER LOW MAY PROMOTE A
FEW THUNDERSTORMS TOWARDS THE END OF THE PERIOD.
SLOW MOISTURE RETURN WILL CONTINUE ACROSS MUCH OF THE PLAINS INTO
THE MIDWEST, WITH AREAS OF WIDELY SCATTERED AREAS OF THUNDERSTORMS
POSSIBLE ACROSS PORTIONS OF THE SOUTHWEST TO THE SOUTHERN/CENTRAL
HIGH PLAINS AND FROM THE SOUTHERN OHIO VALLEY INTO THE SOUTHEAST. A
FEW STRONG TO MARGINALLY SEVERE STORMS WILL BE POSSIBLE FROM THE
PLAINS TO THE SOUTHEAST WHERE BETTER INSTABILITY RESIDES, BUT
GENERALLY WEAK FLOW AND SUBSIDENCE ALOFT WILL KEEP ORGANIZED STORM
POTENTIAL LOW.
.THORNTON.. 05/23/2026
READ MORE
========================================
SPC MAY 23, 2026 DAY 4-8 SEVERE WEATHER OUTLOOK
DAY 4-8 OUTLOOK
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0353 AM CDT SAT MAY 23 2026
VALID 261200Z - 311200Z
..DISCUSSION...
A TROUGH WILL DEEPEN AND SHIFT EASTWARD ACROSS THE PACIFIC NORTHWEST
D4/TUESDAY-D5/WEDNESDAY. AS THE UPPER LOW SLOWLY SHIFTS EASTWARD,
STRONGER FLOW WILL OVERSPREAD THE INTERMOUNTAIN WEST INTO THE
NORTHERN ROCKIES WHICH WILL RESULT IN STRENGTHENING LEE TROUGHING
ACROSS THE CENTRAL/NORTHERN PLAINS. MOISTURE ADVECTION WILL SPREAD
NORTHWARD WITH THE STRENGTHENING SOUTHERLY FLOW ACROSS THE
CENTRAL/NORTHERN PLAINS. SEVERE STORMS MAY OCCUR EACH DAY ACROSS
SOME PORTION OF THE NORTHERN AND NORTHERN/CENTRAL HIGH PLAINS. IN
ADDITION, STRENGTHENING SOUTHERN STREAM FLOW MAY BRING STRONGER
STORMS ACROSS THE SIERRA MADRE WHICH MAY BRING SEVERE POTENTIAL INTO
PORTIONS OF FAR SOUTHERN TEXAS. FOR NOW, CONFIDENCE IN EXACT
CORRIDORS OF GREATER SEVERE POTENTIAL REMAINS LOW.
BY D6/THURSDAY-D8/SATURDAY, GUIDANCE SUGGESTS THE WESTERN LOW
BECOMES CUT OFF AND SLOWLY WOBBLES TOWARDS THE GREAT BASIN BEFORE
BECOMING ABSORBED BACK INTO THE NORTHERN STREAM, LIKELY DUE TO THE
HIGH AMPLITUDE RIDGING ACROSS THE CENTRAL. SOME SEVERE POTENTIAL MAY
EXTEND INTO THE EASTERN US AS A COLD FRONT SHIFTS SOUTHWARD AS FLOW
ENHANCES IN THE TROUGH ACROSS QUEBEC IN THE D6-D7 PERIOD.
READ MORE
========================================
SPC DAY 1 FIRE WEATHER OUTLOOK
SPC DAY 1 FIRE WEATHER OUTLOOK
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1251 AM CDT SAT MAY 23 2026
VALID 231200Z - 241200Z
..NO CRITICAL AREAS...
..SYNOPSIS...
UPPER-LEVEL TROUGHING WILL PERSIST ACROSS THE NORTHERN GREAT PLAINS
AND MIDWEST TODAY, WITH RIDGING IN PLACE ACROSS MUCH OF THE
SOUTHEAST/EAST COAST. UPPER-LEVEL RIDGING WILL ALSO GRADUALLY BUILD
ACROSS MUCH OF THE WESTERN CONUS THROUGH THE PERIOD. AT THE SURFACE,
A SERIES OF FRONTAL SYSTEMS WILL PROGRESS ACROSS THE GREAT PLAINS
AND EASTERN CONUS, WITH SEVERAL MID-LEVEL PERTURBATIONS PROMOTING
THE POTENTIAL FOR WETTING RAINFALL ACROSS MUCH OF THE SOUTHERN
PLAINS AND EASTERN US.
WARMING TEMPERATURES UNDER THE GRADUALLY BUILDING RIDGE WILL SUPPORT
RH REDUCTIONS TO 10-20% ACROSS MUCH OF THE SOUTHWEST AND PORTIONS OF
THE GREAT BASIN THIS AFTERNOON. WEAK SURFACE PRESSURE GRADIENT
MAGNITUDES AND, SUBSEQUENTLY, GENERALLY LIGHT SURFACE WINDS WILL
LARGELY TEMPER BROAD FIRE WEATHER CONCERNS ACROSS THE REGION.
SUSTAINED WESTERLY/SOUTHWESTERLY WINDS OF 10-15 MPH MAY PROMOTE
LOCALLY ELEVATED FIRE WEATHER CONCERNS IN FAVORED GAP/TERRAIN AREAS,
HOWEVER.
MID-LEVEL MOISTURE ATOP DEEP, WELL-MIXED BOUNDARY LAYER PROFILES MAY
SUPPORT WEAK BUOYANCY AND ISOLATED HIGH-BASED CONVECTION OVER HIGHER
TERRAIN ACROSS PORTIONS OF THE WESTERN GREAT BASIN INTO FAR
NORTHEASTERN CALIFORNIA AND SOUTHERN OREGON THIS AFTERNOON.
GENERALLY LIMITED LIGHTNING POTENTIAL AND SUB-CRITICAL FUELS SHOULD
TEMPER THE OVERALL LIGHTNING IGNITION THREAT, HOWEVER.
.CHALMERS.. 05/23/2026
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
READ MORE
========================================
SPC DAY 2 FIRE WEATHER OUTLOOK
SPC DAY 2 FIRE WEATHER OUTLOOK
DAY 2 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1252 AM CDT SAT MAY 23 2026
VALID 241200Z - 251200Z
..NO CRITICAL AREAS...
..SYNOPSIS...
UPPER-LEVEL TROUGHING WILL SHIFT EASTWARD ACROSS THE NORTHERN GREAT
LAKES REGION ON D2/SUNDAY, WITH SUBTLE/WEAK TROUGHING ALSO IN PLACE
ACROSS THE SOUTHERN PLAINS. UPPER-LEVEL RIDGING WILL LINGER OVER THE
SOUTHEAST AND FOUR CORNERS REGIONS. A POTENT UPPER-LEVEL TROUGH WILL
THEN APPROACH THE PACIFIC NORTHWEST BY THE END OF THE PERIOD, WITH
WEAK TROUGHING ALSO MOVING ONSHORE ACROSS SOUTHERN
CALIFORNIA/NORTHWESTERN MEXICO. AT THE SURFACE, A QUASI-STATIONARY
SURFACE BOUNDARY WILL EXTEND FROM THE SOUTHERN PLAINS INTO THE OHIO
VALLEY AND MID-ATLANTIC, WITH CHANCES FOR WETTING RAINFALL AND
THUNDERSTORMS ACROSS MUCH OF THE SOUTH AND EASTERN CONUS.
SIMILAR TO D1/SATURDAY, WARMING TEMPERATURES UNDER SUBTLE RIDGING
WILL PROMOTE RH REDUCTIONS TO 10-20% ACROSS MUCH OF THE WEST AND
INTO THE NORTHERN HIGH PLAINS SUNDAY AFTERNOON. THE LACK OF A
STRONGER SURFACE PRESSURE GRADIENT WILL LARGELY LIMIT SUSTAINED
SURFACE WIND SPEEDS AND THUS LIMIT BROAD FIRE WEATHER CONCERNS.
LOCALLY ELEVATED FIRE WEATHER CONDITIONS WILL BE POSSIBLE IN FAVORED
TERRAIN/GAP AREAS, HOWEVER. LOCALLY ELEVATED CONDITIONS MAY ALSO BE
POSSIBLE ACROSS PORTIONS OF NORTHERN MONTANA, ESPECIALLY WHERE ANY
POCKETS OF DRIER FINE FUELS MAY EXIST, WHERE A TIGHTENED SURFACE
PRESSURE GRADIENT ON THE SOUTHERN PERIPHERY OF A SURFACE LOW MAY
SUPPORT A BRIEF OVERLAP OF SUSTAINED WESTERLY SURFACE WINDS OF 10-15
MPH AND RH VALUES OF 20-25%.
LINGERING MID-LEVEL MOISTURE AND WELL-MIXED BOUNDARY LAYER PROFILES
AHEAD OF A SUBTLE MID-LEVEL PERTURBATION MAY SUPPORT ISOLATED
HIGH-BASED CONVECTION ACROSS HIGHER-TERRAIN AREAS OF THE NORTHERN
GREAT BASIN SUNDAY AFTERNOON. LIMITED LIGHTNING POTENTIAL AND
SUB-CRITICAL FUELS ARE AGAIN EXPECTED TO TEMPER THE OVERALL
LIGHTNING IGNITION THREAT AT THIS TIME, HOWEVER.
.CHALMERS.. 05/23/2026
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT...
READ MORE
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