Alert archive / Missouri / Heat Advisories in 2015

Heat Advisory 6, NWS St. Louis, MO

July 26, 201524 counties in Missouri; 17 counties in Illinois

NWS St. Louis, MO issued this heat advisory at Jul 26, 2015, 3:55 PM CDT for 24 counties in Missouri; 17 counties in Illinois. It took effect at Jul 27, 2015, 12:00 PM CDT. It was in force for 33 hr.

The area

The counties it named.

The facts

Issued
Jul 26, 2015, 3:55 PM CDT (20:55 UTC)
In effect from
Jul 27, 2015, 12:00 PM CDT
Expired
Jul 28, 2015, 9:00 PM CDT
In force
33 hr
Issued by
NWS St. Louis, MO
All 41 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 15 km from the middle of the area, began a volume at 20:55 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

Lincoln, IL (KILX), launched 12:00Z, 8.9 hours before the alert went out and 229 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2015-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 708 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2015-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
708 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
939 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this heat advisory went out at Jul 26, 3:31 PM CDT, 24 minutes earlier.

Area forecast discussion, Jul 26, 3:31 PM CDT, 24 minutes before
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Hazardous weather outlook, Jul 26, 6:02 AM CDT, 9 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
602 AM CDT SUN JUL 26 2015

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-271115-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
602 AM CDT SUN JUL 26 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TODAY AND TONIGHT

SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED ACROSS THE REGION
TODAY. SOME OF THESE STORMS WILL BE STRONG...WITH THE MOST
INTENSE STORMS PRODUCING STRONG WINDS AND POSSIBLY HAIL.

IN ADDITION...SOME OF THE STORMS WILL PRODUCE HEAVY
RAIN...ESPECIALLY OVER PARTS OF NORTHEAST AND CENTRAL MISSOURI AND
WEST CENTRAL ILLINOIS THIS MORNING. BECAUSE OF THIS CONTINUED
THREAT...THE FLASH FLOOD WATCH FOR THESE AREAS HAS BEEN EXTENDED
UNTIL MIDDAY.

THE RETURN OF AFTERNOON SUNSHINE ACROSS PARTS OF MID MISSOURI
WILL PUSH THE HEAT INDEX TO AROUND 105 DEGREES...AND A HEAT
ADVISORY IS IN EFFECT FOR THIS AREA FROM NOON UNTIL 7PM.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS FOR MONDAY THROUGH
TUESDAY NIGHT....PRIMARILY ALONG AND EAST OF THE MISSISSIPPI
RIVER. A COLD FRONT WILL MOVE THROUGH THE REGION WEDNESDAY
BRINGING A CHANCE FOR STORMS TO MUCH OF THE AREA.

HEAT INDEX READINGS OF 100 TO 105 WILL BE POSSIBLE ACROSS MUCH OF
THE AREA ON MONDAY...WITH READINGS POSSIBLY REACHING 110 DEGREES
IN A FEW LOCATIONS ON TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TODAY. SPOTTERS ARE REQUESTED TO
REPORT ANY RAINFALLS OF AN INCH OR MORE.

TRUETT

In the hours before

Special weather statement, Jul 26, 10:15 AM CDT, 5 hours 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1015 AM CDT SUN JUL 26 2015

MOZ035-036-261600-
PIKE MO-RALLS MO-
1015 AM CDT SUN JUL 26 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN RALLS AND NORTHWESTERN
PIKE COUNTIES IN NORTHEASTERN MISSOURI UNTIL 1100 AM CDT...

AT 1015 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR SPAULDING...MOVING EAST AT 30 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
NEW LONDON...CENTER...FRANKFORD...RENSSELAER...SPAULDING...
SPENCERBURG AND THE LANDING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3960 9118 3937 9125 3951 9171 3953 9171
      3968 9166
TIME...MOT...LOC 1515Z 286DEG 25KT 3958 9160

BYRD

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 26, 2:10 AM CDTSpecial Weather StatementLSXBoone, Moniteau50 min
Jul 26, 2:54 AM CDTSpecial Weather StatementLSXCallaway, Cole, Moniteau, Osage51 min
Jul 26, 3:24 AM CDTFlash Flood WarningLSXShelby6 hr
Jul 26, 4:23 AM CDTSpecial Weather StatementLSXFranklin, Lincoln, Saint Charles, Saint Louis, Warren52 min
Jul 26, 10:15 AM CDTSpecial Weather StatementLSXRalls45 min
Jul 26, 12:14 PM CDTRiver Flood WarningLSXMarion28 hr
Jul 26, 1:12 PM CDTRiver Flood WarningLSXMarion35 hr
Jul 26, 2:41 PM CDTSevere Thunderstorm WarningLSXCrawford34 min
Jul 26, 4:45 AM CDTFlash Flood WarningLSXPike6 hr
Jul 26, 5:03 AM CDTFlash Flood WarningLSXAdams5 hr

Nearby

Heat Advisories in Missouri, 2015Heat Advisories in Illinois, 2015Every heat advisory in 2015

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.